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Home >> Acura >> 1990 >> Integra LS, 2D Hatchback, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Idle Control System >> Alternator Fr Signal
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Alternator Fr Signal

  1. Connect PGM-FI test harness between ECU and ECU connectors. Disconnect connector "B" from the main wire harness only; DO NOT  disconnect from ECU. Turn the ignition on. Check voltage between terminals B14 (positive) and A18 (negative). If voltage is NOT approximately 5 volts, substitute a good known ECU and recheck.
  2. If voltage is about 5 volts, turn ignition off. Reconnect connector "B" to main harness. Start engine and warm it to operating temperature. Check voltage between ECU terminals B14 (positive) and A18 (negative). If voltage does not decrease, go to step 3). If voltage decreases when headlights or rear defogger are turned on, the alternator FR signal is okay. Turn ignition off. Remove alternator sensor fuse for 10 seconds to reset ECU.
  3. Disconnect connector "B" from ECU only. Disconnect negative battery cable from battery. Check for continuity between PGM-FI test harness terminal B14 and ground. If continuity is present, disconnect Green connector from alternator. Check again for continuity between PGM-FI test harness terminal B14 and ground. If continuity is NOT present, check alternator for possible failure. If continuity is present, repair Red/White wire between alternator and terminal B14 on ECU.
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