Inspection Procedure 7: Hunting (Repeated Acceleration and Deceleration) Occurs at the Set Vehicle Speed <4D5-M/T>.


COMMENTS ON TROUBLE SYMPTOM


The vehicle speed sensor or the diesel fuel system is suspected.

PROBABLE CAUSE



DIAGNOSIS PROCEDURE

STEP 1. Check the diesel fuel system diagnosis code.
Using M.U.T.-III, perform diesel fuel system diagnosis code (Refer to GROUP 13E - Troubleshooting, Diagnosis Function ).

Q. Is any diagnosis code set?
Repair the diesel fuel system (Refer to GROUP 13E - Troubleshooting, Inspection Chart for Diagnosis Code ). Then go to Step 4.
Go to Step 2.

STEP 2. Check the data list.
Using M.U.T.-III, check the data list (Refer to Data List Reference Table ).

  • Item 04: Vehicle speed signal

Q. Is the check result normal?
Go to Step 3.
Replace the engine-ECU (Refer to GROUP 13E - Engine-ECU ). Then go to Step 4.

STEP 3. Check the symptom.

Q. Does a hunting occur?
Replace the engine-ECU (Refer to GROUP 13E - Engine-ECU ). Then go to Step 4.
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).

STEP 4. Check the symptom.

Q. Does a hunting occur?
Return to Step 1.
The procedure is complete.