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 Elantra GLS, AutomaticFACTORY OEM SERVICE PROCEDURE
Fuel System
- General
- MFI Control System
- Fuel Delivery System
- DTC Trouble Shooting Procedures
- DTC Index
- DTC: P0010 "A" Camshaft Position Actuator Circuit Malfunction
- DTC P0030: O2 Sensor Heater - Heater Control Circuit (Bank 1, Sensor 1)
- DTC P0031: O2 Sensor Heater Circuit Low Input (Bank 1, Sensor 1)
- DTC P0032: O2 Sensor Heater Circuit High Input (Bank 1, Sensor 1)
- DTC P0036: O2 Sensor Heater - Heater Control Circuit (Bank 1, Sensor 2)
- DTC P0037: O2 Sensor Heater Circuit Low Input (Bank 1, Sensor 2)
- DTC P0038: O2 Sensor Heater Circuit High Input (Bank 1, Sensor 2)
- DTC P0076: Intake Valve Control Solenoid Circuit Low - Oil-Flow Control Valve (OCV)
- DTC P0077: Intake Valve Control Solenoid Circuit High - Oil-Flow Control Valve (OCV)
- DTC P0101: Mass Air Flow Sensor (MAFS) Range/Performance Problem
- DTC P0102: Mass Air Flow Circuit Low Input
- DTC P0103: Mass Air Flow Circuit High Input
- DTC P0112: Intake Air Temperature Sensor (IATS) Circuit Low Input
- DTC P0113: Intake Air Temperature Sensor (IATS) Circuit High Input
- DTC P0116: Engine Coolant Temperature Sensor (ECTS) Circuit Range/Performance Problem
- DTC P0117: Engine Coolant Temperature Sensor (ECTS) Circuit Low Input
- DTC P0118: Engine Coolant Temperature Sensor (ECTS) Circuit High Input
- DTC P0119: Engine Coolant Temperature Sensor Circuit Intermittent
- DTC P0121: Throttle Position Sensor (TPS) Circuit Range/Performance Problem
- DTC P0122: Throttle Position Sensor (TPS) Circuit Low Input
- DTC P0123: Throttle Position Sensor Circuit High Input
- DTC P0125: Insufficient Coolant Temperature For Closed Loop Fuel Control
- DTC P0128: Coolant Thermostat Malfunction
- DTC P0131: O2 Sensor Circuit Low Input (Bank 1, Sensor 1)
- DTC P0132: O2 Sensor Circuit High Input (Bank 1, Sensor 1)
- DTC P0133: O2 Sensor Circuit Slow Responsive (Bank 1, Sensor 1)
- DTC P0136: O2 Sensor Circuit Open Check (Bank 1, Sensor 2)
- DTC P0137: O2 Sensor Circuit Low Input (Bank 1, Sensor 2)
- DTC P0138: O2 Sensor Circuit High Input (Bank 1, Sensor 2)
- DTC P0139: O2 Sensor Circuit Slow Responsive (Bank 1, Sensor 2)
- DTC P0140: O2 Sensor Circuit No Activity Detected (Bank 1, Sensor 2)
- DTC P0171: Fuel Trim Malfunction - System Too Lean (Upstream)
- DTC P0172: Fuel Trim Malfunction - System Too Rich (Upstream)
- DTC P0196: Engine Oil Temperature Sensor (OTS) Circuit Range/Performance
- DTC P0197: Engine Oil Temperature Sensor Circuit Low Input
- DTC P0198: Engine Oil Temperature Sensor Circuit High Input
- DTC P0230: Fuel Pump Circuit Malfunction
- DTC P0261: Cylinder 1 - Injector Circuit Low Input
- DTC P0262: Cylinder 1 - Injector Circuit High Input
- DTC P0264: Cylinder 2 - Injector Circuit Low Input
- DTC P0265 Cylinder 2 - Injector Circuit High Input
- DTC P0267: Cylinder 3 - Injector Circuit Low Input
- DTC P0268: Cylinder 3 - Injector Circuit High Input
- DTC P0270: Cylinder 4 - Injector Circuit Low Input
- DTC P0271: Cylinder 4 - Injector Circuit High Input
- DTC P0300: Multiple Cylinder Misfire Detected
- DTC P0301: Cylinder 1 - Misfire Detected
- DTC P0302: Cylinder 2 - Misfire Detected
- DTC P0303: Cylinder 3 - Misfire Detected
- DTC P0304: Cylinder 4 - Misfire Detected
- DTC P0325: Knock Sensor (KS) Circuit Malfunction
- DTC P0335: Crankshaft Position Sensor (CKPS) Circuit Malfunction
- DTC P0340: Camshaft Position Sensor (CMPS) Circuit Malfunction
