Radiator (Cooling) Fan High Speed Control Test (Altima)
- Turn ignition off. Disconnect radiator fan relay No. 2 and No. 3. See Fig 1
-Fig 3
. Turn ignition on. Measure voltage between ground and radiator fan relay No. 2 and No. 3 harness connector terminals No. 1 (Green/Yellow wire) and No. 3 (White/Green wire). See Fig 1
-Fig 3
. Battery voltage should be present. If battery voltage is present, go to step 3). If battery voltage is not present, go to next step.
- Check 10-amp fuse located in fuse box under left instrument panel. Replace fuse as necessary. Check 30-amp and 75-amp fusible links located in fusible link and fuse box left of battery. Replace fusible link(s) as necessary. If fuse and fusible links are okay, repair open in harness or connectors.
- 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" (White/Yellow wire) and radiator fan relay No. 2 harness connector terminal No. 5 (White/Yellow wire). Check continuity between radiator fan motor No. 2 harness connector terminal "f" (White/Blue wire) and radiator fan relay No. 3 harness connector terminal No. 5 (White/Blue wire). See Fig 1
-Fig 3
.
- Check continuity between radiator fan motor No. 1 harness connector terminal "c" (White/Green wire) and radiator fan relay No. 2 harness connector No. 6 (White/Green wire). Check continuity between radiator fan motor No. 2 harness connector terminal "g" (White/Red wire) and radiator fan relay No. 2 harness connector No. 6 (White/Red wire). Check continuity between radiator fan relay No. 2 and No. 3 harness connector terminal No. 7 (Black wire) and ground. Refer to Fig 1
-Fig 3
. 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.
- 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. 10 (Light Green wire) and radiator fan relays No. 2 and No. 3 harness connector terminal No. 2 (Light Green wire). See Figure
, Figure
and Fig 1
-Fig 3
. Continuity should exist. If continuity exists, go to next step. If continuity does not exist, repair open in Light Green wire or connectors between ECM and relays.
- 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.
Courtesy of NISSAN MOTOR CO., U.S.A.
Courtesy of NISSAN MOTOR CO., U.S.A.
Courtesy of NISSAN MOTOR CO., U.S.A.