DTC Troubleshooting

DTC Troubleshooting: P1297

DTC P1297: ELD Circuit Low Voltage

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information. Reading and Clearing Diagnostic Trouble Codes

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

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

Is 72 A or more 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 PCM.


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

4. Disconnect the ELD 3P connector.

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

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

Is 72 A or more indicated?
YES - Go to step 7.

NO - Go to step 11.


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

8. Jump the SCS line with the HDS.

9. Disconnect PCM connector E (31P).

10. Check for continuity between PCM connector terminal E18 and body ground.

Is there continuity?
YES - Repair short in the wire between the PCM (E18) and the ELD, then go to step 13.

NO - Go to step 20.






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

12. Replace the under-hood fuse/relay box. Under-Hood Fuse/Relay Box Removal/Installation

13. Reconnect all connectors.

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

15. Reset the PCM with the HDS.

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

17. Start the engine.

18. Turn on the headlights.

19. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P1297 indicated?
YES - Check for poor connections or loose terminals at the ELD unit and the PCM, then go to step 1.

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


20. Reconnect all connectors.

21. Update the PCM if it does not have the latest software, PCM Update or substitute a known-good PCM. Reading and Clearing Diagnostic Trouble Codes

22. Start the engine.

23. Turn on the headlights.

24. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P1297 indicated?
YES - Check for poor connections or loose terminals at the ELD unit and the PCM. If the PCM was updated, substitute a known-good PCM, Reading and Clearing Diagnostic Trouble Codes then go to step 22. If the PCM was substituted, go to step 1.

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