2010 Cadillac Truck SRX FWD V6-3.0L Page 1203

2010 Cadillac Truck SRX FWD V6-3.0L Page 1203

Typical Scan Tool Data

Circuit/System Description

The heated oxygen sensors (HO2S) are used for fuel control and catalyst monitoring. Each HO2S compares the oxygen content of the surrounding

air with the oxygen content of the exhaust stream. When the engine is started, the control module operates in an Open Loop mode, ignoring the

HO2S signal voltage while calculating the air-to-fuel ratio. While the engine runs, the HO2S heats up and begins to generate a voltage within a

range of 0-1,275 mV. Once sufficient HO2S voltage fluctuation is observed by the control module, Closed Loop is entered. The control module

uses the HO2S voltage to determine the air-to-fuel ratio. An HO2S voltage that increases toward 1,000 mV indicates a rich fuel mixture. An HO2S

voltage that decreases toward 0 mV indicates a lean fuel mixture.

The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed

Loop earlier and the control module to calculate the air-to-fuel ratio sooner.

Conditions for Running the DTC

P0131, P0137, P0151, or P0157

* DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128,

P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516,

P2101, P2119, P2135, P2176 are not set.

* The engine is operating in Closed Loop.

* The Ignition 1 voltage is between 10-32 V.

* The fuel level is greater than 10 %.

* The throttle position (TP) is between 3-70 %.

* The DTCs run continuously when the above conditions are met for 2 s.

P0132, P0138, P0152, or P0158

* DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128,

P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516,

P2101, P2119, P2135, P2176 are not set.

* The engine is operating in Closed Loop.

* The Ignition 1 voltage is between 10-32 V.

* The fuel level is greater than 10 %.

* The throttle position (TP) is between 0-70 %.

* The DTCs run continuously when the above conditions are met for 3 s.

2010 Cadillac Truck SRX FWD V6-3.0L Page 1181

2010 Cadillac Truck SRX FWD V6-3.0L Page 1181

Typical Scan Tool Data

Circuit/System Description

Heated oxygen sensors (HO2S) are used for fuel control and post catalyst monitoring. Each HO2S compares the oxygen content of the surrounding

air with the oxygen content in the exhaust stream. The HO2S must reach operating temperature to provide an accurate voltage signal. A heating

element inside the HO2S minimizes the time required for the sensors to reach operating temperature. Voltage is provided to the heater by an

ignition voltage circuit through a fuse. With the engine running, ground is provided to the heater by the HO2S heater low control circuit through a

low side driver within the engine control module (ECM). The ECM uses pulse width modulation (PWM) to control the HO2S heater operation to

maintain a specific HO2S operating temperature range.

Conditions for Running the DTC

P0030, P0036, P0050, or P0056

* The ignition 1 voltage is between 11-18 V.

* The engine speed is greater than 400 RPM.

* The DTCs run continuously when the above conditions are met.

P0053, P0054, P0059, or P0060

* DTCs P0112, P0113, P0117, P0118, or P2610 are not set.

* The engine run time is greater than 20 s.

* The ignition voltage is less than 18 V.

* The ignition is OFF for greater than 8 h.

* The engine coolant temperature (ECT) is between -30 to +45掳C (-22 to +113掳F) at engine start-up.

* The ECT and the intake air temperature (IAT) are within 8掳C (14掳F) at engine start-up.

* The DTCs run once per drive cycle when the above conditions are met.

P0135, P0141, P0155, or P0161

* DTCs P0116, P0117, P0118, P0125, or P0128 are not set.

* The ignition 1 voltage is between 10-32 V.

* The HO2S is at operating temperature.

* The HO2S is commanded ON.

* The DTCs run once per drive cycle when the above conditions are met for 120 s.

2010 Cadillac Truck SRX FWD V6-3.0L Page 933

2010 Cadillac Truck SRX FWD V6-3.0L Page 933

Typical Scan Tool Data

Circuit/System Description

The heated oxygen sensors (HO2S) are used for fuel control and catalyst monitoring. Each HO2S compares the oxygen content of the surrounding

air with the oxygen content of the exhaust stream. When the engine is started, the control module operates in an Open Loop mode, ignoring the

HO2S signal voltage while calculating the air-to-fuel ratio. While the engine runs, the HO2S heats up and begins to generate a voltage within a

range of 0-1,275 mV. Once sufficient HO2S voltage fluctuation is observed by the control module, Closed Loop is entered. The control module

uses the HO2S voltage to determine the air-to-fuel ratio. An HO2S voltage that increases toward 1,000 mV indicates a rich fuel mixture. An HO2S

voltage that decreases toward 0 mV indicates a lean fuel mixture.

The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed

Loop earlier and the control module to calculate the air-to-fuel ratio sooner.

Conditions for Running the DTC

P0131, P0137, P0151, or P0157

* DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128,

P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516,

P2101, P2119, P2135, P2176 are not set.

* The engine is operating in Closed Loop.

