VIN 6
DTC P2510
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC P2510
- Engine Control Module Relay Circuit
Diagnostic Fault Information
Circuit/System Description
The powertrain relay is a normally open relay. The relay armature is held in the open position by spring tension. Battery positive voltage is supplied directly to the relay coil and the switch contact at all times. The engine control module (ECM) supplies the ground path to the relay coil control circuit via an internal integrated circuit called an output driver. When the ECM commands the powertrain relay ON, ignition 1 voltage is supplied to the ECM, and to several additional circuits.
If the relay fails to close, the engine will not crank. Communication will not be available with the use of a scan tool.
The relay table assumes that the vehicle battery is fully charged. Refer to Battery Inspection/Test (Battery Inspection/Test).
Conditions for Running the DTC
* The engine has transitioned from start to run.
OR
* After the ignition is turned OFF before ECM power down.
Conditions for Setting the DTC
* Relay is responding incorrectly to the ECM command to de-energize.
* This diagnostic test runs twice a drive cycle.
Action Taken When the DTC Sets
DTC P2510 is a Type A DTC.
Conditions for Clearing the DTC
DTC P2510 is a Type A DTC.
Reference Information
Schematic References
* Engine Controls Schematics ([1][2]Electrical Diagrams)
* Ground Distribution Schematics (Ground Distribution Schematics)
* Power Distribution Schematics (Power Distribution Schematics)
Connector End View Reference
Component Connector End Views (Connector End Views By Name)
Electrical Information Reference
* Battery Inspection/Test (Battery Inspection/Test)
* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Electrical Center Identification Views (Application and ID)
* Probing Electrical Connectors (Probing Electrical Connectors)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Troubleshooting with a Test Lamp (Troubleshooting with a Test Lamp)
* Wiring Repairs (Wiring Repairs)
Special Tools
J 43244 Relay Puller Pliers
Circuit/System Verification
1. If any DTCs other than DTC P2510 are set, diagnose those DTCs first. Refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code (DTC) List - Vehicle).
Note: If you cannot duplicate the condition, operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle with the conditions that you observed from the Freeze Frame/Failure Records.
2. The engine starts and runs.
3. DTC 2510 is not set.
4. Engine running, observe the DTC information with a scan tool. DTC P2510 should not set.
5. 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. With the ignition ON, disconnect the KR75 powertrain relay and observe with the scan tool for loss of communication.
• If the scan tool can still communicate with the vehicle, test the ignition voltage circuit supplied by the powertrain relay for a short to voltage. If the circuit tests normal, replace the K20 ECM.
2. With the ignition OFF, probe the relay control circuit terminal 87 at the underhood electrical center with a test lamp connected to B+.
• If the test lamp illuminates, test the relay control circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.
3. Ignition ON, probe the relay control circuit terminal 86 at the underhood electrical center with a test lamp connected to ground.
• If the test lamp illuminates, test the relay control circuit for a short to voltage.
4. If all circuits test normal, replace the KR75 powertrain relay.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Relay Replacement (Attached to Wire Harness) (Relay Replacement (Attached to Wire Harness))Relay Replacement (Within an Electrical Center) (Relay Replacement (Within an Electrical Center))
* Control Module References (Programming and Relearning) for ECM replacement, setup, and programming