Inspection Procedure 3: When the Selector Lever is Moved to "N" Range, Auto-cruise Control is not Cancelled <A/T>.


OPERATION


When the selector lever is operated, the selector lever signal from the inhibitor switch is sent to the A/T-ECU. Engine-ECU receives the selector lever position signal from the A/T-ECU via the CAN bus line.

COMMENTS ON TROUBLE SYMPTOM


The inhibitor switch circuit is suspected.
Connector(s), wiring harness in the CAN bus line between the engine-ECU and the A/T-ECU, power supply to the engine-ECU, the A/T-ECU, the engine-ECU may be defective.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnosis.
Using M.U.T.-III, perform CAN bus line diagnosis (Refer to GROUP 54D - Explanation About The M.U.T.-III CAN Bus Diagnostics ).

Q. Is the check result satisfactory?
Go to Step 2.
Repair the CAN bus lines (Refer to GROUP 54D - Diagnosis, Can Bus Diagnostic Table ). Then go to Step 4.

STEP 2. A/T system M.U.T.-III data list.
Item 34: Inhibitor switch (Refer to GROUP 23A - Troubleshooting A/T, Data List Reference Table ).

Q. Is the check result normal?
Go to Step 3.
Check the inhibitor switch system [Refer to GROUP 23A - Troubleshooting <A/T>, Diagnosis Code Procedures, DTC P1770: Inhibitor switch system (Open Circuit) , DTC P1771: Inhibitor switch system (Short Circuit) ]. Then go to Step 4.

STEP 3. Retest the system.

Q. Does the selector lever moved to "N" range, auto-cruise control system is cancelled?
It can be assumed that this malfunction is intermittent (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points, How to Cope with Intermittent Malfunction ).
Replace the engine-ECU (Refer to GROUP 13D - Engine-ECU ). Then go to Step 4.

STEP 4. Retest the system.

Q. Does the selector lever moved to "N" range, auto-cruise control system is cancelled?
The procedure is complete.
Return to Step 1.