Infiniti FX35, FX50 (S51). Manual — part 852
P0500 VSS
EC-949
< DTC/CIRCUIT DIAGNOSIS >
[VK50VE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
4.
Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Go to
NO
>> INSPECTION END
4.
PERFORM COMPONENT FUNCTION CHECK
With GST
Perform Component Function Check. Refer to
EC-949, "Component Function Check"
Use Component Function Check to check the overall function of the vehicle speed signal circuit. During this
check, a 1st trip DTC might not be confirmed.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
Component Function Check
INFOID:0000000005237415
1.
PERFORM COMPONENT FUNCTION CHECK
With GST
1.
Lift up drive wheels.
2.
Start engine.
3.
Read vehicle speed signal in Service $01 with GST.
The vehicle speed signal on GST should be able to exceed 10 km/h (6 MPH) when rotating wheels with
suitable gear position.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
Diagnosis Procedure
INFOID:0000000005237416
1.
CHECK DTC WITH “ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)”
BRC-44, "CONSULT-III Function"
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace malfunctioning part.
2.
CHECK DTC WITH “UNIFIED METER AND A/C AMP.”
MWI-45, "CONSULT-III Function (METER/M&A)"
.
>> INSPECTION END
B/FUEL SCHDL
5.5 - 31.8 msec
Selector lever
Except P or N position
PW/ST SIGNAL
OFF
EC-950
< DTC/CIRCUIT DIAGNOSIS >
[VK50VE]
P0506 ISC SYSTEM
P0506 ISC SYSTEM
Description
INFOID:0000000005237417
The ECM controls the engine idle speed to a specified level through the fine adjustment of the air, which is let
into the intake manifold, by operating the electric throttle control actuator. The operating of the throttle valve is
varied to allow for optimum control of the engine idling speed. The crankshaft position sensor detects the
actual engine speed and sends a signal to the ECM.
The ECM controls the electric throttle control actuator so that the engine speed coincides with the target value
memorized in the ECM. The target engine speed is the lowest speed at which the engine can operate steadily.
The optimum value stored in the ECM is determined by taking into consideration various engine conditions,
such as during warming up, deceleration and engine load (air conditioner, power steering and cooling fan
operation, etc.).
DTC Logic
INFOID:0000000005237418
DTC DETECTION LOGIC
NOTE:
If DTC P0506 is displayed with other DTC, first perform the trouble diagnosis for the other DTC.
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting 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.
If the target idle speed is out of the specified value, perform
EC-582, "IDLE AIR VOLUME LEARNING :
, before conducting DTC Confirmation Procedure.
TESTING CONDITION:
• Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.
• Always perform the test at a temperature above
−
10
°
C (14
°
F).
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Start engine and warm it up to normal operating temperature.
2.
Turn ignition switch OFF and wait at least 10 seconds.
3.
Turn ignition switch ON.
4.
Turn ignition switch OFF and wait at least 10 seconds.
5.
Restart engine and run it for at least 1 minute at idle speed.
6.
Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000005237419
1.
CHECK INTAKE AIR LEAKAGE
1.
Start engine and let it idle.
2.
Listen for an intake air leakage after the mass air flow sensor.
Is intake air leakage detected?
YES
>> Discover air leakage location and repair.
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0506
Idle speed control system
RPM lower than expected
The idle speed is less than the target idle
speed by 100 rpm or more.
• Electric throttle control actuator
• Intake air leakage
P0506 ISC SYSTEM
EC-951
< DTC/CIRCUIT DIAGNOSIS >
[VK50VE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
NO
>> GO TO 2.
2.
REPLACE ECM
1.
Stop engine.
2.
Replace ECM.
3.
EC-579, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT (ECM) : Special Repair
.
>> INSPECTION END
EC-952
< DTC/CIRCUIT DIAGNOSIS >
[VK50VE]
P0507 ISC SYSTEM
P0507 ISC SYSTEM
Description
INFOID:0000000005237420
The ECM controls the engine idle speed to a specified level through the fine adjustment of the air, which is let
into the intake manifold, by operating the electric throttle control actuator. The operating of the throttle valve is
varied to allow for optimum control of the engine idling speed. The crankshaft position sensor detects the
actual engine speed and sends a signal to the ECM.
The ECM controls the electric throttle control actuator so that the engine speed coincides with the target value
memorized in the ECM. The target engine speed is the lowest speed at which the engine can operate steadily.
The optimum value stored in the ECM is determined by taking into consideration various engine conditions,
such as during warming up, deceleration and engine load (air conditioner, power steering and cooling fan
operation, etc.).
DTC Logic
INFOID:0000000005237421
DTC DETECTION LOGIC
NOTE:
If DTC P0507 is displayed with other DTC, first perform the trouble diagnosis for the other DTC.
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting 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.
If the target idle speed is out of the specified value, perform
EC-582, "IDLE AIR VOLUME LEARNING :
, before conducting DTC Confirmation Procedure.
TESTING CONDITION:
• Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.
• Always perform the test at a temperature above
−
10
°
C (14
°
F).
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Start engine and warm it up to normal operating temperature.
2.
Turn ignition switch OFF and wait at least 10 seconds.
3.
Turn ignition switch ON.
4.
Turn ignition switch OFF and wait at least 10 seconds.
5.
Start engine and run it for at least 1 minute at idle speed.
6.
Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000005237422
1.
CHECK PCV HOSE CONNECTION
Confirm that PCV hose is connected correctly.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace malfunctioning part.
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0507
Idle speed control system
RPM higher than expected
The idle speed is more than the target idle
speed by 200 rpm or more.
• Electric throttle control actuator
• Intake air leakage
• PCV system
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