* The Ignition 1 voltage is between 10-32 V.

* The fuel level is greater than 10 %.

* The throttle position (TP) is between 3-70 %.

* The DTCs run continuously when the above conditions are met for 2 s.

P0132, P0138, P0152, or P0158

* DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128,

P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516,

P2101, P2119, P2135, P2176 are not set.

* The engine is operating in Closed Loop.

* The Ignition 1 voltage is between 10-32 V.

* The fuel level is greater than 10 %.

* The throttle position (TP) is between 0-70 %.

* The DTCs run continuously when the above conditions are met for 3 s.

2010 Cadillac Truck SRX FWD V6-3.0L Page 1048

2010 Cadillac Truck SRX FWD V6-3.0L Page 1048

Typical Scan Tool Data

Circuit/System Description

Heated oxygen sensors (HO2S) are used for fuel control and post catalyst monitoring. Each HO2S compares the oxygen content of the surrounding

air with the oxygen content in the exhaust stream. The HO2S must reach operating temperature to provide an accurate voltage signal. A heating

element inside the HO2S minimizes the time required for the sensors to reach operating temperature. Voltage is provided to the heater by an

ignition voltage circuit through a fuse. With the engine running, ground is provided to the heater by the HO2S heater low control circuit through a

low side driver within the engine control module (ECM). The ECM uses pulse width modulation (PWM) to control the HO2S heater operation to

maintain a specific HO2S operating temperature range.

Conditions for Running the DTC

P0030, P0036, P0050, or P0056

* The ignition 1 voltage is between 11-18 V.

* The engine speed is greater than 400 RPM.

* The DTCs run continuously when the above conditions are met.

P0053, P0054, P0059, or P0060

* DTCs P0112, P0113, P0117, P0118, or P2610 are not set.

* The engine run time is greater than 20 s.

* The ignition voltage is less than 18 V.

* The ignition is OFF for greater than 8 h.

* The engine coolant temperature (ECT) is between -30 to +45掳C (-22 to +113掳F) at engine start-up.

* The ECT and the intake air temperature (IAT) are within 8掳C (14掳F) at engine start-up.

* The DTCs run once per drive cycle when the above conditions are met.

P0135, P0141, P0155, or P0161

* DTCs P0116, P0117, P0118, P0125, or P0128 are not set.

* The ignition 1 voltage is between 10-32 V.

* The HO2S is at operating temperature.

* The HO2S is commanded ON.

* The DTCs run once per drive cycle when the above conditions are met for 120 s.

2010 Cadillac Truck SRX FWD V6-3.0L Page 1224

2010 Cadillac Truck SRX FWD V6-3.0L Page 1224

Typical Scan Tool Data

Circuit/System Description

The heated oxygen sensors (HO2S) are used for fuel control and catalyst monitoring. Each HO2S compares the oxygen content of the surrounding

air with the oxygen content of the exhaust stream. When the engine is started, the control module operates in an Open Loop mode, ignoring the

HO2S signal voltage while calculating the air-to-fuel ratio. While the engine runs, the HO2S heats up and begins to generate a voltage within a

range of 0-1,275 mV. Once sufficient HO2S voltage fluctuation is observed by the control module, Closed Loop is entered. The control module

uses the HO2S voltage to determine the air-to-fuel ratio. An HO2S voltage that increases toward 1,000 mV indicates a rich fuel mixture. An HO2S

voltage that decreases toward 0 mV indicates a lean fuel mixture.

The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed

Loop earlier and the control module to calculate the air-to-fuel ratio sooner.

Conditions for Running the DTC

P0131, P0137, P0151, or P0157

* DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128,

P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516,

P2101, P2119, P2135, P2176 are not set.

* The engine is operating in Closed Loop.

* The Ignition 1 voltage is between 10-32 V.

* The fuel level is greater than 10 %.

* The throttle position (TP) is between 3-70 %.

* The DTCs run continuously when the above conditions are met for 2 s.

P0132, P0138, P0152, or P0158

* DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128,

P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516,

P2101, P2119, P2135, P2176 are not set.

* The engine is operating in Closed Loop.

* The Ignition 1 voltage is between 10-32 V.

* The fuel level is greater than 10 %.

* The throttle position (TP) is between 0-70 %.

* The DTCs run continuously when the above conditions are met for 3 s.

2010 Cadillac Truck SRX FWD V6-3.0L Page 1217

2010 Cadillac Truck SRX FWD V6-3.0L Page 1217

Typical Scan Tool Data

Circuit/System Description

Heated oxygen sensors (HO2S) are used for fuel control and post catalyst monitoring. Each HO2S compares the oxygen content of the surrounding

air with the oxygen content in the exhaust stream. The HO2S must reach operating temperature to provide an accurate voltage signal. A heating

element inside the HO2S minimizes the time required for the sensors to reach operating temperature. Voltage is provided to the heater by an

ignition voltage circuit through a fuse. With the engine running, ground is provided to the heater by the HO2S heater low control circuit through a

low side driver within the engine control module (ECM). The ECM uses pulse width modulation (PWM) to control the HO2S heater operation to

maintain a specific HO2S operating temperature range.

