Nissan Altima (L32) 2007-2012 Service Manual: P0506 ISC System
Description
The ECM controls the engine idle speed to a specified level via 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
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 perform the following before conducting the next test.
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.
If the target idle speed is out of the specified value, perform EC-1053, "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 11 V 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. Turn ignition switch ON.
4. Turn ignition switch OFF and wait at least 10 seconds.
5. Restart engine and run it for at least 1 minute at idle speed.
6. Check 1st trip DTC.
Is 1st trip DTC detected? YES >> Go to EC-1367, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure
1.CHECK INTAKE AIR LEAKAGE
1. Start engine and let it idle.
2. Listen for an intake air leakage after the mass air flow sensor.
Is intake air leakage detected?
YES >> Discover air leakage location and repair.
NO >> GO TO 2.
2.REPLACE ECM
1. Stop engine.
2. Replace ECM.
3. Go to EC-1051, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Requirement".
>> INSPECTION END
P0500 VSS
Description The vehicle speed signal is sent to the combination meter from the “ABS actuator and electric unit (control unit)” via the CAN communication line. The combination meter then sends ...P0507 ISC System
Description The ECM controls the engine idle speed to a specified level via the fine adjustment of the air, which is let into the intake manifold, by operating the electric throttle control actuat ...Other materials:
Audio system voice commands
To access the audio system voice commands:
1. Press the button.
2. Say “Audio”
3. Speak a command from the following available
commands:
● Play (AM, FM, etc.)
Allows user to select radio band
● Tune AM (number)
Allows user to tune directly to a desired AM
frequency
● ...
Rapid air pressure loss
Rapid air pressure loss or a “blow-out” can occur
if the tire is punctured or is damaged due to
hitting a curb or pothole. Rapid air pressure loss
can also be caused by driving on under-inflated
tires.
Rapid air pressure loss can affect the handling
and stability of the vehicle, especial ...
Service data and specifications
(SDS)
Idle Speed
*: Under the following conditions
• A/C switch: OFF
• Electric load: OFF (Lights, heater fan & rear window defogger)
• Steering wheel: Kept in straight-ahead position
Ignition Timing
*: Under the following conditions
• A/C switch: OFF
• Electric load: OFF (Light ...