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
2014 Hyundai Equus SignatureSECTION Component Inspection
- Check CAN communication waveform generation
- Ignition "OFF".
- Disconnect CAN communication modules. (AFLS ECU, ECM, TCU, ABS/ESP ECU, EHPS, ECS, 4WD, steering angle sensor)
- Connect 2 channel scope to DLC CAN HIGH terminal and CAN LOW terminal.
- IG KEY "ON" after connecting only AFLS ECU to CAN BUS.
(IG KEY "ON" after connecting only "the Control Module(s) to be checked" to CAN BUS.)
Specification:
- Does correct waveform generate from each module?
YES
- Replace the module which generates poor communication waveform, and go to "VERIFICATION OF VEHICLE REPAIR ".
NO
- Fault is intermittent caused by poor contact in the sensor's and/or ECU's connector or was repaired and ECU memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
RENDER: 1.0x
NO RELATED
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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.