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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 25 (Engine Controls - Tests W/Codes - 2.5L) >> Self-Diagnostic Tests >> Test TC-30A - Low Speed Fan CTRL Relay Circuit (DTC 35)

Test TC-30A - Low Speed Fan CTRL Relay Circuit (DTC 35)

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, actuate low speed radiator fan relay. If low speed radiator fan relay is not clicking, go to step 5). If low speed radiator fan relay is clicking, condition required to set DTC is not present at this time. Go to next step.
  2. LOW SPEED FAN CTRL RELAY CIRCUIT DTC sets if an open or short is detected in low speed radiator fan relay Dark Blue/Pink wire. Possible causes are: open or shorted low speed radiator fan relay coil windings, open or shorted low speed radiator fan relay Dark Blue/Pink wire, open or shorted low speed radiator fan relay Dark Blue/White wire, or failed 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 low speed radiator fan relay, wiggle wiring harness from low speed radiator fan 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  . Perform TEST VER-2.
  5. Disconnect low speed radiator fan relay. Put scan tool in voltmeter mode. Using scan tool, check voltage on low speed radiator fan 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, turn ignition off.
  6. Using an external ohmmeter, check resistance between low speed radiator fan relay terminals. See Figure . If resistance is m ore than 100 ohms, replace low speed radiator fan relay. If resistance is less than 100 ohms, go to next step.
  7. Disconnect PCM connector. Put scan tool in ohmmeter mode. Using scan tool, check resistance of low speed radiator fan relay connector Dark Blue/Pink wire. If resistance is less than 5 ohms, repair short to ground in Dark Blue/Pink 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/Pink wire between low speed radiator fan relay connector and PCM connector terminal No. 31. If resistance is more than 5 ohms, repair open Dark Blue/Pink wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.
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