Nissan Terrano r20e. Manual — part 120
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10
CHECK COOLING FAN RELAY
Check continuity between cooling fan relay terminals 3 and 5 under the following conditions.
MEC975D
MTBL1319
OK or NG
OK
E
GO TO 11.
NG
E
Replace cooling fan relay.
11
CHECK COOLING FAN MOTOR
Supply battery voltage between cooling fan motor terminals 1 and 2.
MEC976D
Does the cooling fan motor operate normally?
OK or NG
OK
E
GO TO 12.
NG
E
Replace cooling fan motor.
12
CHECK INTERMITTENT INCIDENT
Perform “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-78.
E
INSPECTION END
DTC 0208 OVER HEAT
ZD30DDTi
Diagnostic Procedure (Cont’d)
EC-117
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13
CHECK COOLING SYSTEM FOR LEAK
Apply pressure to the cooling system with a tester, and check if the pressure drops.
Testing pressure: 157 kPa (1.57 bar, 1.6 kg/cm
2
, 23 psi)
CAUTION:
Higher than the specified pressure may cause radiator damage.
SLC754A
Pressure should not drop.
OK or NG
OK
E
GO TO 15.
NG
E
GO TO 14.
14
DETECT MALFUNCTIONING PART
Check the following for leak.
I
Hose
I
Radiator
I
Water pump (Refer to LC section, “Water Pump”.)
E
Repair or replace.
15
CHECK RADIATOR CAP
Apply pressure to cap with a tester and check radiator cap relief pressure.
SLC755A
Radiator cap relief pressure:
79 - 98 kPa (0.78 - 0.98 bar, 0.8 - 1.0 kg/cm
2
, 11 - 14 psi)
OK or NG
OK
E
GO TO 16.
NG
E
Replace radiator cap.
DTC 0208 OVER HEAT
ZD30DDTi
Diagnostic Procedure (Cont’d)
EC-118
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16
CHECK THERMOSTAT
1. Remove thermostat.
2. Check valve seating condition at normal room temperatures.
It should seat tightly.
3. Check valve opening temperature and valve lift.
SLC343
Valve opening temperature:
82°C (180°F) [standard] (Models for cold areas)
76.5°C (170°F) [standard] (Models for except cold areas)
Valve lift:
More than 10 mm/95°C (0.394 in/203°F)
4. Check if valve is closed at 5°C (9°F) below valve opening temperature. For details, refer to LC section, “Thermostat”.
OK or NG
OK
E
GO TO 17.
NG
E
Replace thermostat.
17
CHECK ENGINE COOLANT TEMPERATURE SENSOR
1. Remove engine coolant temperature sensor.
2. Check resistance between engine coolant temperature sensor terminals 1 and 2 as shown in the figure.
SEF304X
OK or NG
OK
E
GO TO 18.
NG
E
Replace engine coolant temperature sensor.
DTC 0208 OVER HEAT
ZD30DDTi
Diagnostic Procedure (Cont’d)
EC-119
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18
CHECK MAIN 12 CAUSES
If the cause cannot be isolated, go to “MAIN 12 CAUSES OF OVERHEATING”, EC-120.
E
INSPECTION END
Main 12 Causes of Overheating
Engine
Step
Inspection item
Equipment
Standard
Reference page
OFF
1
I
Blocked radiator
I
Blocked condenser
I
Blocked radiator grille
I
Blocked bumper
I
Visual
No blocking
—
2
I
Coolant mixture
I
Coolant tester
30 - 50% coolant mixture
See “RECOMMENDED
FLUIDS AND LUBRI-
CANTS” in MA section.
3
I
Coolant level
I
Visual
Coolant up to MAX level
in reservoir tank and
radiator filler neck
See “Changing Engine
Coolant”, “ENGINE MAIN-
TENANCE” in MA section.
4
I
Radiator cap
I
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 SYS-
TEM” in LC section.
ON*2
5
I
Coolant leaks
I
Visual
No leaks
See “System Check”,
“ENGINE COOLING SYS-
TEM” in LC section.
ON*2
6
I
Thermostat
I
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
I
Cooling fan
I
Visual
Operating
See “DTC 0208 OVER
HEAT”, EC-109.
OFF
8
I
Combustion gas leak
I
Color checker chemical
tester 4 gas analyzer
Negative
—
ON*3
9
I
Coolant temperature
gauge
I
Visual
Gauge less than 3/4
when driving
—
I
Coolant overflow to res-
ervoir tank
I
Visual
No overflow during driving
and idling
See “Changing Engine
Coolant”, “ENGINE MAIN-
TENANCE” in MA section.
OFF*4
10
I
Coolant return from res-
ervoir tank to radiator
I
Visual
Should be initial level in
reservoir tank
See “ENGINE MAINTE-
NANCE” in MA section.
OFF
11
I
Cylinder head
I
Straight gauge feeler
gauge
0.1 mm (0.004 in) Maxi-
mum distortion (warping)
See “Inspection”, “CYLIN-
DER HEAD” in EM sec-
tion.
12
I
Cylinder block and pis-
tons
I
Visual
No scuffing on cylinder
walls or piston
See “Inspection”, “CYLIN-
DER BLOCK” in EM sec-
tion.
*1: Engine running at idle.
*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.
DTC 0208 OVER HEAT
ZD30DDTi
Diagnostic Procedure (Cont’d)
EC-120
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