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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 >> P1783: Transfer Neutral Position Switch Malfunction >> 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.

The propeller shaft and wheels are free even when the gearshift lever is in Park as long as the transfer case gearshift lever is in the Neutral position. The A/T "P" indicator light illuminates up to warn the driver that the propeller shaft and wheels are not locked. If the A/T "P" indicator light goes on, the transfer case gearshift lever should be shifted out of the Neutral position. The ECM receives a TFN signal from the transfer neutral position switch. DTC can set when: Driving for 30 seconds or more, the transfer neutral position switch is ON, vehicle speed is 16 MPH or more, and transfer case gearshift position is "H". Possible causes are: