Nissan Primera P11. Manual — part 97
p
D
CHECK GROUND CIRCUIT.
1. Turn ignition switch to “LOCK” position.
2. Disconnect cooling fan motor-2 harness
connector.
3. Check harness continuity between
cooling fan motor-1 connector termi-
nal
p
2
and cooling fan relay-2 con-
nector terminal
p
3
; cooling fan
motor-2 connector terminal
p
1
and
cooling fan relay-3 connector termi-
nal
p
5
; cooling fan relay-2 connec-
tor terminal
p
5
and ground.
Continuity should exist.
If OK, check harness for short-circuit.
4. Check harness continuity between
cooling fan motor-2 terminal
p
2
and
ground.
OK
E
NG
Repair harness or connec-
tors.
CHECK OUTPUT SIGNAL CIRCUIT.
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM
terminal
220
and cooling fan relay-3
connector terminal
p
2
& cooling fan
relay-2 connector 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-2, 3 and
ECM.
If NG, repair harness or
connectors.
CHECK COMPONENT
(Cooling fan relay-2, 3).
Refer to “COMPONENT INSPECTION”, EC-
CD-96.
OK
E
NG
Replace cooling fan relays.
CHECK COMPONENTS
(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
NEF876
Cooling fan motor-1
connector
Cooling fan relay-2
connector
Cooling fan
motor-2
connector
Cooling fan relay-3
connector
YEC389
Cooling fan motor-2
connector
E18
NEF204A
Cooling fan
relay-3
connector
Cooling fan
relay-2
connector
H
H
H
H
H
H
H
TROUBLE DIAGNOSIS 8
CD20T
Cooling Fan (Overheat) (Cont’d)
EC-93
p
B
CHECK COOLING SYSTEM FOR LEAK.
Apply pressure to the cooling system with a
tester, and check if the pressure drops.
Testing pressure:
157kPa (1.57 bar, 1.6 kg/cm
2
, 23 psi)
Pressure should not drop.
CAUTION:
Higher than the specified pressure may
cause radiator damage.
OK
E
NG
Check the following
for leaks:
●
Hose
●
Radiator
●
Water pump
Refer to LC section
(“Water Pump”).
CHECK RADIATOR CAP.
Apply pressure to cap with a tester.
Radiator cap relief pressure:
Standard
78 - 98 kPa (0.78 - 0.98 bar,
0.8 - 1.0 kg/cm
2
, 11 - 14 psi)
Limit
59 - 88 kPa (0.59 - 0.88 bar,
0.6 - 0.9 kg/cm
2
, 9 - 13 psi)
OK
E
NG
Replace radiator
cap.
CHECK THERMOSTAT.
1. Check valve seating condition at normal
room temperatures.
It should seat tightly.
2. Check valve opening temperature and
maximum valve lift.
Valve opening temperature:
76.5°C (170°F) [standard]
Maximum valve lift:
More than 8 mm/90°C
(0.31 in/194°F)
3. Check if valve is closed at 5°C (9°F)
below valve opening temperature.
For details, refer to LC section
(“Thermostat”).
OK
E
NG
Replace thermostat.
Check engine coolant temperature sensor.
Refer to “COMPONENT INSPECTION”,
EC-69.
OK
E
NG
Replace engine cool-
ant temperature sen-
sor.
If the cause can not be isolated, go to “12
MAIN CAUSES OF OVERHEATING” on
next page.
INSPECTION END
Perform FINAL CHECK by the following procedure after
repair is completed.
1. Warm up engine. Run the vehicle for at least 20 minutes. Pay
attention to engine coolant temperature gauge on the instru-
ment panel. If the reading shows an abnormally high
temperature, another part may be malfunctioning.
2. Stop vehicle and let engine idle. Check the intake and
exhaust systems for leaks by listening for noise or visually
inspecting the components.
3. Allow engine to cool and visually check for oil and coolant
leaks. Then, perform “OVERALL FUNCTION CHECK”.
Hose adapter
.
