2010 Cadillac Truck SRX FWD V6-3.0L Page 1114

2010 Cadillac Truck SRX FWD V6-3.0L Page 1114

* 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 Signal Generator

Circuit/System Verification

1. Verify that the following DTCs are not set:

* 5 V reference circuits

* Camshaft position system performance

* Engine controls ignition relay circuits

* Ignition circuits-Body control module (BCM)

瀚慖f 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).

2. Verify that 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 operating at idle, observe the scan tool MAF Sensor parameter. The reading should be between 2,000-3,800 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 2-6 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. Verify the proper operation of the ECT and IAT sensors. A skewed or stuck 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 - Intake Air Temperature Sensor (

See: Powertrain Management/Computers and Control Systems/Specifications/Temperature Versus Resistance - Intake Air Temperature

Sensor).

7. Verify the proper operation of the MAP sensor. A skewed MAP sensor will cause the BARO value to be inaccurate. Refer to DTC P0106

(LF1) (See: P Code Charts/P0106).

8. 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. Verify the integrity of the entire air induction system by inspecting for the following conditions:

* Any damaged components

* Loose or improper installation

* An air flow restriction

* Any vacuum leaks

* Water intrusion

* In cold climates, inspect for any snow or ice buildup

* Inspect the B75B MAF/IAT sensor element for contamination.

2. Ignition OFF, disconnect the harness connector at the B75B MAF/IAT sensor.

3. Ignition OFF, remove the fuse that supplies B+ to terminal 52 X1 of the ECM.

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 ground circuit terminal B and ground.

瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.

5. Install fuse that supplies B+ to terminal 52 X1 of the ECM.

6. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal C 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.

7. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal A and ground.

瀚慖f less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace