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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 67 (Automatic Transmission Diagnosis - A340E, A340F) >> Diagnostic Tests >> DTC P1780: Park/Neutral Position Switch >> Circuit Description

Circuit Description

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2002 Toyota Tundra, 2002 Toyota Tacoma, 2002 Toyota Sequoia, 2002 Toyota 4Runner, and 2001 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.

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

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