Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Diagnosis System
- DESCRIPTION
- The active control engine mount ECU controls the functions of the CAN communication system on the vehicle. Data of the CAN communication system and the Diagnostic Trouble Codes (DTCs) can be read through the Data Link Connector 3 (DLC3) of the vehicle.
- CHECK DLC3
The vehicle's ECU uses ISO 15765-4 for communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.
DLC3 CONNECTOR - TERMINALS REFERENCE CHARTSymbols Terminal No. Names Reference terminal Results Condition SIL 7 Bus "+" line 5 - Signal ground Pulse generation During transmission CG 4 Chassis ground Body ground 1 Ω or less Always SG 5 Signal ground Body ground 1 Ω or less Always BAT 16 Battery ground Body ground 9 to 14 V Always CANH 6 CAN "High" line CANL 54 to 69 Ω Engine switch off CANH 6 CAN "High" line Battery positive 6 kΩ or higher Engine switch off CANH 6 CAN "High" line CG 200 Ω or higher Engine switch off CANL 14 CAN "Low" line Battery positive 6 kΩ or higher Engine switch off CANL 14 CAN "Low" line CG 200 Ω or higher Engine switch off HINT:
The DLC3 is the interface prepared for reading various data from the vehicle's ECU. After connecting the cable of Techstream, turn the engine switch on (IG) and turn the tester on. If a communication failure message is displayed on the tester screen, a problem exists in either the vehicle or tester. In order to identify the location of the problem, connect the tester to another vehicle. If communication is normal: Inspect the DLC3 on the original vehicle.
If communication is still not possible: The problem is probably in the tester itself. Consult the Service Department listed in the instruction manual.
- Techstream
HINT:
Connect the cable of Techstream to the DLC3, turn the engine 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.
- Techstream
- INSPECT BATTERY VOLTAGE
Standard Voltage:
11 to 14 V
If the voltage is below 11 V, recharge or replace the battery before proceeding.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
No obligation. See pricing before you book.