2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1142
Engine Controls Schematics (LAU) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics
(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)
Description and Operation
Fuel System Description (LF1) (See: Powertrain Management/Fuel Delivery and Air Induction/Description and Operation)Fuel System
Description (LAU or LY7) (See: Powertrain Management/Fuel Delivery and Air Induction/Description and Operation)
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
Circuit/System Verification
1. Observe the scan tool Cylinder 1-6 Current Misfire Counter. The Cylinder 1-6 Current Misfire Counters should not increment.
2. Engine operating, observe the scan tool DTC information. DTCs P0201, P0202, P0203, P0204, P0205, P0206, P0261, P0262, P0264, P0265,
P0267, P0268, P0270, P0271, P0273, P0274, P0276, and P0277 should not set.
3. 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 are captured in the Freeze Frame/Failure Records Data List.
Circuit/System Testing
1. Ignition OFF, disconnect the fuel injector multi-way harness connector X145.
Note: Testing for steps 2 through 4 is performed on the ECM side of the multi-way harness connector.
2. Ignition ON, connect a test lamp between each ignition circuit terminal 1/2 and ground. The test lamp should illuminate at each ignition
circuit.
瀚慖f the test lamp does not illuminate, test the ignition circuits for a short to ground, or an open/high resistance. If the circuits test normal
and the ignition circuit fuse is open, test or replace the appropriate Q17 fuel injector.
3. Test for 2.6-4.6 V between the appropriate fuel injector control circuit listed below and ground.
* Injector 1 terminal 3
* Injector 2 terminal 6
* Injector 3 terminal 4
* Injector 4 terminal 7
* Injector 5 terminal 5
* Injector 6 terminal 8
瀚慖f less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the K20 Engine Control Module.
瀚慖f greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control
Module.
4. Probe the appropriate fuel injector control circuit listed below with a test lamp connected to B+. Engine cranking, verify the test lamp flashes.
* Injector 1 terminal 3
* Injector 2 terminal 6
* Injector 3 terminal 4
* Injector 4 terminal 7
