2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1806

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1806

DTC P0140

- HO2S Circuit Insufficient Activity Bank 1 Sensor 2

DTC P0154

- HO2S Circuit Insufficient Activity Bank 2 Sensor 1

DTC P0160

- HO2S Circuit Insufficient Activity Bank 2 Sensor 2

Diagnostic Fault Information

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 300 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 for at least 50 s.

P0140 or P0160

The ECM detects that the HO2S 2 voltage is between 410-490 mV for at least 74 s.