Campaign - Electronic Throttle EML System Updates: Overview

Group: 12
Engine Electrical Systems

Bulletin Number
12 07 96

Woodcliff Lake, NJ
September 1996
Product Engineering

PERFORM THE PROCEDURE OUTLINED IN THIS SERVICE INFORMATION ON ALL AFFECTED VEHICLES THE NEXT TIME THEY ARE IN THE SHOP FOR MAINTENANCE OR REPAIRS.

SUBJECT:
E38 - M73 EML System Updates

MODEL:
750iLA with M73 engine produced 1/95 - 3/96

Situation:

The "Check Engine" lamp is illuminated, check control or MID may display "Engine Failsafe Program" and any of the following faults may be set in the fault memory of the EML control module:

^ 138, 139, 140, 141, 142, 143, 144, 145

^ 44, 45, 46, 47, 48, 49, 50, 51

Affected Vehicles:

This service action involves E38 vehicles with M73 engines produced up to 3/96

In order to determine if a specific vehicle is affected by this Service Action, it will be necessary to utilize the "Service Menu" of the DCS (Dealer Communication System. Based on the response of the system, either proceed with the corrective action or take no further action.

The Chassis Number Ranges listed below are only for informational purposes and are not to be considered as the only deciding factor.

Model Chassis Number Ranges

750iLA DH66004 - DH67756
750iLA DL10048 - DL10057

Correction:

Based on the defect code stated on DCS for all affected vehicles:

^ Both throttle housing assemblies (DK motors) may need to be checked/replaced to insure that the latest version is installed.

^ The thickness of the PWG wiring harness will need to be checked and the PWG harness may need to be replaced based on the results of the check.

In order to effectively check the thickness of the wiring used in the PWG harness, special tool P/N 90 88 6 127 400 will be sent out via automatic tool shipment to all BMW automotive dealers. The special tool consists of:

1 - Wire gauge with a 3.95 mm slot
3 - Wire size samples (one correct size & two incorrect sizes)





The special tool must be used to check the thickness of the three individual wires that make up the PWG harness (1).





IF THE CORRECT SIZE WIRE (1) IS INSTALLED IN THE VEHICLE IT WILL NOT FIT INTO THE SLOT OF THE SPECIAL TEST TOOL.

If it is determined that the latest version throttle housing assembly is not installed and/or the wiring harness is too thin, the latest components need to be installed. The procedure indicated below must be followed in order to determine which repair(s) need to be made.

Procedure:

The information indicated in this section must be followed in order to determine which repairs need to be made on the affected vehicle.

1. Determine which defect codes apply to the vehicle.





2. Refer to the table to determine which specific section of the attached procedure applies to the vehicle, based on the defect code stated on DCS:

3. After completing the installation(s) certain adaptive functions for the EML system must be reset. Refer to section C of the attached procedure.