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Home >> Pontiac >> 2001 >> Aztek Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics >> Diagnostic Tests >> DTC P1546: A/C Clutch Relay Control Circuit >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform powertrain diagnostic system check. See POWERTRAIN DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check, go to next step.
  2. Turn ignition off. Check A/C compressor for free rotation operation. Start engine. Place HVAC control module in OFF position. If A/C compressor is still engaged, diagnose A/C compressor clutch for not disengaging. See appropriate A/C-HEATER SYSTEM article in AIR CONDITIONING & HEATING. If A/C compressor clutch is disengaged, go to next step.
  3. Turn ignition on, with engine off. Using scan tool, command the A/C clutch relay on and off. If A/C clutch relay turns on and off with each command, problem is intermittent. If A/C clutch relay does not turn on and off, go to next step.
  4. Turn ignition off. Disconnect A/C clutch relay (located in underhood fuse/relay block). Turn ignition on, with engine off. Using a test light connected to ground, probe A/C clutch relay terminal No. 1239 (power circuit). If test light illuminates, go to next step. If test light does not illuminate, go to step  11.
  5. Connect test light between A/C clutch relay terminals No. 459 and 1239. Using scan tool, command A/C clutch relay on and off . If test light turns on and off with each command, go to step  9. If test light does not turn on and off, go to next step.
  6. If test light remains on with each command, go to step  8. If test light does not remain on with each command, go to next step.
  7. Check for short to voltage in Dark Green/White wire between PCM harness connector C2 terminal No. 39 and underhood fuse/relay block terminal F7. See Figure. Repair as necessary. After repairs, go to step  14. If circuit is okay, go to step  10.
  8. Check for short to ground in Dark Green/White wire between PCM harness connector C2 terminal No. 39 and underhood fuse/relay block terminal F7. See Figure. Repair as necessary. After repairs, go to step  14. If circuit is okay, go to step  10.
  9. Check for poor connections at A/C clutch relay. Repair as necessary. After repairs, go to step  14. If connections are okay, go to step  12.
  10. Check for poor connections at PCM harness connector. Repair as necessary. After repairs, go to step  14. If connections are okay, go to step  13.
  11. Repair ignition 1 voltage circuit of A/C clutch relay at fuse/relay block. After repairs, go to step  14.
  12. Replace A/C clutch relay. After replacing relay, go to step  14.
  13. Replace PCM. Perform PCM relearn procedure. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After replacing PCM, go to next step.
  14. Turn ignition on, with engine off. Using scan tool, clear DTCs. Operate vehicle within the conditions for running this DTC. See CODE ENABLE CRITERIA . If DTC resets, go to step  3. If no DTCs are displayed, system is okay.
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