P1298
DTC P1298: ELD Circuit High Voltage1. Reset the ECM.
2. Start the engine.
3. Turn on the headlights.
Is DTC P1298 indicated?
YES - Go to step 4.
NO - Intermittent failure, system is OK at this time. Check for poor connections or loose wires at the ELD and at the ECM.
4. Turn the ignition switch and headlights OFF.
5. Disconnect the ELD 3P connector.
6. Turn the ignition switch ON (II).
7. Measure voltage between ELD 3P connector terminal No.1 and body ground.
Is there battery voltage?
YES - Go to step 8.
NO - Repair open in the wire between the No.4 (7.5 A) fuse and the ELD.
8. Turn the ignition switch OFF.
9. Connect ELD 3P connector terminal No.3 to body ground with a jumper wire.
10. Disconnect ECM connector A (32P).
11. Check for continuity between ECM connector terminal A30 and body ground.
Is there continuity?
YES - Go to step 12.
NO - Repair open in the wire between the ECM (A30) and the ELD.
12. 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 ELD connector terminal No.2 and G301.
13. Reconnect the ELD 3P connector.
14. Start the engine and let it idle.
15. While measuring voltage between ECM connector terminals A30 and B20, turn the headlights on (low).
Does the voltage drop?
YES - Update the ECM if it does not have the latest software, or substitute a known-good ECM, then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM.
NO - Replace the ELD.