Nissan Frontier. Manual - part 561

P0500 VSS

EC-815

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR USA AND CANADA]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

6. Check 1st trip DTC.

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

EC-815, "Diagnosis Procedure"

.

Overall Function Check

INFOID:0000000009481477

Use this procedure to check the overall function of the vehicle speed sensor circuit. During this check, a 1st

trip DTC might not be confirmed.

 WITH GST

1. Lift up drive wheels.

2. Start engine.

3. Read vehicle speed sensor signal in Service $01 with GST.

The vehicle speed sensor on GST should be able to exceed 10 km/h (6 MPH) when rotating wheels with

suitable gear position.

4. If NG, go to 

EC-815, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009481478

1.

CHECK DTC WITH “ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)”

Refer to 

BRC-8, "Work Flow"

 (TYPE 1) or 

BRC-120, "Work Flow"

 (TYPE 2).

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace.

2.

CHECK COMBINATION METER FUNCTION

Refer to 

GI-42, "Intermittent Incident"

.

>> INSPECTION END

B/FUEL SCHDL

5.5 - 31.8 msec (M/T)
6.3 - 31.8 msec (A/T)

Selector lever

Neutral position (M/T)
Except P or N position (A/T)

PW/ST SIGNAL

OFF

EC-816

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR USA AND CANADA]

P0506 ISC SYSTEM

P0506 ISC SYSTEM

Description

INFOID:0000000009481479

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 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:0000000009481480

DTC Confirmation Procedure

INFOID:0000000009481481

NOTE:

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

EC-591, "Idle Air Volume Learning"

,

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

EC-962

.

• 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-816, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009481482

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.

CAUTION:

Perform Additional Service When Replacing ECM. Refer to 

EC-588, "Additional Service When

Replacing ECM"

.

2. Replace ECM.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0506
0506

Idle speed control sys-
tem RPM lower than ex-
pected

The idle speed is less than the target idle speed 
by 100 rpm or more.

• Electric throttle control actuator
• Intake air leak

P0506 ISC SYSTEM

EC-817

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR USA AND CANADA]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

>> INSPECTION END

EC-818

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR USA AND CANADA]

P0507 ISC SYSTEM

P0507 ISC SYSTEM

Description

INFOID:0000000009481483

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:0000000009481484

DTC Confirmation Procedure

INFOID:0000000009481485

NOTE:

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

EC-591, "Idle Air Volume Learning"

,

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

EC-962

.

• 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-818, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009481486

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