- DTC P0341: Camshaft Position Sensor (CMPS) Circuit Range/Performance
- DTC P0420: Main Catalyst Efficiency Below Threshold (Bank 1)
- DTC P0441: EVAP Emission Control System - Incorrect Purge Flow
- DTC P0442: EVAP Emission Control System - Small Leak Detected (1.0 Mm)
- DTC P0444: EVAP Emission Control System Purge Control Solenoid Valve (PCSV) Circuit Open
- DTC P0445: EVAP Emission Control System Purge Control Solenoid Valve (PCSV) Circuit Shorted
- DTC P0447: EVAP Emission Control System Vent Circuit Open
- DTC P0448: EVAP Emission Control System Vent Circuit Shorted
- DTC P0449: EVAP Emission Control System Vent Valve/Solenoid Circuit
- DTC P0451: EVAP Emission Control System Pressure Sensor Range/Performance Problem
- DTC P0452: EVAP Emission Control System Pressure Sensor Low Input
- DTC P0453: EVAP Emission Control System Pressure Sensor High Input
- DTC PO454: EVAP Emission Control System Pressure Sensor Intermittent
- DTC P0455: EVAP Emission Control System - Large Leak
- DTC P0456: EVAP Emission Control System - Small Leak Detected (0.5 Mm)
- DTC P0501: Vehicle Speed Sensor Range/ Performance
- DTC P0506: Idle Control System - Rpm Lower Than Expected
- DTC P0507: Idle Control System - Rpm Higher Than Expected
- Description
- DTC Detecting Condition
- Specifications
- Schematic Diagram
- Signal Waveform
- Inspection Procedures
- 1. Check DTC Relating To TPS, MAFS, INJECTOR, PCSV, Or ISCA
- 2. Check Free Play Of Accelerator Cable
- 3. Check TPS Signal
- 4. Visually Check ISCA For Connector Condition
- 5. Check ISCA Resistance
- 6. Check ISCA For Normal Operation
- 7. Check Vacuum Hose & PCV
- 8. Check PCSV For Normal Operation
- 9. Check Gaskets, Seals, & Valve For Cracks Or Leaks
- DTC P0560: System Voltage Malfunction
- DTC P0562: System Voltage Low Input
- DTC P0563: System Voltage High Input
- DTC P0600: Serial Communication Link
- DTC P0605: Internal Control Module Read Only Memory (ROM)
- DTC P0606: ECM Processor (Ecu Self Test Failed)
- DTC P0650: Malfunction Indicator Lamp (Mil) Control Circuit Malfunction
- DTC P1166: O2 Sensor System Lambda Bank Controller At The Limit (Bank 1)
- Description
- DTC Detecting Condition
- Inspection Procedures
- 1. Check DTC Relating To HO2S, Fuel System, EVAP System, Or Ignition System
- 2. Check Air Leakage & Connections To Dynamic Chamber
- 3. Check PCSV
- 4. Check Fuel Line Pressure
- 5. Check Injector For Normal Operation
- 6. Check Spark Plugs For Normal Operation
- 7. Check Front HO2S
- 8. Check ECM Input Signals Relating To MAFS, TPS, & ECTS
- DTC P1372: Segment Time Acquisition Incorrect
- DTC P1502: Open Wire Magnetic Wheel Sensor Malfunction
- DTC P1505: Idle Speed Control Actuator (ISCA) Signal Low Of Coil #1
- DTC P1506: Idle Speed Control Actuator (ISCA) Signal High Of Coil #1
- DTC P1507: Idle Speed Control Actuator (ISCA) Signal Low Of Coil #2
- DTC P1508: Idle Speed Control Actuator (ISCA) Signal High Of Coil #2
- DTC P1529: TCM Request For Mil On
- DTC P1602: Serial Communication Problem With TCM (Time Out)
- DTC P1690, P1691, P1693, P1694, P1695 & P1696: Immobilizer Malfunction
- DTC P2096 & P2097: Fuel Trim Malfunction
- DTC P2195 & P2196: O2 Sensor Signal Stuck
- DTC P2231: O2 Sensor Signal Circuit Shorted To Heater Circuit (Bank 1, Sensor 1)
- DTC P2237, P2243, P2251 & P2626: Linear O2 Sensor Circuit Open (Bank 1, Sensor 1)
- DTC P2270 & P2271: O2 Sensor Signal Stuck (Bank 1, Sensor 2)
- DTC P2414: O2 Sensor Exhaust Sample Error (Bank 1, Sensor 1)
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.