Conditions for Running the DTC

P0030, P0036, P0050, or P0056

* The ignition 1 voltage is between 11-18 V.

* The engine speed is greater than 400 RPM.

* The DTCs run continuously when the above conditions are met.

P0053, P0054, P0059, or P0060

* DTCs P0112, P0113, P0117, P0118, or P2610 are not set.

* The engine run time is greater than 20 s.

* The ignition voltage is less than 18 V.

* The ignition is OFF for greater than 8 h.

* The engine coolant temperature (ECT) is between -30 to +45掳C (-22 to +113掳F) at engine start-up.

* The ECT and the intake air temperature (IAT) are within 8掳C (14掳F) at engine start-up.

* The DTCs run once per drive cycle when the above conditions are met.

P0135, P0141, P0155, or P0161

* DTCs P0116, P0117, P0118, P0125, or P0128 are not set.

* The ignition 1 voltage is between 10-32 V.

* The HO2S is at operating temperature.

* The HO2S is commanded ON.

* The DTCs run once per drive cycle when the above conditions are met for 120 s.

2010 Cadillac Truck SRX FWD V6-3.0L Page 1121

2010 Cadillac Truck SRX FWD V6-3.0L Page 1121

Typical Scan Tool Data

Circuit Description

The intake flow rationality diagnostic provides the within-range rationality check for the mass air flow (MAF), manifold absolute pressure (MAP),

and the throttle position sensors. This is an explicit model-based diagnostic containing 4 separate models for the intake system.

* The throttle model describes the flow through the throttle body and is used to estimate the MAF through the throttle body as a function of

barometric pressure (BARO), throttle position, intake air temperature (IAT), and estimated MAP. The information from this model is

displayed on the scan tool as the MAF Performance Test parameter.

* The first intake manifold model describes the intake manifold and is used to estimate MAP as a function of the MAF into the manifold from

the throttle body and the MAF out of the manifold caused by engine pumping. The flow into the manifold from the throttle uses the MAF

estimate calculated from the above throttle model. The information from this model is displayed on the scan tool as the MAP Performance

Test 1 parameter.

* The second intake manifold model is identical to the first intake manifold model except that the MAF sensor measurement is used instead of

the throttle model estimate for the throttle air input. The information from this model is displayed on the scan tool as the MAP Performance

Test 2 parameter.

* The fourth model is created from the combination and additional calculations of the throttle model and the first intake manifold model. The

information from this model is displayed on the scan tool as the Throttle Position Performance Test parameter.

The estimates of MAF and MAP obtained from this system of models and calculations are then compared to the actual measured values from the

MAF, MAP, and the throttle position sensors and to each other to determine the appropriate DTC to fail. The following table illustrates the possible

failure combinations and the resulting DTC or DTCs.

Conditions for Running the DTC

* DTC P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0128, P0335 or P0336 is not set.

* The engine speed is between 400-7,000 RPM.

* The IAT Sensor parameter is between -20掳 to +125掳C (-4掳 to +257掳F).

* The ECT Sensor parameter is between 69-127掳C (156-260掳F).

* This DTC runs continuously within the enabling conditions.

Conditions for Setting the DTCs

The engine control module (ECM) detects that the actual measured airflow from MAF, MAP, and throttle position is not within range of the

2010 Cadillac Truck SRX FWD V6-3.0L Page 1382

2010 Cadillac Truck SRX FWD V6-3.0L Page 1382

Typical Scan Tool Data

Circuit Description

The boost pressure sensor is integrated with the intake air temperature (IAT) sensor. The boost pressure sensor measures the range of pressures

between the turbocharger and the throttle body. Pressure in this portion of the induction system is affected by the following:

* Engine speed

* Throttle opening

* Turbocharger boost pressure

* Intake air temperature (IAT)

* Barometric pressure (BARO)

* Efficiency of the charge air cooler

The sensor provides a signal voltage to the engine control module (ECM), relative to the pressure changes, on the boost pressure sensor signal

circuit. Under normal operation the greatest pressure that can exist in this portion of the induction system at ignition ON, engine OFF is equal to the

BARO. When the vehicle is operated at wide-open throttle (WOT) the turbocharger can increase the pressure to near 240 kPa (35 psi). The least

pressure that occurs is when the vehicle is idling or decelerating, and it is equal to the BARO.

Conditions for Running the DTCs

P0234

* The BARO is greater than 66 kPa (9.6 psi).

* The engine speed is between 2,000-3,720 RPM.

* The driver requested boost pressure level exceeds the level of the base boost pressure for more than 1 s.

* This DTC runs continuously within the enabling conditions.

P0299

* The BARO is greater than 66 kPa (9.6 psi).

* The engine speed is between 2,000-3,720 RPM.

* The driver requested boost pressure level exceeds the level of the base boost pressure for more than 6 s.

