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Home >> Jeep >> 1996 >> Grand Cherokee Limited, 5.2 Y >> Repair and Diagnosis >> External Pages >> Different car >> Section 4 (Engine Controls - Tests W/Codes - 3.0L) >> Diagnostic Charts >> Test TC-33A - High Speed Fan CTRL Relay Circuit (DTC 35)

Test TC-33A - High Speed Fan CTRL Relay Circuit (DTC 35)

WARNING: This page is about a different car, the 1994 Plymouth Sundance, 1994 Plymouth Acclaim, 1994 Dodge Spirit, 1994 Dodge Shadow, and 1994 Chrysler LeBaron. 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 DIRECTORY  . For wiring diagrams, see WIRING DIAGRAMS  .
  1. Using DRB, erase trouble codes. Using DRB, actuate high speed radiator fan relay. If high speed radiator fan relay is clicking, go to next step. If high speed radiator fan relay is not clicking, go to step 5).
  2. At this time, condition required to set trouble code is not present. HIGH SPEED RADIATOR FAN CTRL RELAY CIRCUIT trouble code sets if an open or short is detected in high speed radiator fan relay control circuit. Possible causes are: high speed radiator fan relay coil open or shorted, open in high speed radiator fan relay Dark Blue wire, open or short in high speed radiator fan relay Yellow 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 high speed radiator fan relay, wiggle wiring harness from high speed radiator fan relay to PCM. If relay stopped clicking while wiggling wiring harness, repair wiring and connectors as necessary. Perform TEST VER-2. If relay did not stop clicking while wiggling wiring harness, see INACTIVE TROUBLE CODE CONDITION  . Perform TEST VER-2.
  5. Disconnect high speed radiator fan relay. Put DRB in voltmeter mode. Using DRB, check voltage on high speed radiator fan relay connector Dark Blue/White wire. If voltage is less than 10 volts, repair open in 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 high speed radiator fan relay terminals. See Fig 1 . If resistance is more than 100 ohms, replace high speed radiator fan relay. If resistance is less than 100 ohms, go to next step.
    Fig 1: Testing Relay (TC-33A)
    G94C31759
  7. Turn ignition off. Disconnect PCM connector. Put DRB in ohmmeter mode. Using DRB, check resistance of high speed radiator fan relay connector Yellow wire. If resistance is less than 5 ohms, repair short to ground in Yellow wire. Perform TEST VER-2. If resistance is more than 5 ohms, go to next step.
  8. Using an external ohmmeter, check resistance of Yellow wire between high speed radiator fan relay connector and PCM connector terminal No. 55. If resistance is more than 5 ohms, repair open in Yellow 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-33A  to TEST TC-38A. No tests have been omitted.
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