Code No.P1763 (P0710) A/T fluid temperature sensor system












OPERATION



  • The A/T fluid temperature sensor converts the A/T fluid temperature to voltage, and send the information to the A/T-ECU.
  • The A/T fluid temperature rises, the resistance decreases. Thus, the sensor output voltage depends on the A/T fluid temperature. As the A/T fluid temperature rises, the output voltage will decrease.

DIAGNOSIS CODE SET CONDITIONS



PROBABLE CAUSES



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

DIAGNOSIS PROCEDURE

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. 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 3.
Replace the A/T fluid temperature sensor.

STEP 3. 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 4.
Repair the defective connector.

STEP 4. Measure the resistance at A/T control solenoid valve assembly connector B-15.
Disconnect the connector, and measure the resistance between terminal 2 and earth at the wiring harness side.
OK: Continuity (Less than 2 Ω)

Q. Is the check result normal?
Go to Step 9.
Go to Step 5.

STEP 5. 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.43 and earth.
OK: 0.5 V or less

Q. Is the check result normal?
Go to Step 8.
Go to Step 6.

STEP 6. Connector check: C-12 A/T-ECU connector
Check for the contact with terminals.

Q. Is the check result normal?
Go to Step 7.
Repair the defective connector.

STEP 7. 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 8. Connector check: B-11 intermediate connector, C-12 A/T-ECU connector
Check for the contact with terminals.

Q. Is the check result normal?
Go to Step 14.
Repair the defective connector.

STEP 9. 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 7.
Go to Step 10.

STEP 10. 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 12.
Go to Step 11.

STEP 11. Connector check: C-12 A/T-ECU connector
Check for the contact with terminals.

Q. Is the check result normal?
Go to Step 7.
Repair the defective connector.

STEP 12. 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 13.
Repair the defective connector.

STEP 13. 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 7.
Repair the wiring harness.

STEP 14. Check the harness between A/T control solenoid valve assembly connector B-15 terminal No.2 and A/T-ECU connector C-12 terminal No.43.
Check the earth line for open circuit.

Q. Is the check result normal?
Go to Step 7.
Repair the wiring harness.