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Home >> Nissan-Datsun >> 1995 >> Maxima GLE, RE4F04A >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests 3.0L >> Miscellaneous Controls >> Radiator (Cooling) Fan High Speed Control Test
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Radiator (Cooling) Fan High Speed Control Test

  1. Turn ignition off. Disconnect radiator fan relay No. 2 and No. 3. Turn ignition on. Measure voltage between ground and radiator fan relay No. 2 and No. 3 harness connector terminals No. 1 (White/Red wire). Battery voltage should be present. If battery voltage is present, go to step 3). If battery voltage is not present, go to next step.
  2. Check 10-amp fuse located in fuse box under left instrument panel. Replace fuse as necessary. Check 30-amp fusible links located in fusible link and fuse box at engine side of battery. Replace fusible link(s) as necessary. If fuse and fusible links are okay, repair open harness or connectors.
  3. Turn ignition off. Disconnect radiator fan motor No. 1 and radiator fan motor No. 2 harness connectors. Check continuity between radiator fan motor No. 1 harness connector terminal No. 2 (White/Blue wire) and radiator fan relay No. 2 harness connector terminal No. 5 (White/Blue wire). Check continuity between radiator fan motor No. 1 harness connector terminal No. 3 (White/Red wire) and radiator fan relay No. 2 harness connector terminal No. 6 (White/Red wire).
  4. Check continuity between radiator fan motor No. 2 harness connector terminal No. 2 (White/Blue wire) and radiator fan relay No. 3 harness connector terminal No. 5 (White/Blue wire). Check continuity between radiator fan motor No. 2 harness connector terminal No. 3 (White/Red wire) and radiator fan relay No. 3 harness connector terminal No. 6 (White/Red wire).
  5. Check continuity between radiator fan relay No. 2 and No. 3 harness connector terminals No. 7 (Black wire) 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 connectors.
  6. Disconnect ECM harness connector. ECM is located under center of instrument panel (connector is on passenger's side). Check continuity between ECM harness connector terminal No. 13 (Light Green wire) and radiator fan relays No. 2 and No. 3 harness connector terminal No. 2 (Light Green wire). Continuity should exist. If continuity exists, go to next step. If continuity does not exist, repair open harness or connectors.
  7. Check radiator fan relays No. 2 and No. 3. See RELAYS  under RELAYS & SOLENOIDS. Replace relay(s) as necessary. If relays are okay, check fan motor(s). See RADIATOR FAN MOTOR TEST  . Replace motor(s) as necessary. If fan motors are okay, check ECM terminals, harness, and connector terminals for damage, corrosion or improper connection. Repair or replace as necessary.
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