Continuously Variable Transmission/Transaxle, CVT

DTC P0712: Malfunction of Transmission Fluid Temperature Sensor (Short)
DTC P0713: Malfunction of Transmission Fluid Temperature Sensor (Open)














DIAGNOSTIC FUNCTION
TCM conducts fault detection by monitoring the terminal voltage of the transmission fluid temperature sensor.
^ [P0712]: If transmission fluid temperature equals or exceeds specified value, TCM judges that transmission fluid temperature sensor has a failure.
^ [P0713]: If transmission fluid temperature is below specified value even after test driving for more than the specified period, the TCM judges that the transmission fluid temperature sensor has a failure.

DESCRIPTIONS OF MONITOR METHODS [P0712]
^ TCM detects the fluid temperature 180°C (356°F) or more for 5 seconds.

MONITOR EXECUTION [P0712]
^ Continuous

MONITOR EXECUTION CONDITIONS (OTHER MONITOR AND SENSOR) [P0712]

Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
^ P0741: Abnormality in lockup function
^ P0746: Abnormality in hydraulic control system function
^ P0841: Abnormality in line pressure sensor function

Sensor (The sensor below is determined to be normal)
^ Not applicable

LOGIC FLOW CHARTS (Monitor Sequence) [P0712]





DTC SET CONDITIONS [P0712]

Check Conditions
^ Voltage of battery: 9 volts or more.
^ Voltage of battery: 16 volts or less.

Judgment Criteria
^ Value of temperature of transmission fluid: 180°C (356°F) or more. (5 seconds)

OBD-II DRIVE CYCLE PATTERN [P0712]
Ignition switch : ON (start the engine and keep it for 10 seconds or more)

DESCRIPTIONS OF MONITOR METHODS [P0713]
^ TCM detects the fluid temperature -40°C (-40°F) or less for five seconds.

MONITOR EXECUTION [P0713]
^ Vehicle speed 10 km/h or more has been detected during 1 drive cycle

MONITOR EXECUTION CONDITIONS (OTHER MONITOR AND SENSOR) [P0713]

Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
^ P0741: Abnormality in lockup function
^ P0746: Abnormality in hydraulic control system function
^ P0841: Abnormality in line pressure sensor function

Sensor (The sensor below is determined to be normal)
^ Not applicable

LOGIC FLOW CHARTS (Monitor Sequence) [P0713]





DTC SET CONDITIONS [P0713]

Check Conditions
^ After vehicle speed: 10 km/h (6.2 mph) or more.
^ Voltage of battery: 9 volts or more.
^ Voltage of battery: 16 volts or less.

Judgment Criteria
^ Value of temperature of transmission fluid: -40°C (-40°F) or less. (5 seconds)

OBD-II DRIVE CYCLE PATTERN [P0713]
transmission range: D (Drive the vehicle for 10 seconds or more while the accelerator opening angle is 20% or more)

PROBABLE CAUSES
^ Malfunction of the valve body assembly (Faulty transmission fluid temperature sensor)
^ Damaged wiring harness and connectors
^ Malfunction of TCM

DIAGNOSIS

STEP 1. M.U.T.-III data list
Item 5: Transmission fluid temperature sensor signal (Refer to Data List Reference Table). Data List Reference Table

Q:Is the check result normal?
YES : Intermittent malfunction
NO : Go to Step 2.

STEP 2. Check the following connector:
^ B-08 Transmission assembly connector
^ C-40 TCM connector
^ A-09 Intermediate connector
Check the terminals for a contact status problem and internal short circuit.

Q:Is the check result normal?
YES : Go to Step 3.
NO : Repair the defective connector.

STEP 3. Check for open circuit and short to ground in the wiring harness between the CVT assembly connector and the TCM connector
Between B-08 CVT assembly connector (terminal No.17) and C-40 TCM connector (terminal No.50)

Q:Is the check result normal?
YES : Go to Step 4.
NO : Repair the wiring harness.

STEP 4. Check for open circuit in the wiring harness between the CVT assembly connector and the TCM connector
Between B-08 CVT assembly connector (terminal No.19) and C-40 TCM connector (terminal No.48)

Q:Is the check result normal?
YES : Go to Step 5.
NO : Repair the wiring harness.

STEP 5. Transmission fluid temperature sensor check Testing and Inspection

Q:Is the check result normal?
YES : Go to Step 6.
NO : Replace the valve body assembly.

STEP 6. Symptom recheck after erasing diagnostic trouble code

Q:Is the check result normal?
YES : Intermittent malfunction
NO : Replace TCM.