Diagnosis System
- CHECK DLC3
HINT:
The vehicle uses the ISO 15765-4 communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.
DLC3 TERMINALS RESISTANCE SPECIFICATIONSymbols (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 10 to 14 V CANH (6) - CANL (14) HIGH-level CAN bus line Power switch OFF(1) 54 to 69 Ω CANH (6) - CG (4) HIGH-level CAN bus line Power switch OFF(1) 1 kΩ or more CANL (14) - CG(4) HIGH-level CAN bus line Power switch OFF(1) 1 kΩ or more CANH (6) - BAT (16) LOW-level CAN bus line Power switch OFF(1) 1 kΩ or more CANL (14) - BAT (16) LOW-level CAN bus line Power switch OFF(1) 1 kΩ or more (1) 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. 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 power switch ON (IG) and attempt to use the Techstream. If the display informs 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 impossible when the tester is connected to another vehicle, the problem is probably in the tester itself. Consult the Service Department listed in the tester's instruction manual.
- INSPECT BATTERY VOLTAGE
Standard:
11 to 14 V
If the voltage is below 11 V, replace the battery before proceeding.