Nissan Altima L32. Instruction — part 457
COOLING FAN
EC-949
< COMPONENT DIAGNOSIS >
[QR25DE EXCEPT FOR CALIFORNIA]
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COOLING FAN
Description
INFOID:0000000004349940
The ECM controls the cooling fan corresponding to the vehicle speed, engine colant temperature, refrigerant
pressure, and air conditioner ON signal. The control system has 4-step control [HIGH/MIDDLE/LOW/OFF].
COOLING FAN MOTOR
The cooling fan operates at each speed when the current flows in the cooling fan motor as follows.
The cooling fan operates at low (LOW) speed when cooling fan motors-1 and -2 are circuited in series and
middle speed condition.
.
Component Function Check
INFOID:0000000004349941
1.
CHECK COOLING FAN FUNCTION
With CONSULT-III
1. Turn ignition switch ON.
2. Perform “COOLING FAN” in “ACTIVE TEST” mode with CONSULT-III.
3. Touch “LOW”“MID” “Hi” on the CONSULT-III screen.
4. Check that cooling fan operates.
Without CONSULT-III
1. Perform IPDM E/R auto active test and check cooling fan motors operation, refer to
.
2. Check that cooling fan operates.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Refer to
.
Diagnosis Procedure
INFOID:0000000004349942
1.
CHECK COOLING FAN RELAY POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect cooling fan relays-2, -3.
3. Turn ignition switch ON.
4. Check the voltage between cooling fan relays-2, -3 harness con-
nectors and ground.
Is the inspection result normal?
Cooling fan Speed
Cooling fan motor terminals
(+)
(–)
Middle (MID)
1
3 and 4
2
3 and 4
1 and 2
3
1 and 2
4
High (HI)
1 and 2
3 and 4
Cooling fan relay
Ground
Voltage
Connector
Terminal
E42
(cooling fan relay-2)
2
Ground
Battery voltage
5
E43
(cooling fan relay-3)
2
5
PBIB0071E
EC-950
< COMPONENT DIAGNOSIS >
[QR25DE EXCEPT FOR CALIFORNIA]
COOLING FAN
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
DETECT MALFUNCTIONING PART
Check the following.
• 10 A fuse (No. 33)
• 40 A fusible link (letter K)
• IPDM E/R harness connector E18
• Harness for open or short between cooling fan relay-2 and battery
• Harness for open or short between cooling fan relay-3 and battery
• Harness for open or short between cooling fan relay-2 and IPDM E/R
• Harness for open or short between cooling fan relay-3 and IPDM E/R
>> Repair open circuit, short to ground or short to power in harness or connectors.
3.
CHECK COOLING FAN RELAY OUTPUT SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R harness connectors.
3. Check the continuity between cooling fan relay-2, -3 harness connectors and IPDM E/R harness connec-
tor.
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> GO TO 4.
4.
DETECT MALFUNCTIONING PART
Check the following.
• Harness for open or short between cooling fan relay-2 and IPDM E/R
• Harness for open or short between cooling fan relay-3 and IPDM E/R
>> Repair open circuit, short to ground or short to power in harness or connectors.
5.
CHECK COOLING FAN MOTOR POWER SUPPLY CIRCUIT
1. Disconnect cooling fan motor-1 harness connector.
2. Check the voltage between cooling fan motor-1 harness con-
nector and ground.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> GO TO 6.
6.
DETECT MALFUNCTIONING PART
Check the following.
• 40 A fusible link (letter M)
• Harness connector E12, E203
Cooling fan relay
IPDM E/R
Continuity
Connector
Terminal
Connector
Terminal
E42
(cooling fan relay-2)
1
E17
42
Existed
E43
(cooling fan relay-3)
1
E18
34
Cooling fan motor-1
Ground
Voltage
Connector
Terminal
E220
1
Ground
Battery voltage
2
PBIB1670E
COOLING FAN
EC-951
< COMPONENT DIAGNOSIS >
[QR25DE EXCEPT FOR CALIFORNIA]
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• Harness for open or short between cooling fan motor-1 and battery
>> Repair open circuit, short to ground or short to power in harness or connectors.
