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Air Conditioning Signal

  1. Connect ECM test harness between ECM and ECM connectors. Unplug connector "B" from main harness only. DO NOT disconnect from ECM. Turn ignition on.
  2. Measure voltage between ECM terminals B3 (positive) and A26 (negative). See Figure . If battery voltage does not exist, substitute a known-good ECM, and recheck voltage.
  3. If battery voltage exists, reconnect connector "B" to main wiring harness. Momentarily connect terminals A8 and A26 together, and check for clicking of A/C clutch.
  4. If A/C clutch clicks, go to next step. If A/C clutch does not click, jumper Red/Blue wire of A/C clutch relay connector to ground. If A/C clutch clicks, repair open in Red/Blue wire. If A/C clutch still does not click, repair A/C clutch circuit.
  5. Start engine. Turn blower on. Turn A/C switch on. If A/C operates, A/C signal is okay. If A/C does not operate, measure voltage between terminals B3 (positive) and A26 (negative).
  6. If voltage is more than one volt, repair open in Blue/Black wire between ECM terminal B5 and A/C pressure switch. If voltage is less than one volt, substitute a known-good ECM and recheck voltage.
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