Question about 2001 Isuzu Trooper
To test start the car and pull off the pipe from the blue valve going to the 4wd shifter on the front axle - it should be sucking in air . now push the dash button for 4wd and pull off the pipe from the grey valve its should be sucking air now and the blue one will not .
Let us know the results as there are more tests to do .
Posted on Feb 15, 2010
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Posted on Jan 02, 2017
Tips for a great answer:
An EVAP canister, vent hose, or vent solenoid valve that has restricted flow may cause this DTC to set. Using a purge solenoid command with a scan tool will allow vacuum to be applied to the system instead of pressure. With the engine running, the EVAP canister vent solenoid valve open, and the EVAP canister purge solenoid valve commanded to 100 percent, the fuel tank vacuum should not increase to more than 5 inches H2O.
An EVAP canister filter that is restricted can cause this DTC to set. Refer to Evaporative Emission Canister Replacement .
Disconnecting one component at a time while the EVAP system is under flow will help to pinpoint a restriction in the system
Do you have a scan tool that reads data PID'S ?
Your FTP - fuel tank pressure sensor could be at fault !
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