Code No.P0720: Output shaft speed sensor system


















OPERATION


The output shaft speed sensor detects the speed of parking gear, and sends the pulse signal to A/T-ECU.

DIAGNOSIS CODE SET CONDITIONS


While the engine is running, if any output shaft speed sensor pulse signal is not detected even when the input shaft speed sensor pulse signal is detected (1 drive cycle), code No.P0720 is set.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list
Item 6: Output shaft speed sensor (Refer to data list reference table ).

Q. Is the check result normal?
Go to Step 8.
Go to Step 2.

STEP 2. Connector check: C-07 output shaft speed sensor connector
Check for the contact with terminals.

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

STEP 3. Measure the resistance at output shaft speed sensor connector C-07.
Disconnect the connector, and measure the resistance between terminal 1 and 2 at the sensor side.
OK: 560 - 680 Ω (at 20°C)

Q. Is the check result normal?
Go to Step 4.
Go to Step 13.

STEP 4. Measure the resistance at output shaft speed sensor connector C-07.
Disconnect the connector, and measure the resistance between terminal 2 and earth at the wiring harness side.
OK: 2 Ω or less

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

STEP 5. Connector check: D-139 A/T-ECU connector, D-225 intermediate connector
Check for the contact with terminals.

Q. Is the check result normal?
Go to Step 6.
Repair the defective connector.

STEP 6. Check the harness between output shaft speed sensor connector C-07 terminal No.2 and A/T-ECU connector D-139 terminal No.40.
Check the earth line for open circuit.

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

STEP 7. Shielded wire check
Check the shielded wire for any damage.

Q. Is the check result normal?
Go to Step 8.
Repair the wiring harness.

STEP 8. Check whether the diagnosis code is reset.
Check again if the diagnosis code is set.

Q. Is diagnosis code No.P0720 set?
Replace the A/T-ECU.
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

STEP 9. Measure the voltage at output shaft speed sensor connector C-07.
(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 - 5.1 V

Q. Is the check result normal?
Go to Step 14.
Go to Step 10.

STEP 10. Connector check: D-139 A/T-ECU connector, D-225 intermediate connector
Check for the contact with terminals.

Q. Is the check result normal?
Go to Step 11.
Repair the defective connector.

STEP 11. Check the harness between output shaft speed sensor connector C-07 terminal No.1 and A/T-ECU connector D-139 terminal No.32.
Check the power supply line for open and short circuit.

Q. Is the check result normal?
Go to Step 12.
Repair the wiring harness.

STEP 12. Shielded wire check
Check the shielded wire for any damage.

Q. Is the check result normal?
Go to Step 8.
Repair the wiring harness.

STEP 13. Check the input shaft speed sensor
Remove the output shaft speed sensor. Remove deposits such as foreign material or metal chip from the sensor tip, and check the sensor for damage and any faults.

Q. Is the check result normal?
Go to Step 8.
Replace the output shaft speed sensor.

STEP 14. Parking gear inspection
Visually check the parking gear for damage.

Q. Is the check result normal?
Eliminate the cause of the noise.
Replace the parking gear.