DTC Troubleshooting: P1298 (20)
|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.
|1.||Turn the ignition switch ON (II).|
|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 - 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 12.
|7.||Jump the SCS line with the HDS.|
|8.||Disconnect ECM/PCM connector A (44P).|
|9.||Check for continuity between ELD 3P connector terminal No. 3 and ECM/PCM connector terminal A23.|
Is there continuity?
YES - Go to 10.
NO - Repair open in the wire between the ECM/PCM (A23) and the ELD, then go to 12.
|10.||Check for continuity between ELD 3P connector terminal No. 2 and body ground.|
Is there continuity?
YES - Go to 11.
|11.||Replace the ELD.|
|12.||Reconnect all connectors.|
|13.||Turn the ignition switch ON (II).|
|14.||Reset the ECM/PCM with the HDS.|
|15.||Do the ECM/PCM idle learn procedure.|
|16.||Check for Temporary DTCs or DTCs with the HDS.|
Is DTC P1298 indicated?
YES - Go to 17.
NO - Troubleshooting is complete.n
|17.||Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM.|
|18.||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