Cooling Fan Control Circuit

CHECK IPDM E/R POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R harness connector E123.
3. Check voltage between IPDM E/R terminal 15 and ground with CONSULT-III or tester.
  Voltage: Battery voltage
OK or NG

OK: GO TO 3.

NG: GO TO 2.

Fig 1: Checking Voltage Between IPDM E/R Terminal 15 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
DETECT MALFUNCTIONING PART
Check the following.
- 40A fusible link
- Harness for open or short between IPDM E/R and battery
  : Repair open circuit or short to ground or short to power in harness or connectors.
CHECK IPDM E/R GROUND CIRCUIT FOR OPEN AND SHORT
1. Disconnect IPDM E/R harness connector E121, E123 and E124.
2. Check harness continuity between IPDM E/R terminal 16, 38, 60 and ground.
  Refer to WIRING DIAGRAM .
  
  Continuity should exist.
3. Also check harness for short to power.
OK or NG

OK: GO TO 4.

NG: Repair open circuit or short to power in harness or connectors.
CHECK COOLING FAN MOTOR-2 CIRCUIT FOR OPEN AND SHORT-I
1. Disconnect cooling fan motor-2 harness connector.
  
  Fig 2: Identifying Cooling Fan Motor-2 Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
2. Check voltage between cooling fan motor-2 terminals 1, 2 and ground with CONSULT-III or tester.
  Voltage: Battery voltage
OK or NG

OK: GO TO 6.

NG: GO TO 5.

Fig 3: Checking Voltage Between Cooling Fan Motor-1 Terminals 1, 2 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
DETECT MALFUNCTIONING PART
Check the following.
- 40A fusible link
- Harness for open or short between cooling fan motor-2 and battery
  : Repair open circuit or short to ground or short to power in harness or connectors.
CHECK COOLING FAN MOTOR-2 CIRCUIT FOR OPEN AND SHORT-II
1. Disconnect IPDM E/R harness connector E118.
2. Check harness continuity between the following terminals.
  Cooling fan motor-2 terminal 3 and IPDM E/R terminal 8,
  
  Cooling fan motor-2 terminal 4 and IPDM E/R terminals 11, 12. Refer to WIRING DIAGRAM .
  
  Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG

OK: GO TO 7.

NG: Repair open circuit or short to ground or short to power in harness or connectors.
CHECK COOLING FAN MOTOR-1 CIRCUIT FOR OPEN AND SHORT-I
1. Disconnect cooling fan motor-1 harness connector.
2. Check harness continuity between cooling fan motor-1 terminals 3, 4 and ground.
  Refer to WIRING DIAGRAM .
  
  Continuity should exist.
3. Also check harness for short to power.
OK or NG

OK: GO TO 8.

NG: Repair open circuit or short to power in harness or connectors.

Fig 4: Identifying Cooling Fan Motor-1 Connector
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK COOLING FAN MOTOR-1 CIRCUIT FOR OPEN AND SHORT-II
1. Check harness continuity between the following terminals.
  Cooling fan motor-1 terminal 1 and IPDM E/R terminal 10, 14,
  
  Cooling fan motor-1 terminal 2 and IPDM E/R terminal 13.
  
  Refer to WIRING DIAGRAM .
  
  Continuity should exist.
2. Also check harness for short to ground and short to power.
OK or NG

OK: GO TO 9.

NG: Repair open circuit or short to ground or short to power in harness or connectors.
CHECK COOLING FAN MOTORS
Refer to "COMPONENT INSPECTION ".

OK or NG

OK: GO TO 10.

NG: Replace cooling fan motors.
CHECK INTERMITTENT INCIDENT
Perform "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

OK or NG

OK: Replace IPDM E/R. Refer to "IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM) ".

NG: Repair or replace harness or connector.