* This DTC runs continuously within the enabling conditions.

Conditions for Setting the DTC

P0234

The ECM detects that the actual boost pressure is 22-147 kPa (3.2-21.3 psi) greater than the desired boost pressure for greater than 1 s.

P0299

The ECM detects that the actual boost pressure is at least 27 kPa (3.9 psi) less than the desired boost pressure.

Action Taken When the DTC Sets

DTCs P0234 and P0299 are Type B DTCs.

Conditions for Clearing the MIL/DTC

2010 Cadillac Truck SRX FWD V6-3.0L Page 1858

2010 Cadillac Truck SRX FWD V6-3.0L Page 1858

Typical Scan Tool Data

Circuit/System Description

Shift solenoid valve 1 is installed on the middle valve body. The solenoid turns ON and OFF in response to signals output from the TCM.

According to the ON or OFF status of shift solenoid valve 1 or shift solenoid valve 2, the 1st gear engine brake operates or the gear shifts into

change. As a fail-safe function, if any shift solenoid abnormality occurs, the transmission control module (TCM) will disable the current to the

solenoids.

Conditions for Running the DTC

P0985

* The ignition voltage is 10.2-15.5 V.

* The engine speed is greater than 400 RPM for 2 s.

* The transmission is not in emergency mode.

* 10 ms after solenoid output changed.

P0986

* The ignition voltage is 10.2-15.5 V.

* The engine speed is greater than 400 RPM for 2 s.

* The transmission is not in emergency mode.

* 10 ms after solenoid output changed.

Conditions for Setting the DTC

P0985

The TCM detects an ON signal (12 V) of the shift solenoid valve 1 circuit when the shift solenoid valve 1 is commanded OFF (0 V) for 100 ms

continuously after 5 times.

P0986

The TCM detects an OFF signal (0 V) of the shift solenoid valve 1 circuit when the shift solenoid valve 1 is commanded ON (12 V) for 100 ms

continuously after 5 times.

Action Taken When the DTC Sets

* DTCs P0985 and P0986 are Type A DTCs.

* The TCM freezes transmission adaptive functions.

* The TCM turns OFF all solenoids.

* The TCM allows the vehicle to operate only in the second gear and "R" range after a stop.

Conditions for Clearing the DTC

* DTCs P0985 and P0986 are Type A DTCs.

* The TCM detects an ON signal (12 V) of the shift solenoid valve 1 circuit when the shift solenoid valve 1 is commanded ON (12 V) for 1 s

continuously.

* The TCM detects an OFF signal (0 V) of the 1 circuit when the shift solenoid valve 1 is commanded OFF (0 V) for 1 s continuously.

Diagnostic Aids

When attempting to set solenoid electrical DTCs, ensure the control solenoid valve assembly is warmed up and the transmission is operated long

enough to ensure a 3掳C (5掳F) increase in temperature. This will place the TCM in the optimal conditions to test solenoid electrical DTCs.

2010 Cadillac Truck SRX FWD V6-3.0L Page 1527

2010 Cadillac Truck SRX FWD V6-3.0L Page 1527

Typical Scan Tool Data

Circuit/System Description

The engine cooling fan system is composed of one cooling fan, a series of 5 relays, the engine control module (ECM), and the associated wiring.

The cooling fan assembly includes two individual resistors mounted to each side of the cooling fan shroud. This combination of components

enables the ECM to operate the cooling fan at 3 speeds using two fan control circuits.

To operate the fan, the ECM activates the applicable relay by grounding the control circuit with a solid state device called a driver. The driver is

equipped with a feedback circuit. The ECM can determine if the control circuit is open, shorted to ground, or shorted to a voltage by monitoring the

feedback voltage.

Conditions for Running the DTC

2010 Cadillac Truck SRX FWD V6-3.0L Page 1195

2010 Cadillac Truck SRX FWD V6-3.0L Page 1195

Typical Scan Tool Data

Circuit/System Description

The heated oxygen sensors (HO2S) are used for fuel control and catalyst monitoring. Each HO2S compares the oxygen content of the surrounding

air with the oxygen content of the exhaust stream. When the engine is started, the control module operates in an Open Loop mode, ignoring the

HO2S signal voltage while calculating the air-to-fuel ratio. While the engine runs, the HO2S heats up and begins to generate a voltage within a

range of 0-1,275 mV. Once sufficient HO2S voltage fluctuation is observed by the control module, Closed Loop is entered. The control module

uses the HO2S voltage to determine the air-to-fuel ratio. An HO2S voltage that increases toward 1,000 mV indicates a rich fuel mixture. An HO2S

voltage that decreases toward 0 mV indicates a lean fuel mixture.

The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed

Loop earlier and the control module to calculate the air-to-fuel ratio sooner.

Conditions for Running the DTC

* DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128,

P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516,

P2101, P2119, P2135, P2176 are not set.

* The ignition 1 voltage is between 10-32 V.

* The engine run time is greater than 150 s.

