Engine Will Not Start With Possible Mil/EPC On (P0087, P0088, P310B) (GROUP 24, NO. 10-42)
Reference number: GROUP 24, NO. 10-42
Supersedes refnos: 2017475, GROUP 24, NO. 08-16, GROUP 24, NO. 08-63, GROUP 24, NO. 09-08, GROUP 24, NO. 10-34
ENGINE WILL NOT START WITH POSSIBLE MIL/EPC ON (P0087, P0088, P310B)
TECHNICAL SERVICE BULLETIN
| AUDI: | R8 2009; S5 2009; A6 2007 - 2009; S6 2007 - 2009; A8 2007 - 2009; S8 2007 - 2009; Audi Q7 2007 - 2009 |
| GROUP: | 24 - Multiport Fuel Injection |
SUBJECT
Engine will not start with possible MIL/EPC on (P0087, P0088, P310B)
24 10 42 2017475/5 July 15, 2010. Supersedes Technical Service Bulletin Group 24 number 10-34 dated June 16, 2010.
| Model(s) | Year | VIN Range | Vehicle-Specific Equipment |
|---|---|---|---|
| R8 | 2009 | All | BYH Engine |
| S5 | 2009 | All | CAUA Engine |
| A6 | 2007 - 2009 | All | BVJ Engine |
| S6 | 2007 - 2009 | All | BXA Engine |
| A8 | 2007 - 2009 | All | BVJ Engine |
| S8 | 2007 - 2009 | All | BSM Engine |
| Audi Q7 | 2007 - 2009 | All | BAR Engine |
CONDITION
- Engine doesn't start.
- The following DTC entries may be logged in the fault memory individually or in combination:
- P0087 (Fuel Rail/System Pressure - Too Low).
- P0088 (Fuel Rail/System Pressure - Too High).
- P310 B (Low Fuel Pressure Regulation, fuel pressure outside of tolerance).
TECHNICAL BACKGROUND
A general increase of the rail pressure after shutting off engine is normal, but rail pressure that is too high (above 140bar) can prevent the starting authorization.
This can be caused by incorrectly installed or malfunctioning pressure relief valves or a blockage on the low fuel pressure system return lines.
PRODUCTION SOLUTION
No change.
SERVICE
ENGINE DOES NOT START, WITH NO DTC ENTRY
- In Guided Fault Finding, look for perception symptoms without entry.
When the memory is empty, follow the following path in GFF: Complaint report >> Complaint related to observation >> Powertrain (RG 01; 10-39) >> Engine >> Start >> Engine does not start after short standing time . Press accept. Press green arrow on right to proceed.
- Check the fuel pressure.
If the engine does not start although the low pressure system is correct, the following message appears in the test program: "If the engine only does not start when hot, a stuck pressure relief valve or a blockage in the low pressure return system may cause the condition. Because of the hot engine, the fuel expands after switching off the engine and increases the fuel pressure to such an extent that the engine control unit can prevent an engine start. Let the engine cool down and try to start the engine. If the engine starts when the vehicle is cool, check the pressure relief valve and the low pressure return system."
WHEN DTC ENTRIES ARE PRESENT
- First check the low and high pressure in the fuel system using the appropriate MVB for the rail fuel pressure in GFF.
- If both the low and high fuel pressures are correct, check the low fuel pressure return lines and the pressure relief valves in the rail for a blockage. Replace them if necessary.
Follow GFF consistently to the end to avoid any unnecessary parts replacement.
WARRANTY
| Claim Type: | Use applicable claim type. If vehicle is outside any warranty, this Technical Service Bulletin is informational only. | ||
| Service Number: | 2409 | ||
| Damage Code: | 0040 | ||
| Diagnostic Time: | GFF tests | 0150 0000 | 50 TU max |
| Road test prior to service procedure | No allowance | 0 TU | |
| Road test after service procedure | 0121 0004 | 10 TU | |
| Technical diagnosis at dealer's discretion (Refer to Section 2.2.1.2 and Audi Warranty Online for DADP allowance details) |
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| Claim Comment: | As per TSB #2017475/5 | ||
ADDITIONAL INFORMATION
All part and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Dept. and service manuals for the latest information.