Diagnosis System
- DESCRIPTION
- When troubleshooting a vehicle with the diagnostic system, the only difference from the usual troubleshooting procedure is connecting the Techstream to the vehicle and reading various data output from the vehicle's multiplex tilt and telescopic ECU.
The multiplex tilt and telescopic ECU records DTCs when the ECU detects a malfunction in the computer itself or in its circuits.
To check the DTCs, connect the Techstream to the DLC3 on the vehicle. The Techstream enables you to clear the DTCs, activate several actuators, and check the freeze frame data and various forms of steering data.
- When troubleshooting a vehicle with the diagnostic system, the only difference from the usual troubleshooting procedure is connecting the Techstream to the vehicle and reading various data output from the vehicle's multiplex tilt and telescopic ECU.
- DLC3 CHECK
- The multiplex tilt and telescopic ECU uses ISO 15765-4 for communication. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.
Symbol (Terminal No.) Terminal Description Condition Specified Condition SIL (7) - SG (5) Bus "+" line During communication Pulse generation CG (4) - Body ground Chassis ground Always Below 1 Ω SG (5) - Body ground Signal ground Always Below 1 Ω BAT (16) - Body ground Battery positive Always 11 to 14 V CANH (6) - CANL (14) CAN bus line Engine switch off* 54 to 67 Ω CANH (6) - CG (4) HIGH-level CAN bus line Engine switch off* 200 Ω or higher CANL (14) - CG (4) LOW-level CAN bus line Engine switch off* 200 Ω or higher CANH (6) - BAT (16) HIGH-level CAN bus line Engine switch off* 6 kΩ or higher CANL (14) - BAT (16) LOW-level CAN bus line Engine switch off* 6 kΩ or higher NOTE:*: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the engine switch, any other switches or the doors.
HINT:
If the display shows a communication error message after connecting the Techstream cable to the DLC3 and turning the engine switch on (IG), there is a problem either with the vehicle or the Techstream.
- If communication is normal when connecting the Techstream to another vehicle, inspect the DLC3 on the original vehicle.
- If communication is still not possible when connecting the Techstream to another vehicle, the problem is probably in the Techstream itself. Consult the Service Department listed in the Techstream operator's manual.
- The multiplex tilt and telescopic ECU uses ISO 15765-4 for communication. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.