2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1045
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)
Description and Operation
Air Intake System Description (LF1)
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 Signal Generator
Circuit/System Verification
1. Engine idling for 1 minute, observe the DTC information with a scan tool. DTCs P0100, P0102 and P0103 should not set.
2. 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. Ignition OFF, disconnect the harness connector at the B75 MAF sensor.
2. Ignition OFF, remove the fuse that supplies B+ to terminal 56 X2 of the ECM.
3. 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 2 and the ground.
瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.
4. Install fuse that supplies B+ to terminal 56 X2 of the ECM.
Caution: Do NOT use the low reference circuit in the component harness connector for this test. Damage to the control module may occur
due to excessive current draw.
5. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 4 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. If the circuit tests normal and
the ignition circuit fuse is open, test all the components connected to the ignition circuit and replace as necessary.
6. Test for 4.8-5.2 V between the signal circuit terminal 5 and the ground circuit terminal 2.
瀚慖f less than the specified range, test the signal circuit for an open/high resistance or a short to ground. If the circuit/connections test
normal, replace the K20 ECM.
瀚慖f greater than the specified range, test the signal circuit for a short to voltage. If the circuit/connections test normal, replace the K20
ECM.
7. Ignition OFF, connect the red lead of the J 38522 to the signal circuit terminal 5 at the B75 MAF 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. Ignition ON, observe the scan tool MAF Sensor Hz parameter. The parameter should be between 4,950-5,050 Hz.
瀚慖f the parameter is not within the specified range, replace the K20 ECM.
10. If all circuits/connections test normal, replace the B75 MAF sensor.
