P0746

DTC P0746: Abnormality in Hydraulic Control System Function

DIAGNOSTIC FUNCTION

TCM determines that the malfunction is present when pulley ratio becomes higher (pulley ratio range: 2.349 to 0.394).

DESCRIPTIONS OF MONITOR METHODS

- The status with the pulley ratio of 3.5 or more continues for 0.1 second or with the pulley ratio of 2.7 or more continues for 0.2 second.

MONITOR EXECUTION

- transmission range:D

- Throttle valve opening : 1/8 or more

- Engine speed : 450 r/min or more

- CVT fluid temperature : from 20 to 180°C (68~356°F)

MONITOR EXECUTION CONDITIONS (OTHER MONITOR AND SENSOR)

Other Monitor (There is no temporary DTC stored in memory for the item monitored below)

- P0741: Abnormality in lockup function

- P0841: Abnormality in line pressure sensor function
Sensor (The sensor below is determined to be normal)

- Not applicable

LOGIC FLOW CHARTS (Monitor Sequence)





DTC SET CONDITIONS

Check Conditions

- Transmission range switch position: D.

- Throttle position sensor voltage: 1.37 volts or more.

- Engine speed: 450 r/min or more.

- Transmission fluid temperature: 20°C (68°F) or more.

- Transmission fluid temperature: 180°C (356°F) or less.

- Voltage of battery: 9 volts or more.

- Voltage of battery: 16 volts or less.
Judgment Criteria

- Pulley ratio (primary pulley ratio/secondary pulley ratio): more than 3.5. (0.1 second)

- Pulley ratio (primary pulley ratio/secondary pulley ratio): more than 2.7. (0.2 second)

OBD-II DRIVE CYCLE PATTERN

transmission range: D (Drive the vehicle for 10 seconds or more while the accelerator opening angle is 20% or more)

PROBABLE CAUSES

- Abnormal line pressure

- Malfunction of TCM

DIAGNOSTIC PROCEDURE

STEP 1. Check other diagnosis codes.

Q. Are other diagnosis codes set?

YES Carry out the appropriate troubleshooting.
NO Go to Step 2.
STEP 2. M.U.T.-III data list

Item 33: Line pressure SOL. output current (Refer to Data List Reference Table Data List Reference Table.)

Q. Is the check result normal?

YES Intermittent malfunction
NO Go to Step 3.
STEP 3. Line Pressure Check

Carry out "hydraulic test"(Refer to Hydraulic Pressure Test).

Q. Is the check result normal?

YES Go to Step 4.
NO Repair according to the hydraulic pressure test diagnosis table.
STEP 4. Symptom recheck after erasing diagnosis code

Q. Is the check result normal?

YES Intermittent malfunction
NO Replace TCM.