Vehicle - Systems Technical Overview
Group00 - GENERAL
Number
03-00-001
Date
09-2003
Model
Accent 2004, ELANTRA 2004, Santa Fe 2004, Sonata 2004, Tiburon 2004 and XG 350 2004
Subject
2004 MODEL TECHNICAL OVERVIEW TECHNICAL CHANGES TO THE 2004 ACCENT AND SONATA
There are no technical changes to the 2004 model year Accent. The only changes are cosmetic.
The only technical change to the Sonata was made in December 2003 MY, when the 2.4L I4 Sonata with the MELCO Engine Management System (EMS) became equipped with a Fuel Temperature Sensor (FTS). The FTS is used for calibration purposes when the EMS runs the Evaporative Emissions Self Check (Leak Test). For more information on the FTS, refer to TSB # 03-36-015.
NOTE
Additional information on the technical changes for 2004 vehicles will be available in the 2004 New Technologies course available in October 2003.
TECHNICAL CHANGES TO THE 2004 ELANTRA
The 2004 Elantra has many new features illustrated and on the following pages.
POWER TRAIN
In 2003 Hyundai introduced the CVVT Beta Engine in the California Emission specification only SULEV Automatic. For 2004, all Elantras will be equipped with the 2.0L CVVT Beta Engine.
(California Emission States are California, New York, Massachusetts, Vermont and Maine.)
NOTE
For more information regarding SULEV, refer to TSB 03-36-014.
The California Emissions equipped 2004 Elantra has the same features as the 2003 SULEV to meet the Federal SULEV and California Partial Zero Emission Vehicle (PZEV) standards (to qualify as a PZEV Vehicle, the vehicle must first be a SULEV vehicle, have a Zero Evaporative Emissions system and 150,000 mile warranty). For 2004, the ULEV Elantra is now equipped with the CVVT engine. The table shown highlights the differences and similarities in the vehicles Engine Management System (EMS) between the SULEV and ULEV designations.
RECOMMENDED ENGINE OIL
API SH grade or above; 5w-30 or 10w-30 ONLY.
TECHNICAL CHANGES - 2004 ELANTRA
INSTRUMENTATION
New Instruments and Trip Computer/Odometer Display
New Trip Computer with Scrolling Button on the Left Side of the Instrument Panel
TECHNICAL CHANGES - 2004 ELANTRA SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
CAUTION
Refer to the appropriate shop manual before performing any diagnostic procedure on any SRS system!
The 2004 Elantra Supplemental Restraint System incorporates the following components:
^ Dual-Stage Driver and Passenger Air Bags.
^ Seat Belt Buckle Switches.
^ Seat Track Position Sensors.
^ Frontal Early Impact Sensor (under core support, just right of the hood latch).
^ Side Air Bags.
^ Satellite Sensors (inside B-Pillars, just above the Seat Belt Pre-Tensioners).
^ Seat Belt Pre-Tensioners.
^ Occupant Classification Sensor.
Passenger Air Bag (PAB)
Dual-Stage air bag that provides two levels of inflation pressures. A first stage pressure level is provided for more severe impacts while a second stage pressure level is provided for more sever impacts. The air bag deployment pressure is determined by the impact speed, seat belt usage and seat position.
Driver Air Bag (DAB)
Dual-Stage air bag that provides two levels of inflation pressures. A first stage pressure level is provided for more severe impacts while a second stage pressure level is provided for more sever impacts. The air bag deployment pressure is determined by the impact speed, seat belt usage and seat position.
Seat Track Position Sensor (STPS)
This sensor relates seat position information to the SRSCM. The sensor is fitted to the seat bottom and a solid metal vane is attached to one of the seat rails. If the seat is positioned up to 8 "clicks" from the most forward location, the vane will be OUTSIDE of the sensor. If the seat is 9 "clicks" or more from the most forward position, the vane will be WITHIN the sensor. The SRSCM uses this information in the Dual-Stage deployment decision.
Seat Belt Buckle Switch
This switch sends seat belt buckle status information to the SRSCM for Air Bag deployment decision processing. If the seat belt buckle is not connected, the Seat Belt Pre-tensioner will not be active.
Satellite Sensor
During a side impact event, this sensor sends a signal to the SRSCM. The SRSCM uses this information to decide whether to deploy the Side Air Bags.
Seat Belt Pre-Tensioner
During a frontal impact, the SRSCM may activate the Seat Belt Pre-Tensioner. This is done to reduce slack in the seat belt, limiting the occupants forward movement during the impact.
Occupation Classification Sensor
The 2004 Elantra SRS system has a Force Sensing Occupation Classification Sensor. This sensor has an array of 56 Force Sensor Resistor (FSR) Cells. The FSR cells resistance decreases with increasing weight. All 56 cells are connected electronically in a module in the front of the seat. When a person sits in the seat, the resistance in each FSR cell (that is carrying part of the load) will decrease relative to the load. When a predetermined number of these cells have been detected to carry a combined load of 56.4 pounds (25.6 kg) or more, the SRSCM sends a signal to activate the PAB circuitry and turn off the Passenger Air Bag off indicator.
Passenger Air Bag Off Indicator
Located in the Center of the Dash Panel, the Passenger Air Off Indicator Lamp provides the occupants with the readiness state of the passenger air bag. If a person sitting in the passenger seat is determined to be too small for the PAB to be active (as determined by the Occupant Classification Sensor), the SRSCM will deactivate the PAB and illuminate the passenger airbag off indicator.
Frontal Impact Sensor (FIS)
This sensor has been added to send a frontal impact signal to the SRSCM to provide the control module with additional information to detect the impact. This additional information allows the control module to make many critical decisions as to Pre-Tensioner and Air Bag deployment.
