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Home >> Isuzu >> 2003 >> Axiom Base, RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Miscellaneous >> A/C Clutch Control (Rodeo, & Rodeo Sport 2.2L) >> Diagnostic Procedure

Diagnostic Procedure

  1. Perform On-Board Diagnostics II (OBD-II) System Check. See appropriate ON-BOARD DIAGNOSTIC II SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS article. After performing OBD-II system check, go to next step.
  2. Turn ignition ON, with engine OFF. Review and record Tech 2 Failure Records data, then clear the DTCs. Operate the vehicle within the Failure Records conditions as noted. Using the Tech 2, monitor "DTC" info for DTC P1546. Does the Tech 2 indicate DTC P1546 Ran and Passed? If yes, refer to DIAGNOSTIC AIDS  . If no, go to next Step.
  3. Turn ignition OFF. Remove the A/C Compressor Relay from the Underhood Electrical Center. Turn Ignition ON, with engine OFF. Using a DVM, check for voltage on the Fused pins removed from the A/C Compressor Clutch Relay connector. Does the DVM read 12 Volts? If yes, go to step  5 . If no, go to next Step.
  4. Check the suspect circuit(s) between the A/C Compressor Clutch Relay connector and the Fuse for A short to ground or an open circuit. Was the problem found? Verify repair.
  5. Turn ignition OFF. Disconnect the Powertrain Control Module (PCM) connectors from the PCM. Check the A/C compressor clutch relay control circuit between the PCM and underhood electrical center for a short to ground or an open circuit. Was the problem found? If yes, verify repair. If no, go to next step.
  6. Reinstall the A/C compressor clutch relay. Using a fused jumper, ground the A/C compressor clutch relay control circuit at the PCM connector. Turn ignition ON, with engine OFF. Does the A/C Compressor turn ON? If yes, go to Step  9 . If no, go to next step.
  7. Turn ignition OFF. Check the A/C compressor clutch circuit between the A/C compressor clutch relay and A/C compressor clutch for An open circuit or a short to voltage. Was the problem found? If yes, verify repair. If no, go to next Step.
  8. Replace the A/C Compressor Clutch Relay. After relay is replaced, verify repair.
  9. Replace and reprogram PCM. See POWERTRAIN CONTROL MODULE REPLACEMENT under POWERTRAIN CONTROL MODULE in SELF-DIAGNOSTICS - RODEO & RODEO SPORT 2.2L article. After repair, repeat OBD-II system check. See ON-BOARD DIAGNOSTIC II SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS article.
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