The Evaporative Control System Is Made up of the Following Components

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SERVICE MANUAL
Applies to: Accent1996-1999, Elantra1996-1999 and Tiburon1997-1999
GROUP
Emissions Control System

P0455 CIRCUIT DESCRIPTION

CODE: / P0455 /
CODE DESCRIPTION: / Evaporative Emissions Control System Incorrect Purge Flow
PRIMARY COMPONENT: / Hoses
SECONDARY COMPONENT: / Purge Control Solenoid Valve
Canister Close Valve
Fuel Tank Pressure Sensor (Differential Pressure Sensor)
SYSTEM(S): / Accent, Elantra, Tiburon (Bosch)
NORMAL PARAMETERS: / Not applicable

The evaporative system reduces hydrocarbon emissions by trapping fuel tank vapors until they can be burned as part of the incoming fuel charge. Evaporating fuel is stored in a charcoal canister until it can be flushed into the intake manifold.

The evaporative control system is made up of the following components:

·  Fuel tank that can be completely sealed from outside air

·  Fuel Tank Pressure Sensor [Differential Pressure Sensor (DPS)]

·  Fuel/vapor separator that only allows vapor to enter the canister

·  Canister Close Valve (CCV) that seals the canister from the outside air

·  Canister filled with activated charcoal granules

·  Purge Control Solenoid Valve (PCSV)

In normal operation, the purge control valve opens and closes, depending on throttle angle and intake manifold vacuum. When it opens, fuel vapors are flushed from the canister and drawn into the intake manifold. To avoid a vacuum build-up in the canister, the canister close valve is normally held open to allow fresh air to replace the vapors drawn into the intake manifold.

FAILURE CONDITIONS

The DPS signal is monitored during a purge cycle during the evaporative emissions self-test, once with the CCV open and once with it closed. If the DPS indicates the pressure does not drop to a specified level or at the expected rate (i.e. takes too long to decrease the DPS voltage) during two back-to-back trips, this code will be set and the Malfunction Indicator Light (MIL) will be turned on.

Details:

This code will be triggered if the following conditions are met:

·  Differential pressure change 2 seconds after evacuation has begun is less than 0.5 hPa (0.04 volts)

OR

·  Rate of pressure change is less than 0.5 hPa/s (0.04 volts/second)

OR

·  Differential pressure after 20 seconds of evacuation is greater than -8 hPa (1.86 volts)

AND

·  Engine is idling

·  Vehicle is not moving

·  Engine coolant temperature at start-up is greater than 19°F (-7°C)

·  Altitude is less than 8,000 ft.

·  Fuel tank pressure is less than 11.9 hPa (2.0 hPa, Accent) at start of test

·  Fuel tank is at least 15% full

·  Engine has been running for at least 16 minutes, 40 seconds

NOTE

Refer to the appropriate Electrical Troubleshooting Manual for full wiring details.

HDS TEST PROCEDURES

1. Connect the HDS to the ECM of the vehicle to be tested using the appropriate connector.

1. Enter the Simu-Tech module of the HDS. Enter the vehicle that is being tested in the Select Vehicle (1)option of the home screen.

1. Select Signal Waveforms (2) from the Simu-Tech home screen.

1. Select CAN CLOS (canister close valve), CAN PURG (canister purge control valve), and DPS (differential pressure sensor) (1) from the list of available signals. These signals must be selected in this sequence to follow the self-check test and capture the complete test trace.

1. Select Analog Record from the Options (2) pull-down menu.

1. Click the CTRL (1) button and select MS/DIV. Set the resolution to 300.00 MS/DIV (2) and click OK (3). By using this low resolution, the recording window is larger (112.13 seconds). The entire duration of the EVAP system self-check can then be recorded.

7.  Click the Run (4) button to start recording. With the engine running, trigger the EVAP system self-check using the hand-held scanner (follow the prompts on the scan tool). After the self-check is complete, click the HDS mouse button again to stop recording.

1. There are several controls for viewing the recorded signal. Scroll moves the signal horizontally either forward or backward. Zoom enlarges or shrinks the signal. CTRL (Control) changes viewing options such as speed, digital or analog, and signal overlays. Refer to the Hyundai Diagnostic System User's Guide for complete details about the viewing controls.

1. To view the total self-check waveform, select a zoom factor of -32. The example shown is a normal EVAP system self-check. Several aspects of the EVAP system are tested for integrity during this test. Refer to the HDS Signal Waveform Reference Manual for a complete breakdown of the self-check signals. This manual also has some examples of various problems and their related signals.

