Fuel System - MIL ON/DTC's P129F/P310B Set
01 11 11September 9, 2011
2016182 *Supersedes T.B V011010 dated June 7, 2010 to remove 2.0L T (BPY) engine applicability.*
Updated information is noted by yellow or asterisks.
Vehicle Information
Condition
MIL ON, DTC P129F and or P310B Stored in ECM Fault Memory
Technical Background
Due to fuel intrusion into the Low Pressure Side Fuel Pressure Sensor -G410-, a false signal may be sent to the ECM resulting in a reading that is out of tolerance. A false signal may result in illumination of the malfunction indicator lamp (MIL) and DTC P129F or DTC P310B being stored in fault memory.
Production Solution
Improved fuel pressure sensor -G410- to aid against fuel intrusion.
Service
Note:
DO NOT replace fuel system components for DTCs listed above before completing this technical bulletin.
For both 3.6L (BLV, BHK) FSI engines:
1. Check to ensure:
^ DTC P129F and/or P310B are stored in DTC memory.
^ No other fuel delivery system DTCs that clearly indicate a component failure (DTCs for fuel delivery system component electrical faults) are present.
2. Start engine and allow it to idle.
3. Disconnect fuel metering valve connector -N276- on high pressure fuel pump.
4. Compare fuel pressure values from MVB 103 field 1 and MVB 106 field 1.
5. If MVB 103 value deviates more than +/- 0.5 bar (7.25 psi) from MVB 106 measurement, then DTC was likely triggered by a faulty -G410- Low Side Fuel Pressure Sensor. In this case, replace -G410- low-side fuel pressure sensor. See Repair Manual Group 24 Multiport Fuel Injection (MFI) in ElsaWeb.
a. Clear DTCs and verify concern is resolved.
b. Run Basic Settings 103 to adapt system.
c. If problem persists, further fuel system diagnosis is required.
Sensor Identification
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.