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Probe 2.0L

NOTE: Before proceeding with cooling fan circuit tests, check self-diagnostic trouble codes. See appropriate TESTS W/CODES article in the ENGINE PERFORMANCE Section. Repair any trouble codes first. If no trouble codes exist, proceed with cooling fan testing procedure.

  1. Cooling Fan Inoperative

    Turn ignition off. Check 15-amp ENGINE fuse located in interior fuse panel and 40-amp COOLING FAN fuse located in main fuse panel. If new fuse blows repeatedly, disconnect Black/White wire at 10-pin connector and disconnect low and high speed fan relay connectors. Using DVOM, check for short to ground in Black/White wire. If resistance is more than 10,000 ohms, go to next step. Resistance less than 10,000 ohms indicates short in Black/White wire. Repair wire as necessary. Restore electrical connections.

  2. Checking Power Supply To Fan Relays

    Disconnect low and high speed fan relays. Turn ignition on. Measure voltage of Black/White wire at both low and high speed fan relays. If voltage is 10 volts or more, go to next step. Restore electrical connections. If voltage is less than 10 volts, service Black/White wire.

  3. Checking High Speed Fan Relay

    Turn ignition off. Disconnect high speed fan relay. Apply 12 volts to Black/Red and Black/White wire terminals on high speed fan relay. Measure voltage at Red wire terminal on relay. Voltage of 10 volts or greater should be present. Ground Blue/Green wire terminal. Check voltage at Blue/Black wire terminal. Voltage of 10 volts or greater should be present. Replace relay if it fails any of these tests. If relay tests okay, go to next step.

  4. Checking System Wiring

    Disconnect high speed fan relay connector and cooling fan connector. Measure resistance of Blue/Black wire between high speed fan relay connector and cooling fan motor connector. If resistance is 5 ohms or greater, service Blue/Black wire. If resistance is less than 5 ohms, check Blue/Black wire for continuity to ground. Resistance should exceed 10,000 ohms. Locate short and service wire if necessary. If wire is okay, check cooling fan Black wire for good ground. Resistance should be 5 ohms or less.

  5. Check cooling fan operation

    If fan is still inoperative and all previous tests check okay, replace cooling fan. If fan operates only on low speed, check continuity of Red wire between low speed and high speed fan relay. Service Red wire if necessary. If Red wire is okay, go to next step.

  6. Checking Low Speed Fan Relay

    Turn ignition off. Disconnect low speed fan relay. Apply 12 volts to Black/White wire terminal and Red wire terminal on low speed fan relay. Apply ground to Blue/Orange wire terminal. Measure voltage at Blue/Yellow wire terminal on relay. If less than 10 volts is measured at Blue/Yellow wire terminal, replace relay. If 10 volts or more is measured at Blue/Yellow wire terminal, check continuity of Blue/Orange wire. If resistance is 5 ohms or greater, service wire. If Blue/Orange wire is okay, replace cooling fan motor.
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