Inspection Procedure 5: Hunting (Repeated Acceleration and Deceleration) Occurs at the Set Vehicle Speed.




COMMENTS ON TROUBLE SYMPTOM




PROBABLE CAUSES




DIAGNOSIS PROCEDURE


caution
  • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be stored. Prior to this diagnosis, diagnose the CAN bus lines.
  • Before replacing the ECU, ensure that the CAN bus lines is normal.

STEP 1. Check the CAN bus system diagnosis.


Using M.U.T.-III, perform CAN bus diagnosis (Refer to GROUP 54C - Explanation About The M.U.T.-III Can Bus Diagnostics ).

Q. Is the check result normal?

Go to Step 2.
Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting, Can Bus Diagnostic Table ). Then go to Step 6.

STEP 2. M.U.T.-III diagnosis code


Confirm the diagnosis code is stored from the ASC-ECU.

Q. Is diagnosis code stored?

Perform troubleshooting of the active stability control (ASC) system (Refer to GROUP 35C - Troubleshooting - Diagnosis Code Chart ). Then go to Step 6.
Go to Step 3.

STEP 3. Check the PHEV-ECU diagnosis code.


Using M.U.T.-III, perform PHEV-ECU diagnosis code (Refer to GROUP 54D - Troubleshooting, Diagnosis Function ).

Q. Is any diagnosis code stored?

Perform troubleshooting of the PHEV-ECU (Refer to GROUP 54D - Troubleshooting, Diagnosis Code Chart ). Then go to Step 6.
Go to Step 4.

STEP 4. Check the data list.


Using M.U.T.-III, check the PHEV-ECU data list (Refer to GROUP 54D - data list reference table ).

  • Item No.399: Vehicle speed for speed control

Q. Is the check result normal?

Go to Step 5.
Replace the PHEV-ECU (Refer to GROUP 54D - PHEV-ECU ). Then go to Step 6.

STEP 5. Check the symptom.


Q. Can cruise control be set?

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 PHEV-ECU (Refer to GROUP 54D - PHEV-ECU ). Then go to Step 6.

STEP 6. Check the symptom.


Q. Can cruise control be set?

The procedure is complete.
Return to Step 1.