2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2444
* 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)
* Probing Electrical Connectors (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Circuit Testing/Probing Electrical Connectors)
* Electrical Center Identification Views (See: Maintenance/Fuses and Circuit Breakers/Fuse/Application and ID)
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 35616 GM-Approved Terminal Test Kit
Circuit/System Verification
Note: On the scan tool, the powertrain relay is referred to as the EC ignition relay.
1. If DTCs P0685, P0689, or P0690 are set, diagnose those DTCs first.
2. Ignition ON, engine OFF, observe both the Ignition 1 Signal and the EC Ignition Relay Feedback Signal parameters on the scan tool. There
should be no more than 3 V difference between the 2 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 scan tool Ignition 1 Signal and the EC Ignition Relay Feedback 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 EC 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. Ignition ON, connect a 20 A fused jumper wire between B+ and the applicable ignition voltage circuit terminal 87. Verify that the applicable
scan tool parameter displays between 9-14 V.
瀚慖f 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 86 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 appropriate 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
