Fuel System Management Control Module, Status (GROUP 25, NO. 92-01)

Publication date: 1992-01-31
Reference number: GROUP 25, NO. 92-01
Supersedes refnos: GROUP 25, NO. 91-02

FUEL SYSTEM MANAGEMENT CONTROL MODULE, STATUS

TECHNICAL SERVICE BULLETIN

Reference Number(s): GROUP 25, NO. 91-02, GROUP 25, NO. 92-01, Date of Issue: January 31, 1992
Superceded Bulletin(s): Group 25, No, 91-02, Date of Issue: September 30, 1991

FUEL SYSTEM MANAGEMENT CONTROL MODULE, STATUS

Model(s): 1990-on Volkswagen Passat, GLI, GTI, (GTX Canada only)

Group: 25 - Continuous Fuel Injection

Bulletin No.: 92-01

Date: January 31, 1992

NOTE: This bulletin supersedes Technical Bulletin Group 25, No, 91-02 dated September 30, 1991.

CONDITION

Due to hardware and software changes in the fuel system management control module (CIS-E Motronic) over the last few months, the part numbers of the fuel system management control modules, have been changed.

These changes were made to improve the interface between the fuel system management control module (CIS-E Motronic ECU) and the transmission control module (Digimat Automatic Transmission ECU) and to improve the performance of the vehicle.

The changes address the following:

Poor cold start at high ambient temperatures
Low idle when in drive gear position (automatic transmission only)
Stalling or surging when A/C clutch is disengaged
Poor acceleration performance

SERVICE

When one of the above listed driveability complaints is encountered, establish the EPROM level of the Transmission Control Module (Digimat ECU) and the part number of the Fuel System Management Control Module (Motronic ECU) installed in the vehicle prior to servicing.

PASSAT VEHICLES WITH AUTOMATIC TRANSMISSIONS

Connect VAG 1551 Tester to the vehicle. See Fig 4 .

Switch VAG 1551 printer on.

Display will show the following:

Fig 1: SCREEN 1

Press 0 then 2.

Display will show the following:

Fig 2: SCREEN 3

Press Q.

Display will show the following:

Fig 3: SCREEN 4

Read display to determine EPROM level.

Refer to chart below to determine correct part numbers and EPROM level.

Repeat for Engine Electronics 01 to determine correct fuel system management control module (ECU).

ECU IDENTIFICATION CHART

REGION	New Fuel System Management Control Module (Motronic ECU)	New Transmission Control Module (Digimat ECU)	Old Trans. Control Module (Old Digimat ECU)	Economy Sport Switch
California	8A0 907 404 EA	095 927 731 AF With EPROM 0616 or higher	AF	Push
California	8A0 907 404 EA	095 927 731 AF With EPROM 0616 or higher	S	button switch
California	8A0 907 404 BA	095 927 731 AP With EPROM 0638 or higher	AP	Rotary
California	8A0 907 404 BA	095 927 731 AP With EPROM 0638 or higher	AJ	switch
49 States And Canada	8A0 907 404 FA	095 927 731 AE With EPROM 0615 or higher	AE	Push
49 States And Canada	8A0 907 404 FA	095 927 731 AE With EPROM 0615 or higher	R	button switch
49 States And Canada	8A0 907 404 CC	095 927 731 AQ With EPROM 0639 or higher	AQ	Rotary
49 States And Canada	or 8A0 907 404 CB	095 927 731 AQ With EPROM 0639 or higher	AL	switch

Vehicles with manual transmission use the following fuel system management control modules (ECU's)

California ............... 8A0 907 404 BA or EA
49 States and Canada ..... 8A0 907 404 CC, CB, or FA

CAUTION: Part numbers are for reference only. Always check with your Parts Department for latest parts information.

Fig 4: Connecting VAG 1551 Tester