Infiniti I35 (A33). Manual — part 296
4
CHECK COOLING FAN LOW SPEED OPERATION
Without CONSULT-II
1. Disconnect cooling fan relays-2 and -3.
SEC006C
2. Start engine and let it idle.
3. Set temperature lever at full cold position.
4. Turn air conditioner switch ON.
5. Turn blower fan switch ON.
6. Make sure that cooling fans-1 and -2 operate at low speed.
SEC163BA
OK or NG
OK
©
GO TO 5.
NG
©
Check cooling fan low speed control circuit. (Go to PROCEDURE A, EC-529.)
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1217 ENGINE OVER TEMPERATURE
Diagnostic Procedure (Cont’d)
EC-525
5
CHECK COOLING FAN HIGH SPEED OPERATION
Without CONSULT-II
1. Turn ignition switch OFF.
2. Reconnect cooling fan relays-2 and -3.
3. Turn air conditioner switch and blower fan switch OFF.
4. Disconnect engine coolant temperature sensor harness connector.
5. Connect 150
Ω
resistor to engine coolant temperature sensor harness connector.
6. Restart engine and make sure that cooling fans-1 and -2 operate at high speed.
MEC475B
OK or NG
OK
©
GO TO 6.
NG
©
Check cooling fan high speed control circuit. (Go to PROCEDURE B, EC-532.)
6
CHECK COOLING SYSTEM FOR LEAK
Apply pressure to the cooling system with a tester, and check if the pressure drops.
Testing pressure: 157 kPa (1.6 kg/cm
2
, 23 psi)
CAUTION:
Higher than the specified pressure may cause radiator damage.
SLC754A
Pressure should not drop.
OK or NG
OK
©
GO TO 8.
NG
©
GO TO 7.
7
DETECT MALFUNCTIONING PART
Check the following for leak.
I
Hose
I
Radiator
I
Water pump (Refer to LC-14, “Water Pump”.)
©
Repair or replace.
DTC P1217 ENGINE OVER TEMPERATURE
Diagnostic Procedure (Cont’d)
EC-526
8
CHECK RADIATOR CAP
Apply pressure to cap with a tester and check radiator cap relief pressure.
SLC755A
Radiator cap relief pressure:
59 - 98 kPa (0.6 - 1.0 kg/cm
2
, 9 - 14 psi)
OK or NG
OK
©
GO TO 9.
NG
©
Replace radiator cap.
9
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]
Valve lift:
More than 8.6 mm/95°C (0.339 in/203°F)
4. Check if valve is closed at 5°C (9°F) below valve opening temperature. For details, refer to LC-18, “Thermostat”.
OK or NG
OK
©
GO TO 10.
NG
©
Replace thermostat.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1217 ENGINE OVER TEMPERATURE
Diagnostic Procedure (Cont’d)
EC-527
10
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
©
GO TO 11.
NG
©
Replace engine coolant temperature sensor.
11
CHECK MAIN 12 CAUSES
If the cause cannot be isolated, go to “MAIN 12 CAUSES OF OVERHEATING”, EC-534.
©
INSPECTION END
DTC P1217 ENGINE OVER TEMPERATURE
Diagnostic Procedure (Cont’d)
EC-528
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