'00-05 models
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2009 Honda S2000, 2008 Honda S2000, 2007 Honda S2000, 2006 Honda S2000, and 2005 Honda S2000. However, it is still accessible from the selected car via links, so may be relevant.
- Disconnect the alternator 4P connector.
- Start the engine, and turn on the headlights to high beam.
- Measure the voltage between alternator 4P connector terminal No. 2 and the positive terminal of the battery.Fig 1: Measuring Voltage Between Alternator 4P Connector Terminal 2 And Positive Terminal Of Battery
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there less than 1 V?
YES -Go to step 7.
NO -Go to step 4.
- Turn off the headlights, and turn the ignition switch to LOCK (0).
- Disconnect engine control module (ECM) connector C (31P).
- Check for continuity between ECM connector terminal C2 and body ground.
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES -Repair short to ground in the wire between alternator 4P connector terminal No. 2 and ECM connector terminal C2.
NO -Check for loose or poor connections at ECM connector C (31P). If the connection is OK, substitute a known-good ECM (see SUBSTITUTING THE ECM ), then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM (see ECM REPLACEMENT ).
- Turn off the headlights, and turn the ignition switch to LOCK (0).
- Disconnect ECM connector C (31P).
- Check for continuity between ECM connector terminal C2 and alternator 4P connector terminal No. 2.Fig 3: Checking Continuity Between ECM Connector Terminal C2 And Alternator 4P Connector Terminal No. 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES -Replace the alternator (see ALTERNATOR REMOVAL AND INSTALLATION ) or repair the alternator (see ALTERNATOR OVERHAUL ).
NO -Repair open in the wire between alternator 4P connector terminal No. 2 and ECM connector terminal C2.