Inspection Procedure 4: 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, ASTC system, CAN bus system and A/T system diagnosis codes. The M.U.T.-III can also be used to check if the circuits of each input switch 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 set. 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 13B - Troubleshooting, Diagnosis Function ).

Q. Is any diagnosis code set?
Repair the MPI system (Refer to GROUP 13B - Troubleshooting, Inspection Chart for Diagnosis Code ). Then go to Step 10.
Go to Step 3.

STEP 3. Check the A/T system diagnosis code.
Using M.U.T.-III, perform A/T system diagnosis code (Refer to GROUP 23A - Troubleshooting <A/T>, Diagnosis Function ).

Q. Is any diagnosis code set?
Repair the A/T system (Refer to GROUP 23A - Troubleshooting <A/T>, Inspection Chart for Diagnosis Code ). Then go to Step 10.
Go to Step 4.

STEP 4. Check the ASTC system diagnosis code.
Using M.U.T.-III, perform ASTC system diagnosis code (Refer to GROUP 35C - Troubleshooting <ASTC-ECU>, Diagnosis Function ).

Q. Is any diagnosis code set?
Repair the ASTC system (Refer to GROUP 35C - Troubleshooting <ASTC-ECU>, Diagnosis Code Chart ). Then go to Step 10.
Go to Step 5.

STEP 5. Check 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.

Q. Is any diagnosis code set?
Repair the cruise control system. Then go to Step 10.
Go to Step 6.

STEP 6. 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 7.
Refer to - Diagnosis Code Procedures, Code No.P1564: Cruise control switch system. Then go to Step 10.

STEP 7. 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 8.
Refer to - Diagnosis Code Procedures, Code No.P1571: Stop lamp switch system. Then go to Step 10.

STEP 8. Check the A/T system data list.


Using M.U.T.-III, check the data list (Refer to GROUP 23A - Data List Reference Table ).

  • Item 24: Inhibitor switch: P
  • Item 25: Inhibitor switch: R
  • Item 26: Inhibitor switch: N
  • Item 27: Inhibitor switch: D

Q. Is the check result normal?
Go to Step 9.
Check the inhibitor switch system [Refer to GROUP 23A - Troubleshooting, Diagnosis Code Procedures Code No. P0707: Inhibitor Switch System (Open Circuit) , Code No. P0708: Inhibitor Switch System (Short Circuit) ]. 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 13B - Engine-ECU ). Then go to Step 10.

STEP 10. Check the symptom.

Q. Can cruise control be set?
The procedure is complete.
Return to Step 1.