EVAP System Troubleshooting
EVAP System Troubleshooting
Special Tools Required
?Vacuum Pump/Gauge, 0?30 inHg Snap-on YA4000A or equivalent, commercially available
?Vacuum/Pressure Gauge, 0?4 inHg 07JAZ-001000B
1.
EVAP canister purge valve check (open stuck):

EVAP canister purge valve check (open stuck)
?1.
Disconnect the vacuum hose (A) from the EVAP canister (B), and connect a vacuum pump/gauge, 0?30 inHg, to the hose.


?2.
Start the engine, and let it idle.
NOTE: The engine coolant temperature must be at least 140 °F (60 °C).

Signal
Current conditions
Values
Unit
ECT SENSOR 1
    

Is there vacuum?

     
YES
     
     
     
Inspect the vacuum hose routing. If OK, replace the EVAP canister purge valve.?
     
NO
     
     
     
Go to step 2.
2.
EVAP canister purge valve check (closed stuck):

EVAP canister purge valve check (closed stuck)
?1.
Hold the engine speed at 3,000 rpm without load (CVT in P or N, M/T in neutral) until the radiator fan comes on, then continue to hold the engine speed at 3,000 rpm.

Is there vacuum?

     
YES
     
     
     
Go to step 3.
     
NO
     
     
     
Inspect the vacuum hose routing. If OK, replace the EVAP canister purge valve.?
3.
EVAP canister check:

EVAP canister check
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Reconnect the vacuum hose to the EVAP canister.

?3.
Remove the fuel fill cap.

?4.
Disconnect the purge air hose (A) from the EVAP canister (B), and connect a T-fitting (C) and a vacuum gauge to the hose as shown.


?5.
Start the engine, and raise the engine speed to 3,000 rpm.

Does vacuum appear on gauge within 1 minute?

     
YES
     
     
     
Do the EVAP two way valve test. If it is OK, the evaporative emission system is OK.?
     
NO