Inspection Procedure 6: When the "ON/OFF" Switch is Turned ON, the Cruise Control Indicator Lamp does not Illuminate (However, the Cruise Control System is Normal).


OPERATION



  • The engine-ECU detects "ON/OFF" switch ON signal to illuminate the cruise control indicator lamp within the combination meter.
  • The cruise control indicator lamp illuminate signal is transmitted from the engine-ECU to the combination meter via CAN bus line.

COMMENTS ON TROUBLE SYMPTOM



  • The CAN bus line between the engine-ECU and the ETACS-ECU and between the ETACS-ECU and the combination meter may be defective.
  • The combination meter, ETACS-ECU or engine-ECU may also be defective.

PROBABLE CAUSES



  • Malfunction of CAN bus system.
  • Damaged harness or connector.
  • Malfunction of the combination meter.
  • Malfunction of the ETACS-ECU.
  • 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 6.

STEP 2. Check the diesel fuel system diagnosis code.
Using M.U.T.-III, perform diesel fuel system diagnosis code (Refer to GROUP 13B - Troubleshooting, Diagnosis Function ).

Q. Is diagnosis code No.U0141 set?
Repair the diesel fuel system (Refer to GROUP 13B - Troubleshooting, Diagnosis Code Procedures, Code No.U0141: ETACS-ECU Time-out ). Then go to Step 6.
Go to Step 3.

STEP 3. Check the ETACS system diagnosis code.
Using M.U.T.-III, perform ETACS system diagnosis code (Refer to GROUP 54A - ETACS, Troubleshooting, Diagnosis Function ).

Q. Is diagnosis code No.U0155 set?
Repair the ETACS system (Refer to GROUP 54A - Troubleshooting, Diagnosis Code Procedures, Code No.U0155: Combination Meter-ECU CAN Communication Time Out ). Then go to Step 6.
Go to Step 4.

STEP 4. Check the combination meter system actuator test.
Using M.U.T.-III, check the combination meter system actuator test (Refer to GROUP 54A - Combination Meter, Troubleshooting, Actuator Test Table ).

  • Item 7: Indicator1

Q. Is the check result normal?
Go to Step 5.
Repair the combination meter system (Refer to GROUP 54A - Combination Meter, Troubleshooting, Symptom Procedures, Inspection Procedure 4 ). Then go to Step 6.

STEP 5. Check the symptom.

Q. When the "ON/OFF" switch is turned ON, is the cruise control indicator lamp illuminated?
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 6.

STEP 6. Check the symptom.

Q. When the "ON/OFF" switch is turned ON, is the cruise control indicator lamp illuminated?
The procedure is complete.
Return to Step 1.