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
Fuel Pressure Regulator Inspection
- Ignition "OFF".
- Connect VMI to KDS and set up an oscilloscope as follow (4-channel);
Channel A (+): Pin No. 1 (High) terminal of Fuel Pressure Regulator.
Channel A (-): Pin No. 2 (Low) terminal of Fuel Pressure Regulator.
Channel B (+): Pin No. 10 (Signal) terminal of Fuel Rail Pressure Sensor joint connector.
- Ignition "ON" & Engine "ON".
- Testing Condition: Idle & Approx. 4500RPM
Specification: Refer to Figure below
- Is the parameter displayed within specification?
YES
- Carefully re-do this troubleshooting guide steps.
- If the diagnostics have been performed correctly with no failure found, replace the ECM/PCM, and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
CAUTION: When replacing the ECM/PCM, the vehicle equipped with the immobilizer must be performed procedure as below.
[In the case of installing used ECM/PCM]- Perform "PCM Neutral mode" procedure with KDS. (Refer to "IMMOBILIZER " in BE group)
- After finishing "ECM/PCM Neutral mode", perform "Key teaching" procedure with KDS. (Refer to "IMMOBILIZER " in BE group)
[In the case of installing new ECM/PCM]
Perform "Key teaching" procedure with KDS. (Refer to "IMMOBILIZER " in BE group)NO
- Carefully re-do this troubleshooting guide steps.
- If no problems were found with the circuits or connectors, Replace the Fuel Pressure Regulator and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
- If no problems were found with the circuits or connectors, Replace the Fuel Rail Pressure Sensor and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
- Install the component with the specified torques.
- Note that internal damage may occur when the component is dropped or mis- treated.
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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.