Canister Purge Vacuum Switching Valve (VSV)

1. Disconnect canister purge VSV harness connector, located on left fender panel, near canister. VSV harness connector wire colors are Black/White and Green/White. DO NOT confuse VSV connector with fuel pressure regulator connector.
2. Apply battery voltage to Black wire terminal of VSV connector and ground Blue wire terminal. Ensure air does not flow freely through ports "Y" and "Z". Air should flow freely between ports "X" and "Y". See Fig 1 .
3. Disconnect battery voltage from VSV connector. Ensure air flows freely through ports "Y" and "Z". Air should not flow freely through ports "X" and "Y". If VSV does not perform as indicated, replace canister purge VSV.

Fig 1: Testing Canister Purge Vacuum Switching Valve (Amigo, Pickup & Trooper 2.6L)

Courtesy of ISUZU MOTOR CO.