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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 27 (Engine Controls - Tests W/Codes - 3.0L) >> Self-Diagnostic Tests >> Test TC-30A - A/C Clutch Relay Circuit (DTC 33)

Test TC-30A - A/C Clutch Relay Circuit (DTC 33)

WARNING: This page is about a different car, the 1995 Plymouth Voyager, 1995 Plymouth Grand Voyager, 1995 Dodge Grand Caravan, and 1995 Dodge Caravan. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION  . For wiring diagrams, see WIRING DIAGRAMS  section.
  1. Using scan tool, erase DTCs. Using scan tool, actuate A/C clutch relay. If A/C clutch relay is clicking, go to next step. If A/C clutch relay is not clicking, go to step 5).
  2. At this time, condition required to set DTC is not present. A/C CLUTCH RELAY CIRCUIT DTC sets if an open or short is detected in A/C clutch relay control circuit. Possible causes are: open or shorted A/C clutch relay coil, open A/C clutch relay Red/Light Blue wire, open or shorted A/C clutch relay Dark Blue/Orange wire, or inoperative circuit driver in PCM. Go to next step.
  3. Inspect all related wiring and connectors and repair as necessary. Perform TEST VER-2. If no problems are found with wiring and connectors, go to next step.
  4. While still actuating A/C clutch relay, wiggle wiring harness from A/C clutch relay to PCM. If relay stops clicking while wiggling wiring harness, repair wiring and connectors as necessary. Perform TEST VER-2. If relay does not stop clicking while wiggling wiring harness, see INACTIVE DTC CONDITION  .
  5. Disconnect A/C clutch relay. Using scan tool in voltmeter mode, check voltage on A/C clutch relay connector Dark Blue/White wire. If voltage is less than 10 volts, repair open Dark Blue/White wire. Perform TEST VER-2. If voltage is more than 10 volts, go to next step.
  6. Using an external ohmmeter, check resistance between A/C clutch relay terminals. See Figure . If resistance is more than 100 ohms, replace A/C clutch relay. If resistance is less than 100 ohms, go to next step.
  7. Turn ignition off. Disconnect PCM connector. Using scan tool in ohmmeter mode, check resistance of A/C clutch relay connector Dark Blue/Orange wire. If resistance is less than 5 ohms, repair short to ground in Dark Blue/Orange wire. Perform TEST VER-2. If resistance is more than 5 ohms, go to next step.
  8. Using an external ohmmeter, check resistance of Dark Blue/Orange wire between A/C clutch relay connector and PCM connector terminal No. 34. If resistance is more than 5 ohms, repair open Dark Blue/Orange wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.
NOTE: A break in test sequence occurs at this point. Sequence skips from TEST TC-30A to TEST TC-32A. No tests have been omitted.
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