AUTOMATIC TRANSMISSION (DIAGNOSTICS)(4AT) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC P0736 REVERSE INCORRECT RATIO

DTC DETECTING CONDITION:

Vehicle sensor, torque converter turbine speed sensor or control valve malfunction

TROUBLE SYMPTOM:

• Shift point is too high or too low.

• Excessive shift shock

• Tight corner braking phenomenon occurs.

• Gear is not shifted to reverse.

• Gear position is held by fail safe function.

STEPCHECKYESNO

1.CHECK ACCELERATOR PEDAL POSITION SENSOR.

1) Connect the Subaru Select Monitor to the data link connector.

2) Turn the ignition switch to ON.

3) Read the data of “Accel. Opening Angle” on the Subaru Select Monitor.

Does the value of accelerator pedal position sensor change from 0% to 100% smoothly when the accelerator pedal is operated from fully closed to fully open?

Check the circuit of the accelerator pedal position sensor.

2.CHECK FRONT VEHICLE SPEED SENSOR.

1) Lift up the vehicle.

2) Start the engine.

3) Set the select lever to the “D” range and slowly increase vehicle speed.

NOTE:

The speed difference between the front and rear wheels will illuminate the ABS warning light or VDC warning light, but this does not indicate a malfunction. If the warning light illuminates, delete the ABS or VDC memory after completing the AT control diagnosis.

Does the vehicle speed displayed by Subaru Select Monitor roughly correspond with vehicle speed indicated by the combination meter?

Check the front vehicle speed sensor circuit.

3.CHECK TORQUE CONVERTER TURBINE SPEED SENSOR.

1) Move the select lever to the “P” or “N” range.

2) Idle the engine.

Does the value of torque converter turbine speed sensor displayed by Subaru Select Monitor roughly correspond with the value of tachometer in combination meter?

There are malfunctions in TCM, TCM connector poor contact, or transmission assembly mechanical malfunction.

Check the torque converter turbine speed sensor circuit.