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Radiator (Cooling) Fan High Speed Control Test (2.0L A/T)

  1. Turn ignition off. Disconnect radiator fan relays No. 2 and No. 3. See Figure -Figure . Turn ignition on. Measure voltage between ground and radiator fan relays No. 2 and No. 3 harness connector terminals No. 1 (White/Green wire) and No. 3 (Black/White wire). See Figure -Figure . 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 link located in fusible link and fuse box next to battery. Check Blue in-line fusible link near battery positive terminal. 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 No. 1 and radiator fan motor No. 2 harness connectors. Check continuity between radiator fan motor No. 1 harness connector terminal "b" (Brown wire) and radiator fan relay No. 2 harness connector terminal No. 5 (Brown wire). Check continuity between radiator fan motor No. 1 harness connector terminal "c" (Red wire) and radiator fan relay No. 2 harness connector No. 7 (Red wire). Check continuity between radiator fan relay No. 2 harness connector terminal No. 6 (Black wire) and ground. See Fig 1 and Fig 2 .
  4. Check continuity between radiator fan motor No. 2 harness connector terminal "f" (Brown/White wire) and radiator fan relay No. 3 harness connector terminal No. 5 (Brown/White wire). Check continuity between radiator fan motor No. 2 harness connector terminal "g" (Red wire) and radiator fan relay No. 3 harness connector No. 7 (Red wire). Check continuity between radiator fan relay No. 3 harness connector terminal No. 6 (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.
  5. Disconnect ECM harness connector. ECM is located under center of instrument panel. Check continuity between ECM harness connector terminal No. 10 (Blue/Black wire) and radiator fan relays No. 2 and No. 3 harness connector terminal No. 2 (Blue/Black wire). See Figure and Fig 1 -Fig 2 . Continuity should exist. If continuity exists, go to next step. If continuity does not exist, repair open in Blue/Black wire or connectors between ECM and relay(s).
  6. 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 and ECM harness connector for damage, corrosion or improper connection. Repair as necessary.
Fig 1: Testing Radiator Fan High Speed Circuit - Step 3 (2.0L A/T)
G93B80193Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 2: Testing Radiator Fan High Speed Circuit - Step 4 (2.0L A/T)
G93C80194Courtesy of NISSAN MOTOR CO., U.S.A.
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