2010 Cadillac CTS Sedan AWD V6-3.6L Page 1081

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1081

* 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).

* Either condition exists for greater than 1 second or for a cumulative of 10 seconds.

Action Taken when the DTC Sets

DTCs P0137, P0138, P0140, P0157, P0158, and P0160 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0137, P0138, P0140, P0157, P0158, and P0160 are Type B DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics (LLT) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics

(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit

Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

1. Engine idling, observe the appropriate scan tool HO2S 2 voltage parameter. The reading should fluctuate above and below the range of

2010 Cadillac CTS Sedan AWD V6-3.0L Page 1762

2010 Cadillac CTS Sedan AWD V6-3.0L Page 1762

* DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0220,

P0222, P0223, P0201, P0202, P0203, P0204, P0205, P0206, P0300, P0335, P0336, P0351, P0352, P0353, P0501, P0502, P0506, P0507,

P0601, P0602, P0603, P0604, P0606, P0607, P060D, P062F, P0641, P0651, P1101, P1516, P1682, P2101, P2119, P2120, P2122, P2123,

P2125, P2127, P2128, P2135, P2138, P2176, P2610 are not set.

This DTC runs for 12 s within the first 17 s of start-up, or until the calculated catalyst temperature is greater than 900掳C (1,652掳F). This diagnostic

runs once per trip when a cold start has been determined.

Conditions for Setting the DTC

The actual exhaust energy model does not match the expected exhaust energy model.

Action Taken When the DTC Sets

DTC P1400 is a Type A DTC.

Conditions for Clearing the MIL/DTC

DTC P1400 is a Type A DTC.

Reference Information

Description and Operation

Engine Control Module Description (See: Powertrain Management/Computers and Control Systems/Description and Operation/Engine Control

Module Description)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Diagnostic Aids

Any loading of the engine that lowers engine RPM, such as with partial application of the clutch, A/C cycling etc., during the first 17 s of engine

run time may set this DTC.

Circuit/System Verification

1. Allow the engine to cool.

2. Start and idle the engine for at least 2 min.

3. DTC P1400 should run and pass.

Circuit/System Testing

* Inspect the air intake system for the following:

- Damage, restriction, or modification

- Dirty or deteriorating air filter element

- Crankcase ventilation system for correct operation-Refer to Crankcase Ventilation System Inspection/Diagnosis (See: Powertrain

Management/Emission Control Systems/Positive Crankcase Ventilation/Testing and Inspection).

- Water intrusion

- Vacuum leak and other un-metered air downstream of the mass air flow (MAF) sensor

- Intake manifold leak

* Inspect the exhaust system for the following:

- Water intrusion

- Exhaust leak

- Damaged, restricted, modified or enhanced exhaust system-Refer to Symptoms - Engine Exhaust (See: Engine, Cooling and

Exhaust/Exhaust System/Testing and Inspection/Symptoms - Engine Exhaust).

* Inspect the engine mechanical for items that could alter the air flow into the combustion chamber. Refer to Symptoms - Engine Mechanical (

See: Engine, Cooling and Exhaust/Engine/Testing and Inspection/Symptom Related Diagnostic Procedures/Symptoms - Engine Mechanical).

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1786

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1786

* DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0220,

P0222, P0223, P0201, P0202, P0203, P0204, P0205, P0206, P0300, P0335, P0336, P0351, P0352, P0353, P0501, P0502, P0506, P0507,

P0601, P0602, P0603, P0604, P0606, P0607, P060D, P062F, P0641, P0651, P1101, P1516, P1682, P2101, P2119, P2120, P2122, P2123,

P2125, P2127, P2128, P2135, P2138, P2176, P2610 are not set.

This DTC runs for 12 s within the first 17 s of start-up, or until the calculated catalyst temperature is greater than 900掳C (1,652掳F). This diagnostic

runs once per trip when a cold start has been determined.

Conditions for Setting the DTC

The actual exhaust energy model does not match the expected exhaust energy model.

Action Taken When the DTC Sets

DTC P1400 is a Type A DTC.

Conditions for Clearing the MIL/DTC

DTC P1400 is a Type A DTC.

Reference Information

Description and Operation

Engine Control Module Description (See: Powertrain Management/Computers and Control Systems/Description and Operation/Engine Control

Module Description)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Diagnostic Aids

Any loading of the engine that lowers engine RPM, such as with partial application of the clutch, A/C cycling etc., during the first 17 s of engine

run time may set this DTC.

Circuit/System Verification

1. Allow the engine to cool.

2. Start and idle the engine for at least 2 min.

3. DTC P1400 should run and pass.

Circuit/System Testing

* Inspect the air intake system for the following:

- Damage, restriction, or modification

- Dirty or deteriorating air filter element

- Crankcase ventilation system for correct operation-Refer to Crankcase Ventilation System Inspection/Diagnosis (See: Powertrain

Management/Emission Control Systems/Positive Crankcase Ventilation/Testing and Inspection).

