2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1702

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1702

DTC P0155

- HO2S Heater Performance Bank 2 Sensor 1

DTC P0161

- HO2S Heater Performance Bank 2 Sensor 2

Diagnostic Fault Information

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 volts.

* The engine speed is greater than 400 RPM.

* The DTCs run continuously when the above conditions are met for 1 second.

P0053, P0054, P0059, or P0060

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

* The engine run time is greater than 3 seconds.

* The ignition voltage is less than 18 volts.

* The ignition is OFF for greater than 8 hours.

* 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 10-18 volts.

* 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 seconds.

Conditions for Setting the DTC

P0030, P0036, P0050, or P0056