Checking wiring
WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.
Check the engine control module (ECM) and canister purge (CP) valve connectors. Check for contact resistance and oxidation.
Check that the resistance in the canister purge (CP) valve between terminals #1 and #2 is approximately 21 Ω at +20 °C.
Check the signal cable between engine control module (ECM) terminal #4 and canister purge (CP) valve terminal #1. Check for an intermittent open-circuit. Remedy if necessary.
Check the power supply cable between the canister purge (CP) valve terminal #2 and system relay (2/14) terminal #5. Check for an intermittent open-circuit.
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