Code No.P1764 (P0712): A/T fluid temperature sensor system


A/T FLUID TEMPERATURE SENSOR SYSTEM CIRCUIT









OPERATION



DIAGNOSIS CODE SET CONDITION



PROBABLE CAUSES



  • Malfunction of the A/T fluid temperature sensor
  • Damaged harness wires and connectors
  • Malfunction of the engine-A/T-ECU

DIAGNOSIS

STEP 1. M.U.T.-III data list
Item 7: A/T fluid temperature sensor (Refer to Data List Table ).

Q. Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
Go to Step 2.

STEP 2. Connector check: C-06 A/T control solenoid valve assembly
Check for the contact with terminals.

Q. Is the check result normal?
Go to Step 3.
Repair the defective connector.

STEP 3. Measure the voltage at A/T control solenoid valve assembly connector C-06.
(1)Disconnect the connector, and measure the voltage between terminal 1 and earth at the wiring harness side.
(2)Turn the ignition switch to the ON position.
OK: 4.5 - 4.9 V

Q. Is the check result normal?
Go to Step 4.
Go to Step 6.

STEP 4. Measure the resistance at A/T control solenoid valve assembly connector C-06.
Disconnect the connector, and measure the resistance between terminal 1 and 2 at the sensor side.
OK:

  • 16.7 - 20.5 kΩ (at 0°C)
  • 7.3 - 8.9 kΩ (at 20°C)
  • 3.4 - 4.2 kΩ (at 40°C)
  • 1.9 - 2.2 kΩ (at 60°C)
  • 1.0 - 1.2 kΩ (at 80°C)
  • 0.57 - 0.69 kΩ (at 100°C)

Q. Is the check result normal?
Go to Step 5.
Replace the A/T fluid temperature sensor.

STEP 5. M.U.T.-III data list
Item 7: A/T fluid temperature sensor (Refer to Data List Table ).

Q. Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
Replace the engine-A/T-ECU.

STEP 6. Measure the voltage at engine-A/T-ECU connector D-217.
(1)Connect A/T control solenoid valve assembly connector C-06.
(2)Turn the ignition switch to the ON position.
(3)Measure the voltage between engine-A/T-ECU connector D-217 terminal No.119 and earth.
OK:

  • 3.8 - 4.0 V (at 20°C)
  • 3.2 - 3.4 V (at 40°C)
  • 1.7 - 1.9 V (at 80°C)

Q. Is the check result normal?
Go to Step 5.
Go to Step 7.

STEP 7. Connector check: D-225 intermediate connector, D-217 engine-A/T-ECU connector
Check for the contact with terminals.

Q. Is the check result normal?
Go to Step 8.
Repair the defective connector.

STEP 8. Check the harness between A/T control solenoid valve assembly connector C-06 terminal No.1 and engine-A/T-ECU connector D-217 terminal No.119.
Check the output line for short circuited and open circuit.

Q. Is the check result normal?
Go to Step 5.
Repair the wiring harness.