Fuel Cap Warning Message System Troubleshooting
Fuel Cap Warning Message System Troubleshooting
NOTE
Fuel cap warning message is monitored during the engine off natural vacuum (EONV) testing.
Do this procedure if the fuel cap warning message comes on frequently, or if the message does not go off after the fuel fill cap is tightened and the vehicle is driven several days.
1.
Fuel fill cap installation check:

Fuel fill cap installation check
?1.
Check the fuel fill cap (the cap must say TIGHTEN TO CLICK). It should turn 1/4 turn after it's tight, then it clicks.

Is the correct fuel fill cap installed and properly tightened?

     
YES
     
     
     
Go to step 2.
     
NO
     
     
     
Replace the fuel fill cap or tighten the cap.?
2.
Fuel fill cap seal and fuel fill pipe mating surface visual check:

Fuel fill cap seal and fuel fill pipe mating surface visual check
?1.
Check the fuel fill cap seal (A) and the fuel fill pipe mating surface (B). Verify that the fuel fill cap tether cord (C) is not caught under the cap.


Is the fuel fill cap seal missing or damaged, is the fuel fill pipe damaged, or is the tether cord caught under the cap?

     
YES
     
     
     
     
NO
     
     
     
Go to step 3.
3.
Problem verification 1:

Problem verification 1
?1.
Reinstall and tighten the fuel fill cap.

?2.
Turn the vehicle to the ON mode.

?3.
Clear the DTC with the HDS.


?4.
Start the engine. 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 let it idle for 1 minute.

?5.
Test drive at 45 mph (72 km/h) for 1 minute or more.

Does the fuel fill cap warning message come on?

     
YES
     
     
     
The failure is duplicated. Go to step 4.
     
NO
     
     
     
Intermittent failure, the system is OK at this time.?
4.
EVAP canister purge line visual check 1 (between EVAP canister purge valve and the intake manifold):

EVAP canister purge line visual check 1 (between EVAP canister purge valve and the intake manifold)
?1.
Remove the purge hose (A) between the EVAP canister purge valve (B) and the intake manifold (C).


?2.
Clean the hose with compressed air, and check the foreign objects in the hose.

Is the hose clogged or restricted with any foreign objects?

     
YES
     
     
     
Remove the foreign objects and clear out the clogged hose, if needed, replace the hose.?
     
NO
     
     
     
The purge hose (between the EVAP canister purge valve and the throttle body) is OK, go to step 5.
5.
EVAP canister purge line visual check 2 (between EVAP canister purge valve and the EVAP canister):

EVAP canister purge line visual check 2 (between EVAP canister purge valve and the EVAP canister)
?1.
Disconnect the purge hose (A) from the EVAP canister (B).


?2.
Disconnect the purge hose (A) from the EVAP canister purge valve (B) in the engine compartment.


?3.
Clean the hose with compressed air, and check the foreign objects in the hose.

Is the hose clogged or restricted with any foreign objects?

     
YES
     
     
     
Remove the foreign objects and clear out the clogged purge hose, if needed, replace the hose.?
     
NO
     
     
     
The purge hose (between the EVAP canister purge valve and the EVAP canister) is OK, go to step 6.
6.
Problem verification 2:

Problem verification 2
?1.
Connect the purge hoses and install all removed parts.

?2.
Turn the vehicle to the ON mode.

?3.
Clear the DTC with the HDS.


?4.
Start the engine. 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 let it idle for 1 minute.

?5.
Test drive at 45 mph (72 km/h) for 1 minute or more.

Does the fuel fill cap warning message come on?

     
YES
     
     
     
     
NO
     
     
     
Intermittent failure, the system is OK at this time.?