Procedure B

CHECK COOLING FAN POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect cooling fan relay-2 and relay-3.
3. Turn ignition switch ON.
4. Check voltage between cooling fan relay-2 and relay-3 terminals 1, 3 and ground with CONSULT-II or tester.
  
  Fig 1: Checking Voltage Between Cooling Fan Relay-2 & Relay-3 Terminals 1, 3 & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Voltage: Battery voltage
OK or NG
1. OK: GO TO 3.
2. NG: GO TO 2.
DETECT MALFUNCTIONING PART
Check the following.
- Fuse and fusible link box connectors E23, E25
- Fuse block (J/B) connector E103
- Harness for open or short between cooling fan relay-2, relay-3 and fuse
- Harness for open or short between cooling fan relay-2, relay-3 and fusible link
  Repair harness or connectors.
CHECK COOLING FAN MOTORS CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect cooling fan motor-1 harness connector and cooling fan motor-2 harness connector.
3. Check harness continuity between the following;
  cooling fan motor-1 terminal 2 and cooling fan relay-2 terminal 5,
  
  cooling fan motor-1 terminal 3 and cooling fan relay-2 terminal 6,
  
  cooling fan relay-2 terminal 7 and body ground.
  
  Refer to WIRING DIAGRAM .
  
  Continuity should exist.
  
  Fig 2: Disconnecting Cooling Fan Motor-1 & Motor-2 Harness Connectors
  Courtesy of NISSAN MOTOR CO., U.S.A.
4. Also check harness for short to ground and short to power.
5. Check harness continuity between the following;
  cooling fan motor-2 terminal 2 and cooling fan relay-3 terminal 5,
  
  cooling fan motor-2 terminal 3 and cooling fan relay-3 terminal 6,
  
  cooling fan relay-3 terminal 7 and body ground.
  
  Refer to WIRING DIAGRAM .
  
  Continuity should exist.
6. Also check harness for short to ground and short to power.
OK or NG
1. OK: GO TO 4.
2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
CHECK COOLING FAN OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 89 and cooling fan relay-2 and relay-3 terminals 2.
  Refer to WIRING DIAGRAM .
  
  Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG
1. OK: GO TO 6.
2. NG: GO TO 5.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E9, F47
- Harness for open or short between cooling fan relay-2 and ECM
- Harness for open or short between cooling fan relay-3 and ECM
  Repair open circuit or short to ground or short to power in harness or connectors.
CHECK COOLING FAN RELAY-2 AND RELAY-3
Refer to "COMPONENT INSPECTION ".

OK or NG
1. OK: GO TO 7.
2. NG: Replace cooling fan relays.
CHECK COOLING FAN MOTORS-1 AND -2
Refer to "COMPONENT INSPECTION ".

OK or NG
1. OK: GO TO 8.
2. NG: Replace cooling fan motors.
CHECK INTERMITTENT INCIDENT
Perform "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".
1. INSPECTION END