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M103 idle speed control M103 idle speed control
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Old 03-09-2020, 08:17 PM
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Join Date: Aug 2019
Posts: 949
Looking at a W126 wiring diagram for the M103 motor the idle air control valve is controlled by:


-1989 and older cis ecu and ovp relay
-1990 and newer just cis ecu

The M116 and M117 motors have a separate idle module for that.
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