Diagnosis System
- DIAGNOSIS FUNCTION
- The diagnosis function makes the master warning light and the multi-information display come on, and the CRUISE main indicator light blinks as shown in the illustration. When a malfunction occurs in the dynamic radar cruise control system, the DTCs are stored in the ECM.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NOTE:- The master warning light goes off if the system returns to normal condition.
- Since the stored data in the ECM is erased by disconnecting the EFI and ETCS fuses or the battery terminal, do not disconnect them until the inspection has been completed.
- The diagnosis function makes the master warning light and the multi-information display come on, and the CRUISE main indicator light blinks as shown in the illustration. When a malfunction occurs in the dynamic radar cruise control system, the DTCs are stored in the ECM.
- DESCRIPTION
- The ECM controls the dynamic radar cruise control system of the vehicle. The data and DTCs relating to the dynamic radar cruise control system can be read from the DLC3 of the vehicle. If either DTC or CRUISE OK is not displayed on the multi-information display on the combination meter when checking for DTCs, there may be a problem with either the combination meter or the CAN communication and multiplex communication systems. Use the Techstream to check and solve the problem.
- CHECK DLC3
- The vehicle's ECM uses the ISO 15765-4 for communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.CONNECTOR TERMINAL REFERENCE CHART
Terminal No. (Symbols) Terminal Description Condition Specified Condition J21-7 (SIL) - J21-5 (SG) Bus "+" line During transmission Pulse generation J21-4 (CG) - Body ground Chassis ground Always Below 1 Ω J21-5 (SG) - Body ground Signal ground Always Below 1 Ω J21-16 (BAT) - Body ground Battery positive Always 11 to 14 V J21-6 (CANH) - J21-14 (CANL) HIGH-level CAN bus line Engine switch off 54 to 67 Ω J21-6 (CANH) - Battery positive HIGH-level CAN bus line Engine switch off 1 MΩ or higher J21-6 (CANH) - J21-4 (CG) HIGH-level CAN bus line Engine switch off 3 kΩ or higher J21-14 (CANL) - Battery positive LOW-level CAN bus line Engine switch off 1 MΩ or higher J21-14 (CANL) - J21-4 (CG) LOW-level CAN bus line Engine switch off 3 kΩ or higher If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector.
HINT:
Connect the cable of the Techstream to the DLC3, turn the engine switch on (IG), and attempt to use the Techstream. If the display indicates that a communication error has occurred, there is a problem either with the vehicle or the Techstream.
- If communication is normal when the Techstream is connected to another vehicle, inspect the DLC3 on the original vehicle.
- If communication is still not possible when the Techstream is connected to another vehicle, the problem may be in the Techstream itself. Consult the Service Department listed in the Techstream's instruction manual.
- The vehicle's ECM uses the ISO 15765-4 for communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.
- CHECK INDICATOR
- Turn the engine switch on (IG).
- Check that the CRUISE main indicator light and RADAR READY indicator come on when the main switch ON-OFF button is pushed on, and that the indicator light and the indicator go off when the ON-OFF button is pushed off.
HINT:
- If the indicator check result shows a problem, proceed to HOW TO PROCEED WITH TROUBLESHOOTING for the combination meter article.
- If a malfunction occurs in the vehicle speed sensors, the stop light switch, or other related parts during cruise control driving, the ECU actuates AUTO CANCEL of the cruise control and blinks the CRUISE main indicator light. This indicator light informs the driver of the malfunction. At the same time, the malfunction is stored as a diagnostic trouble code.