TT Roadster L4-2.0L Turbo (BPY) (2008)
Fuel Pressure Sensor: All Technical Service Bulletins
Fuel System - MIL ON/Fuel Pressure DTC's Set
24 08 58
2017356/2
November 19, 2008. Supersedes Technical Service Bulletin Group 24 number 08-11 dated March 3, 2008 for reasons listed below.
Vehicle Information
01 MIL on (DTC P310B, P129F, P2293, P0087)
Condition
MIL on and one or more of the following DTCs are stored in the ECM data memory:
-
P310B (low-pressure fuel system regulation, fuel pressure outside tolerance)
-
P129F (low-pressure fuel system, pressure too high)
-
P2293 (Fuel pressure regulator 2, performance)
-
P0087 (Rail fuel pressure too low)
Technical Background
Due to fuel intrusion into the low-pressure system fuel pressure sensor (G410), a false signal may be sent to the controller resulting in a reading that is
out of tolerance.
Production Solution
Improvements to G410 fuel pressure sensor.
Service
1. Follow the indication of GFF for applicable DTCs.
2. Measure the fuel pressure using one of the following methods:
Alternative 1
1. Start engine and allow it to idle.
2. Disconnect the fuel metering valve electrical connector (N276 or N290) on the high pressure fuel pump.
3. Compare fuel pressure values from MVB 103 field 1 and MVB 106 field 1.
4. If the MVB 103 value deviates more than +/- 0.5 bar from the MVB 106 measurement, then the DTC was likely triggered by a faulty G410
low-side fuel pressure sensor. In this case, perform the Sensor Replacement Procedure below.