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Home >> Jeep >> 1996 >> Cherokee Classic, Part Time, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 4.0L >> Diagnostic Trouble Code (DTC) Identification >> Test TC-14A - Rad Fan Control Relay Circuit
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Test TC-14A - Rad Fan Control Relay Circuit

NOTE: For connector terminal identification, refer to CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.
  1. Using scan tool, actuate radiator fan relay. If radiator fan relay does not click, go to step 5). If radiator fan relay clicks, go to next step.
  2. Condition required to set DTC is not present at this time. RAD FAN CONTROL RELAY CIRCUIT DTC sets if an open or shorted circuit exists in radiator fan relay circuit. Possible causes are: open or shorted wiring to radiator fan relay, defective radiator fan relay, defective PCM, defective connectors or wiring. Go to next step.
  3. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, go to next step.
  4. Wiggle wiring harness from radiator fan relay to PCM while radiator fan relay is still actuated. If radiator fan relay stops clicking, repair wiring harness as necessary and perform TEST VER-2A. If radiator fan relay continues clicking, see INACTIVE DTC CONDITION . Test is complete. Perform TEST VER-2A .
  5. Disconnect radiator fan relay connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A. If connector and terminals are okay, go to next step.
  6. Using scan tool in voltmeter mode, check voltage on radiator fan relay connector, fused ignition switch output circuit (Dark Blue/White wire). If voltage is 10 volts or less, repair open fused ignition switch output circuit and perform TEST VER-2A. If voltage is more than 10 volts, go to next step.
  7. Using an external ohmmeter, check resistance between radiator fan relay terminals No. 85 and 86. See Figure. If resistance is 100 ohms or more, replace radiator fan relay and perform TEST VER-2A. If resistance is less than 100 ohms, go to next step.
  8. Turn ignition off. Disconnect Powertrain Control Module (PCM) Gray connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A . If connector and terminals are okay, go to next step.
  9. Using scan tool in ohmmeter mode, check resistance of PCM Gray connector, radiator fan relay control circuit (Dark Blue/Pink wire). If resistance is less than 5 ohms, repair short to ground in radiator fan relay control circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
  10. Using external ohmmeter, check resistance of radiator fan relay control circuit (Dark Blue/Pink wire) between radiator fan relay connector and PCM Gray connector. If resistance 5 ohms or more, repair open radiator fan relay control circuit and perform TEST VER-2A. If resistance is less than 5 ohms, replace PCM and perform TEST VER-2A .
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