DTC P0442 (LUJ)
Diagnostic Instructions
DTC Descriptor
| DTC P0442 00: Evaporative Emission (EVAP)
System Small Leak Detected |
Circuit/System Description
This DTC tests the evaporative emission (EVAP) system for a
small leak. The engine control module (ECM) monitors the fuel tank
pressure sensor signal to determine the vacuum decay rate. At an
appropriate time, the ECM turns the EVAP canister purge solenoid
valve ON and the EVAP vent solenoid valve ON. This allows the
engine to draw a vacuum on the EVAP system. At a calibrated time,
or vacuum level, the ECM turns the EVAP canister purge solenoid
valve OFF, sealing the system, and monitors the fuel tank pressure
sensor input in order to determine the EVAP system vacuum decay. If
the ECM detects a leak larger than a calibrated amount, these DTCs
will set.
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, P0131 00, 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, P0442 00, P0443 00, P0446
00, P0451 00, P0452 00, P0453 00, P0454 00, P0455 00, P0456 00,
P0458 00, P0459 00, P0496 00, P0498 00, P0499 00, P0501 00, P0506
00, P0507 00, 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 barometric pressure (BARO)
is more than 75 kPa (11 PSI). |
| • |
The engine has been running
between 1-10 min. |
| • |
The fuel level is between 6-40
L (2-10 gal). |
| • |
The fuel tank pressure is
between -3 to +1 kPa (-0.4 to +0.1 PSI). |
| • |
The vehicle speed is 0 km/h (0
MPH). |
| • |
The intake air temperature
(IAT) is between -8 to +70°C (+17 to +158°F). |
| • |
The battery voltage is more
than 10 V. |
| • |
The engine is operating in
closed loop fuel control. |
| • |
DTC P0442 00 runs once per
drive cycle when the above conditions have been met. |
Conditions for Setting the DTC
DTC P0442 00 sets when a leak greater than 0.85 mm (0.033 in) is
detected.
Action Taken When the DTC Sets
DTCs P0442 00 is a Type B DTC.
Conditions for Clearing the DTC
DTCs P0442 00 is a Type B DTC.
Diagnostic Aids
| • |
The EVAP system can be filled
with smoke more quickly and completely by opening the system
opposite the end where the smoke is injected. For example, when
injecting smoke at the purge tube, remove the filler cap or
temporarily leave the vent open until smoke is observed. Close the
system and continue testing. If using a fuel cap adapter at the
filler neck, disconnect the purge tube at the EVAP canister purge
solenoid valve until smoke is observed. |
| • |
To help locate intermittent
leaks, use the EN 41413-200 Emissions System Tester
(EEST) to introduce smoke into the EVAP system. Move all EVAP
components while observing smoke with a high intensity white
light. |
| • |
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.
|
| • |
If a small leak is difficult
to find, it may be necessary to remove the EVAP components and test
them one at a time using the adaptors in the EN 41413-300
EVAP Cap And Plug Kit . |
Reference Information
Schematic Reference
Engine Controls Schematics
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
CH 48096 EVAP Service Access Port Tool
EN 41413-300 EVAP Cap And Plug Kit
EN 41413-200 Emissions System Tester (EEST)
EN 41413-SPT High Intensity White Light
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. |
| • |
Ensure that the
vehicle underbody temperature is similar to the ambient temperature
and allow the surrounding air to stabilize before starting the
diagnostic procedure. The system flow will be less with higher
temperatures. |
| • |
Refer to the
EN 41413-200 Emissions System Tester (EEST)
operation manual for detailed instructions |
|
| 1. |
Connect the EN
41413-200 Emissions System Tester (EEST) to the vehicle
at the EVAP service port. For vehicles without a service port,
disconnect the purge tube at the quick connector on the EVAP
canister side of the Q12 Evaporative Emission Purge Solenoid Valve
and install the CH 48096 EVAP Service Access Port
Tool . |
| 2. |
Using a scan tool, close the
Q13 Evaporative Emission Vent Solenoid Valve to seal the EVAP
system. |
| 3. |
Use the flow meter on the
EN 41413-200 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 Emissions System Tester (EEST) to apply smoke
to the EVAP system at the service port or the purge tube until the
leak is located using the EN 41413-SPT High
Intensity White Light . |
Repair Instructions
| 1. |
Seal the EVAP system and use
the flow meter on the EN 41413-200 Emissions System
Tester (EEST) , calibrated to 0.51 mm (0.020 in) to determine that
there is no leak in the EVAP system. |
|
