P0781

DTC P0781 1-2 Shift (1-2 Shift Valve)

DESCRIPTION
The 1-2 shift valve performs shifting to 1st gear and other gears.

P0781:

MONITOR DESCRIPTION
This DTC indicates that the 1-2 shift valve in the valve body is locked in the direction that the spring compresses.

The ECM commands gear shifts by turning the shift solenoid valves ON/OFF and controls the oil pressure applied to the valves in the valve body.

The ECM calculates the actual transmission gear by comparing the signals from the input speed sensor (NT) and the output speed sensor (SP2). The ECM can detect mechanical problems in the shift solenoids, valve body and automatic transmission (clutch, brake, gear etc.). If the ECM detects that the actual gear position and the commanded gear position are different, it will illuminate the MIL and store the DTC.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS

Part 1:

Part 2:

INSPECTION PROCEDURE

Steps 1-2(Part 1):

Step 2(Part 2):

Step 3:

Step 4: