Infiniti QX56 (JA60). Manual - part 413

EC-304

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P1217 ENGINE OVER TEMPERATURE

4. Make sure that cooling fan operates.
OK or NG

OK

>> GO TO 4.

NG

>> Check cooling fan control circuit. (Go to “PROCEDURE

A”.)

4.

CHECK COOLING SYSTEM FOR LEAK

Refer to 

CO-10, "Inspection"

.

OK or NG

OK

>> GO TO 5.

NG

>> Check the following for leak.

• Hose

• Radiator

• Radiator cap

• Water pump

• Reservoir tank

5.

CHECK COMPONENT PARTS

Check the following.

• RESERVOIR TANK CAP (Refer to 

CO-10, "Inspection"

.)

• Thermostat. (Refer to 

CO-22, "Removal and Installation"

.)

• Engine coolant temperature sensor. (Refer to 

EC-123, "Component Inspection"

.)

OK or NG

OK

>> GO TO 6.

NG

>> Replace malfunctioning component.

6.

CHECK MAIN 13 CAUSES

If the cause cannot be isolated, go to 

EC-304, "Main 13 Causes of Overheating"

.

>> INSPECTION END

Main 13 Causes of Overheating

INFOID:0000000005149353

SEF882V

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 mixture

CO-10

3

• Coolant level

• Visual

Coolant up to MAX level in 
reservoir tank and radiator 
filler neck

CO-11, "Changing Engine 
Coolant"

4

• Reservoir tank cap

• Pressure tester

95 - 125 kPa
(0.97 - 1.28 kg/cm

2

, 14 - 

18 psi) (Limit)

CO-10, "Inspection"

ON*

2

5

• Coolant leaks

• Visual

No leaks

CO-10, "Inspection"

ON*

2

6

• Thermostat

• Touch the upper and 

lower radiator hoses

Both hoses should be hot

CO-22, "Removal and In-
stallation"

ON*

1

7

• Cooling fan

• CONSULT-III

Operating

See trouble diagnosis for 
DTC P1217 (

EC-36

).

P1217 ENGINE OVER TEMPERATURE

EC-305

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*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 

CO-8, "Troubleshooting Chart"

.

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 res-

ervoir tank

• Visual

No overflow during driving 
and idling

CO-11, "Changing Engine 
Coolant"

OFF*

4

10

• Coolant return from res-

ervoir tank to radiator

• Visual

Should be initial level in 
reservoir tank

CO-11, "Changing Engine 
Coolant"

OFF

12

• Cylinder head

• Straight gauge feeler 

gauge

0.1 mm (0.004 in) Maxi-
mum distortion (warping)

EM-72, "Inspection After 
Disassembly"

13

• Cylinder block and pis-

tons

• Visual

No scuffing on cylinder 
walls or piston

EM-90, "Inspection After 
Disassembly"

Engine

Step

Inspection item

Equipment

Standard

Reference page

EC-306

< COMPONENT DIAGNOSIS >

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P1225 TP SENSOR

P1225 TP SENSOR

Component Description

INFOID:0000000005149354

Electric throttle control actuator consists of throttle control motor,

throttle position sensor, etc. The throttle position sensor responds to

the throttle valve movement. 

The throttle position sensor has the two sensors. These sensors are

a kind of potentiometers which transform the throttle valve position

into output voltage, and emit the voltage signal to the ECM. In addi-

tion, these sensors detect the opening and closing speed of the

throttle valve and feed the voltage signals to the ECM. The ECM

judges the current opening angle of the throttle valve from these sig-

nals and the ECM controls the throttle control motor to make the

throttle valve opening angle properly in response to driving condi-

tion.

On Board Diagnosis Logic

INFOID:0000000005149355

The MIL will not light up for this self-diagnosis.

DTC Confirmation Procedure

INFOID:0000000005149356

NOTE:

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure

before conducting the next step.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:

Before performing the following procedure, confirm that battery voltage is more than 10 V at idle.

1. Turn ignition switch ON.

2. Turn ignition switch OFF and wait at least 10 seconds.

3. Turn ignition switch ON.

4. Check 1st trip DTC.

5. If 1st trip DTC is detected, go to 

EC-306, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000005149357

1.

CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY

1. Turn ignition switch OFF.

2. Remove the intake air duct.

3. Check if foreign matter is caught between the throttle valve and

the housing.

OK or NG

OK

>> GO TO 2.

NG

>> Remove the foreign matter and clean the electric throttle

control actuator inside.

2.

REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

PBIB0145E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1225
1225

Closed throttle position learning 
performance

Closed throttle position learning value is 
excessively low.

• Electric throttle control actuator

(TP sensor 1 and 2)

BBIA0364E

P1225 TP SENSOR

EC-307

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1. Replace the electric throttle control actuator.

2. Perform 

EC-18, "Throttle Valve Closed Position Learning"

.

3. Perform 

EC-18, "Idle Air Volume Learning"

.

>> INSPECTION END