DTC Troubleshooting: P1298 (20)
DTC P1298:
 ELD Circuit High Voltage
NOTE: Before you troubleshoot, record all freeze data and review the general troubleshooting information.
  1. Turn the ignition switch ON (II).
  1. Check the ELECTRICAL LOAD DETECTOR 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.■
  1. Turn the ignition switch OFF.
  1. Disconnect the ELD 3P connector.
  1. Turn the ignition switch ON (II).
  1. Measure voltage between ELD 3P connector terminal No. 1 and body ground.
Is there battery voltage?
YES -
Go to Step 7 .
NO -
Repair open in the wire between the No. 3 ALTERNATOR (10 A) fuse and the ELD, then go to Step 15 .
  1. Turn the ignition switch OFF, and wait 2 minutes.
  1. Disconnect ECM connector No. 2 (58P).
  1. Connect ELD 3P connector terminal No. 3 to body ground with a jumper wire.
  1. Check for continuity between ECM connector No. 2 terminal No. 23 and body ground.
Is there continuity?
YES -
Go to Step 11 .
NO -
Repair open in the wire between the ELD and ECM connector No. 2 terminal No. 23, then go to Step 15 .
  1. Connect ELD 3P connector terminal No. 2 to body ground with a jumper wire.
  1. Check for continuity between ECM connector No. 2 terminal No. 21 and body ground.
Is there continuity?
YES -
Go to Step 13 .
NO -
Repair open in the wire between the ELD and ECM connector No. 2 terminal No. 21, then go to Step 15 .
  1. Turn the ignition switch OFF.
  1. Reconnect all connectors.
  1. Turn the ignition switch ON (II).
  1. Reset the ECM with the HDS.
  1. Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES -
Go to Step 19 .
NO -
Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.■
  1. Reconnect all connectors.
  1. 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, 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. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.■