Infiniti G37 Coupe. Manual — part 551
P1217 ENGINE OVER TEMPERATURE
EC-385
< COMPONENT DIAGNOSIS >
[VQ37VHR]
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Check the coolant level in the reservoir tank and radiator.
Allow engine to cool before checking coolant level.
Is the coolant level in the reservoir tank and/or radiator below the
proper range?
YES
>> Go to
NO
>> GO TO 2.
2.
PERFORM COMPONENT FUNCTION CHECK-II
Confirm whether customer filled the coolant or not.
Did customer fill the coolant?
YES
>> Go to
NO
>> GO TO 3.
3.
PERFORM COMPONENT FUNCTION CHECK-III
With CONSULT-III
1.
Turn ignition switch ON.
2.
Perform “FAN DUTY CONTROL” in “ACTIVE TEST” mode with CONSULT-III.
3.
Make sure that cooling fan speed varies according to the percent.
Without CONSULT-III
Perform IPDM E/R auto active test and check cooling fan motors operation, refer to
.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
Diagnosis Procedure
INFOID:0000000001734192
1.
CHECK COOLING FAN OPERATION
With CONSULT-III
1.
Turn ignition switch ON.
2.
Perform “FAN DUTY CONTROL” in “ACTIVE TEST” mode with CONSULT-III.
3.
Make sure that cooling fan speed varies according to the percent.
Without CONSULT-III
1.
Perform IPDM E/R auto active test and check cooling fan motors operation, refer to
.
2.
Make sure that cooling fan operates.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Go to
2.
CHECK COOLING SYSTEM FOR LEAK-I
Check cooling system for leak. Refer to
Is leakage detected?
YES
>> GO TO 3.
NO
>> GO TO 4.
3.
CHECK COOLING SYSTEM FOR LEAK-II
Check the following for leak.
• Hose
• Radiator
• Water pump
SEF621W
EC-386
< COMPONENT DIAGNOSIS >
[VQ37VHR]
P1217 ENGINE OVER TEMPERATURE
>> Repair or replace malfunctioning part.
4.
CHECK RADIATOR CAP
Check radiator cap. Refer to
CO-12, "RADIATOR CAP : Inspection"
.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Replace radiator cap.
5.
CHECK THERMOSTAT
Check thermostat. Refer to
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Replace thermostat
6.
CHECK ENGINE COOLANT TEMPERATURE SENSOR
EC-186, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Replace engine coolant temperature sensor.
7.
CHECK MAIN 12 CAUSES
If the cause cannot be isolated, check the following.
*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.
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
4
• Radiator cap
• Pressure tester
107 kPa
(1.1 kg/cm
2
, 16 psi) (Limit)
CO-12, "RADIATOR CAP
: Inspection"
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
EC-481, "Component
Function Check"
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
OFF*
4
10
• Coolant return from res-
ervoir tank to radiator
• Visual
Should be initial level in
reservoir tank
OFF
11
• Cylinder head
• Straight gauge feeler
gauge
0.1 mm (0.004 in) Maxi-
mum distortion (warping)
12
• Cylinder block and pis-
tons
• Visual
No scuffing on cylinder
walls or piston
P1217 ENGINE OVER TEMPERATURE
EC-387
< COMPONENT DIAGNOSIS >
[VQ37VHR]
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For more information, refer to
.
>> INSPECTION END
EC-388
< COMPONENT DIAGNOSIS >
[VQ37VHR]
P1225, P1234 TP SENSOR
P1225, P1234 TP SENSOR
Description
INFOID:0000000001910843
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 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.
DTC Logic
INFOID:0000000001734194
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
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 10V at idle.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
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.
Is 1st trip DTC detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000001734195
1.
CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY
1.
Turn ignition switch OFF.
2.
Remove the intake air duct.
PBIB0145E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1225
Closed throttle position learning per-
formance (bank 1)
Closed throttle position learning value
is excessively low.
• Electric throttle control actuator
(TP sensor 1 and 2)
P1234
Closed throttle position learning per-
formance (bank 2)
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