DTC P0455 (LUJ)
Diagnostic Instructions
DTC Descriptor
DTC P0455 00: Evaporative Emission (EVAP)
System Large Leak Detected |
Circuit/System Description
The engine control module (ECM) tests the evaporative emission
(EVAP) system for a large leak. The ECM monitors the fuel tank
pressure sensor signal to determine the EVAP system vacuum level.
When the conditions for running are met, the ECM commands the EVAP
canister purge solenoid valve open and the EVAP canister vent
solenoid valve closed. This allows engine vacuum to enter the EVAP
system. At a calibrated time, or vacuum level, the ECM commands the
EVAP canister purge solenoid closed, sealing the system, and
monitors the fuel tank pressure sensor input in order to determine
the EVAP system vacuum level. The following table illustrates the
relationship between the ON and OFF states, and the open or closed
states of the EVAP canister purge solenoid and EVAP canister vent
solenoid valves.
Control Module Command
|
EVAP Canister Purge Solenoid Valve
|
EVAP Canister Vent Solenoid Valve
|
On
|
Open
|
Closed/Not Venting
|
Off
|
Closed
|
Open/Venting
|
|
|
Conditions for Running the DTC
• |
DTCs P000A 00, P000B 00, P0010
00, P0013 00, P0016 00, P0017 00, P0030 00, P0031 00, P0032 00,
P0111 00, P0112 00, P0113 00, P0114 00, P0117 00, P0118 00, P0119
00, P0121 00, P0122 00, P0123 00, P0130 00, P013 001, P0132 00,
P0133 00, P0134 00, P0135 00, P0171 00, P0172 00, P0201 00, P0202
00, P0203 00, P0204 00, P0221 00, P0222 00, P0223 00, P0261 00,
P0262 00, P0264 00, P0265 00, P0267 00, P0268 00, P0270 00, P0271
00, P0300 00, P0301 00, P0302 00, P0303 00, P0304 00, P0335 00,
P0336 00, P0340 00, P0341 00, P0365 00, P0366 00, P0436 00, P0442
00, P0443 00, P0446 00, P0449 00, P0451 00, P0452 00, P0453 00,
P0454 00, P0456 00, P0458 00, P0459 00, P0496 00, P0498 00, P0499
00, P0500 00, P0506 00, P050 007, P0562 00, P0563 00, P0601 00,
P0602 00, P0604 00, P0606 00, P0607 00, P061A 00, P0642 00, P0643
00, P2088 00, P2089 00, P2090 00, P2091 00, P2100 00, P2101 00,
P2119 00, P2176 00, P2297 00, P2301 00, P2304 00, P2307 00, P2310
00, P2610 00, and P2A00 00 are not set. |
• |
The ignition voltage is
between 10-18 V. |
• |
The barometric pressure (BARO)
is more than 75 kPa (11 PSI). |
• |
The engine coolant temperature
(ECT) sensor is less than 110°C (230°F). |
• |
The fuel level is between 6-40
L (2-10 gal). |
• |
The vehicle speed is 0 km/h (0
MPH). |
• |
The intake air temperature
(IAT) sensor is between -8 to +70°C (+17 to +158°F).
|
• |
The engine is operating in
closed loop fuel control. |
• |
DTC P0455 00 runs once per
cold start within 10 min of start-up. |
Conditions for Setting the DTC
The EVAP system is not able to achieve or maintain vacuum before
purge has reached a calibrated volume.
Action Taken When the DTC Sets
DTC P0455 00 is a Type B DTC.
Conditions for Clearing the DTC
DTC P0455 00 is a Type B DTC.
Diagnostic Aids
• |
A loose, missing, incorrect,
or damaged fuel fill cap may cause this DTC to set. |
• |
To help locate intermittent
leaks, use the EN 41413-200 Evaporative Emissions
System Tester (EEST) to introduce smoke into the EVAP system. Move
all EVAP components while observing smoke with a high intensity
white light. Introducing smoke in 15 s intervals will allow less
pressure into the EVAP system. When the system is less pressurized,
the smoke will sometimes escape in a more condensed manner.
|
• |
To improve the visibility of
the smoke exiting the EVAP system, observe the suspected leak area
from different angles with a high intensity white light.
|
Reference Information
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Evaporative Emission Control System Description
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Special Tools
EN 41413-200 Evaporative Emissions System Tester
(EEST)
CH 48096 EVAP Service Access Port Tool
GE 41415-50 Fuel Tank Cap Adapter
EN 41413-300 EVAP Cap And Plug Kit
EN 41413-VLV EVAP Service Port Vent Fitting
For equivalent regional tools, refer to
Special Tools .
Circuit/System Testing
Note:
• |
Larger volume fuel
tanks and/or those with lower fuel levels may require several
minutes for the floating indicator to stabilize. |
• |
Refer to the
EN 41413-200 Evaporative Emissions System Tester
(EEST) operation manual for detailed instructions, see
Alcohol/Contaminants in Fuel Diagnosis. |
1. |
Connect the EN
41413-200 Evaporative Emissions System Tester (EEST)
nitrogen/smoke hose to the EVAP Plug brass cone adaptor.
|
2. |
Disconnect the hose at the
fuel cap end of the GE 41415-50 Fuel Tank Cap
Adaptor . Connect the EVAP Plug to the disconnected hose on the
GE 41415-50 Fuel Tank Cap Adaptor . |
3. |
Install the GE
41415-50 Fuel Tank Cap Adaptor filler neck end only to
the vehicle. |
4. |
Disconnect the harness
connector at the Q13 Evaporative Emission Vent Solenoid
Valve. |
5. |
Use jumper wires to close the
Q13 Evaporative Emission Vent Solenoid Valve. |
6. |
Use the flow meter on the
EN 41413-200 Evaporative Emissions System Tester
(EEST) , calibrated to 0.51 mm (0.020 in) to determine that there
is no leak in the EVAP system. |
⇒ |
If a leak is detected, use the EN
41413-200 Evaporative Emissions System Tester (EEST) to
apply smoke to the EVAP system at the purge tube or the filler neck
until the leak is located. |
7. |
Use the hand vacuum pump at
the purge tube to create a vacuum on the EVAP system. |
8. |
Engine running, the
vacuum/pressure gauge on the EN 41413-200
Evaporative Emissions System Tester (EEST) and the scan tool Fuel
Tank Pressure Sensor parameter should both show vacuum.
|
⇒ |
If the vacuum/pressure gauge shows vacuum but the
scan tool Fuel Tank Pressure Sensor parameter does not show vacuum,
replace the B150 Fuel Tank Pressure Sensor. |
⇒ |
If neither the scan tool Fuel Tank Pressure Sensor
parameter or the vacuum/pressure gauge shows vacuum, repair the
restriction in the purge path. |
9. |
Verify that the vacuum
increases to -2 kPa (0.3 PSI), 3.0 V, and the value is similar
between the scan tool and the vacuum/pressure gauge on the EN
41413-200 Evaporative Emissions System Tester (EEST)
. |
⇒ |
If the values are not similar or the voltage did
not reach -2 kPa (0.3 PSI), 3.0 V, replace the B150 Fuel Tank
Pressure Sensor. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
Control Module References for ECM replacement, setup and
programming
|