Infiniti FX35 / FX45. Manual — part 421
DTC P1217 ENGINE OVER TEMPERATURE
EC-445
< SERVICE INFORMATION >
[VQ35DE]
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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
EC-446, "Component Inspection"
OK or NG
OK
>> GO TO 13.
NG
>> Replace malfunctioning cooling fan motors.
13.
CHECK INTERMITTENT INCIDENT
Perform
OK or NG
OK
>> Replace IPDM E/R. Refer to
.
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
.
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
ON*
2
6
• Thermostat
• Touch the upper and
lower radiator hoses
Both hoses should be hot
ON*
1
7
• Cooling fan
• CONSULT-III
Operating
See trouble diagnosis for
DTC P1217 (
).
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
EC-446
< SERVICE INFORMATION >
[VQ35DE]
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
< SERVICE INFORMATION >
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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
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.
EC-85, "Throttle Valve Closed Position Learning"
.
3.
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
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