Nissan Frontier. Manual - part 668

 

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Nissan Frontier. Manual - part 668

 

 

P0506 ISC SYSTEM

EC-1243

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR MEXICO]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

5. Perform 

EC-1074, "Accelerator Pedal Released Position Learning"

.

6. Perform 

EC-1075, "Throttle Valve Closed Position Learning"

.

7. Perform 

EC-1075, "Idle Air Volume Learning"

.

>> INSPECTION END

EC-1244

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR MEXICO]

P0507 ISC SYSTEM

P0507 ISC SYSTEM

Description

INFOID:0000000009481887

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 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 Logic

INFOID:0000000009481888

DTC Confirmation Procedure

INFOID:0000000009481889

NOTE:

• If the target idle speed is out of the specified value, perform, 

EC-1075, "Idle Air Volume Learning"

,

before conducting DTC Confirmation Procedure. For the target idle speed, refer to the 

EC-1381

.

• If DTC Confirmation Procedure has been previously conducted, always perform the following before con-

ducting 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 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. 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.

7. If 1st trip DTC is detected, go to 

EC-1244, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009481890

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.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0507
0507

Idle speed control sys-
tem 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

P0507 ISC SYSTEM

EC-1245

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR MEXICO]

C

D

E

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EC

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3.

REPLACE ECM

1. Stop engine.

2. Replace ECM.

3. Perform initialization of NVIS(NATS) system and registration of all NVIS(NATS) ignition key IDs. Refer to

SEC-7, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Requirement"

.

4. Perform 

EC-1074, "VIN Registration"

.

5. Perform 

EC-1074, "Accelerator Pedal Released Position Learning"

.

6. Perform 

EC-1075, "Throttle Valve Closed Position Learning"

.

7. Perform 

EC-1075, "Idle Air Volume Learning"

.

>> INSPECTION END

EC-1246

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR MEXICO]

P0550 PSP SENSOR

P0550 PSP SENSOR

Component Description

INFOID:0000000009481891

Power steering pressure (PSP) sensor is installed to the power

steering high-pressure tube and detects a power steering load. This

sensor is a potentiometer which transforms the power steering load

into output voltage, and emits the voltage signal to the ECM. The

ECM controls the electric throttle control actuator and adjusts the

throttle valve opening angle to increase the engine speed and

adjusts the idle speed for the increased load.

On Board Diagnosis Logic

INFOID:0000000009481892

The MIL will not illuminate for this diagnosis.

NOTE:

If DTC P0550 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to

EC-1256

.

DTC Confirmation Procedure

INFOID:0000000009481893

1. If DTC Confirmation Procedure has been previously conducted, always perform the following before con-

ducting the next step.

a. Turn ignition switch OFF and wait at least 10 seconds.
b. Turn ignition switch ON.
c.

Turn ignition switch OFF and wait at least 10 seconds.

2. Start engine and let it idle for at least 5 seconds.
3. Check 1st trip DTC.
4. If 1st trip DTC is detected, go to 

EC-1246, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009481894

1.

CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF.

2. Loosen and retighten three ground screws on the body. Refer to 

EC-1094, "Ground Inspection"

.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

BBIA0552E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0550
0550

Power steering pressure 
sensor circuit

An excessively low or high voltage from the 
sensor is sent to ECM.

• Harness or connectors

(The sensor circuit is open or shorted)

• Power steering pressure sensor

BBIA0539E

 

 

 

 

 

 

 

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