Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
Scheme 490
Scheme 491
Scheme 492
Scheme 493
- Start the engine, and let it idle.
- 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/PCM.
- Turn the ignition switch to LOCK (0).
- Disconnect the ELD 3P connector.
- Turn the ignition switch to ON (II).
- 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. 4 ACG (10 A) fuse in the under-dash fuse/relay box. If the fuse is OK, repair open in the wire between the No. 4 ACG (10 A) fuse and the ELD, then go to step 14 .
- Turn the ignition switch to LOCK (0).
- Connect ELD 3P connector terminal No. 3 to body ground with a jumper wire.
- Jump the SCS line with the HDS.
- Disconnect ECM/PCM connector E (31P).
- Check for continuity between ECM/PCM connector terminal E15 and body ground. Is there continuity? YES -Go to step 12. NO -Repair open in the wire between the ECM/PCM (E15) and the ELD, then go to step 14 .
- Check for continuity between ELD 3P connector terminal No. 2 and body ground. Is there continuity? YES -Go to step 13. NO -Repair open in the wire between the ELD and G301, then go to step 14 .
- Replace the ELD (see «ELD REPLACEMENT»(ref-355245-S34563935892010012100000) ).
- Reconnect all connectors.
- Turn the ignition switch to ON (II).
- Reset the ECM/PCM with the HDS.
- Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(ref-290807-S02808252682008072200000) ).
- Check for Temporary DTCs or DTCs with the HDS. Is DTC P1298 indicated? YES -Go to step 19. NO -Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.
- Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(ref-355245-S27182940282010012100000) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(ref-290833-S34742010492008072200000) ).
- 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/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(ref-290833-S34742010492008072200000) ), then recheck. If the ECM/PCM was substituted, go to step 1 . NO -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(ref-355245-S09328189752010012100000) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.