Code 20: Electric Load Detector (Eld)
- Turn ignition off. Remove BACK-UP fuse (10-amp) from underhood fuse/relay box for 10 seconds to reset ECM. Start engine, and allow it to idle. Turn headlights on. Check ECM for fault codes. If Code 20 is not present, problem is intermittent. Check for poor connections at ECM connector and ELD connector. Test drive vehicle and retest.
- If Code 20 is present, turn ignition off. Disconnect ELD 3-pin connector, located in underhood fuse/relay box. Turn ignition on. Measure voltage between connector Black/Yellow and Black wire terminals. If battery voltage is present, go to step 4). If battery voltage is not present, go to step 3).
- Measure voltage between Black/Yellow wire terminal and body ground. If battery voltage is present, repair open in Black wire between 3-pin connector and ground. If battery voltage is not present, repair open in Black/Yellow wire between 3-pin connector and ECM fuse (No. 2, 15-amp).
- If battery voltage was present in step 2), measure voltage between ELD connector Green/Red wire terminal and body ground. If voltage is not 4.5-5.0 volts, repair open or short in Green/Red wire between ECM terminal D10 and ELD. If 4.5-5.0 volts are present, turn ignition off. Reconnect 3-pin connector to ELD. Connect ECM Test Harness (07LAJ-PT3010A ) between ECM and ECM connectors. See Figure . Turn ignition on.
- Measure voltage between test terminals A26 and D10 as follows:
- With headlight switch in first position, 1.8-2.8 volts should exist.
- With headlight switch in second position, 0.8-1.8 volts should exist.
If voltage is not as specified, replace ELD. If voltage is as specified, replace ECM and retest.