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Radiator (Cooling) Fan Low Speed Control Test

  1. Turn ignition off. Disconnect radiator fan relay No. 2. Turn ignition on. Measure voltage between ground and radiator fan relay No. 2 harness connector terminals No. 2 (Blue/Orange wire) and No. 5 (Black/White wire). Battery voltage should be present. If battery voltage is present, go to step 3).
  2. If battery voltage is not present, check 7.5-amp fuse and 30-amp fusible link. Replace fuse or fusible link as necessary. If fuse and fusible links are okay, repair open harness or connectors between relay and ignition switch or battery.
  3. Turn ignition off. Disconnect radiator fan motor and radiator fan relay No. 2 harness connectors. Check continuity between radiator fan motor harness connector terminal No. 1 (White/Red wire) and radiator fan relay No. 2 harness connector terminal No. 3 (White/Red wire).
  4. Also check continuity between radiator fan motor harness connector terminals No. 3 and 4 (Black wires) and ground. Continuity should exist in all checks. If continuity exists in all checks, go to next step. If continuity does not exist in any check, repair open harness or connector.
  5. Disconnect ECM harness connector. ECM is located on right kick panel. Check continuity between ECM harness connector terminal No. 14 (Light Green wire) and radiator fan relay No. 2 harness connector terminal No. 1 (Light Green wire). Continuity should exist. If continuity exists, go to next step. If continuity does not exist, repair open harness or connectors.
  6. Check radiator fan relay No. 2. See RELAYS  under RELAYS & SOLENOIDS. Replace relay as necessary. If relay is okay, check fan motor. See RADIATOR FAN MOTOR TEST  . Replace motor as necessary. If fan motor is okay, check ECM terminals, harness, and connector terminals for damage, corrosion or improper connection. Repair or replace as necessary.
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