Engine/Fuel - MIL ON/DTCs P0087/P1093/P2293

15 12 02

August 20, 2012

2015153 *Supersedes T.B. V151103 dated December 21, 2011 to emphasize the
importance of changing the oil and filter when excessive cam follower wear is found.*





Vehicle Information

Condition

MIL ON, DTC P0087, P1093 or P2293 Stored in ECM Fault Memory





MIL ON, the following DTCs may be stored in ECM fault memory:

Technical Background

Excessive wear of intake camshaft lobe that drives the high pressure fuel pump. The wear limits maximum pump piston lift, causing fuel rail pressure fluctuations.

The wear on the camshaft lobe can also lead to wear on the base of the high pressure fuel pump cam follower.

Note:
Please review with customer the importance of using proper engine oil. Use of engine oil that does not meet VW quality standards can cause premature wear to engine components. Refer to Technical Bulletin Instance 2012855 Engine Oils Which Meet Volkswagen Oil Quality Standards VW 502 00, VW 505 01 and VW 504 00/507 00.

Production Solution

Increase surface hardening of camshaft lobe for the high pressure fuel pump. Improved intake camshafts have Part No. 06F109101B.

Service

Inspection

If there are low pressure faults stored in the ECM like P310b or P129f, always diagnose low pressure faults first before diagnosing high pressure faults.

Note:
DO NOT REPLACE high pressure pump for low pressure faults.





Remove the high pressure fuel pump and visually inspect:

1. Base surface of the cam follower -6- in contact with the camshaft lobe.

2. Tip of the high pressure fuel pump plunger.





Inspect the tip of the high pressure fuel pump plunger (Figure 2) for excessive wear.

Note:
If plunger tip of fuel pump is NOT WORN, DO NOT REPLACE the fuel pump.

If excessive wear is found the high pressure pump must also be replaced, see Group 20 Fuel Supply in ElsaWeb.





Tip:
High pressure fuel pump plunger damage is only possible if the cam follower base has a hole in it as seen in figure 3 inset -A-, and the plunger tip has come in direct contact with the camshaft lobe (figure 4).

Repair Procedure









Warranty







Required Parts and Tools

No Special Tools required.

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.