Code 20: Electric Load Detector (Eld)
- Turn ignition off. Remove BACK UP fuse from underhood fuse/relay box for 10 seconds to reset ECU. Start engine and allow to idle. Turn headlights on. Check ECU for fault codes. See RETRIEVING CODES . If Code 20 is not present, problem is intermittent. Check for poor connections at ECU connector and ELD connector. Test drive vehicle and retest.
- If Code 20 is present, turn ignition off. Disconnect ELD 3-wire connector located in underhood fuse/relay box. Turn ignition on. Measure voltage between connector Black/Yellow wire terminal and Black wire terminal. 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-wire connector and ground. If battery voltage is not present, repair open in Black/Yellow wire between 3-wire connector and No. 2 fuse.
- If battery voltage was present in step 2), measure voltage between ELD connector Green/Red wire terminal and body ground. If 4.5-5.0 volts are present, turn ignition off. Reconnect 3-wire connector to ELD. Connect ECU Test Harness (07LAJ-PT3010A ) between ECU and ECU connector. See Figure . Turn ignition on.
- Measure voltage between test terminals A26 and D10 as follows:
- With headlight switch in first position, 2.5-3.5 volts should be present.
- With headlight switch in second position, 1.5-2.5 volts should be present.
If voltage is not as specified, replace ELD. If voltage is as specified, substitute a known good ECU, and recheck. If condition goes away, replace original ECU.