Inspection Procedure 5: Cruise Control cannot be Set (No Response when the "COAST/SET" Switch and the "ACC/RES" Switch is Pushed).




COMMENTS ON TROUBLE SYMPTOM



note Push the cruise control switches one by one securely. Otherwise, the cruise control system may not be started.

PROBABLE CAUSE



  • Malfunction of CAN bus system.
  • Malfunction of the diesel fuel system.
  • Malfunction of the A/T system <A/T>.
  • Malfunction of the ASTC system.
  • Malfunction of the cruise control switch.
  • Malfunction of the stop lamp switch.
  • Malfunction of the clutch switch <M/T>.
  • Malfunction of the inhibitor switch <A/T>.
  • Malfunction of the engine-ECU.

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 11.

STEP 2. Check the diesel fuel system diagnosis code.


Using M.U.T.-III, perform diesel fuel system diagnosis code (Refer to GROUP 13A - Troubleshooting, Diagnosis Function ).

Q. Is any diagnosis code set?

Repair the diesel fuel system (Refer to GROUP 13A - Troubleshooting, Inspection Chart for Diagnosis Code ). Then go to Step 11.
Go to Step 4 <M/T>.
Go to Step 3 <A/T>.

STEP 3. Check the A/T system diagnosis code <A/T>.


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

Q. Is any diagnosis code set?

Repair the A/T system (Refer to GROUP 23A - Troubleshooting, Diagnosis Code Chart ). Then go to Step 11.
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, Diagnosis Function ).

Q. Is any diagnosis code set?

Repair the ASTC system (Refer to GROUP 35C - Troubleshooting, Diagnosis Code Chart ). Then go to Step 11.
Go to Step 5.

STEP 5. Read the diagnosis code.


(1)Use the M.U.T.-III, erase the diagnosis code of the cruise control system (Refer to ).
(2)Turn the ignition switch to the "ON" position, and push the "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 use the M.U.T.-III to read the diagnosis code of the cruise control system (Refer to ).

Q. Is any diagnosis code set?

Repair the cruise control system (Refer to - Diagnosis Code Chart). Then go to Step 11.
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 136: "ON/OFF" switch
  • Item 137: "CANCEL" switch
  • Item 138: "COAST/SET" switch
  • Item 139: "ACC/RES" switch

Q. Is the check result normal?

Go to Step 7.
Check the cruise control switch system (Refer to - Diagnosis Code Procedures, Code No.P1564: Abnormal voltage at cruise control switch). Then go to Step 11 .

STEP 7. Check the data list.


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

  • Item 134: Brake switch
  • Item 135: Stop lamp switch

Q. Is the check result normal?

Go to Step 8 <M/T>.
Go to Step 9 <A/T>.
Check the stop lamp switch system (Refer to - Diagnosis Code Procedures, Code No.P1571: Malfunction of the stop lamp switch system). Then go to Step 11 .

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


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

  • Item 131: Clutch switch

Q. Is the check result normal?

Go to Step 10.
Check the clutch switch system (Refer to - Symptom Procedures, Inspection Procedure 2). Then go to Step 11.

STEP 9. Check the data list <A/T>.


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

  • Item 42: Inhibitor switch

Q. Is the check result normal?

Go to Step 10.
Check the inhibitor switch system [Refer to GROUP 23A - Troubleshooting, Diagnosis Code Procedures Code No.P1770: Inhibitor switch system (Open Circuit) , Code No.P1771: Inhibitor switch system (Short Circuit) ] <4A/T> or [Refer to GROUP 23A - Troubleshooting, Diagnosis Code Procedures Code No.P1770: Inhibitor switch system (Open Circuit) , Code No.P1771: Inhibitor switch system (Short Circuit) ] <5A/T>. Then go to Step 11.

STEP 10. 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 Malfunctions ).
Replace the engine-ECU (Refer to GROUP 13A - Engine-ECU ). Then go to Step 11.

STEP 11. Check the symptom.


Q. Can cruise control be set?

The procedure is complete.
Return to Step 1.