Engine Controls - MIL ON/DTC's P0442/P0455 Set
No.: LA-303-002Issue: 1
DATE: May 05, 2006
Section: 303-08
Evaporative Loss System DTC P0442, P0455
AFFECTED VEHICLE RANGE:
Land Rover LR3 (LA) VIN: 5A000360 to 6A387097
CONDITION SUMMARY:
MIL ILLUMINATION
Situation:
A customer may report a concern that the Check Engine lamp has illuminated. Investigation using the Worldwide Diagnostic System (WDS) reveals diagnostic trouble codes (DTCs) P0455 (evaporative loss gross leak detected) or P0442 (evaporative loss small leak detected).
The most likely cause of the above lamp display is an incorrectly installed or missing fuel filler cap.
Action:
Should a customer express concern regarding the above, refer to the Service Procedure detailed in this bulletin to update the engine control module software to the latest configuration.
On vehicles built after 6A387097 and on updated vehicles a message 'Fuel Tank Cap Loose or Missing' will display at the first loose cap event prompting the owner to check the gas cap. When the cap is properly installed shortly after the message is displayed the engine warning lamp will not illuminate because the on-board diagnostics require two consecutive occurrences to illuminate the lamp. If the customer has not taken the opportunity to install the filler cap correctly a second sequential event will prompt the Check Engine lamp illumination with the corresponding trouble codes.
TOOLS:
WDS CD13 with Patch File 2 or later
WARRANTY
REPAIR PROCEDURE
DOWN LOAD LATEST GENERATION SOFTWARE
NOTE:
The on-board diagnostics require two consecutive occurrences of a detected evaporative loss system leak to illuminate the Check Engine lamp (the first detection being stored in memory).
^ When illuminated, a service visit is required to use T4/WDS to verify the leak and extinguish the lamp.
^ In most cases, the leak is traced to an incorrectly installed filler cap.
^ The message "Fuel Tank Cap Loose or Missing" is a new message, displayed on the first leak detection (instead of the detection being assigned to memory only) and is a prompt for the customer to ensure correct filler cap installation and reduce the number of second leak detection incidents.
^ The new software does not affect the on-board diagnostic (OBD) requirements.
CAUTION:
If an incorrectly installed filler cap was not the cause of the leak, further diagnosis should be completed to rectify the cause of the leak before the software is updated.
1. Check the vehicle for the cause of the leak and rectify as required.
2. When the leak is corrected (including ensuring a properly installed filler cap), perform the new software installation.
3. If WDS has previously had the patch file (WDS CD13 - Patch File 2) installed, continue from step 7. For information on how to confirm that the patch file has been installed onto WDS, refer to the patch process help file detailed in step 4.
NOTE:
The software patch installation help file provides instructions for the patch file installation process and could take up to six minutes to download dependent on connection speed.
NOTE:
GTR lookup sequence is as follows:
GTR Home> NAS> Diagnostics/LA - LR312006> Patch Files > "Patch Process Help File" link
4. If not previously installed, download the WDS software patch installation help file from GTR:
^ Log on to GTR.
^ Select 'Home' from the menu at the top of the main page.
^ From the menus on the left of the page, select 'Diagnostics' as the 'Information Type' and select the relevant model and model year.
^ From the 'All Information' results, select 'Patch Files'.
Click the file link 'Patch Process Help File'.
NOTE:
It could take up to twenty minutes to download the patch file, depending on connection speed.
5. If 'WDS CD13 - Patch File 2' as not been previously installed, download and install the software patch file into WDS using the help file as a guide
6. Verify that WDS successfully restarts.
NOTE:
Midronics battery charger PSC550 must be connected to the vehicle battery during diagnosis/module configuration.
7. Connect the diagnostic equipment to the vehicle and begin a WDS session.
8. Note the current software levels of the engine control module as follows:
^ Enter the vehicle details.
^ Select the 'Vehicle Configuration' tab.
^ Select 'Module Information'
^ Select 'Network integrity test'
^ Record the software part numbers displayed on the screen.
NOTE:
During module configuration, the on-screen software part number information that WDS will displays during this step should be compared to the software part number noted in step 8 above.
9. Compare the tune level displayed to the recorded value in step 8.
10. If the observed and recorded values are the same, the vehicle already has the desired software level and the tune download process can be aborted.
11. If the observed and recorded values are different, configure the control module as follows:
^ Return to the 'Vehicle Configuration' screen and select 'Module Configuration'
^ Select 'Configure Existing Modules'.
^ From the sub-menu, select 'Engine Control Module'
^ Check the tick-box to continue and follow the on-screen instructions.
12. Repeat step 8 to confirm the software level change.
13. Exit the WDS session and disconnect the diagnostic equipment from the vehicle.
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