Remove the EVAP purge control valve.
Check that air should not flow (A) to (B), only when the 12-V battery is connected to the EVAP purge control valve terminals.
Check the resistance between the terminals of the EVAP purge control valve.
If the resistance is out of specification, replace the EVAP purge control valve.
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You can now recondition your old batteries at home and bring them back to 100 percent of their working condition. This guide will enable you to revive All NiCd batteries regardless of brand and battery volt. It will give you the required information on how to re-energize and revive your NiCd batteries through the RVD process, charging method and charging guidelines.