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Home >> Eagle >> 1993 >> Vision ESi >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 3.3L/3.5L >> Fault Code Tests >> Test FC-37A - Low Speed Fan CTRL Relay Circuit (DTC 35)
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Test FC-37A - Low Speed Fan CTRL Relay Circuit (DTC 35)

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION . For appropriate wiring diagram, see WIRING DIAGRAMS  at end of article.
  1. Using DRB-II, erase faults. Actuate low speed radiator fan relay. If a clicking sound cannot be heard when relay is actuated, go to step 6). If a clicking sound can be heard when relay is actuated, go to next step.
  2. At this time, the condition required to set fault is not present. LOW SPEED FAN CTRL RELAY CIRCUIT fault sets if the relay control circuit does not reflect the proper state (high or low) requested by Powertrain Control Module (PCM). Possible causes are: open or shorted coil in relay, control circuit wire open or shorted, open or shorted ignition power feed to relay, or failed control circuit driver in PCM.
  3. Inspect wiring and connectors. Repair as required. Perform TEST VER-2. If wiring and connectors are okay, wiggle harness from relay to PCM.
    NOTE: In order to attempt to reset fault, actuator test must be running for this portion of test.
  4. Using DRB-II, read faults. If low speed fan control relay circuit fault returns, repair wiring where wiggling caused fault to return. Perform TEST VER-2.
  5. If low speed fan control relay circuit fault does not return, see INACTIVE FAULT CONDITION . Perform TEST VER-2.
  6. If a clicking sound could not be heard when relay was actuated instep 1), remove low speed radiator fan relay and substitute another relay. Low speed radiator fan relay is located in power distribution center, near left shock tower. If substitute relay clicking sound can be heard, replace original relay. Perform TEST VER-2. If substitute relay clicking sound cannot be heard, remove substitute low speed radiator fan relay.
  7. Place DRB-II in voltmeter mode. Using DRB-II, check voltage of low speed radiator fan relay connector terminal "A" ignition feed wire (Green/Black wire). If voltage is less than 10 volts, repair ignition feed wire. Perform TEST VER-2.
  8. If voltage is more than 10 volts, turn ignition off. Disconnect Powertrain Control Module (PCM). Place DRB-II in ohmmeter mode. Using DRB-II, check resistance of low speed radiator fan relay connector terminal "C" low speed radiator fan relay control wire (White wire).
  9. If resistance is less than 5 ohms, repair low speed radiator fan relay control wire for short to ground. Perform TEST VER-2. If resistance is more than 5 ohms, go to next step.
  10. Using an external ohmmeter, check resistance of low speed radiator fan control wire (White wire) between radiator fan low speed radiator fan relay connector terminal "C" and PCM connector terminal No. 32.
  11. If resistance is more than 5 ohms, repair open low speed radiator fan control wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace radiator fan low speed relay. Perform TEST VER-2.
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