Testing Procedure

NOTE: Right cylinder bank purge control valve (Y58/3) is located below right cylinder bank hot film MAF sensor (B2/7). Right cylinder bank hot film MAF sensor (B2/7) is located on left side of engine (because of intake manifold crossover). Activated charcoal canister shutoff valve (Y58/4) is located behind storage area located behind driver seat. Fuel tank pressure sensor (B4/3) is located inside fuel tank (with fuel level sender assembly). For ME-SFI control module location and identification, see ME-SFI CONTROL MODULE CONNECTOR IDENTIFICATION .

NOTE: Activated charcoal canister shutoff valve (Y58/4) and fuel tank pressure sensor (B4/3) are controlled by the right cylinder bank ME-SFI control module (N3/12).

Leaktightness - Connect jumper wire between right cylinder bank ME-SFI control module connector 1 terminals No. 26 and 34 (socket box terminals No. 26 and 34). Connecting jumper wire will allow activation of activated charcoal canister shutoff valve (Y58/4). Disconnect purge control line (at vacuum tee) to activated charcoal canister. Vacuum tee connects both purge control valves to activated charcoal canister. Connect vacuum pump to purge control line. Turn ignition on. Apply approximately 25 mbar of vacuum to purge control line. Vacuum pump should indicate a less than 5 mbar pressure drop after approximately one minute. If pressure drop is okay, test is complete. If pressure drop is not okay, possible causes are fuel tank cap leaking, purge control line to activated charcoal canister leaking, purge control line from activated charcoal canister to activated charcoal canister shutoff valve (Y58/4) leaking, activated charcoal canister defective, activated charcoal canister shutoff valve (Y58/4) defective or fuel tank pressure sensor (B4/3) defective. Repair as necessary.