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Home >> Volvo >> 2004 >> S80 Base, 2.5 59, FWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control Module (ECM) Diagnostic Trouble Codes - 7 Of 11 >> ECM-431B: Leak Diagnostic Unit, Preheating. Signal Missing (B5254T2; B6294S2; B6294T; 2005-2006) >> Signal missing >> Checking the wiring

Checking the wiring

Check the cable between engine control module (ECM) terminal #B34 (#B44) and leak diagnostic unit terminal #2. Check for an open-circuit.

Remedy as necessary.

Other information 

Fig 1: Identifying Leak Diagnostic Unit Connector Terminals
GLL104218Courtesy of VOLVO CARS OF NORTH AMERICA.
Fig 2: Identifying Leak Diagnostic Pump
GLL105774Courtesy of VOLVO CARS OF NORTH AMERICA.