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Alternator FR Signal

WARNING: This page is about a different car, the 1992 Acura Legend. However, it is still accessible from the selected car via links, so may be relevant.
  1. Connect PGM-FI test harness between ECU and ECU connectors. Unplug connector "D" from main wire harness only. DO NOT  disconnect from ECU. Turn ignition on. Measure voltage between terminals D9 (positive) and A26 (negative). If voltage is NOT about 5 volts, substitute a good known ECU and recheck.
  2. If voltage is about 4.5 volts, turn ignition off. Reconnect connector "D" to main harness. Start and warm engine to operating temperature. Measure voltage between ECU terminals D94 (positive) and A26.
  3. Turn headlights and rear defogger on. If voltage decreases, alternator FR signal is okay. Remove alternator sensor fuse for 10 seconds to reset ECU. If voltage does not decrease, go to next step.
  4. Turn ignition off. Unplug connector "D" from ECU only. Disconnect battery negative cable. Check for continuity between PGM-FI test harness terminal D9 and ground. If no continuity exists, go to step 6). If continuity exists, unplug Green connector from alternator.
  5. Check again for continuity between PGM-FI test harness terminal D9 and ground. If continuity does not exist, check alternator for possible failure. If continuity is present, repair White/Red wire between alternator and ECU terminal D9.
  6. Connect White/Red wire to body ground. Check for continuity between ECU terminal D9 and ground. If continuity exist, service alternator. If continuity does not exist, repair White/Red wire between alternator and ECU terminal D9.
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