Nissan Altima L32. Manual - part 307

P0500 VSS

EC-349

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

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 

EC-349, "Diagnosis Procedure"

.

NO

>> INSPECTION END

5.

PERFORM COMPONENT FUNCTION CHECK

Perform component function check. Refer to 

EC-349, "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 

EC-349, "Diagnosis Procedure"

.

Component Function Check

INFOID:0000000004349380

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 

EC-349, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000004349381

1.

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

Refer to 

BRC-12, "CONSULT-III Function (ABS)"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace.

2.

CHECK COMBINATION METER

Refer to 

MWI-38, "CONSULT-III Function (METER/M&A)"

.

>> INSPECTION END

ENG SPEED

CVT: 1,350 - 6,000 rpm
M/T: 1,650 - 6,000 rpm

COOLAN TEMP/S

More than 70

°C (158°F)

B/FUEL SCHDL

CVT: 5.5 - 31.8 msec
M/T: 4.8 - 31.8 msec

Shift lever

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

PW/ST SIGNAL

OFF

EC-350

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

P0506 ISC SYSTEM

P0506 ISC SYSTEM

Description

INFOID:0000000004349382

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.). 

DTC Logic

INFOID:0000000004349383

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 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-30, "IDLE AIR VOLUME LEARNING :

Special Repair Requirement"

, before conducting DTC Confirmation Procedure.

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).

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

4. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Go to 

EC-350, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000004349384

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.
Is intake air leak detected?

YES

>> Discover air leak location and repair.

NO

>> GO TO 2.

2.

REPLACE ECM

1. Stop engine.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0506

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-351

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

2. Replace ECM.

3. Go to 

EC-27, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Require-

ment"

.

>> INSPECTION END

EC-352

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

P0507 ISC SYSTEM

P0507 ISC SYSTEM

Description

INFOID:0000000004349385

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.). 

DTC Logic

INFOID:0000000004349386

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 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-30, "IDLE AIR VOLUME LEARNING :

Special Repair Requirement"

, before conducting DTC Confirmation Procedure.

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).

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

4. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Go to 

EC-352, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000004349387

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.

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.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0507

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