P0781

DTC P0781 1-2 SHIFT (1-2 SHIFT VALVE)

SYSTEM DESCRIPTION

DTC Detection Condition:

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

MONITOR DESCRIPTION

Monitor Strategy:

Typical Enabling Condition:

Typical Malfunction Thresholds:

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

The ECM commands gear shifts by turning the shift solenoid valves "ON/OFF" and switching oil pressure 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 many mechanical problems in the shift solenoids, valve body, and the transmission clutches, brakes, and gears. 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.

Step 1:

Step 2:

Step 3:

INSPECTION PROCEDURE