Infiniti I35 (A33). Manual - part 273

Description

NHEC0787

NOTE:
If DTC P0506 is displayed with other DTC, first perform the trouble diagnosis for the other DTC.
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 (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 the lowest speed at which the engine can operate steadly.
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 Logic

NHEC0790

DTC No.

Trouble diagnosis

name

DTC Detecting Condition

Possible Cause

P0506
0506

Idle speed control
system RPM lower
than expected

The idle speed is not in the specified range.

Electric throttle control actuator

Intake air leak

DTC Confirmation Procedure

NHEC0792

NOTE:

DTC

Confirmation

Procedure

has

been

previously

conducted, 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, per-
form “Idle Air Volume Learning” before conducting “DTC
Confirmation Procedure”. For the target idle speed, refer
to the “Service Data and Specifications (SDS)”, EC-739.

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).

SEF174Y

WITH CONSULT-II

NHEC0792S03

Open engine hood.

Start engine and warm it up to normal operating temperature.

Turn ignition switch OFF and wait at least 10 seconds.

Turn ignition switch ON again and select “DATA MONITOR”
mode with CONSULT-II.

Start engine and run it for at least 1 minute at idle speed.

If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-434.

IDX

DTC P0506 ISC SYSTEM

Description

EC-433

WITH GST

NHEC0792S04

Follow the procedure “With CONSULT-II” above.

Diagnostic Procedure

NHEC0794

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

GO TO 2.

Discover air leak location and repair.

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 “IVIS (INFINITI

VEHICLE IMMOBILIZER SYSTEM — NATS)”, EC-90.

4. Perform “Accelerator Pedal Released Position Learning”, EC-70.
5. Perform “Throttle Valve Closed Position Learning”, EC-70.
6. Perform “Idle Air Volume Learning”, EC-70.

INSPECTION END

DTC P0506 ISC SYSTEM

DTC Confirmation Procedure (Cont’d)

EC-434

Description

NHEC0795

NOTE:
If DTC P0507 is displayed with other DTC, first perform the trouble diagnosis for the other DTC.
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 (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 the lowest speed at which the engine can operate steadly.
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 Logic

NHEC0798

DTC No.

Trouble diagnosis

name

DTC Detecting Condition

Possible Cause

P0507
0507

Idle speed control
system RPM higher
than expected

The idle speed is not in the specified range.

Electric throttle control actuator

Intake air leak

DTC Confirmation Procedure

NHEC0800

NOTE:

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 11V at idle.

Always perform the test at a temperature above −10°C
(14°F).

SEF174Y

WITH CONSULT-II

NHEC0800S03

Open engine hood.

Start engine and warm it up to normal operating temperature.

Turn ignition switch OFF and wait at least 10 seconds.

Turn ignition switch ON again and select “DATA MONITOR”
mode with CONSULT-II.

Start engine and run it for at least 1 minute at idle speed.

If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-436.

IDX

DTC P0507 ISC SYSTEM

Description

EC-435

WITH GST

NHEC0800S04

Follow the procedure “With CONSULT-II” above.

Diagnostic Procedure

NHEC0802

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

GO TO 2.

Discover air leak location and repair.

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 “IVIS (INFINITI

VEHICLE IMMOBILIZER SYSTEM — NATS)”, EC-90.

4. Perform “Accelerator Pedal Released Position Learning”, EC-70.
5. Perform “Throttle Valve Closed Position Learning”, EC-70.
6. Perform “Idle Air Volume Learning”, EC-70.

INSPECTION END

DTC P0507 ISC SYSTEM

DTC Confirmation Procedure (Cont’d)

EC-436

Content .. 271 272 273 274 ..