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Home >> Eagle >> 1993 >> Vision ESi >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 3.3L/3.5L >> Fault Code Tests >> Test FC-34A - A/C Clutch Relay Circuit (DTC 33)

Test FC-34A - A/C Clutch Relay Circuit (DTC 33)

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION . For appropriate wiring diagram, see WIRING DIAGRAMS  at end of article.
  1. Using DRB-II, erase faults. Actuate A/C clutch relay. If A/C clutch relay clicking sound cannot be heard, go to step 6). If A/C clutch relay clicking sound can be heard, go to next step.
  2. At this time, the condition required to set fault is not present. A/C CLUTCH RELAY CIRCUIT fault sets if the clutch relay control circuit does not reflect proper state (high or low) requested by Powertrain Control Module (PCM). Possible causes are: relay coil shorted or open, control circuit wire shorted or open, open or shorted ignition power feed to relay coil, or failed control circuit driver to PCM.
  3. Inspect wiring and connectors. Repair as required. Perform TEST VER-2. If wiring and connectors are okay, wiggle wiring harness from relay to PCM.
    NOTE: In order to attempt to reset fault, actuator test must be running for this portion of test.
  4. Using DRB-II, read faults. If A/C CLUTCH RELAY CIRCUIT fault returns, repair necessary wiring where wiggling caused fault to reappear. Perform TEST VER-2.
  5. If A/C CLUTCH RELAY CIRCUIT fault did not return, see INACTIVE FAULT CONDITION . Perform TEST VER-2.
  6. If A/C clutch relay clicking sound could not be heard in step 1), remove A/C relay and substitute a known good relay. A/C relay is located in power distribution center, near left shock tower. If substitute A/C clutch relay clicks, replace original relay. Perform TEST VER-2.
  7. If substitute A/C relay does not click, remove substitute A/C relay. Place DRB-II in voltmeter mode. Using DRB-II, check voltage of A/C relay connector terminal "A" ignition feed wire (Light Green/Black wire).
  8. If voltage is less than 10 volts, repair open ignition feed wire from low speed fan control relay. Perform TEST VER-2. If voltage is more than 10 ohms, turn ignition off.
  9. Disconnect PCM connector. Place DRB-II in ohmmeter mode. Using DRB-II, check resistance of A/C clutch relay connector terminal "C",A/C clutch relay control wire (Dark Blue/Orange wire). If resistance is less than 5 ohms, repair A/C clutch relay control wire for short to ground. Perform TEST VER-2. If resistance is more than 5 ohms, go to next step.
  10. Using an external ohmmeter, check resistance of A/C clutch relay control wire (Dark Blue/Orange wire) between A/C clutch relay connector terminal "C" and PCM connector terminal No. 34.
  11. If resistance is more than 5 ohms, repair open A/C clutch relay control wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.
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