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Home >> Toyota >> 2001 >> Land Cruiser >> 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 sends a signal to ECM when transaxle is in Neutral or Park. This signal is 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 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:

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