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