AUTOMATIC TRANSMISSION (DIAGNOSTICS)(4AT)(D) > 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 value of Accel. opening angle on Subaru Select Monitor display.

Does the value of Accel. opening angle change from 0% to 100% smoothly when throttle is operated from fully closed to fully open?

Check the accelerator pedal position sensor circuit.

2.CHECK FRONT VEHICLE SPEED SENSOR.

1) Lift up the vehicle and support with rigid racks.

2) Start the engine.

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

NOTE:

The speed difference between front and rear wheels may illuminate the ABS warning light, but this indicates no malfunction. When AT control diagnosis is finished, perform the ABS or VDC clear memory of on-board diagnostics system.

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 “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.