Symptoms

- Engine Light ON (or Service Engine Soon Warning Light) - Engine idle problems - Possible hard to start - Possible shifting problems

Possible Causes

- The closed throttle position switch Harness or connectors is shorted - Closed throttle position switch - Throttle position sensor

When Detected

Malfunction is detected when battery voltage from the closed throttle position switch is sent to ECM with the throttle valve opened.

Tech Notes

There is a Nissan bulletin for the following models: 1995-1996 Nissan Maxima 1995-1997 Nissan Sentra/200SX 1996-1997 Nissan Truck 1995-1997 Nissan Altima 1996-1997 Nissan Pathfinder 1995-1996 Nissan 240SX 1996-1997 Nissan Quest Nissan Service Bulletin OBDII Code P0510

Description

A closed throttle position switch and wide open throttle position switch are built into the throttle position sensor unit. The wide open throttle position switch is used only for A/T control. When the throttle valve is in the closed position, the closed throttle position switch sends a voltage signal to the ECM. The ECM only uses this signal to open or close the EVAP canister purge volume control solenoid valve when the throttle position sensor is malfunctioning.