A/T

DTC P0712: Transmission Fluid Temperature Sensor System (Short Circuit)





DESCRIPTIONS OF MONITOR METHODS
^ All the following conditions are detected for 10 minutes continuously: Vehicle speed ] 10 km/h (6.2 mph), "D" range and accelerator angle ] 1/8, oil temperature ] 180°C (356°F).

MONITOR EXECUTION
^ Continuous

MONITOR EXECUTION CONDITIONS (OTHER MONITOR AND SENSOR)

Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
^ Not applicable

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

LOGIC FLOW CHARTS (Monitor Sequence)

Logic Flow Charts (Monitor Sequence):

DTC SET CONDITIONS

Check Conditions
^ Vehicle speed: more than 10 km/h (6.2 mph).
^ Transmission range switch position: D.
^ Throttle opening: more than 1/8.
^ Engine speed: more than 305 r/min.

Judgment Criteria
^ Value of temperature of transmission fluid: more than 180°C (356°F). (10 minutes)

OBD-II DRIVE CYCLE PATTERN
Start the engine, keep the vehicle stopped in "P" range for 5 seconds.

TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THIS CODE TO BE SET ARE:)
^ Malfunction of the transmission fluid temperature sensor system (Short circuit) circuit
^ Malfunction of the transmission fluid temperature sensor
^ Malfunction of the TCM

DIAGNOSIS

STEP 1. Check the TCM terminal voltage.
[C-38 TCM connector (vehicle side, connected)]

Turn ON the ignition switch, and check the voltage between terminal No. 39 and No. 50.

^ Transmission fluid 20°C (68°F): Approx. 2.52 V
^ Transmission fluid 80°C (176°F): Approx. 0.69 V

Q:Is the check result normal?
YES: Go to Step 6.
NO: Go to Step 2.

STEP 2. Check the transmission fluid temperature sensor.

Q:Is the check result normal?
YES: Go to Step 3.
NO: Replace the valve body assembly.

STEP 3. Check the wiring harness between the transmission fluid temperature sensor and TCM.
Check that the wiring harness between the A/T control solenoid valve assembly connector and TCM is not shorted to the body and other wiring harness.

Q:Is the check result normal?
YES: Go to Step 4.
NO: Repair or replace the failure section.

STEP 4. Check the TCM power supply and ground.

Q:Is the check result normal?
YES: Go to Step 5.
NO: Repair or replace the failure section.

STEP 5. Check the TCM connector pin terminal and the connection status.

Q:Is there a failure point?
YES: Repair or replace the failure section.
NO: Replace the TCM.

STEP 6. Erase the DTC code, and drive the vehicle for a while.
Check that the normal code is displayed.

Q:Is the check result normal?
YES: The procedure is complete.
NO: Replace the TCM.