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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-421B: Canister Purge (Cp) Valve. Signal Missing (B5254T2; B6294S2; B6294T; 2005-2006) >> Signal missing >> Checking the components and wiring >> Notes

Checking the components and wiring: Notes

Check the resistance of the evaporative emission system (EVAP) valve.

Check the signal cable between engine control module (ECM) terminal #A9 (#A9) and evaporative emission system (EVAP) valve terminal #2. Check for an open-circuit.

Check the power supply between system relay terminal #3 and evaporative emission system (EVAP) valve terminal #1. Check for an open-circuit.

Remedy as necessary.

Other information: 

Fig 1: Identifying Evaporative Emission System (EVAP) Valve Connector Terminals
GLL104075Courtesy of VOLVO CARS OF NORTH AMERICA.
Fig 2: Identifying Evaporative Emission System (EVAP) Valve
GLL107988Courtesy of VOLVO CARS OF NORTH AMERICA.