Code No.P1764 (P0710) A/T fluid temperature sensor system


A/T FLUID TEMPERATURE SENSOR SYSTEM CIRCUIT


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OPERATION


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DIAGNOSIS CODE SET CONDITION


If the A/T fluid temperature sensor output voltage has been approximately 0 V for at least one second (indicating abnormally high oil temperature), it indicates that the A/T fluid temperature sensor circuit is shorted and diagnosis code No.1764 (P0710) is set.

PROBABLE CAUSES



DIAGNOSIS

STEP 1. M.U.T.-III data list
Item 07: 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: B-15 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 B-15.

(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 B-15.

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 07: 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 A/T-ECU.

STEP 6. Measure the voltage at A/T-ECU connector C-12.
(1)Connect A/T control solenoid valve assembly connector B-15.
(2)Turn the ignition switch to the ON position.

(3)Measure the voltage between A/T-ECU connector C-12 terminal No.44 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: B-10 intermediate connector, C-12 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 B-15 terminal No.1 and A/T-ECU connector C-12 terminal No.44.


Check the output line for short-circuited or open circuit.

Q. Is the check result normal?

Go to Step 5.

Repair the wiring harness.