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.
