Infiniti FX35 / FX45. Manual - part 421

DTC P1217 ENGINE OVER TEMPERATURE

EC-445

< SERVICE INFORMATION >

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Check the following.
• Harness connectors E29, E121
• Harness for open or short between cooling fan motor-2 and IPDM E/R

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

12.

CHECK COOLING FAN MOTORS

Refer to 

EC-446, "Component Inspection"

.

OK or NG

OK

>> GO TO 13.

NG

>> Replace malfunctioning cooling fan motors.

13.

CHECK INTERMITTENT INCIDENT

Perform 

EC-139

.

OK or NG

OK

>> Replace IPDM E/R. Refer to 

PG-17

.

NG

>> Repair or replace harness or connector. 

Main 12 Causes of Overheating

INFOID:0000000001326297

*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-7

.

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

MA-10, "Anti-Freeze 
Coolant Mixture Ratio"

3

• Coolant  level

• Visual

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

CO-10, "Changing Engine 
Coolant"

4

• Radiator cap

• Pressure tester

59 - 98 kPa

(0.6 - 1.0 kg/cm

2

, 9 - 14 

psi) (Limit)

CO-14, "Checking Radia-
tor Cap"

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-27

ON*

1

7

• Cooling fan

• CONSULT-III

Operating

See trouble diagnosis for 
DTC P1217 (

EC-437

).

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-10, "Changing Engine 
Coolant"

OFF*

4

10

• Coolant return from res-

ervoir tank to radiator

• Visual

Should be initial level in 
reservoir tank

CO-10, "Changing Engine 
Coolant"

OFF

11

• Cylinder head

• Straight gauge feeler 

gauge

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

EM-101, "Removal and 
Installation"

12

• Cylinder block and pis-

tons

• Visual

No scuffing on cylinder 
walls or piston

EM-122

EC-446

< SERVICE INFORMATION >

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DTC P1217 ENGINE OVER TEMPERATURE

Component Inspection

INFOID:0000000001326298

COOLING FAN MOTORS-1 AND -2

1.

Disconnect cooling fan motor harness connectors.

2.

Supply cooling fan motor terminals with battery voltage and
check operation.

Cooling fan motor should operate.
If NG, replace cooling fan motor.

Cooling fan speed

Cooling fan motor terminals

(+)

(

−

)

Middle (MID)

1

3 and 4

2

3 and 4

1 and 2

3

1 and 2

4

High (HI)

1 and 2

3 and 4

SEF734W

DTC P1225 TP SENSOR

EC-447

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DTC P1225 TP SENSOR

Component Description

INFOID:0000000001326299

Electric throttle control actuator consists of throttle control motor,
throttle position (TP) sensor, etc. The throttle position sensor
responds to the throttle valve movement. 
The throttle position sensor has 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 addition,
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 signals and the
ECM controls the throttle control motor to make the throttle valve
opening angle properly in response to driving condition.

On Board Diagnosis Logic

INFOID:0000000001326300

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

DTC Confirmation Procedure

INFOID:0000000001326301

NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10V 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-447, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000001326302

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

1.

Replace the electric throttle control actuator.

2.

Perform 

EC-85, "Throttle Valve Closed Position Learning"

.

3.

Perform 

EC-85, "Idle Air Volume Learning"

.

PBIB0145E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1225
1225

Closed throttle position 
learning performance

Closed throttle position learning value is exces-
sively low.

• Electric throttle control actuator

(TP sensor 1 and 2)

PBIB1556E

EC-448

< SERVICE INFORMATION >

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DTC P1225 TP SENSOR

>> INSPECTION END

Removal and Installation

INFOID:0000000001326303

ELECTRIC THROTTLE CONTROL ACTUATOR

Refer to 

EM-19

.