Description
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 DETECTION LOGIC
NOTE: If DTC P0507 is displayed with other DTC, first perform the trouble diagnosis for the other DTC.
DTC No. | Trouble diagnosis name | DTC detecting condition | Possible cause |
P0507 | ISC SYSTEM (Idle speed control system RPM higher than expected) | The idle speed is more than the target idle speed by 200 rpm or more. |
|
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.
If the target idle speed is out of the specified value, perform EC, "Work Procedure", before conducting DTC Confirmation Procedure.
TESTING CONDITION:
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
Is 1st trip DTC detected?
YES >> Proceed to EC, "Diagnosis Procedure".
NO >> INSPECTION END
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 errordetected parts.
2.CHECK INTAKE AIR LEAK
Is intake air leak detected?
YES >> Discover air leak location and repair.
NO >> Replace ECM. Refer to EC, "Removal and Installation".
Description 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 ac ...
Description ECM controls ignition timing and engine idle speed when engine is started with prewarming up condition. This control promotes the activation of three way catalyst by heating the c ...
Owner's Manual/Service Manual order information
Genuine NISSAN Service Manuals for this model
year and prior can be purchased. A Genuine
NISSAN Service Manual is the best source of
service and repair information for your vehicle.
This manual is the same one used by the factorytrained
technicians working at NISSAN dealerships.
Genuine NI ...
P1715 Input speed sensor
Description
ECM receives input speed sensor signal from TCM via the CAN communication
line. ECM uses this signal for
engine control.
DTC Logic
DTC DETECTION LOGIC
NOTE:
If DTC P1715 is displayed with DTC UXXXX, first perform the
trouble diagnosis for DTC UXXXX.
If DTC P1715 is displa ...