System Leak Inspection - Using Vacuum Pump

Whole System Inspection

1. Disconnect vacuum hose between purge solenoid valve and catch tank from purge solenoid valve. See Figure -Figure .
2. Connect hose on vacuum pump.
3. Connect scan tool to DLC-2.
4. Turn ignition switch on, engine off.
5. Using scan tool, close Canister Drain Cut Valve (CDCV) using ON BOARD DEVICE CONTROL function.
   NOTE: CDCV is closed for 10 minutes unless any of following actions is done:

   • Engine is started.
   • Ignition switch is turned off.
   • Fuel tank pressure sensor signal exceeds 1.9 in Hg (6.43 kPa).
6. Apply 1.7 kPa vacuum and monitor FTP output voltage.
7. Verify that voltage holds at specified readings for a minimum of 2 minutes.
   • If voltage does not hold, inspect fuel tank pressure sensor.
   • If fuel tank pressure sensor is okay, go to INSPECTION FROM CHARCOAL CANISTER TO FUEL TANK.

Inspection From Charcoal Canister To Purge Solenoid Valve

1. Check for loose and incorrectly installed hoses between charcoal canister and purge solenoid valve. See Figure -Figure .
2. Disconnected vacuum hose between charcoal canister and catch tank from charcoal canister.
3. Connect hose to vacuum pump.
4. Apply 1.0 in. Hg vacuum. Vacuum should hold at specified reading for a minimum of 2 minutes. If vacuum does not hold, inspect following:
   • Catch tank for plugging, damage and pinhole using vacuum pump.
   • Purge solenoid valve. See PURGE SOLENOID VALVE  .
   • Charcoal canister for damage and pinhole. See CHARCOAL CANISTER - EXCEPT MILLENIA  or CHARCOAL CANISTER - MILLENIA  .
   • CDCV for damage and leakage. See CANISTER DRAIN CUT VALVE (CDCV)  .
   • Disconnected, incorrectly installed or cracked hose from charcoal canister to CDCV.
   • Disconnected, incorrectly installed or cracked hose from purge solenoid to catch tank.
   • Disconnected, incorrectly installed or cracked hose from catch tank to charcoal canister.
   • Disconnected, incorrectly installed or cracked hose from charcoal canister to fuel tank pressure sensor.

Inspection From Charcoal Canister To Fuel Tank

1. Check for loose and incorrectly installed hoses between charcoal canister and fuel tank. See Figure -Figure .
2. Disconnect vacuum hose between charcoal canister and fuel tank charcoal canister.
3. Connect hose to vacuum pump.
4. Apply 1.7 kPa vacuum.
5. Verify that vacuum holds at specified readings for a minimum of 2 minutes. If vacuum does not hold, check following:
   • Fuel tank for damage.
   • Insufficient sealing or poorly attached accessories on fuel tank, such as fuel gauge.
   • Disconnect, incorrectly installed or cracked hose from charcoal canister to fuel tank.
   • Disconnect, incorrectly installed or cracked hose from charcoal canister to vent cut valve.
   • Disconnect, incorrectly installed or cracked hose from vent cut valve to fuel tank.