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.
CAN communication Circuit Inspection
- Connect all unit/module's connector.
- IG key "ON", Engine "OFF".
- Measure the voltage between "M-CAN High" terminal of CGW* harness connector and chassis ground.
- Measure the voltage between "M-CAN Low" terminal of CGW* harness connector and chassis ground.
Specification: Below 5V(1.5V~3.5V)
- Is the measured value within specifications?
YES
- Disconnect M-CAN communication unit/module one by one and monitor DTC to find the cause.
→ If the DTC erase, substitute with a known-good unit/module and check for proper operation.
→ If the problem is corrected, replace the unit/module.
→ Go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO
- If the measured value is the battery voltage level(12V),
→ Repair short between the harness and the battery power.
- If the measured value is the ground level (0V),
→ Repair short between "M-CAN High" line and "M-CAN Low" line.
→ Repair open/poor connection in the harness.
→ Repair short between the harness and the chassis ground.
NOTE: CGW* : "IGPM_GATEWAY"
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.