Code 20: Electric Load Detector
- Turn ignition off. Remove BACK-UP fuse (7.5-amp) from underhood fuse box for 10 seconds to reset ECM. Start engine, and allow it to idle. Check ECM for fault codes. If Code 20 is not present, problem is intermittent. Check for poor or loose connections at MAP sensor and Electric Load Detector (ELD). Test drive vehicle and retest.
- If Code 20 is present, turn ignition off. Remove underhood fuse/relay box and remove lower cover. Disconnect 3-pin ELD connector. Turn ignition on. Measure voltage between ELD Black/Yellow wire (positive) and Black wire (negative). See Fig 1. If voltage is about 12 volts, go to step 4). If voltage is not about 12 volts, go to next step.
Courtesy of AMERICAN HONDA MOTOR CO., INC.
- Measure voltage between ELD Black/Yellow wire (+) and body ground. If about 12 volts are present, repair open circuit in Black wire between 3-pin ELD connector and ground (right side of engine compartment). If voltage is not about 12 volts, repair open Black/Yellow wire between ELD connector and ACG fuse No. 24.
- If voltage was about 12 volts in step 2), measure voltage between ELD Green/Red wire (+) and body ground (-). If voltage is not about 5 volts, repair open in Green/Red wire between ECM terminal D10 and ELD. If voltage is about 5 volts, turn ignition off.
- If voltage is about 5 volts, turn ignition off. Reconnect 3-pin ELD connector. Connect ECM Test Harness (07LAJ-PT3010A
) between ECM and ECM connectors. See Figure. Turn ignition on. Measure voltage between test terminals D10 (+) and D26 (-). If voltage does not drop when headlights are turned on, replace ELD. If voltage does drop when headlights are turned on, replace ECM and retest.