Nissan Silvia. Instruction — part 153
7
CHECK RADIATOR CAP
Apply pressure to cap with a tester.
SLC755AE
Radiator cap relief pressure:
59 - 98 kPa (0.59 - 0.98 bar, 0.6 - 1.0 kg/cm
2
, 9 - 14 psi)
OK or NG
OK
©
GO TO 8.
NG
©
Replace radiator cap.
8
CHECK THERMOSTAT
1. Check valve seating condition at normal room temperatures.
It should seat tightly.
2. Check valve opening temperature and valve lift.
SLC343
Valve opening temperature:
76.5°C (170°F)
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-13, “Thermostat”.
OK or NG
OK
©
GO TO 9.
NG
©
Replace thermostat
9
CHECK ENGINE COOLANT TEMPERATURE SENSOR
Refer to “COMPONENT INSPECTION”, EC-109.
OK or NG
OK
©
GO TO 10.
NG
©
Replace engine coolant temperature sensor.
GI
MA
EM
LC
FE
CL
MT
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC 0208 OVERHEAT (COOLING SYSTEM)
Diagnostic Procedure (Cont’d)
EC-127
10
CHECK MAIN 12 CAUSES
If the cause cannot be isolated, go to “MAIN 12 CAUSES OF OVERHEATING”, EC-135.
©
INSPECTION END
DTC 0208 OVERHEAT (COOLING SYSTEM)
Diagnostic Procedure (Cont’d)
EC-128
PROCEDURE A
=NMEC0702S01
1
CHECK POWER SUPPLY
1. Turn ignition switch “OFF”.
2. Disconnect cooling fan relay-1.
SEC381C
3. Turn ignition switch “ON”.
4. Check voltage between cooling fan relay-1 terminals 2, 5 and ground with CONSULT-II or tester.
SEC412C
OK or NG
OK
©
GO TO 3.
NG
©
GO TO 2.
2
DETECT MALFUNCTIONING PART
Check the following.
I
10A fuse
I
40A fusible link
I
Harness for open or short between cooling fan relay-1 and fuse
I
Harness for open or short between cooling fan relay-1 and battery
©
Repair open circuit or short to ground or short to power in harness or connectors.
GI
MA
EM
LC
FE
CL
MT
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC 0208 OVERHEAT (COOLING SYSTEM)
Diagnostic Procedure (Cont’d)
EC-129
3
CHECK COOLING FAN MOTOR CIRCUIT FOR OPEN AND SHORT-I
1. Turn ignition switch “OFF”.
2. Disconnect cooling fan motor harness connector.
SEC382C
3. Check harness continuity between cooling fan relay-1 terminal 3 and cooling fan motor terminal 1, cooling fan motor
terminal 3 and body ground.
Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
OK
©
GO TO 4.
NG
©
Repair open circuit or short to ground or short to power in harness or connectors.
4
CHECK OUTPUT SIGNAL CIRCUIT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 9 and cooling fan relay-1 terminal 1.
Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG
OK
©
GO TO 6.
NG
©
GO TO 5.
5
DETECT MALFUNCTION PART
Check the following.
I
Harness connectors F4, M60
I
Harness connectors M10, E101
I
Harness for open or short between cooling fan relay-1 and ECM
©
Repair open circuit or short to ground or short to power in harness connectors.
6
CHECK COOLING FAN RELAY-1
Refer to “Component Inspection”, EC-135.
OK or NG
OK
©
GO TO 7.
NG
©
Replace cooling fan relay-1.
DTC 0208 OVERHEAT (COOLING SYSTEM)
Diagnostic Procedure (Cont’d)
EC-130
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