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Alternator (Alt) Fr Signal

WARNING: This page is about a different car, the 1996 Isuzu Oasis. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: This signal informs the PCM when the alternator is charging.
  1. Turn ignition off. Disconnect 4-pin alternator connector. Turn ignition on. Measure voltage between PCM connector terminals A9 and C17. See Figure . If about 5 volts exists, go to step 3). If about 5 volts does not exist, turn ignition off and disconnect negative battery cable.
  2. Disconnect PCM connector "C". Check for continuity between ground and PCM connector terminal C17. If continuity exists, repair short in wire between PCM connector and alternator connector. See WIRING DIAGRAMS  section. If continuity does not exist, substitute known-good PCM and recheck. If about 5 volts now exists, replace original PCM.
  3. Turn ignition off and reconnect alternator connector. Start engine and hold at 3000 RPM, with no load and transaxle in Neutral or Park, until radiator fan comes on. Measure voltage between PCM connector terminals A9 and C17. If voltage decreases when headlights and rear defogger is turned on, alternator FR signal is okay.
  4. If voltage does not decrease when headlights and rear defogger is turned on, turn ignition off. Disconnect negative battery cable. Disconnect PCM connector "C". See Figure . Disconnect 4-pin alternator connector.
  5. Connect jumper wire between ground and alternator harness connector terminal No. 2. See Fig 1 .
Fig 1: Identifying Alternator Connector (Oasis)
G96H10501Courtesy of AMERICAN HONDA MOTOR CO., INC.
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