Circuit Description

The PNP switch sends a signal to ECM when transmission is in Neutral or Park position. This signal is used for air/fuel correction and for idle speed control. DTC is set under 2 conditions:

• When 2 or more switches are on simultaneously for "R", "N", "2" and "L" position.
• ECM is receiving an ON signal from PNP switch when vehicle is being operated for more than 30 seconds at 44 MPH or more (1500-2500 RPM).

Possible causes are:

• PNP switch short circuit.
• PNP switch.
• ECM.