- Water intrusion

- Vacuum leak and other un-metered air downstream of the mass air flow (MAF) sensor

- Intake manifold leak

* Inspect the exhaust system for the following:

- Water intrusion

- Exhaust leak

- Damaged, restricted, modified or enhanced exhaust system-Refer to Symptoms - Engine Exhaust (See: Engine, Cooling and

Exhaust/Exhaust System/Testing and Inspection/Symptoms - Engine Exhaust).

* Inspect the engine mechanical for items that could alter the air flow into the combustion chamber. Refer to Symptoms - Engine Mechanical (

See: Engine, Cooling and Exhaust/Engine/Testing and Inspection/Symptom Related Diagnostic Procedures/Symptoms - Engine Mechanical).

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1340

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1340

* DTC P0100, P0101, P0102, P0103, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0418, P050C, P2227, P2228, P2229,

P2257, or P2258 is not set.

* Greater than 60 min has elapsed since the last cold start.

* The secondary air injection system has been commanded ON and OFF during the ignition cycle.

* The battery voltage is between 10-18 V.

* The engine speed is between 680-3,500 RPM.

* The Intake Air Temperature (IAT) is between -12 to +80掳C (10.4-176掳F).

* The Engine Coolant Temperature (ECT) is between -10.5 to +69.8掳C (13-158掳F).

* The Mass Air Flow (MAF) is less than 100 g/s.

* Catalyst heating is active.

* The Barometric Pressure (BARO) is less than 68 kPa (9.9 psi).

* The difference between intake air temp and engine coolant start temp is less than 15掳C (27掳F).

* DTC P0411 runs once per ignition cycle when the above conditions are met.

Conditions for Setting the DTC

* The ratio of the calculated secondary air mass flow to the modeled secondary air mass flow is less than 0.75 or greater than 1.2.

* DTC P0411 sets within 60 s when the above condition is met.

Action Taken When the DTC Sets

DTC P0411 is a Type B DTC.

Conditions for Clearing the DTC

DTC P0411 is a Type B DTC.

Reference Information

Schematic Reference

Engine Controls Schematics (LAU) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics

(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)

Description and Operation

Secondary Air Injection System Description (See: Powertrain Management/Emission Control Systems/Air Injection/Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

Note: Do not run secondary air injection pump for more than 1-2 minutes at a time. Running for an extended period of time without allowing

pump to cool may cause damage to the pump.

1. Ignition ON, observe the DTC information with a scan tool. Verify that DTC P2431, P2432, or P2433 is not set.

瀚慖f a DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic Trouble

Code (DTC) List - Vehicle) for further diagnosis.

2. Observe the scan tool Secondary Air Injection Pressure Sensor voltage parameter. The reading should be between 1.0-4.0 V.

3. Compare the scan tool BARO pressure parameter to the Altitude Versus Barometric Pressure (See: Powertrain Management/Computers and

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1934

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1934

* DTC P0111, P0112, P0113, P0116, P0117, P0118, P0119, P2600, P2602, or P2603 is not set.

* The ignition is OFF.

* The engine coolant temperature (ECT) at engine shut down is warmer than 110 掳C (230 掳F).

* The auxiliary coolant pump is enabled.

* The DTC runs continuously once the conditions above are met for greater than 30 S.

Conditions for Setting the DTC

P2600

The ECM detects the pump control circuit is open. The condition exists for 4 S or a cumulative of 30 S.

P2601

The ECM detects that the ECT decreases less than 2 掳C (4 掳F) within 60 seconds. The condition exists for 4 S or a cumulative of 30 S.

P2602

The ECM detects the pump control circuit is shorted to ground. The condition exists for 4 seconds or a cumulative of 30 seconds.

P2603

The ECM detects the pump control circuit is shorted to voltage. The condition exists for 4 seconds or a cumulative of 30 seconds.

Action Taken When the DTC Sets

The DTCs are Type C DTCs.

Conditions for Clearing the DTC

The DTCs are Type C DTCs.

Diagnostic Aids

* This diagnostic uses a comprehensive approach to the diagnosis of the KR31 auxiliary coolant pump relay and its related circuits. The

auxiliary coolant pump relay is a printed circuit board (PCB) relay. The relay is an integral component to the underhood bussed electrical

center (UBEC). It cannot be removed and it is not visible.

* Much of the diagnosis is performed at the ECM connectors. Great care should be taken to ensure that the correct terminals are tested and the

proper test probes are utilized when performing this diagnostic.

* The test lamp is used to provide a visual aid to observe the integrity of the KR31 relay, the UBEC and the relay control circuit.

* Grounding terminal X2-58 activates the powertrain relay, which will supply power through KR31 relay coil and the relay control circuit.

Under normal circumstances the test lamp will illuminate with dim intensity due to the load created by the KR31 relay coil. If the test lamp

does not illuminate, or illuminates brightly a condition exists in the KR31 relay control circuit or the UBEC.

Reference Information

Schematic Reference

* Engine Cooling Schematics (See: Engine, Cooling and Exhaust/Cooling System/Diagrams)

* Engine Controls Schematics (LAU) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls

Schematics (LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)