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Alternator FR Signal

  1. Connect ECM test harness between ECM and ECM connectors. Unplug connector "D" from main wire harness only. DO NOT disconnect from ECM. Turn ignition on. Measure voltage between terminals D5 (positive) and A26 (negative). See Figure . If voltage is not about 5 volts, substitute a known-good ECM and recheck.
  2. If voltage is about 5 volts, turn ignition off. Reconnect connector "D" to main harness. Start and warm engine to operating temperature. Measure voltage between ECM terminals D5 (positive) and A26.
  3. Turn headlights and rear defogger on. If voltage does not decrease, go to next step. If voltage decreases, alternator FR signal is okay.
  4. Turn ignition off. Unplug connector "D" from ECM only. Disconnect negative battery cable. Check for continuity between ECM test harness terminal D5 and ground. If no continuity exists, go to step 6). If continuity exists, unplug Green connector from alternator.
  5. Check again for continuity between ECM test harness terminal D5 and ground. If continuity does not exist, check alternator for possible failure. If continuity exists, repair White/Red wire between alternator and ECM terminal D9.
  6. Connect White/Red wire to body ground. Check for continuity between ECM terminal D5 and ground. If continuity exist, service alternator. If continuity does not exist, repair White/Red wire between alternator and ECM terminal D9.
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