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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 43 (Engine Controls - Tests W/Codes - 8.0L) >> Self-Diagnostic Tests >> Test TC-38A - A/C Clutch Relay Circuit (DTC 33)

Test TC-38A - A/C Clutch Relay Circuit (DTC 33)

WARNING: This page is about a different car, the 1995 Dodge Pickup and 1995 Dodge Cab & Chassis. 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, actuate A/C clutch relay. If A/C clutch relay is clicking, condition required to set trouble code is not present at this time. Go to next step. If A/C clutch relay is not clicking, go to step 5).
  2. A/C CLUTCH RELAY CIRCUIT trouble code sets if Powertrain Control Module (PCM) detects an open or short in A/C clutch relay control circuit (Dark Blue/Orange wire). Possible causes are: open or short in A/C clutch relay coil windings, open or short in A/C clutch relay control circuit (Dark Blue/Orange wire), open in A/C clutch relay fused ignition switch output circuit (Light Green/Black wire), or failed driver in PCM. Go to next step.
  3. Inspect all related wiring and connectors. 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 wiggling interrupts A/C clutch relay clicking, repair wiring harness as necessary. Perform TEST VER-2. If wiggling does not interrupt A/C clutch relay clicking, see INACTIVE DTC CONDITION  . Perform TEST VER-2.
  5. Remove A/C clutch relay. Using scan tool in voltmeter mode, check voltage on A/C clutch relay connector, fused ignition switch output circuit (Light Green/Black wire). If voltage is less than 10 volts, repair open Light Green/Black wire. Perform TEST VER-2.
  6. If voltage is more than 10 volts, turn ignition off. Using an external ohmmeter, check resistance across A/C clutch relay terminals. See Fig 1 . If resistance is more than 100 ohms, replace e A/C clutch relay. Perform TEST VER-2. If resistance is less than 100 ohms, go to next step.
    Fig 1: Testing Relay (Ram Pickup)
    G94C31759
  7. Disconnect Powertrain Control Module (PCM) connector. Using scan tool in ohmmeter mode, check resistance of PCM connector terminal No. 34, A/C clutch relay 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.
  8. If resistance is more than 5 ohms, using an external ohmmeter, 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.
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