Code No.P1774 (P0758) Underdrive solenoid valve system




SOLENOID VALVE SYSTEM CIRCUIT




OPERATION




DIAGNOSIS CODE SET CONDITIONS





PROBABLE CAUSES



  • Malfunction of underdrive solenoid valve
  • Damaged harness wires and connectors
  • Malfunction of the engine-A/T-ECU

DIAGNOSIS PROCEDURE


STEP 1. M.U.T.-III diagnosis code


Q. Are diagnosis codes P1775 (P0763) and P1776 (P0768) set?

Go to Step 9.
Go to Step 2.

STEP 2. M.U.T.-III actuator test


Item 2: Underdrive solenoid valve
OK: Operating sound can be heard.

Q. Is the check result normal?

Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
Go to Step 3.

STEP 3. Connector check: C-06 A/T control solenoid valve assembly connector


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 C-06.


Disconnect the connector, and measure the resistance between terminal No.3 and No.9 at the solenoid valve side.
OK: 2.7 - 3.4 Ω (A/T fluid temperature 20°C)

Q. Is the check result normal?

Go to Step 5.
Check the underdrive solenoid valve.

STEP 5. Measure the voltage at engine-A/T-ECU connector D-218.


(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-218 terminal No.137 and earth.
OK: 6 - 9 V

Q. Is the check result normal?

Go to Step 8.
Go to Step 6.

STEP 6. Connector check: D-225 intermediate connector, D-218 engine-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. Check the harness between A/T control solenoid valve assembly connector C-06 terminal No.3 and engine-A/T-ECU connector D-218 terminal No.137.


Check the output line for short and open circuit.

Q. Is the check result normal?

Go to Step 8.
Repair the wiring harness.

STEP 8. M.U.T.-III actuator test


Item 2: Underdrive solenoid valve
OK: Operating sound can be heard.

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 9. Connector check: C-06 A/T control solenoid valve assembly connector


Check for the contact with terminals.

Q. Is the check result normal?

Go to Step 10.
Repair the defective connector.

STEP 10. Measure the resistance at A/T control solenoid valve assembly connector C-06.


Disconnect the connector, and measure the resistance between terminal No.3 and No.9 at the solenoid valve side.
OK: 2.7 - 3.4 Ω (A/T fluid temperature 20°C)

Q. Is the check result normal?

Go to Step 11.
Check the solenoid valve harness.

STEP 11. Connector check: D-110 A/T control relay connector, D-224 intermediate connector


Check for the contact with terminals.

Q. Is the check result normal?

Go to Step 12.
Repair the defective connector.

STEP 12. Check the harness between A/T control solenoid valve assembly connector C-06 terminal No.9 and A/T control relay connector D-110 terminal No.3.


Check the power supply line for short and open circuit.

Q. Is the check result normal?

Go to Step 8.
Repair the wiring harness.