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.
Component Inspection
- Ignition "OFF" & Engine "OFF".
- Ignition "ON" & Engine "OFF".
- Connect GDS and select "Diagnostic Trouble Codes (DTCs)" mode.
- Using a GDS, Clear DTC.
- Using a GDS, Check DTC present.
- Are any DTCs present?
YES
This fault may be caused by an invalid CAN messages from TCM.
Check if there is a problem in the TCM system side.
After repairing the fault of the TCM system side, Go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO
This fault may be intermittently caused by poor connection in the TCM or HECU connector or was repaired and HECU memory was not cleared. Go to "VERIFICATION OF VEHICLE REPAIR " procedure.
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.