2010 Cadillac Truck SRX FWD V6-3.0L Page 1893
* 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)
* Electrical Center Identification Views (See: Maintenance/Fuses and Circuit Breakers/Fuse/Application and ID)
* Probing Electrical Connectors (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Circuit Testing/Probing Electrical Connectors)
* 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
Note: On the scan tool, the powertrain relay is referred to as the engine controls ignition relay.
1. If DTC P0685 or P0690 is set, diagnose that DTC first.
2. Ignition ON, observe the scan tool Ignition 1 Voltage signal and the Engine Controls Ignition Relay Feedback signal parameters. There
should be no more than 3 V difference between the two parameters.
3. Operate the vehicle within the Conditions for Running the DTC. 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 ON, observe the Ignition 1 Signal and the Engine Controls Ignition Relay Feedback scan tool parameter to determine which is more
than 3 V lower than the other.
Note: The Ignition 1 Signal is supplied by the Run/Crank relay. The Engine Controls Ignition Relay Feedback signal is supplied by the
powertrain relay.
2. Ignition OFF, remove the relay that corresponds to the scan tool parameter that is more than 3 V lower.
Note: A resistance of 6 ohm or greater in the circuit/underhood fuse block will cause the DTC to set.
3. Connect a 20 A fused jumper wire between B+ and the applicable ignition voltage circuit terminal 30. Ignition ON, verify that the applicable
scan tool parameter displays between 9-14 V.
瀚慖f the applicable scan tool parameter is less than the specified value, test the ignition voltage circuit for an open/high resistance. If the
circuit tests normal, replace the K20 ECM.
4. Ignition OFF, connect a DMM set to the diode setting between the control circuit terminal 85 and ground. Verify the DMM displays OL.
瀚慖f not the specified value, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.
5. Ignition ON, verify the DMM displays less than 1 V.
瀚慖f not the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the
K20 ECM.
6. If all circuits test normal, replace the applicable relay.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Relay Replacement (Attached to Wire Harness) (See: Power and Ground Distribution/Power Distribution Relay/Service and Repair/Relay
Replacement (Attached to Wire Harness))Relay Replacement (Within an Electrical Center) (See: Power and Ground Distribution/Power
Distribution Relay/Service and Repair/Relay Replacement (Within an Electrical Center))
* Control Module References (See: Testing and Inspection/Programming and Relearning)for ECM replacement, setup, and programming
