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Home >> Nissan-Datsun >> 1993 >> Sentra SE-R, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Miscellaneous Controls >> Radiator Cooling Fans (Except 240SX) >> Radiator (Cooling) Fan Low Speed Control Test (Quest)

Radiator (Cooling) Fan Low Speed Control Test (Quest)

  1. Turn ignition off. Disconnect radiator fan relay No. 1. See Fig 1 and Fig 2 . Turn ignition on. Measure voltage between ground and radiator fan relay No. 1 harness connector terminals No. 2 (Blue wire) and No. 3 (Blue/Yellow wire). See Fig 1 and Fig 2 . 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 120-amp and 65-amp fusible link located in fusible link and fuse box next to battery. Replace fusible link(s) as necessary. If fuse and fusible links are okay, repair open in appropriate harness or connectors.
  3. Turn ignition off. Disconnect radiator fan motor harness connectors. Check continuity between radiator fan motor harness connector terminal "b" (Blue/White wire) and radiator fan relay No. 1 harness connector terminal No. 5 (Blue/White wire). Check continuity between radiator fan motor harness connector terminal "c" (Black wire) and ground. See Fig 1 and Fig 2 . 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 in appropriate wire or connector.
  4. Disconnect ECM harness connector. ECM is located behind glove box. Check continuity between ECM harness connector terminal No. 9 (Blue/Orange wire) and radiator fan relay No. 1 harness connector terminal No. 1 (Blue/Orange wire). See Figure , Figure and Fig 1 and Fig 2 . Continuity should exist. If continuity exists, go to next step. If continuity does not exist, repair open in Blue/Orange wire or connectors between ECM and relay.
  5. Check radiator fan relay No. 1. See RELAYS under RELAYS & SOLENOIDS  . Replace relay as necessary. If relay is okay, check fan motors. See RADIATOR FAN MOTOR TEST. Replace motor as necessary. If fan motor is okay, check ECM and ECM harness connector for damage, corrosion or improper connection. Repair as necessary.
Fig 1: Radiator Fan Relays (Quest)
G93D80195Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 2: Testing Radiator Fan Low Speed Circuit (Quest)
G93E80196Courtesy of NISSAN MOTOR CO., U.S.A.
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