Diagnosis System
- CHECK DLC3
The ECU uses ISO 15765-4 for communication. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.
Symbols (Terminal No.) Terminal Description Condition Specified Condition SIL (7) - SG (5) Bus "+" line During transmission 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 Power switch OFF* 54 to 69 Ω CANH (6) - CG (4) HIGH-level CAN bus line Power switch OFF* 200 Ω or more CANH (6) - BAT (16) HIGH-level CAN bus line Power switch OFF* 6 kΩ or more CANL (14) - CG (4) LOW-level CAN bus line Power switch OFF* 200 Ω or more CANL (14) - BAT (16) LOW-level CAN bus line Power switch OFF* 6 kΩ or more NOTE:*: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the power switch, any other switches or the doors.
HINT:
Connect the cable of the the Techstream to the DLC3, turn the power switch ON (IG) and attempt to use the tester. If the display indicates that a communication error has occurred, there is a problem either with the vehicle or with the tester.
If communication is normal when the tester is connected to another vehicle, inspect the DLC3 of the original vehicle. If communication is still not possible when the tester is connected to another vehicle, the problem may be in the tester itself. Consult the Service Department listed in the tester's instruction manual.
If communication is still not possible when the tester is connected to another vehicle, the problem may be in the tester itself. Consult the Service Department listed in the tester's instruction manual.