Fuel System - Fuel Pump/Control Unit Diagnostic Info.
01 A4/A5/Audi Q5 Fuel pump and control unit diagnosis01 11 31
2027351/2
October 26, 2011.
Supersedes Technical Service Bulletin Group 20 number 11 - 15 dated September 15, 2011 for reasons listed below.
Affected Vehicles
Condition
Due to a stored DTC in Engine Electronics related to the in-tank fuel pump, the in-tank fuel pump and its circuits require diagnosis.
Technical Background
Portions of the fuel pump circuitry which are monitored by the on-board diagnostic are inside the control unit for fuel pump electronics. Any diagnosis of the in-tank fuel pump should include diagnosis and evaluation of the control unit for fuel pump electronics.
Production Solution
Not applicable.
Service
1. Complete all GFF test plans related to the customer concern and repair as necessary.
2. Perform the fuel pump diagnostics published in ELSA under Engine >> Fuel Supply >> Diagnosis and Testing for Fuel Pump Electrical Checking and Fuel Pump Delivery Rate Checking. Repair the vehicle as necessary.
3. If the source of the concern is not clearly isolated using GFF test plans and ELSA diagnostics, inspect both the internal and external electrical connections of the fuel supply unit, including the fuel pump. Ensure all pins are in good condition and connections are secure, including the electrical connectors at the control unit for fuel pump electronics.
4. If a clear cause of the customer concern is not identified during the preceding diagnosis, replace the control unit for fuel pump electronics (Figure 1).
Warranty
This TSB is informational only and not applicable to any Audi warranty.
Additional Information
All parts and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Department and service manuals for the latest information.