Correction For Situation II

CORRECTION FOR SITUATION II

For E90, E92, E93, E60, E61, E82, E88, E89, and E71 vehicles where the customer complains of "Losing power when driving", fault codes 29DC/2FBF and/or 29F1/29F2 are stored in the DME with the SES illuminated; proceed as follows:

1. Use the current ISTA diagnosis software. Perform test module B1214_DI KDR (Fuel Pressure Control).





2. IMPORTANT: perform this step ONLY FOR E89 (Z4) vehicles (not equipped with the low fuel pressure system sensor):

Prior to execution of the High-pressure test module, install a calibrated manual fuel pressure gauge (e.g., P/N 83 30 0 491 260 pressure gauge from the K-LJetronic special tool kit P/N 83 30 0 491 259), connected with the three-way adapter tool 135 270, into the low-pressure fuel supply line as follows: #1. Three-way adapter tool (135 270) #2 - Pressure gauge P/N 83 30 0 491 260.

3. [NEW] Perform all applicable steps of the High-pressure Fuel test module B1214_DI KDR. Pay attention to all questions being displayed during diagnosis and answer them correctly.

Important Note:
When comparing the measured fuel pressure with the engine running at idle speed, make sure to let the fuel pressure stabilize for approximately 60 seconds prior to the final reading. Otherwise, an implausible value (around 150 bars) is going to be entered into the test, resulting in inaccurate diagnosis (defective high-pressure pump).

4. After completion of all diagnostic steps, end the test module and enter the "fault feedback" screen. Enter the result of a diagnosis process into the DiagnosisCode dialog box and obtain a "Diagnostic Code". In case no failure can be currently detected in the high-pressure fuel system, enter the last option "No fault found" into the dialog box. The obtained Diagnostic Code should be included in the comment section of the warranty claim.

IMPORTANT DIAGNOSTIC HINT:
In certain cases, the HDP fault may be reproduced only when the engine is under load. In order to replicate the complaint, it may be necessary to road-test vehicle with the manual fuel pressure gauge installed. The excessive low-pressure fuel fluctuation (between 5.0 and 7.0 bars) would indicate incorrect operation of the fuel delivery system.

5. For additional comprehensive N54 drivability diagnostic information, refer to the "N54 Engine Diagnostic Fault Tree" (the current version "03_11_10" is attached to this bulletin).

6. Make sure that FASTA data is transmitted after the completion of all appropriate test modules.

7. IMPORTANT:

Part Replacement Authorization is required (via submission of a TC Case) for replacement of the following N54 engine fuel system components: the High-pressure Pump (HDP) and High-pressure Rail Sensor on E82, E88, E89, E90, E60, E61, and E71 vehicles. For details related to the "N54 Fuel System TC Action", refer to SI B13 08 09.

8. In case the High-pressure Fuel Pump needs to be replaced, use the updated part P/N 13 51 7 594 943, which incorporates the latest improvements to internal sealing. For the pump replacement procedure, refer to RA 13 51 017.

9. After replacement, clear the adaptation values of the high-pressure flow control valve in the DME by selecting the path:

^ Activities / Service Functions

^ Drive

^ Motor Electronics

^ Adjustment Programs

^ Delete Adaptations / variants, and then Test plan

^ Reset adaptive values.

10. IMPORTANT NOTE:

In addition, vehicles which have had the HDP pump replaced have to be reprogrammed afterwards with ISTA/P 2.37.0 (or higher). The target integration levels should be:

E60/E61 - E060-10-03-501 or higher

E82/E88/E89/E90/E92/E93 - E89x-10-03-501 or higher

11. After programming, readapting the DME by means of a short test drive is recommended:

^ Bring the engine to the normal operating temperature.

^ Drive the vehicle at a speed of between 50-60 mph and engine speeds of 2,000-3,000 rpm for approximately 3 minutes (use manual gear shifting, if needed).

^ Let the engine idle for approximately 5 minutes.

^ If possible, to confirm repair effectiveness, let the vehicle sit overnight and cold start it the next morning. Then let it idle for approximately 5 minutes.