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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 33 (Engine Controls - Tests W/Codes - 3.8L) >> Self-Diagnostic Tests >> Test TC-26A - A/C Clutch Relay Circuit (DTC 33)

Test TC-26A - 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, 1995 Dodge Caravan, and 1995 Chrysler Town & Country. 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 at the end of this article.
  1. Using scan tool, erase DTCs and 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. Condition required to set DTC is not present at this time. A/C CLUTCH RELAY CIRCUIT DTC sets if A/C clutch relay control circuit (Dark Blue/Orange wire) is not in its proper state when monitored by Powertrain Control Module (PCM). Possible causes are: open or shorted A/C clutch relay coil windings, open or shorted A/C clutch relay control circuit (Dark Blue/Orange wire), open or shorted A/C clutch relay ignition feed circuit (Dark Blue/White wire), or failed driver in Powertrain Control Module (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 Powertrain Control Module (PCM). Stop actuation of A/C clutch relay. Using scan tool, read DTCs. If A/C CLUTCH RELAY CIRCUIT DTC returns, repair wiring harness as necessary. Perform TEST VER-2. If A/C CLUTCH RELAY CIRCUIT DTC does not return, system is now functioning properly. Perform TEST VER-2.
  5. Remove A/C clutch relay. Install a known-good A/C clutch relay. If known-good A/C clutch relay is clicking, replace original A/C clutch relay. Perform TEST VER-2. If known-good A/C clutch relay is not clicking, remove known-good A/C clutch relay. Put scan tool in voltmeter mode.
  6. Using scan tool, check voltage on A/C clutch relay connector ignition feed circuit (Dark Blue/White wire). If voltage is less than 10 volts, repair open Dark Blue/White wire. Perform TEST VER-2.
  7. If voltage is more than 10 volts, using an external ohmmeter, check resistance between A/C clutch relay terminals. See Fig 1 . If resistance is more than 100 ohms, replace A/C clutch relay. If resistance is less than 100 ohms, go to next step.
  8. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using scan tool in ohmmeter mode, check resistance of A/C clutch relay connector control circuit (Dark Blue/Orange wire). If resistance is less than 5 ohms, repair short to ground in Dark Blue/Orange wire. Perform TEST VER-2.
  9. If resistance is more than 5 ohms, use an external ohmmeter to check resistance of control circuit (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.
Fig 1: Testing A/C Clutch Relay Circuit (All Models)
G94C31759
NOTE: A break in test sequence occurs at this point. Sequence skips from TEST TC-26A to TEST TC-28A. No tests have been omitted.
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