Diagnostic Aids

Since this test checks for open EVAP vacuum switch while EVAP solenoid is commanded OFF, an EVAP vacuum switch signal problem could set this DTC along with DTC P1442. If an EVAP switch problem is suspected, perform DTC P1442 diagnosis.

If a sticking solenoid is suspected, command EVAP solenoid ON and OFF several times while watching the EVAP switch for the correct display.