Infiniti Q45. Manual - part 471

DTC P1217 ENGINE OVER TEMPERATURE

EC-523

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7. 

CHECK COOLING FAN HIGH SPEED OPERATION

 Without CONSULT-II

1.

Turn ignition switch OFF.

2.

Reconnect cooling fan relay-3.

3.

Turn air conditioner switch and blower fan switch OFF.

4.

Disconnect 200

Ω

 resistor then connect 150

Ω

 resistor to engine

coolant temperature sensor harness connector.

5.

Restart engine and make sure that cooling fan-2 operates at
higher speed than middle speed.

OK or NG

OK

>> GO TO 8.

NG

>> Check cooling fan high speed control circuit. (Go to 

EC-

530, "PROCEDURE C"

 .)

8. 

CHECK COOLING SYSTEM FOR LEAK

Apply pressure to the cooling system with a tester, and check if the
pressure drops.

CAUTION:

Higher than the specified pressure may cause radiator damage.
Pressure should not drop.

OK or NG

OK

>> GO TO 9.

NG

>> Check the following for leak

●

Hose

●

Radiator

●

Water pump
Refer to 

CO-20, "WATER PUMP"

 .

9. 

CHECK RADIATOR CAP

Apply pressure to cap with a tester.

OK or NG

OK

>> GO TO 10.

NG

>> Replace radiator cap.

10. 

CHECK COMPONENT PARTS

Check the following.

●

Thermostat (Refer to 

CO-22, "THERMOSTAT AND WATER CONTROL VALVE"

 .)

●

Water control valve (Refer to 

CO-22, "THERMOSTAT AND WATER CONTROL VALVE"

 .)

●

Engine coolant temperature sensor (Refer to 

EC-219, "Component Inspection"

 .)

OK or NG

OK

>> GO TO 11.

NG

>> Replace malfunctioning component.

MEC475B

Testing pressure:

157 kPa (1.6 kg/cm

2

 , 23 psi)

SLC754A

Radiator cap relief pressure

: 59 - 98 kPa (0.6 - 1.0 kg/

cm

2

 , 9 - 14 psi)

SLC755A

EC-524

DTC P1217 ENGINE OVER TEMPERATURE

11. 

CHECK MAIN 13 CAUSES

If the cause cannot be isolated, go to 

EC-532, "Main 13 Causes of Overheating"

 .

>> INSPECTION END

DTC P1217 ENGINE OVER TEMPERATURE

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PROCEDURE A

1. 

CHECK COOLING FAN MOTOR POWER SUPPLY CIRCUIT-I

1.

Turn ignition switch OFF.

2.

Disconnect cooling fan relay-2.

3.

Turn ignition switch ON.

4.

Check voltage between cooling fan relay-2 terminal 2 and
ground with CONSULT-II or tester.

OK or NG

OK

>> GO TO 3.

NG

>> GO TO 2.

2. 

DETECT MALFUNCTIONING PART

Check the following.

●

10A fuse

●

Fuse, fusible link and relay block (J/B) connector E3

●

Harness for open or short between cooling fan relay-2 and fuse

>> Repair open circuit or short to ground or short to power in harness or connectors.

PBIB2428E

Voltage: Battery voltage

PBIB2450E

EC-526

DTC P1217 ENGINE OVER TEMPERATURE

3. 

CHECK COOLING FAN MOTOR POWER SUPPLY CIRCUIT-II

1.

Turn ignition switch OFF.

2.

Disconnect cooling fan motor-2 harness connector.

3.

Check voltage between cooling fan motor-2 terminals 1, 2 and
ground with CONSULT-II or tester.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

4. 

DETECT MALFUNCTIONING PART

Check the following.

●

40A fusible link

●

Harness for open or short between cooling fan motor-2 and battery

>> Repair open circuit or short to ground or short to power in harness or connectors.

5. 

CHECK COOLING FAN MOTOR CONTROL CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect cooling fan motor-1 harness connector.

3.

Check harness continuity between the following terminals.
cooling fan motor-2 terminal 4 and cooling fan relay-2 terminal 3,
cooling fan relay-2 terminal 5 and cooling fan motor-1 terminal 2,
cooling fan motor-1 terminal 3 and ground,
cooling fan motor-1 terminal 4 and ground.
Refer to Wiring Diagram.

4.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 6.

NG

>> Repair open circuit or short to ground or short to power in harness or connectors.

PBIB2426E

Voltage: Battery voltage

PBIB1670E

Continuity should exist.

PBIB2426E