DME/ECM - Engine Hesitation/Stumble at Idle

Group 12
Engine Electrical

Bulletin Number
12 51 00

Woodcliff Lake, NJ
September 2000
Service Engineering

This Service Information bulletins supersedes S.I. 12 51 00 dated August 2000.

SUBJECT:
X5 3.0i Hesitates, Stumbles at Idle

MODEL:
E53 all with M54B30 produced up to 8/00

Situation:
X5 3.0i vehicles equipped with M54 engine may hesitate and stumble at idle, especially when turning the steering wheel. No fault codes are stored in the DME.

Cause:
DME/ECM calibration.

Correction:
On a customer complaint basis only, reprogram the DME with CD23 (after loading "CD23 update")

Procedure:
Check the DME/ECM for fault codes. If no fault codes are present, reprogram the DME with DIS/MoDiC programming P23.1. (P23.1 is loaded with the "CD23 update" only)

If fault codes are present, diagnose/repair the vehicle to correct any malfunctions. This reprogramming will not address any malfunctions that will cause fault codes to be stored in the DME.

The following numbers will be displayed after programming with P23.1:

Vehicle Basic control module Programmed control module
E53 w/M54B30 7509942 7510483

After programming, align the DME-EWS, clear all adaptations, and clear DME/EGS fault codes.

IMPORTANT:
If the idle was previously raised, reset the idle to "basic" value in the Idle Calibration test plan:

Under "Function Selection", select:

1. "Service Functions"
2. "DME",
3. "Calibration Idle Speed"
4. "Test Plan".
5. Select "3 Reset idle speed to basic value"
6. Select "4 End with programming"
7. Follow the direction outlined in the test plan to complete the procedure.

Warranty Information:





Covered under the terms of the BMW New SAV Limited Warranty