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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 39 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P1780: Park/Neutral Position Switch Malfunction >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2002 Lexus RX 300. However, it is still accessible from the selected car via links, so may be relevant.

Park/neutral position switch is on whenever shift lever is in "N" or "P" position. With switch on, ECM terminal NSW is grounded via starter relay (zero voltage at terminal NSW). With shift lever in "D", "2", "L" or "R" position, switch is off (battery voltage at terminal NSW).

DTC P1780 is set when 2 or more switches are on simultaneously for "N", "2", "L"or "R"position. DTC P1780 is also set if park/neutral position switch is on while driving vehicle for 30 seconds or more at 44 MPH or more. DTC P1780 is also set if park/neutral position switch is on while driving vehicle for 30 seconds or more with engine speed at 1500-2500 RPM. Possible causes are:

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