Nissan Primera P11. Instruction — part 96
YEC805
BATTERY
IGNITION SWITCH
ON or START
FUSE
BLOCK
(J/B)
Refer to EL-POWER.
: Detectable line for DTC
: Non-detectable line for DTC
COOLING
FAN
RELAY-3
COOLING
FAN
RELAY-2
COOLING
FAN
RELAY-1
COOLING
FAN
MOTOR-1
LOW
HIGH
TRIPLE-
PRESSURE
SWITCH
COOLING
FAN
MOTOR-2
ECM
REFER TO THE FOLLOWING
FUSE BLOCK - Junction Box (J/B)
TROUBLE DIAGNOSIS 8
CD20T
Cooling Fan (Overheat) (Cont’d)
EC-89
DIAGNOSTIC PROCEDURE
INSPECTION START
CHECK COOLING FAN LOW
SPEED OPERATION.
1. Disconnect cooling fan relay-3.
2. Turn ignition switch to “ON”
position.
3. Perform “COOLING FAN”
in “ACTIVE TEST” mode
with CONSULT-II.
------------------------------------------------------------------------------------------------------------------------- OR -------------------------------------------------------------------------------------------------------------------------
2. Start engine.
3. Set temperature switch at
full cold position.
4. Turn Air Conditioner switch
to “ON” position.
5. Turn blower fan switch to
“ON” position.
6. Run engine at idle speed
for a few minutes with Air
Conditioner operating.
7. Make sure that both cool-
ing fans operate at low
speed.
OK
E
NG
Check cooling fan low
speed control circuit.
(Go to PROCEDURE A .)
CHECK COOLING FAN HIGH
SPEED OPERATION.
1. Turn ignition switch to “LOCK”
position.
2. Reconnect cooling fan relay-3.
3. Disconnect cooling fan relay-1.
4. Turn ignition switch to “ON”
position.
5. Perform “COOLING FAN”
in “ACTIVE TEST” mode
with CONSULT-II.
------------------------------------------------------------------------------------------------------------------------- OR -------------------------------------------------------------------------------------------------------------------------
4. Turn Air Conditioner switch
and blower fan switch to
“OFF” position.
5. Disconnect engine coolant
temperature sensor har-
ness connector.
6. Connect 150
Ω
resistor to
engine coolant temperature
sensor harness connector.
7. Restart engine and make
sure that both cooling fans
operate at higher speed
than low speed.
OK
E
NG
Check cooling fan high
speed control circuit.
(Go to PROCEDURE B .)
p
B
(Go to EC-CD-94.)
.
Cooling fan relay 2
Cooling fan relay-1
Cooling fan relay-3
YEC383
SEF111X
NEF809
Cooling fan
SEF111X
YEC384
Cooling fan
Engine coolant
temperature sensor
harness connector
resistor
H
H
H
TROUBLE DIAGNOSIS 8
CD20T
Cooling Fan (Overheat) (Cont’d)
EC-90
PROCEDURE A
INSPECTION START
CHECK POWER SUPPLY.
1. Turn ignition switch to “LOCK” posi-
tion.
2. Disconnect cooling fan relay-1 and
fan motor-1 connector.
3. Turn ignition switch to “ON” position.
4. Check voltage between cooling fan
motor-1 connector terminal
p
1
, fan
relay-1 connector terminal
p
1
and
ground.
Voltage: Battery voltage
OK
E
NG
Check the following:
●
10A fuse
●
40A, 100A, fusible
links
●
Harness for open or
short-circuit between
cooling fan motor-1
and battery.
●
Harness for open or
short-circuit between
cooling fan relay-1 and
fuse.
If NG, replace fuse or
fusible links or repair har-
ness or connectors.
CHECK GROUND CIRCUIT.
1. Turn ignition switch to “LOCK” posi-
tion.
2. Disconnect cooling fan relay-2 and
fan motor-2 harness connector.
3. Check harness continuity
between cooling fan relay-1 con-
nector terminal
p
5
and cooling
fan relay-2 connector terminal
p
4
; cooling fan motor-1 con-
nector terminal
p
2
and cooling
fan relay-2 connector terminal
p
3
.
Continuity should exist.
If OK, check harness for short-
circuit.
4. Check harness continuity
between cooling fan motor-2
connector terminal
p
1
and
cooling fan relay-1 connector
terminal
p
3
; cooling fan
motor-2 connector terminal
p
2
and ground.
Continuity should
exist.
If OK, check harness for short-
circuit.
OK
E
NG
Repair harness or con-
nectors.
p
C
YEC385
Cooling fan relay-1
connector
Cooling fan motor-1
connector
NEF416
.
Under the vehicle
A/C compressor
.
Cooling fan motor-1
harness connector
NEF417
.
Radiator
lower hose
.
Cooling fan
motor-2
harness
connector
.
Under the vehicle
YEC386
Cooling fan relay-2
connector
Cooling fan motor-1
connector
Cooling fan
relay-1 con-
nector
YEC387
Cooling fan
relay-1 connector
Cooling fan motor-2
connector
H
H
H
TROUBLE DIAGNOSIS 8
CD20T
Cooling Fan (Overheat) (Cont’d)
EC-91
p
C
CHECK OUTPUT SIGNAL CIRCUIT.
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM
terminal
219
and cooling fan relay-1 con-
nector terminal
p
2
.
Continuity should exist.
If OK, check harness for short-circuit.
OK
E
NG
Check the following:
●
Harness connectors
E43
,
F2
●
Harness for open or short-
circuit between cooling fan
relay-1 and ECM
If NG, repair harness or con-
nectors.
CHECK COMPONENT
(Cooling fan relay-1, 2).
Refer to “COMPONENT INSPECTION”,
EC-CD-96.
OK
E
NG
Replace cooling fan relay.
CHECK COMPONENT
(Cooling fan motors).
Refer to “COMPONENT INSPECTION”,
EC-CD-96.
OK
E
NG
Replace cooling fan motors.
Disconnect and reconnect harness connec-
tors in the circuit. Then retest.
Trouble is not fixed.
Check ECM pin terminals for damage and
check the connection of ECM harness con-
nector. Reconnect ECM harness connector
and retest.
INSPECTION END
PROCEDURE B
INSPECTION START
CHECK POWER SUPPLY.
1. Turn ignition switch to “LOCK” position.
2. Disconnect cooling fan relay-2, 3 and
cooling fan motor-1.
3. Turn ignition switch to “ON” position.
4. Check voltage between cooling fan
motor-1 connector terminal
p
1
; cooling
fan relay-2 connector terminal
p
1
; cool-
ing fan relay-3 connector terminals
p
1
&
p
3
and ground.
Voltage: Battery voltage
OK
E
NG
Check the following:
●
10A-fuse
●
40A, 50A, 100A fusible
links
●
Harness for open or
short-circuit between fan
motor-1, fan relay-3 and
fusible link or fan relay-2,
3 and fuse.
If NG, replace fuse or fus-
ible link or repair harness or
connectors.
p
D
NEF207A
Cooling fan relay-1
connector
NEF203A
Cooling fan
relay-2
connector
Cooling fan
motor-1
connector
Cooling fan
relay-3
connector
H
H
H
H
H
H
H
H
TROUBLE DIAGNOSIS 8
CD20T
Cooling Fan (Overheat) (Cont’d)
EC-92
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