Infiniti QX56 (JA60). Manual — part 413
EC-304
< COMPONENT DIAGNOSIS >
[VK56DE]
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
.
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
.)
• 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
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)
ON*
2
5
• Coolant leaks
• Visual
No leaks
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 (
P1217 ENGINE OVER TEMPERATURE
EC-305
< COMPONENT DIAGNOSIS >
[VK56DE]
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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
.
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 >
[VK56DE]
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
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
< COMPONENT DIAGNOSIS >
[VK56DE]
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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
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