2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1842

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1842

* A current DTC, Last Test Failed, clears when the diagnostic runs and passes.

* A history DTC and related Freeze Frame data clears after 40 warm-up cycles, if no failures are reported by this or any other emission related

diagnostic.

* Clear the MIL and the DTC with a scan tool.

Reference Information

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)

Scan Tool Reference

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

Circuit/System Verification

* Disregard any transmission symptoms, antilock brake system (ABS) indicators, and traction control system (TCS) indicators until any fuel

trim faults are repaired. A fuel trim fault may cause default actions such as harsh shifts and illumination of the ABS/TCS indicators.

* E85 compatible engine only-Over estimation of the ethanol content will result in a rich shift of fuel trim values, and under-estimation will

result in a lean shift of fuel trim values. A fuel trim DTC may set if the learned alcohol content, Fuel Alcohol Content parameter on the scan

tool, is different than the measured alcohol content in the vehicle such that fuel trim values exceed failure threshold values. Refer to Fuel

Composition Diagnosis (See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Component Tests and

General Diagnostics).

* Verify that other DTCs are not set.

瀚慖f any DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic

Trouble Code (DTC) List - Vehicle).

* Allow the engine to reach operating temperature. With the engine running, observe the HO2S parameter with a scan tool. The HO2S value

should vary from approximately 40 mV to approximately 900 mV, and respond to fueling changes.

瀚慖f the value does not vary from approximately 40 mV to approximately 900 mV, refer to DTC P0131, P0132, P0137, P0138, P0151,

P0152, P0157, or P0158 (See: P Code Charts/P0131), DTC P0133, P013A-P013F, P014A, P014B, P0153, P1133, or P1153 ( See: P

Code Charts/P0133) or DTC P0134, P0140, P0154, or P0160 (See: P Code Charts/P0134).

Note: EVAP purge enablement may cause the FT to be momentarily outside the normal range.

* The normal Short Term FT parameter should be between +10 % and -10 %, with near 0 % the optimum, with the engine running at operating

temperature.

* The Long Term FT parameter should be between +10 % and -10 %, with near 0 % the optimum, with the engine running at operating

temperature.

* Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the

conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

P0171 or P0174

Allow the engine to reach operating temperature. With the engine running, observe the affected Long Term FT parameter with a scan tool. The

reading should be between 0-19 %.

If not within the specified range, inspect for the following:

* With the ignition ON and the engine OFF, observe the manifold absolute pressure (MAP) sensor parameter. The MAP sensor pressure should

be within the range specified for your altitude. Refer to Altitude Versus Barometric Pressure (See: Powertrain Management/Computers and

Control Systems/Specifications/Altitude Versus Barometric Pressure).

瀚慠efer to DTC P0106 (See: P Code Charts/P0106) if the MAP sensor does not indicate the correct barometric pressure.

* With the engine idling, observe the mass air flow (MAF) sensor parameter. The MAF sensor parameter should be within 2-6 g/s at idle.

瀚慠efer to DTC P0101 or P1101 (See: P Code Charts/P0101) or DTC P0102 or P0103 (See: P Code Charts/P0102) if the MAF sensor

parameter is not within 2-6 g/s at idle.