CIS E, A/T Control Module - Revised

91vw08

Group: 25

Number: 91-02

Date: September 30, 1991


Subject: Fuel System Management Control Module, Status


Model(s): Passat, GLI, GTI, (GTX Canada only) from 1990 m.y.


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 vith automatic transmissions

^ connect VAG 1551 Tester to the vehicle (Check Repair Group D3-20-1 and D3-30-1)

^ switch VAG 1551 printer on

^ display should be as shown

* displayed alternately





^ select 1





^ press 0 then 2





^ press Q


^ read display to determine EPROM level





Note

Visual identification of Digimat ECU for EPROM level may be established by noting the production build code (WK YR) on silver label on the ECU. (arrow)
^ refer to chart on following page for correct part numbers, updated EPROM level numbers and production build codes repeat for Engine electronics 01 to determine correct fuel system management control module (ECU)


CAUTION

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


^ vehicles with manual transmission use the following fuel system management control modules (ECU's)
^ California 8A0 907 404 BA
^ 49 States and 8A0 907 404 CC Canada