7.
CHECK COOLING FAN MOTOR CIRCUIT-I
1. Disconnect cooling fan motor-2 harness connector.
2. Check the continuity between cooling fan relay-2, -3 harness connectors and cooling fan motor-1, -2 har-
ness connectors.
3. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> GO TO 8.
8.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connector E12, E203
• Harness for open or short between cooling fan motor-1 and cooling fan relay-2
• Harness for open or short between cooling fan motor-1 and cooling fan relay-3
• Harness for open or short between cooling fan motor-2 and cooling fan relay-2
• Harness for open or short between cooling fan motor-2 and cooling fan relay-3
>> Repair open circuit, short to ground or short to power in harness or connectors.
9.
CHECK COOLING FAN MOTOR CIRCUIT-II
1. Check the continuity between IPDM E/R harness connector and cooling fan motor-1, -2 harness connec-
tor.
2. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 11.
NO
>> GO TO 10.
10.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connector E12, E203
• Harness for open or short between cooling fan motor-1 and IPDM E/R
• Harness for open or short between cooling fan motor-2 and IPDM E/R
Cooling fan relay
Cooling fan motor
Continuity
Connector
Terminal
Connector
Terminal
E42
(cooling fan relay-2)
3
E221
(Cooling fan motor-2)
2
Existed
7
E220
(Cooling fan motor-1)
3
E43
(cooling fan relay-3)
3
E221
(Cooling fan motor-2)
1
7
E220
(Cooling fan motor-1)
4
IPDM E/R
Cooling fan motor
Continuity
Connector
Terminal
Connector
Terminal
E18
35
E220
(Cooling fan motor-1)
4
Existed
38
E221
(Cooling fan motor-2)
1
EC-952
< COMPONENT DIAGNOSIS >
[QR25DE EXCEPT FOR CALIFORNIA]
COOLING FAN
>> Repair open circuit, short to ground or short to power in harness or connectors.
11.
CHECK COOLING FAN MOTOR CIRCUIT-III
1. Check the continuity between cooling fan relay-2, -3 harness connectors and ground.
2. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 12.
NO
>> Repair open circuit, short to ground or short to power in harness or connectors.
12.
CHECK COOLING FAN MOTOR CIRCUIT-IV
1. Check the continuity between cooling fan motor-2 harness connector and ground.
2. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 13.
NO
>> Repair open circuit, short to ground or short to power in harness or connectors.
13.
CHECK COOLING FAN RELAY-2 AND -3
EC-953, "Component Inspection (Cooling Fan Relay)"
Is the inspection result normal?
YES
>> GO TO 14.
NO
>> Replace malfunctioning cooling fan relay.
14.
CHECK COOLING FAN MOTORS-1 AND -2
EC-952, "Component Inspection (Cooling Fan Motor)"
Is the inspection result normal?
YES
>> GO TO 15.
NO
>> Replace malfunctioning cooling fan motor.
15.
CHECK INTERMITTENT INCIDENT
Perform
GI-42, "Intermittent Incident"
.
Is the inspection result normal?
YES
>> Replace IPDM E/R.
NO
>> Repair or replace harness connectors.
Component Inspection (Cooling Fan Motor)
INFOID:0000000004349943
1.
CHECK COOLING FAN MOTOR
1. Turn ignition switch OFF.
2. Disconnect cooling fan motor harness connector.
Cooling fan motor
Ground
Continuity
Connector
Terminal
E42
(cooling fan relay-2)
6
Ground
Existed
E43
(cooling fan relay-3)
6
Cooling fan motor-2
Ground
Continuity
Connector
Terminal
E221
3
Ground
Existed
4
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