Code No. P1758: Low-Reverse Brake Shift Solenoid Valve System


SOLENOID VALVE SYSTEM CIRCUIT



DIAGNOSIS CODE SET CONDITIONS



PROBABLE CAUSES



  • Malfunction of the low-reverse brake shift solenoid valve system circuit
  • Damaged harness or connector
  • Malfunction of the A/T-ECU
  • Malfunction of the low-reverse brake shift solenoid valve (valve body assembly)

DIAGNOSIS PROCEDURE

STEP 1. Check the A/T-ECU terminal voltage.
[C-137 A/T-ECU connector (vehicle side, connected)]
Measure the voltage between the terminal No. 51 and body earth.

  • Reverse and 1st coast: System voltage
  • Other than above: 0 V

Q. Is the check result normal?
Go to Step 5.
Go to Step 2.

STEP 2. Check between the A/T-ECU connector and A/T control solenoid valve assembly connector.
Check for continuity between C-137 A/T-ECU connector and B-132 A/T control solenoid valve assembly connector.

  • Between C-137 terminal No. 51 and B-132 terminal No. 17: Continuity exists.
When the continuity check result is OK, check that the wiring harness is not shorted to the body and other wiring harness.

Q. Is the check result normal?
Go to Step 3.
Repair or replace the failure section.

STEP 3. Check the low-reverse brake shift solenoid.
Refer to .

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

STEP 4. Check between the A/T control solenoid valve assembly connector and the low-reverse brake shift solenoid valve connector.
Check for continuity between the B-132 A/T control solenoid valve assembly connector terminals and the low-reverse brake shift solenoid valve connector terminals.

  • Between B-132 terminal No. 17 and low-reverse brake shift solenoid valve: Continuity exists.

Q. Is the check result satisfactory?
Replace the valve body assembly.
Repair or replace the failure section.

STEP 5. Check the A/T-ECU and A/T control solenoid valve assembly connector pin terminals and the connection status.

Q. Is the check result normal?
Go to Step 7.
Repair or replace the failure section.

STEP 6. Check the A/T-ECU and A/T control solenoid valve assembly connector pin terminals and the connection status.

Q. Is the check result normal?
Replace the A/T-ECU.
Repair or replace the failure section.

STEP 7. Erase the diagnosis code, and drive the vehicle for a while.
Check that the normal code is displayed.

Q. Is the check result normal?
The procedure is complete.
Return to START.