* The fuel system is in Closed Loop.

* The DTCs run continuously when the above conditions are met.

Conditions for Setting the DTC

P0134 or P0154

* The ECM detects that the HO2S 1 voltage is between 350-550 mV.

* The HO2S heater warm-up cycle is complete.

* The DTCs set within 15 s when the above conditions are met.

P0140 or P0160

* The ECM detects that the HO2S 2 voltage is not varying.

* The HO2S heater warm-up cycle is complete.

* The DTCs set within 15 s when the above conditions are met.

2010 Cadillac Truck SRX FWD V6-3.0L Page 2137

2010 Cadillac Truck SRX FWD V6-3.0L Page 2137

Typical Scan Tool Data

Circuit/System Description

Based on input speed and output speed signals, signals from the engine control module (engine speed and throttle opening) and vehicle speed,

smooth lock-up control and slip is performed through the lock-up control solenoid (SLU). The SLU is linearly turned ON and OFF. The lock-up

clutch inside the torque converter is operated, and the pump impeller and turbine runner are connected. Through this, the engine and the automatic

transmission are coupled and engine output is connected directly to the automatic transmission, eliminating transmission loss. By sliding the

lock-up clutch when lock-up is in the OFF range, extends the lock-up range to low vehicle speeds. It also suppresses a rise in engine speed and

increases transmission efficiency, improving fuel economy and at the same time, through the sliding of the lockup clutch, engine vibration can be

absorbed by the torque converter.

Conditions for Running the DTC

P2759

* The ignition voltage is 10.2-15.5 V.

* The engine speed is greater than 400 RPM for 2 s.

* The transmission is not in emergency mode.

* Driving in D range.

* Transmission Control Module (TCM) communication is normal.

* DTCs P2763 and P2764 are not set.

P2762

* The ignition voltage is 10.2-15.5 V.

* The engine speed is greater than 400 RPM for 2 s.

* The transmission is not in emergency mode.

* Driving in D range.

* TCM communication is normal.

* The Automatic Transmission Fluid Temperature is more than 20掳C (68掳F).

* SLU current is more than 0.85 A.

* SLU current is not changed.

P2763

* The ignition voltage is 10.2-15.5 V.

* The engine speed is greater than 400 RPM for 2 s.

* The transmission is not in emergency mode.

* Driving in D range.

* TCM communication is normal.

* DTC P2764 is not set.

P2764

* The ignition voltage is 10.2-15.5 V.

* The engine speed is greater than 400 RPM for 2 s.

* The transmission is not in emergency mode.

* Driving in D range.

* TCM communication is normal.

* DTC P2763 is not set.

Conditions for Setting the DTC

P2759

Deviation between commanded current and feedback current

2010 Cadillac Truck SRX FWD V6-3.0L Page 2011

2010 Cadillac Truck SRX FWD V6-3.0L Page 2011

Typical Scan Tool Data

Circuit/System Description

The barometric pressure (BARO) sensor is integral to the throttle inlet absolute pressure sensor and responds to changes in altitude and atmospheric

conditions. This gives the ECM an indication of barometric pressure. The ECM uses this information to calculate fuel delivery. The BARO sensor

provides a voltage signal to the ECM relative to the atmospheric pressure changes. The ECM monitors the BARO sensor signal for a voltage

outside of the normal range.

Conditions for Running the DTC

P2227

* DTC P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0222, P0223, P1516,

P2135, P2228, or P2229 is not set.

* The engine is running.

OR

* DTC P0106, P0107, P0108, P2228, P2229, or P2230 is not set and not pending.

* Ignition ON, engine OFF

* DTC P2227 runs continuously when the above conditions are met.

P2228 or P2229

* The engine is running.

* The DTCs run continuously when the above condition is met.

P2230

* DTC P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0222, P0223, P1516,

P2135, P2228, or P2229 is not set.

* The engine is running.

* DTC P2230 runs continuously when the above conditions are met.

Conditions for Setting the DTC

P2227

* The engine is running.

* The ECM detects that the difference between the BARO signal and the calculated BARO is greater than 15 kPa (2.2 psi) if the vehicle has

traveled at most 0.5 km (0.31 mi) since the last calculated BARO update, or the ECM detects that the difference between the BARO signal

and the calculated BARO is greater than 25 kPa (3.6 psi) if the vehicle has traveled greater than 0.5 km (0.31 mi) since the last calculated

BARO update.

OR

* Ignition ON, engine OFF

* The ECM detects that the BARO pressure is less than 50 kPa (7.3 psi) or greater than 115 kPa (16.7 psi).

P2228

The ECM detects that the BARO sensor voltage is less than 1.95 V for greater than 4 s.

P2229

The ECM detects that the BARO sensor voltage is greater than 4.5 V for greater than 4 s.