SLC754AA
SLC755AA
SLC343
H
H
H
H
H
H
TROUBLE DIAGNOSIS 8
CD20T
Cooling Fan (Overheat) (Cont’d)
EC-94
12 MAIN CAUSES OF OVERHEATING
Engine
Step
Inspection item
Equipment
Standard
Reference page
OFF
1
●
Blocked radiator
●
Blocked condenser
●
Blocked radiator grille
●
Blocked bumper
●
Visual
No blocking
−
2
●
Coolant mixture
●
Coolant tester
50 - 50% coolant mix-
ture
See “RECOMMENDED
FLUIDS AND LUBRI-
CANTS” in MA section.
3
●
Coolant level
●
Visual
Coolant up to MAX level
in reservoir tank and
radiator filler neck
See “Changing Engine
Coolant”, “ENGINE
MAINTENANCE” in MA
section.
4
●
Radiator cap
●
Pressure tester
78 - 98 kPa
(0.78 - 0.98 bar, 0.8 -
1.0 kg/cm
2
, 11 - 14 psi)
59 - 98 kPa
(0.59 - 0.98 bar, 0.6 -
1.0 kg/cm
2
, 9 - 14 psi)
(Limit)
See “System Check”
“ENGINE COOLING
SYSTEM” in LC section.
ON*2
5
●
Coolant leaks
●
Visual
No leaks
See “System Check”
“ENGINE COOLING
SYSTEM” in LC section.
ON*2
6
●
Thermostat
●
Touch the upper and
lower radiator hoses
Both hoses should be
hot
See “Thermostat” and
“Radiator”, “ENGINE
COOLING SYSTEM” in
LC section.
ON*1
7
●
Cooling fan
●
CONSULT
Operating
See “TROUBLE DIAG-
NOSIS 8”.
OFF
8
●
Combustion gas leak
●
Color checker
chemical tester
4 Gas analyzer
Negative
−
ON*3
9
●
Coolant temperature
gauge
●
Visual
Gauge less than 3/4
when driving
−
●
Coolant overflow to
reservoir tank
●
Visual
No overflow during driv-
ing and idling
See “Changing Engine
Coolant”, “ENGINE
MAINTENANCE” in MA
section.
OFF*4
10
●
Coolant return from
reservoir tank to
radiator
●
Visual
Should be initial level in
reservoir tank
See “ENGINE MAINTE-
NANCE” in MA section.
OFF
11
●
Cylinder head
●
Straight gauge feeler
gauge
0.1 mm (0.004 in) Maxi-
mum distortion (warping)
See “Inspection”, “CYL-
INDER HEAD” in EM
section.
12
●
Cylinder block and
pistons
●
Visual
No scuffing on cylinder
walls or piston
See “Inspection”, “CYL-
INDER BLOCK” in EM
section.
*1: Turn the ignition switch ON.
*2: Engine running at 3,000 rpm for 10 minutes.
*3: Drive at 90 km/h (55 mph) for 30 minutes and then let idle for 10 minutes.
*4: After 60 minutes of cool down time.
For more information, refer to “OVERHEATING CAUSE ANALYSIS” in LC section.
TROUBLE DIAGNOSIS 8
CD20T
Cooling Fan (Overheat) (Cont’d)
EC-95
COMPONENT INSPECTION
Cooling fan relays-1, -2, -3
Check continuity between terminals
p
3
and
p
5
.
Conditions
Continuity
12V direct current supply between relay
terminals
p
1
and
p
2
Yes
No current supply
No
If NG, replace cooling fan relay.
Cooling fan relay-2
Check continuity between terminals
p
3
and
p
4
.
Conditions
Continuity
No current supply
Yes
12V direct current supply between relay
terminals
p
1
and
p
2
No
Cooling fan motors-1 and -2
1. Disconnect cooling fan motor harness connectors.
2. Supply cooling fan motor terminals with battery voltage and
check operation.
Terminals
(
!
)
(
@
)
Cooling fan motor-1 and -2
p
1
p
2
Cooling fan motor should operate.
If NG, replace cooling fan motor.
3
5
1
2
3
5
1
4
2
3
5
1
4
2
YEC391
Cooling fan relay 1
Cooling fan relay 3
Cooling fan relay 2
AEC781
FUSE
Cooling fan
motor-1 & -2
TROUBLE DIAGNOSIS 8
CD20T
Cooling Fan (Overheat) (Cont’d)
EC-96
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