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: Specifications
General Specification Table
| Items | Specifications |
|---|---|
| Engine Management System (ECM) | Siemens |
| Fuel tank | |
| Capacity | 55 lit. (14.5 U.S. gal., 12.1 lmp.gal.) |
| Return system | Returnless |
| Fuel filter | High pressure type (built in F/Pump Assembly) |
| F/Pressure regulator | Built in F/Pump Assembly |
| Regulator pressure | 350 kpa (3.5 kg/cm2 , 49.8 psi) |
| Fuel pump | Electrical, in-tank type |
| INPUT SENSORS | |
| Mass Air Flow (MAF) sensor | Hot film type |
| Output voltage | 0 ~ 5V |
| Throttle body | |
| Throttle Position Sensor (TPS) | Variable resister type |
| Resistance | 0.7 ~ 3.0 kΩ |
| Output voltage at curb idle | 0.1 ~ 0.875V |
| Knock sensor | Piezoelectric type |
| Intake Air Temperature sensor (IAT Sensor) | Thermistor type (built in MAF sensor) |
| Resistance | 2.0 ~ 3.0 kΩ at 20°C (68°F) |
| Engine Coolant Temperature sensor (ECT Sensor) | Thermistor type |
| Resistance | 2.27 ~ 2.73kΩ at 20°C (68°F) 0.30 ~ 0.32kΩ at 80°C (176°F) |
| Heated Oxygen Sensor (HO2S) | Zirconia sensor (Heated) |
| Output voltage (V) | 0 ~ 1V |
| Heated Oxygen Sensor (HO2S) for SULEV | Linear Oxygen Sensor |
| Vehicle Speed Sensor | Wheel speed sensor (Inductive) |
| Camshaft Position Sensor (CMP Sensor) | Hall effect sensor |
| Output voltage (V) | 0 ~ 5V |
| Crankshaft Position Sensor (CKP Sensor) | Hall effect sensor |
| Output voltage (V) | 0 ~ 5V |
| Differential Pressure Sensor (DPS) | Piezo-Resistivity type |
| OUTPUT ACTUATORS | |
| Injector type | Electromagnetic type |
| Number | 4 |
| Coil resistance (Ω) | 14.5 ± 0.7Ω |
| EVAP Canister Purge solenoid valve | Duty type |
| Resistance | 26Ω |
| Idle Speed Control actuator (ISC Actuator) | Double coil type |
| Control frequency (Hz) | 100Hz |
| Canister Close Valve (CCV) | ON/OFF type |
Factory Service Tools
Use the Manual With the Right Hardware
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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.