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
- IG "OFF".
- IG "ON".
- Connect GDS and select "Diagnostic Trouble Codes(DTCs)" mode.
- Using a GDS, Clear DTC.
- Select "Diagnostic Trouble Codes(DTCs)" mode again.
- Are any DTCs present?
YES
Substitute with a known-good HECU and check for proper operation. If problem is corrected, replace HECU and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NOTE: In a case of replacing HECU, operate following functionsNO
Fault is intermittent caused by faulty HECU 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
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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.