2008 INFINITI FX35 Service Manual

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Page 1649 of 3924

INFINITI FX35 2008 Service Manual
DTC P0506 ISC SYSTEMEC-409
< SERVICE INFORMATION > [VQ35DE]
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DTC P0506 ISC SYSTEM
DescriptionINFOID:0000000001326246
NOTE:
If DTC P0506 is displayed with ot
her DTC, fi

DTC P0506 ISC SYSTEMEC-409
< SERVICE INFORMATION > [VQ35DE]
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DTC P0506 ISC SYSTEM
DescriptionINFOID:0000000001326246
NOTE:
If DTC P0506 is displayed with ot
her DTC, first perform the trouble diagnosis for the other DTC.
The ECM controls the engine idle speed to a specified leve l through the fine adjustment of the air, which is let
into the intake manifold, by operating the electric thrott le control actuator. The operating of the throttle valve is
varied to allow for optimum control of the engine idli ng speed. The crankshaft position sensor (POS) 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 t he 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.).
On Board Diagnosis LogicINFOID:0000000001326247
DTC Confirmation ProcedureINFOID:0000000001326248
NOTE:
If DTC Confirmation Procedure has been previously conduc ted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
If the target idle speed is out of the specified value, perform, EC-85, "
Idle Air Volume Learning",
before conducting DTC Confirmation Procedure. For the target idle speed, refer to the EC-593
.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11V at idle.
Always perform the test at a temperature above −10 °C(14 °F).
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Start engine and run it for at least 1 minute at idle speed.
4. Check 1st trip DTC.
5. If 1st trip DTC is detected, go to EC-409, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000001326249
1.CHECK INTAKE AIR LEAK
1. Start engine and let it idle.
2. Listen for an intake air leak after the mass air flow sensor.
OK or NG
OK >> GO TO 2.
NG >> Discover air leak location and repair.
2.REPLACE ECM
1. Stop engine.
2. Replace ECM.
3. Perform initialization of IVIS(NATS) system and registration of all IVIS(NATS) ignition key IDs.
Refer to BL-187, "
ECM Re-Communicating Function".
4. Perform EC-84, "
VIN Registration".
5. Perform EC-85, "
Accelerator Pedal Released Position Learning".
6. Perform EC-85, "
Throttle Valve Closed Position Learning".
7. Perform EC-85, "
Idle Air Volume Learning".
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0506
0506 Idle speed control sys-
tem (ISC) 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 leak
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

Page 1650 of 3924

INFINITI FX35 2008 Service Manual
EC-410
< SERVICE INFORMATION >[VQ35DE]
DTC P0506 ISC SYSTEM
>>
INSPECTION END
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A8

Page 1651 of 3924

INFINITI FX35 2008 Service Manual
DTC P0507 ISC SYSTEMEC-411
< SERVICE INFORMATION > [VQ35DE]
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EC
NP
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DTC P0507 ISC SYSTEM
DescriptionINFOID:0000000001326250
NOTE:
If DTC P0507 is displayed with ot
her DTC, fi

DTC P0507 ISC SYSTEMEC-411
< SERVICE INFORMATION > [VQ35DE]
C
D
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G H
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M A
EC
NP
O
DTC P0507 ISC SYSTEM
DescriptionINFOID:0000000001326250
NOTE:
If DTC P0507 is displayed with ot
her DTC, first perform the trouble diagnosis for the other DTC.
The ECM controls the engine idle speed to a specified leve l through the fine adjustment of the air, which is let
into the intake manifold, by operating the electric thrott le control actuator. The operating of the throttle valve is
varied to allow for optimum control of the engine idli ng speed. The crankshaft position sensor (POS) 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 t he 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.).
On Board Diagnosis LogicINFOID:0000000001326251
DTC Confirmation ProcedureINFOID:0000000001326252
NOTE:
If DTC Confirmation Procedure has been previously conduc ted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
If the target idle speed is out of the specified value, perform, EC-85, "
Idle Air Volume Learning",
before conducting DTC Confirmation Procedure. For the target idle speed, refer to the EC-593
.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11V at idle.
Always perform the test at a temperature above −10 °C(14 °F).
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Start engine and run it for at least 1 minute at idle speed.
4. Check 1st trip DTC.
5. If 1st trip DTC is detected, go to EC-411, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000001326253
1.CHECK PCV HOSE CONNECTION
Confirm that PCV hose is connected correctly.
OK or NG
OK >> GO TO 2.
NG >> Repair or replace.
2.CHECK INTAKE AIR LEAK
1. Start engine and let it idle.
2. Listen for an intake air leak after the mass air flow sensor.
OK or NG
OK >> GO TO 3.
NG >> Discover air leak location and repair.
3.REPLACE ECM
1. Stop engine.
2. Replace ECM.
3. Perform initialization of IVIS(NATS) system and registration of all IVIS(NATS) ignition key IDs.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0507
0507 Idle speed control sys-
tem (ISC) 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 leak
PCV system
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

Page 1652 of 3924

INFINITI FX35 2008 Service Manual
EC-412
< SERVICE INFORMATION >[VQ35DE]
DTC P0507 ISC SYSTEM
Refer to
BL-187, "ECM Re-Communicating Function".
4. Perform EC-84, "
VIN Registration".
5. Perform EC-85, "
Accelerator Pedal Released

Page 1653 of 3924

INFINITI FX35 2008 Service Manual
DTC P0550 PSP SENSOREC-413
< SERVICE INFORMATION > [VQ35DE]
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DTC P0550 PSP SENSOR
Component DescriptionINFOID:0000000001326254
Power steering pressure (PSP) sensor is i

Page 1654 of 3924

INFINITI FX35 2008 Service Manual
EC-414
< SERVICE INFORMATION >[VQ35DE]
DTC P0550 PSP SENSOR
Wiring Diagram
INFOID:0000000001326258
Specification data are reference values and are measured between each terminal and ground.
CAUTION:

Page 1655 of 3924

INFINITI FX35 2008 Service Manual
DTC P0550 PSP SENSOREC-415
< SERVICE INFORMATION > [VQ35DE]
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Diagnosis ProcedureINFOID:0000000001326259
1.CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loose

Page 1656 of 3924

INFINITI FX35 2008 Service Manual
EC-416
< SERVICE INFORMATION >[VQ35DE]
DTC P0550 PSP SENSOR
3. Check voltage between PSP sensor terminal 1 and ground with
CONSULT-III or tester.
OK or NG
OK >> GO TO 3.
NG >> Repair open circuit or

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