2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2415
瀚慖f the MAP sensor pressure is not within the specified range, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic
Trouble Code Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle) for DTC P0106 for further diagnosis.
7. 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
1. Inspect for the following conditions:
* A dirty or deteriorating air filter element
* A leaking, loose, or cracked PCV pipe or seal
* A loose or disconnected charge air cooler hose or pipe
* A restricted or collapsed air intake duct
* A misaligned or damaged air intake duct
* Any objects blocking the air inlet probe of the MAF/IAT sensor
* Any contamination or debris on the sensing elements in the probe of the MAF/IAT sensor
* A cracked or damaged MAF sensor housing
* Any water intrusion in the induction system
* Any snow or ice build-up at the air cleaner, MAF or MAP sensors in cold climates
* An intake manifold leak
* A MAP sensor seal that is leaking, missing, or damaged
* An Intake Manifold Resonator with a leaking seal, or a cracked or broken housing
瀚慖f you find any of the above conditions, repair as necessary.
2. Ignition OFF, disconnect the harness connector at the MAF/IAT sensor.
3. Ignition OFF, all vehicle systems OFF, this may take up to 2 min, test for less than 5 ohm between the ground circuit terminal E and ground.
瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.
4. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 ohm
between the IAT sensor low reference circuit terminal A and ground.
瀚慖f greater than the specified range, test the IAT sensor low reference circuit for an open/high resistance. If the circuit tests normal, replace
the ECM.
5. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal D and ground.
瀚慖f the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
6. Ignition ON, test for 4.8-5.2 V between the MAF signal circuit terminal C and ground.
瀚慖f less than the specified range, test the MAF signal circuit for a short to ground or an open/high resistance. If the circuit tests normal,
replace the ECM.
瀚慖f greater than the specified range, test the MAF signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
7. Ignition OFF, connect the red lead of the J 38522 to the MAF signal circuit terminal C at the MAF/IAT sensor harness connector. Connect
the battery voltage supply to B+, and the black lead to ground.
8. Set the J 38522 Signal switch to 5 V, the Frequency switch to 5K, and the Duty Cycle switch to Normal.
9. Engine idling, observe the scan tool MAF Sensor parameter. The scan tool MAF Sensor parameter should be between 4,950-5,050 Hz.
瀚慖f not within the specified range, replace the ECM.
10. If all circuits test normal, test or replace the MAF/IAT sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Air
Flow Meter/Sensor/Service and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup and programming
P1133
DTC P0133, P013A-P013F, P014A, P014B, P0153, P1133, or P1153
Diagnostic Instructions
