Sunday, December 22, 2019

2010 Cadillac Truck Escalade AWD V8-6.2L Page 2519

calculated airflow that is derived from the system of models for more than 0.5 s.

Action Taken When the DTC Sets

DTCs P0101 and P1101 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0101 and P1101 are Type B DTCs.

Diagnostic Aids

* A steady or intermittent high resistance of 15 ohm or greater on the ignition voltage circuit will cause the MAF sensor signal to be increased

by as much as 60 g/s. To pinpoint this condition perform a voltage drop test on the circuit.

* Any type of contamination on the MAF sensor heating elements will degrade the proper operation of the sensor. Certain types of

contaminants act as a heat insulator, which will impair the response of the sensor to airflow changes. Water or snow can create the opposite

effect, and cause the signal to increase rapidly.

* Depending on the current ambient temperature, and the vehicle operating conditions, a MAF sensor signal circuit that is shorted to the IAT

signal circuit will increase or decrease the MAF sensor signal that is interpreted by the ECM. Additionally it may cause a rapid fluctuation in

the IAT Sensor parameter.

* A skewed or stuck engine coolant temperature (ECT) or IAT sensor will cause the calculated models to be inaccurate and may cause this

DTC to run when it should not. Refer to Temperature Versus Resistance (See: Powertrain Management/Computers and Control

Systems/Specifications/Temperature Versus Resistance).

Reference Information

Schematic Reference

Engine Controls Schematics (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/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

Special Tools

J 38522 Variable Speed Generator

Circuit/System Verification

1. Verify that DTC P0641 or P0651 is not set.

锟斤拷If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code

Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle) for DTC P0641 or P0651 for further diagnosis.

2. Verify restrictions do not exist in the exhaust system. Refer to Restricted Exhaust (See: Engine, Cooling and Exhaust/Exhaust

System/Testing and Inspection/Restricted Exhaust).

3. Engine idling, observe the scan tool MAF Sensor parameter. The reading should be between 2,000-3,900 Hz depending on the ECT.

4. A wide open throttle (WOT) acceleration from a stop should cause the MAF Sensor parameter on the scan tool to increase rapidly. This

increase should be from 4-9 g/s at idle to greater than 180 g/s at the time of the 1-2 shift.

5. Use the scan tool and compare the MAF Sensor parameter to a known good vehicle under various operating conditions.

6. Ignition ON, observe the MAP sensor pressure parameter and compare to the Altitude Versus Barometric Pressure (See: Powertrain

Management/Computers and Control Systems/Specifications/Altitude Versus Barometric Pressure) table. The MAP sensor reading should be

within the specified range.

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