DTC Troubleshooting

DTC Troubleshooting: P1298

DTC P1298: ELD Circuit High Voltage

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information. Initial Inspection and Diagnostic Overview

1. Turn the ignition switch to ON (II).

2. Check the ELD in the DATA LIST with the HDS.

Is 0.2 A or less indicated?
YES - Go to step 3.

NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the ELD and the ECM.


3. Turn the ignition switch to LOCK (0).

4. Disconnect the ELD 3P connector.

5. Turn the ignition switch to ON (II).

6. Measure the voltage between ELD 3P connector terminal No. 1 and body ground.

Is there battery voltage?
YES - Go to step 7.

NO - Check the No. 3 ALTERNATOR (10 A) fuse in the under-dash fuse/relay box. If the fuse is OK, repair open in the wire between the No. 3 ALTERNATOR (10 A) fuse and the ELD, then go to step 12.






7. Turn the ignition switch to LOCK (0).

8. Jump the SCS line with the HDS.

9. Disconnect ECM connector A (44P).

10. Check for continuity between ELD 3P connector terminal No. 3 and ECM connector terminal A23.

Is there continuity?
YES - Go to step 11.

NO - Repair open in the wire between the ECM (A23) and the ELD, then go to step 13.






11. Check for continuity between ELD 3P connector terminal No. 2 and body ground.

Is there continuity?
YES - Go to step 12.

NO - Repair open in the wire between the ELD and G301, then go to step 13.






12. Replace the ELD. Service and Repair

13. Reconnect all connectors.

14. Turn the ignition switch to ON (II).

15. Reset the ECM with the HDS.

16. Do the ECM idle learn procedure. ECM Idle Learn Procedure

17. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P1298 indicated?
YES - Go to step 18.

NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.


18. Update the ECM if it does not have the latest software, ECM Update or substitute a known-good ECM. Initial Inspection and Diagnostic Overview

19. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P1298 indicated?
YES - Check for poor connections or loose terminals at the ELD and the ECM. If the ECM was updated, substitute a known-good ECM, Initial Inspection and Diagnostic Overview then recheck. If the ECM was substituted, go to step 1.

NO - If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM. Service and Repair If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.