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.
2004 Hyundai Accent BaseFACTORY OEM SERVICE PROCEDURE
Engine Control System Diagnosis (2 Of 2)
- DTC Troubleshooting Procedures
- Notes
- Inspection Chart For Diagnostic Trouble Code
- DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1)
- DTC P0441: EVAP Emission Control System-Incorrect Purge Flow
- DTC P0442: EVAP Emission Control System Small Leak (1 Mm)
- DTC P0444: EVAP. Emission CTRL. System-Purge CTRL. Valve Circuit Open
- DTC P0445: EVAP. Emission System-Purge CTRL. Valve Circuit Shorted
- DTC P0461: Fuel Level Sensor Circuit Range/Performance
- DTC P0462: Fuel Level Sensor Low Input
- DTC P0463: Fuel Level Sensor High Input
- DTC P0501: Vehicle Speed Sensor Range/Performance
- DTC P0502: Vehicle Speed Sensor "A" Circuit Low Input
- DTC P0503 Vehicle Speed Sensor - High Input
- DTC P0506: Idle Control System - Rpm Lower Than Expected
- DTC P0507: Idle Control System - Rpm Higher Than Expected
- DTC P0562: System Voltage Low
- DTC P0563: System Voltage High
- DTC P0605: Internal Control Module Read Only Memory (ROM) Error
- DTC P0630: VIN Not Programmed Or VIN Compatible
- DTC P0645: A/C Clutch Relay Control Circuit
- DTC P1307: Acceleration Sensor Malfunction
- DTC P1308: Acceleration Sensor Circuit Low Input
- DTC P1309: Acceleration Sensor Signal Check High
- DTC P1505: Idle Charge Actuator Signal Low Of Coil #1
- DTC P1506: Idle Charge Actuator Signal High Of Coil #1
- DTC P1507: Idle Charge Actuator Signal Of Low Coil #2
- DTC P1508: Idle Charge Actuator Signal High Of Coil #2
- DTC P1624: Cooling Fan Relay Circuit Malfunction (Low)
- DTC P1625: Cooling Fan Relay Circuit Malfunction (High)
- DTC P1765: Torque Reduction Signal - Malfunction
- DTC P2096: Post Catalyst Fuel Trim System Too Lean (Bank 1)
- DTC P2097: Post Catalyst Fuel Trim System Too Rich (Bank 1)
- DTC P2187: Fuel Trim Malfunction - System Too Lean At Idle (Additive)
- DTC P2188: System Too Rich At Idle (Bank 1)
- DTC P2191: System Too Lean At Higher Load (Multiple) (Bank 1)
- DTC P2192: System Too Rich At Higher Load (Bank 1)
- DTC P2400: Evaporative Emission System Leak Detection Pump Control Circuit/Open
- DTC P2401 Evaporative Emission System Leak Detection Pump Control Circuit Low
- DTC P2402 Evaporative Emission System Leak Detection Pump Control Circuit High
- DTC P2404: Evaporative Emission System Leak Detection Pump Sensor Circuit Range/Performance
- DTC P2405: Evaporative Emission System Leak Detection Pump Sensor Circuit Low
- DTC P2406 Evaporative Emission System Leak Detection Pump Sensor Circuit High
- DTC P2407: Evaporative Emission System Leak Detection Pump Sensor Circuit Intermittent/Erratic
- DTC P2418: Evaporative Emission System Switching Valve Control Circuit/Open
- DTC P2419: Evaporative Emission System Switching Valve Control Circuit Low
- DTC P2420: Evaporative Emission System Switching Valve Control Circuit High
Factory Service Tools
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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.
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