Evaporative Emission Control Canister: Testing and Inspection

Evaporative Canister Location (Typical):

VISUAL INSPECTION

NOTE: If Charcoal Canister is saturated with liquid fuel check for proper Purge Shutoff Switch and Pressure/Relief Rollover Valve operation.

1. Check condition and routing of vacuum hoses. Refer to Vehicle Emission Control Information (VECI) label, (underhood).
2. Ensure all vacuum hoses and electrical wires are clear of exhaust manifold to prevent deterioration. Due to temperature, vacuum hoses should always be a minimum of three inches from exhaust manifold.

NOTE: Use only fuel resistant hoses when servicing the evaporative control system.

NOTE: The Charcoal Canister and Purge Shutoff Switch are a combined unit and are not serviced separately. If the purge switch or cannister is defective the complete assembly must be replaced.

Vapor Canister Hose Connections:

EVAP CANISTER CONTROL VALVE TEST

1. Disconnect 3/16" vacuum hose from canister and connect a vacuum pump to nipple.
2. Apply 10 inches of vacuum.
3. If valve does not hold vacuum, replace canister.