DTC Troubleshooting: P1298 (20)

DTC P1298:  ELD Circuit High Voltage

1.Start the engine, and let it idle.

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

Is 0.2 A or less indicated?


YES - Go to 3.


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


3.Turn the ignition switch OFF.

4.Disconnect the ELD 3P connector.

5.Turn the ignition switch ON (II).

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

 

Is there battery voltage?


YES - Go to 7.


NO - Repair open in the wire between the No. 4 ACG (10 A) fuse and the ELD, then go to 14.n

7.Turn the ignition switch OFF.

8.Connect ELD 3P connector terminal No. 3 to body ground with a jumper wire.

 

9.Jump the SCS line with the HDS.

10.Disconnect ECM/PCM connector E (31P).

11.Check for continuity between ECM/PCM connector terminal E15 and body ground.

 

Is there continuity?


YES - Go to 12.


NO - Repair open in the wire between the ECM/PCM (E15) and the ELD, then go to 14.n

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

 

Is there continuity?


YES - Go to 13.


NO - Repair open in the wire between the ELD and G301, then go to 14.n


13.Replace the under-hood fuse/relay box.

14.Reconnect all connectors.

15.Turn the ignition switch ON (II).

16.Reset the ECM/PCM with the HDS.

17.Do the ECM/PCM idle learn procedure.

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

Are any Temporary DTCs or DTCs indicated?


YES - Go to 19.


NO - Troubleshooting is complete.n

19.Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM.

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

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P1298 is indicated, check for poor connections or loose terminals at the ELD and the ECM/PCM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.


NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM.n