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Home >> Volvo >> 2004 >> V40 Base >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control - Symptom Related Diagnostic Procedures >> Checking Set- Switch (B4204T2 CVVT; 2000) >> Checking the SET- switch >> Checking response code 3-1-1
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Checking response code 3-1-1

A response code is transmitted when the control module receives several signals from the same component or wiring circuit within 8 milliseconds. The cause of the fault may be loose connections in the terminals or a defective system component.

Fig 1: Identifying Control Module
GLL118557Courtesy of VOLVO CARS OF NORTH AMERICA.