Code No. P0712: A/T Fluid Temperature Sensor System (Short Circuit)










DIAGNOSIS CODE SET CONDITIONS



PROBABLE CAUSES



  • Malfunction of the A/T fluid temperature sensor system (Short circuit) circuit
  • Malfunction of the A/T fluid temperature sensor
  • Malfunction of the A/T-ECU

DIAGNOSIS PROCEDURE

STEP 1. Check the A/T-ECU terminal voltage.
[C-137 A/T-ECU connector (vehicle side, connected)]
Turn ON the ignition switch, and check the voltage between terminal No. 39 and No. 50.

  • A/T fluid 20°C: Approx. 2.52 V
  • A/T fluid 80°C: Approx. 0.69 V

Q. Is the check result normal?
Go to Step 6.
Go to Step 2.

STEP 2. Check the A/T fluid temperature sensor.
Refer to .

Q. Is the check result normal?
Go to Step 3.
Replace the valve body assembly.

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

Q. Is the check result normal?
Go to Step 4.
Repair or replace the failure section.

STEP 4. Check the A/T-ECU power supply and earth.

Q. Is the check result normal?
Go to Step 5.
Repair or replace the failure section.

STEP 5. Check the A/T-ECU connector pin terminal and the connection status.

Q. Is there a failure point?
Repair or replace the failure section.
Replace the A/T-ECU.

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

Q. Is the check result normal?
The procedure is complete.
Replace the A/T-ECU.