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Possible Causes

Malfunction is detected when an excessively high voltage is sent to ECM from EVAP-CSPS. Possible causes are:

EVAP-CSPS circuit open or shorted.
Defective EVAP-CSPS.
Defective EVAP Canister Vent Control Valve (EVAP-CVCV).
Defective EVAP canister
Defective water separator.
Defective hose between EVAP-CVCV and water separator.

NOTE: Before proceeding, ensure ambient temperature is more than 41°F (5°C).