1. Here is one example of a problem in the EVAP system that can be identified during the self-check. The EVAP system can be checked for a small leak by closing the system off from the outside air, creating a vacuum, and monitoring if the system can hold that vacuum sufficiently for a set amount of time. If it cannot, a leak exists in the system somewhere. In this example, the CAN CLOS is closed (zero volts), the CAN PURG is operating (activity in signal), and the DPS is indicating a drop in pressure. Once the CAN PURG stops operating, the DPS shows an increase in pressure, even though the CAN CLOS is still closed. This indicates a small leak somewhere in the system.

SCAN TOOL / DVOM TEST PROCEDURE

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http://www.hmaservice.com/index.jsp?SSOSESSIONID=WC41fsCgrcGA823INKGgUzQ4

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SERVICE MANUAL
Applies to: Tiburon2003
GROUP
Fuel System / Troubleshooting (SIEMENS EMS)
DTC / Diagnostic item /
P0442
P0455
P0456 / EVAP Emission Control System Small leak (1mm)
EVAP Emission Control System Large Leak Detected
EVAP Emission Control System Small Leak Detected (0.5 mm)

NOTE

·  If DTC P0455 is stored and MIL is illuminated, before proceeding to evaporative system test and repair, verify whether the customer was running the engine during refueling.

·  If an obvious cause for DTC P0455 is an engine running during refueling, erase the DTC P0455 using Hi-Scan and do not repair the evaporative system. However, the vehicle should be monitored to find reoccurrence of the concern which may come from actual evaporative system.

TEST PROCEDURE

See the YES box directly above regarding air and CCV.

See the Yes box directly below regarding “Mityvac or similar tool” and the “T” for applying pressure to the system.

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What to See in Hyundai Service Manual for the 2003 Tiburon

To find where some of the Excel information was found, please see the note section at the top, the top box under Test Procedure, the first two yes boxes, the fourth yes box, the fourth no box, the sixth yes box and the first yes box on the right.

This was found at

http://www.hmaservice.com/index.jsp

SERVICE MANUAL
Applies to: Tiburon2004
GROUP
Fuel System / Troubleshooting
DTC / P0455 / EVAP Emission Control System - Large Leak

DESCRIPTION

Due to the increasing ambient temperature of the fuel and the return of unused hot fuel from the engine, fuel vapors are generated in the tank. In order to control the release of these vapors to the atmosphere, the evaporative emissions control system is used. The evaporative emmissions system reduces hydrocarbon (HC) emissions by trapping fuel tank vapors until they can be burned in the combustion process. Evaporating fuel is stored in a charcoal canister until it can be flushed into the intake manifold. The evaporative control system is made up of a fuel tank that can be completely sealed from outside air, a Fuel Tank Pressure Sensor (FTPS), a fuel/vapor separator (FLS) that only allows vapor to enter the canister, a Canister Close Valve (CCV) that seals the canister from the outside air, a canister filled with activated charcoal granules, and a Purge Control Solenoid Valve (PCSV). The evaporative system can be checked for leaks by closing the system off from the outside air, creating a vacuum, and monitoring if the system can hold that vacuum sufficiently for a set amount of time. If it cannot, a leak exists somewhere in the system.

DTC DETECTING CONDITION

DTC No / Detecting Condition amp; Limp Home / Suspected area /
P0455 / Detecting Condition
·  Large leakage occurred during evacuation diagnosis.
·  Enable Condition
- Engine coolant temperature > 74°C (166°F)
- Minimum modeled ambient temperature > -10°C (14°F)
- Estimated altitude < 2440m( 8000 ft )
- Vehicle speed < 9.6 km/h( 6 mph )
- Idle state
- Differential fuel tank pressure: –6 ~ 3mmHg
- Minimum purge time: 5 ~ 25 sec
- Time after start: 590 sec
- 11V < Battery voltage < 16V
Limp Home
·  None / - EVAP system
- ECM

SCHEMATIC DIAGRAM

Refer to DTC P0442

INSPECTION PROCEDURES

Proceed with ECM problem procedure.

What to See in Hyundai Service Manual for the 2004 Tiburon

Please note that there is a lot of repeated material here; however, please note the addition of the first step and its related yes and no boxes.

This was found at http://www.hmaservice.com/index.jsp .

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8/8/2006