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Home >> Volvo >> 2011 >> XC90 Base, AWD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Electrical Components - Design And Function >> Upper Electronic Module (2003-2004) >> Diagnostic Functions >> Notes
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Diagnostic Functions: Notes

GENERAL 

The upper electronic module (UEM) has a built-in diagnostic system, the Volvo on-board diagnostic (OBD) system, which continuously monitors itself and the input and output signals.

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