ABS/FTCS
The new ABS in the 2004 Elantra functions the same as previous model years. The main difference is the adoption of the MGH-20 Hydraulic and Electronic Control Unit (HECU).
1. Smaller HECU physical size.
2. Smaller Solenoid Valves and other interior components.
3. Enhanced reliability with new internal circuitry.
4. Reduced pedal pulsation.
5. Reduced motor noise.
Previous Elantra TCS systems incorporated a braking function only. The new FTCS incorporates both braking and Engine Torque Reduction.
Miscellaneous
2 New Port Installed Radio Options
2004 SANTA FE - OVERVIEW AND TECHNICAL CHANGES
The 2004 Santa Fe is equipped with the following:
^ 2.4L I4 and 2.7L V6 both have a NEW 110 Amp Alternator.
^ 2.7L V6 2WD has Bridgestone Tires as standard equipment.
^ 19 Gallon Fuel Tank (All Models beginning with 1/15/03 Production).
^ 2.4L I4 and 2.7L V6 (2WD) have 10.9 Inch Diameter Ventilated Front Brake Disks.
^ 2.7L V6 (4WD) has 11.65 Inch Diameter Ventilated Front Brake Disks.
^ 11.2 Inch Diameter Solid Rear Brake Disks.
^ Optional Traction Control on 2.7L V6 Mode.
^ Front Skid Plate on 2.7L V6 (4WD).
^ The 2.4L I4 model with the MELCO Engine Management System (EMS) is equipped with a Fuel Temperature Sensor (FTS). The FTS is used for calibration purposes when the EMS runs the Evaporative Emissions Self Check (Leak Test). This change was made in December 2002 for the 2003 MY vehicles. For more information on the FTS, refer to TSB # 03-36-015.
The 2004 3.5L Santa Fe is equipped with the following:
^ 3.5L V6 engine.
^ Electronic Throttle System (ETS)
^ Variable Intake System (VIS).
^ NEW 120 Amp Alternator.
^ 5-speed Shiftronic(TM) automatic transaxle with overdrive and Shift Lock.
^ Standard Traction Control System.
^ Front Skid Plate.
^ Optional On-Demand Electronic 4 wheel drive.
^ Hood Sound Insulation.
^ 11.65 Inch Diameter Ventilated Front Brake Disks.
^ 11.2 Inch Diameter Solid Rear Brake Disks.
^ Homelink Integrated Transceiver (3 channel RF device controller)(LX model).
^ Fuel Temperature Sensor (FTS).
2004 3.5L SANTA FE ELECTRONICALLY CONTROLLED ON-DEMAND 4WD SYSTEM
4WD Inputs and Components
1. Separate 4WD Control Module (4WDCM).
2. Borg-Warner 4WD Coupling Unit (Mounted to front of rear differential).
3. Steering Input Sensor (Located under the steering column, behind the Clock Spring)
4. Front and Rear Wheel Speed Sensors.
5. Throttle Position Sensor.
2004 3.5L SANTA FE 4WD FAULT CODES
Codes are accessed with the Hi-Scan Pro through the DLC by selecting 4WD from the menu.
TECHNICAL CHANGES - 2004 TIBURON
SUSPENSION
All 2004 Tiburons have the same suspension as the 2003 base suspension, including the 2004 GT.
ENGINE
The 4-cylinder 2.0L Beta engine is now equipped with the Continually Variable Valve Timing (CVVT) feature.
In 2003 Hyundai introduced the CVVT Beta Engine in the California Emission Specification Only SULEV Automatic Elantra (California Emission States are California, New York, Massachusetts, Vermont and Maine) For 2004, the base Tiburon will be equipped with the 20L CVVT Beta Engine.
2004 TIBURON 2.0L I4 CVVT EQUIPPED BETA ENGINE
For 2004, the 4-cylinder Tiburon is now equipped with the CVVT engine. The table shown highlights the differences and similarities in the vehicles Engine Management System (EMS) between the 2003 non-CVVT and the 2004 CVVT designations.
The only additions to the valve train of the CVVT 2.0L Beta Engine (as compared to the non-CVVT 2.0L Beta engine) is the CVVT Unit and a cam chain tensioner (see illustration).
The CVVT Unit is installed on the exhaust camshaft and controls the intake valve timing by advancing and retarding the intake cam in relation to the exhaust cam. The degree of advance or retard is controlled by the PCM depending on the engine load.
RECOMMENDED OIL
API SH grade or above; 5w-30 or 10w-30 ONLY.
TECHNICAL CHANGES - 2004 XG 350
HIGH-MOUNT BRAKE LIGHT
The High Mount Brake Light is now an LED type (replacing the previous Bulb Type)
CRUISE CONTROL
The Cruise Control has added Raised Partitions between the Buttons for an improved feel in dark conditions
HOMELINK(TM) INTEGRATED TRANSCEIVER
The 2004 XG 350 is equipped as standard with the HomeLink Integrated Transceiver making it possible to access 3 separate RF controlled devices.
Remote Operation
Previously, the drivers window was accessable with the Unlock Button on the Remote. In 2004 this function has been deleted.
BRAKES
The 2004 XG 350 front brakes have 12.1 inch diameter rotors (previous rotors are 10.9 inch diameter).
SPARE TIRE
The XG 350 is equipped with a full size spare with alloy rim instead of the previous space-saver spare.
ENGINE MANAGEMENT SYSTEM
The XG 350 (with the MELCO Engine Management System) (EMS) is equipped with a Fuel Temperature Sensor (FTS). The FTS is used for calibration purposes when the EMS runs the Evaporative Emissions Self Check (Leak Test). This change was made in December 2002 for 2003 MY vehicles. For more information on the FTS, refer to TSB # 03-36-015.