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HOMESERVICE MANUALSHYUNDAI2003ACCENT GL, 2D HATCHBACK, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMSELF-DIAGNOSTICSDIAGNOSTIC TESTSDTC P0301, DTC P0302, DTC P0303 & DTC P0304FAILURE CONDITIONS (P0301-P0304)
2003 Hyundai Accent GL, 2D Hatchback, Standard

Failure Conditions (P0301-P0304)

2003 Hyundai Accent GL, 2D Hatchback, StandardSECTION Failure Conditions (P0301-P0304)

ECM will set DTC P0301, P0302, P0303, or P0304 and illuminate the MIL if 2 misfires per 100 engine revolutions are detected during 2 drive cycles. The misfire rate is measured every 200 revolutions when the following conditions are met:

  • Speed change is less than 1000 RPM per second.
  • Engine speed is 600-4000 RPM.
  • Engine load is greater than 2.0 milliseconds.
  • No fuel cut-off exists.
  • Starter is not engaged.
  • Vehicle is on smooth road (acceleration sensor reports less than 0.3 g acceleration).
When misfire rate increases to 5-25 percent per 200 revolutions, there is a danger of catalytic converter damage and MIL will blink on and off. Catalytic converter temperature could exceed 3542°F (1950°C) if misfire rate increases sufficiently. This DTC indicates a problem with a specific cylinder ignition being detected by ECM.

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.