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Home >> Toyota >> 2001 >> 4Runner Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics >> Diagnostic Tests >> DTC P1780: Park/Neutral Position Switch Circuit >> Circuit Description
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Circuit Description

Park/Neutral Position (PNP) switch delivers input signals to ECM. Input signals are used for air/fuel correction and for idle speed control. DTC is set when 2 or more switches are on simultaneously for "R", "N", "2" and "L" position or when ECM is receiving an ON signal from PNP switch when vehicle is being operated for more than 30 seconds at 44 MPH or more with engine speed of 1500-2500 RPM. Possible causes are:

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