Inspection Procedure 5: Cruise Control cannot be Set (No Response SET - Switch and RES + Switch is Pressed).




COMMENTS ON TROUBLE SYMPTOM


The fail-safe function is probably cancelling cruise control system. In this case, checking the cruise control system, MPI system, CAN bus system and CVT system diagnosis codes. The M.U.T.-III can also be used to check if the circuits of each input switches are normal or not by checking the data list.
note Press the cruise control switches one by one securely. Otherwise, the cruise control system may not be started.

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 satisfactory?

Go to Step 2.
Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting, Can Bus Diagnostic Table ). Then go to Step 10.

STEP 2. Check the MPI system diagnosis code.


Using M.U.T.-III, perform MPI system diagnosis code (Refer to GROUP 13A - Troubleshooting, Diagnosis Function <4B1>, GROUP 13C - Troubleshooting, Diagnosis Function <4J1>).

Q. Is any diagnosis code stored?

Repair the MPI system (Refer to GROUP 13A - Troubleshooting, Inspection Chart for Diagnosis Code <4B1>, GROUP 13C - Troubleshooting, Inspection Chart for Diagnosis Code <4J1>). Then go to Step 10.
Go to Step 3 <CVT>
Go to Step 4 <M/T>

STEP 3. Check the CVT system diagnosis code.


Using M.U.T.-III, perform CVT system diagnosis code (Refer to GROUP 23A - Troubleshooting, Diagnosis Function ).

Q. Is any diagnosis code stored?

Repair the CVT system (Refer to GROUP 23A - Troubleshooting, Inspection Chart for Diagnosis Code ). Then go to Step 10.
Go to Step 4.

STEP 4. Read the diagnosis code.


(1)Use the M.U.T.-III, erase the diagnosis code of the cruise control system.
(2)Turn the ignition switch to the "ON" position, and press the cruise control ON/OFF switch to turn the cruise control system to ON (turn ON the cruise control indicator lamp).
(3)After turning the cruise control system to ON, when 2 minutes or more has elapsed without operating the cruise control switches.
(4)With the cruise control switches not operated, depress the brake pedal for several seconds, and then read the diagnosis code of the cruise control system (Refer to .)

Q. Is any diagnosis code stored?

Repair the cruise control system (Refer to - Diagnosis Code Chart). Then go to Step 10.
Go to Step 5.

STEP 5. Check the data list.


Using M.U.T.-III, check the data list (Refer to data list reference table ).

  • Item 75: CANCEL switch
  • Item 86: Cruise control ON/OFF switch
  • Item 91: RES + switch
  • Item 92: SET - switch

Q. Is the check result normal?

Go to Step 6.
Check the cruise control switch system (Refer to - Diagnosis Code Procedures, Code No. P0578: Abnormal voltage at cruise control switch). Then go to Step 10.

STEP 6. Check the data list.


Using M.U.T.-III, check the data list (Refer to data list reference table ).

  • Item 74: Stop lamp switch
  • Item 89: Brake switch

Q. Is the check result normal?

Go to Step 7 <CVT>
Go to Step 8 <M/T>
Check the stop lamp switch system (Refer to - Diagnosis Code Procedures, Code No. P0504: Malfunction of the stop lamp switch system). Then go to Step 10.

STEP 7. Check the data list. <CVT>


Using M.U.T.-III, check the data list (Refer to data list reference table ).

  • Item 88: Inhibitor switch

Q. Is the check result normal?

Go to Step 9.
Check the CVT system (Refer to GROUP 23A - Troubleshooting, Inspection Procedures for Diagnosis Code, Code No.P0705: Malfunction of Inhibitor Switch ) . Then go to Step 10.

STEP 8. Check the data list. <M/T>


Using M.U.T.-III, check the data list (Refer to data list reference table ).

  • Item 78: clutch switch

Q. Is any diagnosis code stored?

Go to Step 9.
Check the clutch switch system (Refer to - Symptom Procedures, Inspection Procedure 2). Then go to Step 10.

STEP 9. 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 engine-ECU (Refer to GROUP 13A - Engine-ECU <4B1>, GROUP 13C - Engine-ECU <4J1>). Then go to Step 10.

STEP 10. Check the symptom.


Q. Can cruise control be set?

The procedure is complete.
Return to Step 1.