Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBMW1993740IL (E32/2) V8-3982CC 4.0L DOHC (M60)REPAIR AND DIAGNOSISTRANSMISSION AND DRIVETRAINTRANSMISSION CONTROL SYSTEMSTECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSA/T - UPDATED TRANSMISSION CONTROL MODULE PROMGENERAL INFORMATION
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)
General Information
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)SECTION General Information
Group 24
Automatic Transmission
Bulletin Number
24 03 93 (3763)
Woodcliff Lake, NJ
April 1993
Product Engineering
SUBJECT:
Updated Transmission Control Module EPROM
MODELS:
740iA/iL
Complaint:
"Trans Program" displayed on the instrument cluster matrix display AND fault code 100 or 105 stored in the transmission control module.
or
Harsh 1-2 upshift and what some customers may describe as an excessive amount of gear changes, both up and down.
Cause:
Due to normal production tolerances in the transmission, each clutch has slightly different fill times and friction characteristics. The parameters on the original transmission control module EPROM may not allow the control unit sufficient time to adapt to the individual transmission's characteristics before logging a fault.
Correction:
An updated EPROM is available for the transmission control module which will solve the above complaints. Control modules which already have the updated EPROM may be identified by calling up the Identification page of the transmission control module using the BMW Service Tester or MoDiC and checking the control module Serial Number; Serial Number C2729X or greater identifies the control module as having the latest EPROM.
The transmission control module must be left disconnected from the wiring harness for at least 60 minutes after exchanging the EPROM as this will ensure that any previously stored adaptation values are erased. As the amount of time required for adaptation to occur has been increased, please be advised that installation of the EPROM and a quick trip around the block will most likely not be sufficient to provide a proper evaluation of the new software. In exceptional cases, depending on the number of shifts, it may be necessary to accumulate 50-100 miles of driving for proper evaluation of the new software.
TRANSMISSION CONTROL MODULE
EPROM Exchange Instructions
Preparatory Instructions:
The installation of the updated EPROM into the Transmission Control Module is a simple procedure.
However, before beginning the EPROM exchange, the following conditions must be provided and the designated tools must be used.
ENVIRONMENT
The work area where the EPROM is exchanged must be free of excessive dust and aggressive chemicals or vapors. A small uncarpeted office within the dealership is recommended. Since low atmospheric humidity promotes static electricity, an evaporating bowl of water can be used to raise the humidity level of the work area.
EQUIPMENT
Screwdrivers (blade type) are only used to open and close the Control Module. The EPROM is exchanged using an IC extractor/inserter set. Tool sets can be obtained locally (Radio Shack, Archer # 276-1581).
STATIC ELECTRICITY
The Transmission Control Module can be damaged and rendered unusable by static electrical discharge. For this reason the 3M static protection kit (or equivalent) must be used during the entire EPROM exchange procedure. See S.I. 04 30 87 (1546) for complete details.
EPROM STORAGE
Replacement EPROMs must be stored in the original shipment containers. The label in the center of the EPROM must never be removed.
Automatic Transmission
Bulletin Number
24 03 93 (3763)
Woodcliff Lake, NJ
April 1993
Product Engineering
SUBJECT:
Updated Transmission Control Module EPROM
MODELS:
740iA/iL
Complaint:
"Trans Program" displayed on the instrument cluster matrix display AND fault code 100 or 105 stored in the transmission control module.
or
Harsh 1-2 upshift and what some customers may describe as an excessive amount of gear changes, both up and down.
Cause:
Due to normal production tolerances in the transmission, each clutch has slightly different fill times and friction characteristics. The parameters on the original transmission control module EPROM may not allow the control unit sufficient time to adapt to the individual transmission's characteristics before logging a fault.
Correction:
An updated EPROM is available for the transmission control module which will solve the above complaints. Control modules which already have the updated EPROM may be identified by calling up the Identification page of the transmission control module using the BMW Service Tester or MoDiC and checking the control module Serial Number; Serial Number C2729X or greater identifies the control module as having the latest EPROM.
The transmission control module must be left disconnected from the wiring harness for at least 60 minutes after exchanging the EPROM as this will ensure that any previously stored adaptation values are erased. As the amount of time required for adaptation to occur has been increased, please be advised that installation of the EPROM and a quick trip around the block will most likely not be sufficient to provide a proper evaluation of the new software. In exceptional cases, depending on the number of shifts, it may be necessary to accumulate 50-100 miles of driving for proper evaluation of the new software.
TRANSMISSION CONTROL MODULE
EPROM Exchange Instructions
Preparatory Instructions:
The installation of the updated EPROM into the Transmission Control Module is a simple procedure.
However, before beginning the EPROM exchange, the following conditions must be provided and the designated tools must be used.
ENVIRONMENT
The work area where the EPROM is exchanged must be free of excessive dust and aggressive chemicals or vapors. A small uncarpeted office within the dealership is recommended. Since low atmospheric humidity promotes static electricity, an evaporating bowl of water can be used to raise the humidity level of the work area.
EQUIPMENT
Screwdrivers (blade type) are only used to open and close the Control Module. The EPROM is exchanged using an IC extractor/inserter set. Tool sets can be obtained locally (Radio Shack, Archer # 276-1581).
STATIC ELECTRICITY
The Transmission Control Module can be damaged and rendered unusable by static electrical discharge. For this reason the 3M static protection kit (or equivalent) must be used during the entire EPROM exchange procedure. See S.I. 04 30 87 (1546) for complete details.
EPROM STORAGE
Replacement EPROMs must be stored in the original shipment containers. The label in the center of the EPROM must never be removed.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.