P2230

The ECM detects that the difference between the current BARO sensor reading and the previous BARO sensor reading is greater than 10 kPa (1.5

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1061

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1061

Typical Scan Tool Data

Circuit Description

The heated oxygen sensors (HO2S) are used for fuel control and catalyst monitoring. Each HO2S compares the oxygen content of the surrounding

air with the oxygen content of the exhaust stream. When the engine is started, the control module operates in an Open Loop mode, ignoring the

HO2S signal voltage while calculating the air-to-fuel ratio. The control module supplies the HO2S with a reference, or bias voltage of about 450

mV. While the engine runs, the HO2S heats up and begins to generate a voltage within a range of 0-1,000 mV. This voltage will fluctuate above

and below the bias voltage. Once sufficient HO2S voltage fluctuation is observed by the control module, Closed Loop is entered. The control

module uses the HO2S voltage to determine the air-to-fuel ratio. An HO2S voltage that increases above bias voltage toward 1,000 mV indicates a

rich fuel mixture. An HO2S voltage that decreases below bias voltage toward 0 mV indicates a lean fuel mixture.

The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed

Loop earlier and the control module to calculate the air-to-fuel ratio sooner.

Conditions for Running the DTC

Condition 1

* DTC P0201, P0202, P0203, P0204, P0205, P0206 P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276,

P0277, P2146, P2149, P2152, P2155, P216A, or P216D is not set.

* The ignition voltage is greater than 10 volts.

* The engine speed is greater than 240 RPM.

* The air flow into the engine is greater than 220 grams.

* The HO2S 1 heater duty cycle is greater than 90 percent for greater than 5 seconds.

* The evaporative emissions system (EVAP) is not performing an intrusive test.

* The ECM is not commanding the air/fuel mixture lean.

* DTC P0131 and P0151 run continuously once the conditions above exist for greater than 5 seconds.

Condition 2

* DTC P0116, P0117, P0118, P0119, P0201, P0202, P0203, P0204, P0205, P0206 P0261, P0262, P0264, P0265, P0267, P0268, P0270,

P0271, P0273, P0274, P0276, P0277, P2146, P2149, P2152, P2155, P216A, or P216D is not set.

* The ignition voltage is greater than 10 volts.

* The engine speed is greater than 240 RPM.

* The conditions for a cold start are present.

* The HO2S 1 heater duty cycle is greater than 90 percent.

* DTC P0131 and P0151 run continuously once the conditions above exist for greater than 5 seconds.

Conditions for Setting the DTC

Condition 1

The ECM detects that an HO2S 1 signal voltage is less than 60 mV while the corresponding HO2S 2 voltage is greater than 500 mV.

Condition 2

The ECM detects that an HO2S 1 signal voltage is less than 60 mV after a cold start.

Action Taken when the DTC Sets

DTCs P0131 and P0151 are Type B DTCs.

2010 Cadillac Truck SRX AWD V6-3.0L Page 1195

2010 Cadillac Truck SRX AWD V6-3.0L Page 1195

Typical Scan Tool Data

Circuit/System Description

The heated oxygen sensors (HO2S) are used for fuel control and catalyst monitoring. Each HO2S compares the oxygen content of the surrounding

air with the oxygen content of the exhaust stream. When the engine is started, the control module operates in an Open Loop mode, ignoring the

HO2S signal voltage while calculating the air-to-fuel ratio. While the engine runs, the HO2S heats up and begins to generate a voltage within a

range of 0-1,275 mV. Once sufficient HO2S voltage fluctuation is observed by the control module, Closed Loop is entered. The control module

uses the HO2S voltage to determine the air-to-fuel ratio. An HO2S voltage that increases toward 1,000 mV indicates a rich fuel mixture. An HO2S

voltage that decreases toward 0 mV indicates a lean fuel mixture.

The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed

Loop earlier and the control module to calculate the air-to-fuel ratio sooner.

Conditions for Running the DTC

* DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128,

P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516,

P2101, P2119, P2135, P2176 are not set.

* The ignition 1 voltage is between 10-32 V.

* The engine run time is greater than 150 s.

* The fuel system is in Closed Loop.

* The DTCs run continuously when the above conditions are met.

Conditions for Setting the DTC

P0134 or P0154

* The ECM detects that the HO2S 1 voltage is between 350-550 mV.

* The HO2S heater warm-up cycle is complete.

* The DTCs set within 15 s when the above conditions are met.

P0140 or P0160

* The ECM detects that the HO2S 2 voltage is not varying.

* The HO2S heater warm-up cycle is complete.

* The DTCs set within 15 s when the above conditions are met.

2010 Cadillac Truck SRX AWD V6-3.0L Page 1142

2010 Cadillac Truck SRX AWD V6-3.0L Page 1142

Typical Scan Tool Data

Circuit Description

The engine coolant temperature (ECT) sensor is a variable resistor that measures the temperature of the engine coolant. The engine control module

(ECM) supplies 5 V to the ECT signal circuit and supplies a ground to the low reference circuit.

The following table illustrates the difference between temperature, resistance, and voltage:

Conditions for Running the DTC

P0117

* The engine is operating.

