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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 B5 (positive) and A26 (negative). See Figure . If voltage is not about 5 volts, substitute a known-good ECM and recheck.
  3. If voltage is about 5 volts, reconnect connector "B" to main wiring harness. Momentarily connect terminals A15 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 Yellow wire of A/C clutch relay connector to ground. If A/C clutch clicks, repair open in Yellow 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 B5 (positive) and A26 (negative).
  6. If voltage is more than one volt, repair open in Blue/Red 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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