P2510

DTC P2510

DTC DESCRIPTOR

DTC P2510
Engine Control Module Relay Circuit

DIAGNOSTIC FAULT INFORMATION






IMPORTANT:
- Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
- An open fault in any engine control module (ECM) relay circuit will cause a no crank, no start condition and no communication with the scan tool.

CIRCUIT/SYSTEM DESCRIPTION
The ignition relay is normally an open relay. The relay armature is held in the open position by spring tension. When the ignition switch is turned to the Run or Start position, current will flow through the relay coil. A wire connected to the other end of the relay coil completes the path to ground through the ECM. The electromagnetic field created by the relay coil overcomes the spring tension and moves the armature, allowing the contacts to close.

When the ignition switch is turned to the OFF position, the electromagnetic field collapses. This action allows the spring tension to move the armature away from the relay contacts, which interrupts current flow to the fuses.

If the ignition relay fails to close, the engine will not crank. Communication will not be available with the use of a scan tool.

The ignition relay table assumes that the vehicle battery is fully charged. Refer to Battery Inspection/Test (Non-HP2) Battery Inspection/Test (HP2).

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
- The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
- The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.

CONDITIONS FOR CLEARING THE DTC
- The control module turns OFF the Malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic run and does not fail.
- A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
- A history DTC. clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
- Use a scan tool in order to clear the DTC.

SPECIAL TOOLS REQUIRED
J 43244 Relay Puller Pliers

CIRCUIT/SYSTEM VERIFICATION
- If any DTCs other than P2610 and P2510 are set then diagnose those DTCs first. Refer to Diagnostic Trouble Code (DTC) List - Vehicle.
- The engine starts and runs.

IMPORTANT: 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.

- DTC 2510 is not set.

CIRCUIT/SYSTEM TESTING
1. Observe the DTCs with a scan tool.
- If DTC P2610 is also set, test the battery voltage circuit for an open, a short to ground, or a faulty ECM.
2. With the ignition ON, disconnect the ECM relay and observe with the scan tool for loss of communication.
- If the scan tool can still communicate with the vehicle, test the IGN 1 voltage circuit supplied by the ECM relay for a short to voltage or a faulty ECM.
3. With the ignition OFF, probe the relay control circuit at the underhood electrical center with a test lamp connected to battery voltage.
- If the test lamp does not illuminate replace the ECM relay.
- If the test lamp illuminates test the relay control circuit for a short to ground or a faulty ECM.

REPAIR INSTRUCTIONS

IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ECM replacement, setup, and programming