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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 66 (Automatic Transmission - Diagnosis) >> Diagnostic Tests >> DTC P1780: Park/Neutral Position Switch >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2002 Toyota Land Cruiser, 2002 Lexus LX 470, 2001 Toyota Land Cruiser, and 2001 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.

PNP switch verifies gearshift lever position and sends signals to ECM. If no signal is received from PNP switch, ECM defaults to drive ("D") position. DTC is set when ECM detects 2 or more circuits are on. Vehicle speed has to be above 44 MPH for more than 30 seconds with engine speed at 1500-2500 RPM. Possible causes are:

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