2010 Cadillac Truck SRX AWD V6-3.0L Page 1001
Conditions for Setting the DTC
The ECM detects that the voltage on the fuel economy mode switch signal wire is either too low or too high out of range.
Action Taken When the DTC Sets
DTCs P159F and P15A0 are Type B DTCs
Conditions for Clearing the MIL/DTC
DTCs P159F and P15A0 are Type B DTCs
Reference Information
Schematic Reference
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)
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. Ignition ON, verify the fuel economy mode indicator lamp on the instrument panel cluster is not illuminated.
2. Ignition ON, verify the fuel economy mode indicator lamp on the instrument panel cluster illuminates when the fuel economy mode switch
button is pressed.
3. Engine running, observe the scan tool DTC information. DTCs P159F and P15A0 should not set.
4. 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
Note: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
1. Ignition OFF, disconnect the harness connector at the S87 fuel economy mode switch.
Note: It may take up to 2 minutes for all vehicle systems to power down.
2. Ignition OFF and all vehicle systems OFF, test for less than 5 ohm between ground circuit terminal 2 of the harness connector and ground.
瀚慖f greater than the specified value, test the ground circuit for an open/high resistance and repair as necessary.
3. Ignition ON, test for 4.8-5.2 V between 5 V reference circuit terminal 9 of the harness connector and ground.
瀚慖f less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,
replace the K20 ECM.
瀚慖f greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
4. Ignition ON, test for 0.060-0.250 V between signal circuit terminal 10 of the harness connector 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
