Emissions - MIL ON/DTC's P0442/P0455/P0456/P2404
Condition20 07 13
Nov. 21, 2007
2015148 Supersedes T.B. Group 20 number 07-09 dated June 29, 2007 due to part number change and additional (A5) Jetta ending VIN range.
MIL ON, DTCs P0442, P0455, P0456 or P2404 Stored in ECM Fault Memory, No Leaks Present
MIL ON with one or more of the following Evaporative Emission (EVAP) DTCs stored in fault memory and no EVAP leaks are present after testing:
Technical Background
Under certain conditions, vacuum supply to the Leak Detection Pump (LDP) -V144- may be insufficient causing EVAP system leak faults to set in the ECM fault memory when there are no leaks present.
Production Solution
Revised vacuum pipe in production, Part No. 06F 133 778 B which increases vacuum supply to LDP.
Service
If any of the DTCs listed above are stored in the ECM fault memory:
^ Follow Guided Fault Finding to determine root cause of DTC(s).
^ Perform all related technical bulletins that apply.
^ Perform emission system leak test as described in the Repair Manual Group 20, Fuel Supply, Evaporative Emission (EVAP) system, checking for leaks in ElsaWeb.
Only if diagnosis is found to be inconclusive:
^ Replace the LDP vacuum supply pipe with Part No. 06F 133 778 B following procedure below:
Removal
^ Carefully remove engine cover, see Repair Manual group 24 in
ElsaWeb.
^ Disconnect vacuum hose at vacuum pipe -arrow-.
^ Remove the left vacuum pipe fastener -arrow-
^ Remove the right vacuum pipe fastener -arrow-
^ Disconnect the vacuum pipe hose at the orifice -arrow- and remove pipe.
Installation
^ Install vacuum supply pipe Part No. 06F 133 778 B follow removal procedure in the reverse order, taking care to properly position hoses, pipe and clamps in place.
^ Tighten vacuum pipe fasteners to 4 Nm (35 in.lbs.).
^ Clear codes and reset readiness code.
Warranty
Required Parts and Tools
Additional Information
All part and service references provided in this Technical Bulletin are subject to change and/or removal. Always check with your Parts Dept. and Repair Manuals for the latest information.