* The start up intake air temperature (IAT) is less than 72掳C (161掳F).

OR

* The start up intake air temperature (IAT) is greater than 72掳C (161掳F).

* The engine run time is greater than 59 s.

* The DTC runs continuously once the above conditions are met.

P0118

* The ignition is ON or the engine is operating.

* The DTC runs continuously once the above condition is met.

Conditions for Setting the DTC

P0117

The ECM detects that the ECT is greater than 140掳C (284掳F) for greater than 1 s or a cumulative of 10 s.

P0118

The ECM detects that the ECT is less than -39掳C (-38掳F) for greater than 1 s or a cumulative of 10 s.

Action Taken When the DTC Sets

DTC P0117 and P0118 are Type B DTCs.

The ECM may activate the Cooling Fans at high speed.

Conditions for Clearing the MIL/DTC

DTC P0117 and P0118 are Type B DTCs.

Diagnostic Aids

* Test the ECT sensor at various temperature levels in order to evaluate the possibility of a skewed sensor. A skewed sensor can result in a

2010 Cadillac Truck SRX AWD V6-3.0L Page 933

2010 Cadillac Truck SRX AWD V6-3.0L Page 933

Typical Scan Tool Data

Circuit/System Description

The heated oxygen sensors (HO2S) are used for fuel control and catalyst monitoring. Each HO2S compares the oxygen content of the surrounding

air with the oxygen content of the exhaust stream. When the engine is started, the control module operates in an Open Loop mode, ignoring the

HO2S signal voltage while calculating the air-to-fuel ratio. While the engine runs, the HO2S heats up and begins to generate a voltage within a

range of 0-1,275 mV. Once sufficient HO2S voltage fluctuation is observed by the control module, Closed Loop is entered. The control module

uses the HO2S voltage to determine the air-to-fuel ratio. An HO2S voltage that increases toward 1,000 mV indicates a rich fuel mixture. An HO2S

voltage that decreases toward 0 mV indicates a lean fuel mixture.

The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed

Loop earlier and the control module to calculate the air-to-fuel ratio sooner.

Conditions for Running the DTC

P0131, P0137, P0151, or P0157

* DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128,

P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516,

P2101, P2119, P2135, P2176 are not set.

* The engine is operating in Closed Loop.

* The Ignition 1 voltage is between 10-32 V.

* The fuel level is greater than 10 %.

* The throttle position (TP) is between 3-70 %.

* The DTCs run continuously when the above conditions are met for 2 s.

P0132, P0138, P0152, or P0158

* DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128,

P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516,

P2101, P2119, P2135, P2176 are not set.

* The engine is operating in Closed Loop.

* The Ignition 1 voltage is between 10-32 V.

* The fuel level is greater than 10 %.

* The throttle position (TP) is between 0-70 %.

* The DTCs run continuously when the above conditions are met for 3 s.

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1110

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1110

Typical Scan Tool Data

Circuit Description

The heated oxygen sensors (HO2S) are used for fuel control and catalyst monitoring. Each HO2S compares the oxygen content of the surrounding

air with the oxygen content of the exhaust stream. When the engine is started, the control module operates in an Open Loop mode, ignoring the

HO2S signal voltage while calculating the air-to-fuel ratio. The control module supplies the HO2S with a reference, or bias voltage of about 450

mV. While the engine runs, the HO2S heats up and begins to generate a voltage within a range of 0-1,000 mV. This voltage will fluctuate above

and below the bias voltage. Once sufficient HO2S voltage fluctuation is observed by the control module, Closed Loop is entered. The control

module uses the HO2S voltage to determine the air-to-fuel ratio. An HO2S voltage that increases above bias voltage toward 1,000 mV indicates a

rich fuel mixture. An HO2S voltage that decreases below bias voltage toward 0 mV indicates a lean fuel mixture.

The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed

Loop earlier and the control module to calculate the air-to-fuel ratio sooner.

Conditions for Running the DTCs

P0137 and P0157

* DTC P0036, P0037, P0038, P0056, P0057, P0058, P0116, P0117, P0118, P0119, or P0128 is not set.

* The engine speed is greater than 240 RPM.

* The ignition voltage is greater than 10 volts.

* The engine coolant temperature is colder than 40掳C (104掳F) at start-up and the engine coolant temperature was warmer than 60掳C (140掳F)

when the ignition was turned OFF last ignition cycle.

* The calculated exhaust temperature at the HO2S 2 is warmer than 700掳C (1,292掳F) and the HO2S 2 is warmed up for greater than 90

seconds.

* The calculated exhaust temperature is colder than 800掳C (1472掳F) 5 seconds after engine start.

* DTCs P0137 and P0157 run continuously once the above conditions are met.

P0138, P0140, P0158, and P0160

* The engine speed is greater than 240 RPM.

* The ignition voltage is greater than 10 volts.

* The HO2S 2 heater duty cycle is stable and the HO2S 2 is warmed up for greater than 90 seconds.

