Code No.P1770: Inhibitor Switch System (Open Circuit)
















OPERATION



DIAGNOSIS CODE SET CONDITIONS



PROBABLE CAUSES
  • Malfunction of the inhibitor switch
  • Damaged harness wires and connectors
  • Malfunction of the A/T-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list
Item 34: Inhibitor switch (Refer to data list reference table ).

Q. Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
NO <none of the selector lever positions are displayed on M.U.T.-III> : Go to Step 2.
NO <only one of the selector lever positions is not displayed on M.U.T.-III> : Go to Step 6.

STEP 2. Check the inhibitor switch.
Refer to .

Q. Is the check result normal?
Go to Step 3.
Replace the inhibitor switch.

STEP 3. Connector check: B-109 Inhibitor switch connector, C-313 ETACS-ECU connector, A-11 and C-31 intermediate connector, C-30 J/C (4)
Check for the contact with terminals.

Q. Is the check result normal?
Go to Step 4.
Repair the defective connector.

STEP 4. Check the harness between inhibitor switch connector B-109 terminal No.8 and ETACS-ECU connector C-313 terminal No.4.
Check the power supply line for open circuit.

Q. Is the check result normal?
Go to Step 5.
Repair the wiring harness.

STEP 5. M.U.T.-III data list
Item 34: Inhibitor switch (Refer to data list reference 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. Check the inhibitor switch.
Refer to .

Q. Is the check result normal?
Go to Step 7.
Replace the inhibitor switch.

STEP 7. Connector check: A-10 and A-11 intermediate connector, B-109 inhibitor switch connector, C-34 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 inhibitor switch connector B-109 terminal No.3, 7, 4, 1, 5, 2, 6 and A/T-ECU connector C-34 terminal No.65, 63, 66, 64, 59, 58, 57.
Check the output line for open circuit.

Q. Is the check result normal?
Go to Step 5.
Repair the wiring harness.