Motorsport Engine - Runs Rough/Hesitates/Poor Response

Group 12
Engine Electrical Systems

Bulletin Number
12 02 99

Woodcliff Lake, NJ
May 1999
Product Engineering

This Service Information bulletin supersedes S.I.12 02 99 dated February 1999 which should be removed and discarded from your S.I. binder.

Changes to this revision are identified by asterisks.

SUBJECT:
Motorsport Engine Runs Rough on Cold Start

MODEL:
E36 - M3 with 352 (3.2 L) manual transmission produced 3/96 - present
Z3 - Mroadster with 352 (3.2L) manual transmission produced 2/98 - present
Z3 - Mcoupe with 352 (3.2L) manual transmission produced 6/98 - present

Situation:
Customer may complain of the following:
^ Engine runs rough during the first few minutes of engine operation following initial cold start.
^ Engine hesitates/poor throttle response during first few minutes of engine operation following initial cold start.

Correction:
IN CASE OF CUSTOMER COMPLAINT, reprogram the Engine Control Module (ECM/DME) using version P16.0 programming or higher. In order to successfully reprogram the DME a manual determination must be performed (refer to attachment) and the following part numbers must be entered (MANUAL TRANSMISSION ONLY):

P/N Basic P/N Programmed
Model Control Module Control Module

M3, M3 Conv 1406464 7830455
Mroadster, Mcoupe 1406464 7830457

**IF THIS REPROGRAMMING IS MISTAKENLY PERFORMED ON A VEHICLE WITH AN AUTOMATIC TRANSMISSION THE FOLLOWING FAULT WILL SET IN THE AGS MODULE CAUSING TRANS. FAIL-SAFE OPERATION.

FC 152- CAN ENGINE INTERVENTION

IF THIS OCCURS THE CONTROL MODULE MUST BE REPROGRAMMED BY PERFORMING A MANUAL DETERMINATION AND THE PART NUMBERS LOCATED ON THE COVER OF THE CONTROL MODULE MUST BE ENTERED TO REVERT BACK TO THE CONTROL MODULE'S ORIGINAL PROGRAMMING.**

Procedure:
1. Printout DME identification Screen

2. Reprogram DME by performing a manual determination and enter the following part numbers based on model.

P/N Basic P/N Programmed
Model Control Module Control Module

M3, M3 Conv 1406464 7830455
Mroadster, Mcoupe 1406464 7830457

3. Programming Hints:
a. Upon selecting programming - the ignition switch must be cycled oft for 10 seconds and then back on when the following message is displayed:

"M541.2
Install new basic control unit.
Turn on ignition."

b. When the status bar for "Data programming active!" is displayed - The bar may go to 95% completion and the following error message may be displayed:
MS 41.2
Programming cannot be performed correctly!
Test code 012400
Repeat programming if necessary.

When this message is displayed go to diagnostics and view the DME identification screen.

If the manually entered programmed control module number appears on the screen and no error message such as "This control module is not correctly programmed." appears, cycle the ignition switch oft for 10 seconds before starting the engine.

If the error message "This control module is not correctly programmed." appears, reprogram the DME again using manual determination and enter the P/N given in step 2.

Warranty Information:

Parts and labor will be reimbursable under the terms of the applicable New Vehicle Limited Warranty.

**Defect Code: 10 32 92 35 00**

Labor Operation: 12 14 710
Labor Allowance: 6 FRU

PROGRAMMING OF ENGINE CONTROL MODULE (DME)

Flowchart:

A:

B:

The following flow chart provides information on how to perform a determination and programming/update of a currently installed or replacement flash" control module using the MODIC or DIS.