* The calculated exhaust temperature is colder than 800掳C (1472掳F).

* DTCs P0138 and P0158 run continuously once the above conditions are met for greater than 5 seconds.

* DTCs P0140 and P0160 run continuously once the above conditions are met for greater than 60 seconds.

Conditions for Setting the DTC

P0137 or P0157

The ECM detects that a secondary HO2S signal voltage is less than 60 mV for greater than 1 seconds of for a cumulative of 10 seconds.

P0138 or P0158

The ECM detects that the HO2S signal voltage is greater than 1,150 mV for greater than 1 seconds or for a cumulative of 10 seconds.

P0140 or P0160

* The ECM detects that the HO2S 2 signal voltage is between 401-519 mV.

* The ECM detects that the measured internal resistance of the HO2S 2 is greater than 40,000 ohms, when the calculated exhaust temperature

is warmer than 500掳C (932掳F).

2010 Cadillac CTS Sedan AWD V6-3.6L Page 947

2010 Cadillac CTS Sedan AWD V6-3.6L Page 947

Typical Scan Tool Data

Circuit/System Description

Heated oxygen sensors (HO2S) are used for fuel control and post catalyst monitoring. Each HO2S compares the oxygen content of the surrounding

air with the oxygen content in the exhaust stream. The HO2S must reach operating temperature to provide an accurate voltage signal. A heating

element inside the HO2S minimizes the time required for the sensors to reach operating temperature. Voltage is provided to the heater by an

ignition voltage circuit through a fuse. With the engine running, ground is provided to the heater by the HO2S heater low control circuit through a

low side driver within the engine control module (ECM). The ECM uses pulse width modulation (PWM) to control the HO2S heater operation to

maintain a specific HO2S operating temperature range.

Conditions for Running the DTC

P0030, P0036, P0050, or P0056

* The ignition 1 voltage is between 11-18 V.

* The engine speed is greater than 400 RPM.

* The DTCs run continuously when the above conditions are met.

P0053, P0054, P0059, or P0060

* DTCs P0112, P0113, P0117, P0118, or P2610 are not set.

* The engine run time is greater than 20 s.

* The ignition voltage is less than 18 V.

* The ignition is OFF for greater than 8 h.

* The engine coolant temperature (ECT) is between -30 to +45掳C (-22 to +113掳F) at engine start-up.

* The ECT and the intake air temperature (IAT) are within 8掳C (14掳F) at engine start-up.

* The DTCs run once per drive cycle when the above conditions are met.

P0135, P0141, P0155, or P0161

* DTCs P0116, P0117, P0118, P0125, or P0128 are not set.

* The ignition 1 voltage is between 10-32 V.

* The HO2S is at operating temperature.

* The HO2S is commanded ON.

* The DTCs run once per drive cycle when the above conditions are met for 120 s.

Conditions for Setting the DTC

P0030, P0036, P0050, or P0056

The ECM detects that the commanded state of the driver and the actual state of the control circuit do not match for greater than 5 s.

P0053, P0054, P0059, or P0060

The ECM detects the HO2S heater is not within a specified resistance range at engine start-up.

P0135 or P0155

The ECM detects that the HO2S 1 heater current is greater than 3.1 amps, or less than 0.3 amps for greater than 8 s.

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1042

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1042

Typical Scan Tool Data

Circuit/System Description

The throttle body assembly contains 2 throttle position sensors. The TP sensors are mounted to the throttle body assembly and are not serviceable.

The TP sensors provide a signal voltage that changes relative to throttle blade angle. The Engine Control Module (ECM) supplies the TP sensors

with a common 5 V reference circuit , a common low reference circuit, and two independent signal circuits. The TP sensors have opposite

functionality. TP sensor 1 signal voltage decreases from greater than 4 V at idle to less than 1 V at wide open throttle (WOT). TP sensor 2 signal

voltage increases from less than 1 V at idle to greater than 4 V at WOT.

Conditions for Running the DTC

* The ignition voltage is greater than 7 V.

* The ignition is ON, with the engine OFF, or the engine is operating.

* DTC P0121 runs continuously once the above conditions are met.

Conditions for Setting the DTC

P0121

The TP sensor 1 disagrees greater than 9 percent from TP sensor 2, or TP sensor 1 disagrees greater than 9 percent from the predicted value for

greater than 1 s.

P0122

The ECM detects the TP sensor 1 signal voltage is less than 0.18 V for greater than 1 s.

P0123

The ECM detects the TP sensor 1 signal voltage is greater than 4.6 V for greater than 1 s.

P0221

The TP sensor 2 disagrees greater than 9 percent from TP sensor 1, or TP sensor 2 disagrees greater than 9 percent from the predicted value for

greater than 1 s.

P0222

The ECM detects the TP sensor 2 signal voltage is less than 0.16 V for greater than 1 s.

P0223

The ECM detects the TP sensor 2 signal voltage is greater than 4.9 V for greater than 1 s.

Action Taken When the DTC Sets