Passat L4-1984cc 2.0L DOHC (9A) (1990)
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Engine Control Module: All Technical Service Bulletins
CIS E, A/T Control Module - Revised
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
