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Home >> Chevrolet >> 2000 >> Venture Base, Van Cargo Extended >> 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 On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC SYSTEM CHECK . After performing OBD system check, go to next step.
  2. Turn ignition on, with engine off. Using scan tool, command A/C relay on and off. If relay turns on and off with each command, see DIAGNOSTIC AIDS . If relay does not turn on and off with each command, go to next step.
  3. Turn ignition off. Disconnect A/C relay. Turn ignition on, with engine off. Using a test light connected to ground, probe relay coil feed circuit. If test light illuminates, go to next step. If test light does not illuminates, go to next step. If test light does not illuminate, go to step  10.
  4. Connect test light between relay control and coil feed circuit. Using scan tool, command A/C relay on and off. If test light turns on and off with each command, go to step  8. If test light does not turn on and off with each command, go to next step.
  5. If test light remains illuminated with each command, go to step  7. If test light does not remain illuminates with each command, go to next step.
  6. Check relay control circuit for short to voltage or open circuit. Repair as necessary. After repairs, go to step  13. If circuit is okay, go to step  9.
  7. Check relay control circuit for short to ground. Repair as necessary. After repairs, go to step  13. If circuit is okay, go to step  9.
  8. Check for faulty connections at relay. Repair as necessary. After repairs, go to step  13. If connections are okay, go to step  11.
  9. Inspect for faulty connections at PCM. Repair as necessary. After repairs, go to step  13. If connections are okay, go to step  12.
  10. Repair relay feed circuit. After repair, go to step  13.
  11. Replace A/C relay. After replacing relay, go to step  13.
  12. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  13. Using scan tool, select DTC, CLEAR INFO function. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter this DTC. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this test ran and passed, system is okay. If scan tool does not indicate that this test ran and passed, repeat step  2.
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