Focus L4-2.0L (2009)
Canister Vent Valve: Customer Interest
Emissions - MIL ON/DTC P0456 Stored In Memory
TSB 09-3-5
02/23/09
MALFUNCTION INDICATOR LAMP (MIL) ON WITH DIAGNOSTIC TROUBLE CODE (DTC) - P0456
FORD:
2008-2009 Focus
This article supersedes TSB 08-22-02 to update the Service Procedure.
ISSUE
Some 2008-2009 Focus vehicles may exhibit a malfunction indicator light (MIL) on with diagnostic trouble code (DTC) P0456 (very small evaporative
emission system leak detected - very small leak 0.020" (0.51 mm) diameter).
ACTION
Follow the Service Procedure steps to correct the condition.
SERVICE PROCEDURE
Perform the following diagnostic steps when P0456 is found in memory. The procedure requires validation of evaporative system leak size before
attempts to locate and repair leak. Use of the new Integrated Diagnostic System (IDS) evaporative leak test is required for this procedure.
NOTE
THE IDS EVAPORATIVE LEAK TEST IS ONLY AVAILABLE ON IDS VERSION 57.7 P10 OR LATER. IF THE TEST IS NOT AN
AVAILABLE SELECTION, UPDATE THE IDS TO THE CURRENT SOFTWARE LEVEL.
NOTE
IF THE FUEL CAP IS SUSPECT DURING VISUAL INSPECTION, DO NOT DISTURB THE CAP UNTIL THE IDS LEAK VERIFICATION
TEST IS COMPLETE.
1.
Using IDS, Version 57.7 P10 or higher, access the IDS evaporative leak test.
NOTE
WHEN PERFORMING THE IDS LEAK TEST, THE FUEL LEVEL IN THE TANK MUST BE 70%-85% (2008 MY) AND 15%-85% (2009 MY)
(AS MEASURED BY FLI PID ON IDS).
2.
Begin the IDS evaporative leak test. Follow the IDS screen prompts, ensuring all necessary parameters have been met, and continue test until results
have been provided.
NOTE
DO NOT CONTINUE WITH THIS PROCEDURE UNLESS RESULTS INDICATE - FAIL - WITH LEAK SIZE OUT OF SPECIFICATION
(EXCLUDING GROSS LEAK TEST RESULTS) AND MULTIPLE POSSIBLE CAUSES ARE LISTED.
3.
If test fails:
a. Check for loose or damaged fuel filler cap, and clean with a shop towel if dirty. Check for the tether binding and repeat IDS evaporative leak test.
If test passes, clear the DTC's, repeat self test, and return to customer. If not, proceed to Step b.
b. Check the canister vent (CV) solenoid function by capping off the fresh air hose near the CV and repeat IDS evaporative leak test. If leak test
now passes, replace CV and verify repair. If test passes, clear the DTC's, repeat self test, and return to customer.
c. If the leak is not isolated using the above procedures, the Rotunda Vacutec(R) Smoke Machine Fuel EVAP Emission System Tester with Built-in
Nitrogen Generator (218-00015) will be required to isolate the location(s) of the leak in Step 4.
4.
Connect the Rotunda Vacutec(R) Smoke Machine Fuel EVAP Emission System Tester with Built-in Nitrogen Generator (218-00015) or equivalent
to the vehicle, and run the leak detection smoke test. Refer to the Powertrain Control/Emission Diagnostics (PC/ED) Pinpoint Test HX, Workshop
Manual (WSM), Section 303-13, and machine manufacturer's instructions.
NOTE
A HYDROCARBON (COMBUSTIBLE GAS) DETECTOR CAN BE AN EFFECTIVE MEANS TO LOCATE LEAK(S) IN LOCATIONS
WHERE SMOKE EXIT IS NOT VISIBLE, SUCH AS TOP OF FUEL TANK (DO NOT USE REFRIGERANT LEAK DETECTOR).
