2002 Nissan Altima 3.5 P0507 Code

Question

My 02 Altima with 3.5 V6 show error code P0507 ICS RPM Higher Then Expected. Any Suggestions? Thanks

Answer 1

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.).

You can take it to a Nissan Dealer and have them do a idle relearn procedure and see if that fixes it. If it doesn't then you might need a new ECM.