Electronic Control Unit - Improved Idle Quality

90audi05
Subject: CIS-Notronic - Electronic Control Unit -
Improved Idle Quality

Model(s): 80/90 Model Year 1989/1990
2.0 Liter 4 Cylinder Engines Only
Group: 25

Number: 90-01

Date: 07/31/90
Cause: Signal from airflow housing potentiometer causes motronic engine control system to momentarily switch into the system limp home mode. Fault code of 2232 is recorded in vehicle self diagnostics.


Production: Improved software in CIS-Motronic ECU (Yellow Dot)

As of: May 1989
VIN: 89_KA249425

Revised calibration of air-flow sensor potentiometer.

As of: August 1989
VIN: 8A_LA02923


Service: Refer to Product Circular Group 25 Number 89-05 on diagnosis and repair of idle speed fluctuation (with engine warm).