Workshop Manual

6E–343
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code(DTC)P0456 EVAP Very Small Leak
Step Action Value(s) Yes No
1 Was the “On-Board(OBD)System Check” performed?
— Go to Step 2
Go to OBD
System
Check
2 1. Ignition “OFF”.
2. Remove the fuel cap.
3. Ignition “ON”.
4. Observe “Fuel Tank Pressure” on the Tech 2.
Does the Tech 2 indicate “Fuel Tank Pressure” at the
specified value?
1.51V Go to Step 3
Go to Fuel
Tank
Pressure
System
3 1. Visually/physically check for the following
conditions:
B Vent hose disconnected or damaged.
B EVAP canister damaged.
B Fuel cap damaged
2. If a problem is found, repair as necessary.
Was a problem found?
— Verify repair Go to Step 4
4 1. Ignition “ON”, engine “OFF”.
2. Install the fuel cap.
3. Review and record Tech 2 Failure Records data.
4. Operate the vehicle within Failure Records
conditions as noted.
5. Using theTech 2,monitor the “DTC” info for DTC
P0456.
Does the Tech 2 indicate DTC P0456?
— Go to Step 5
Refer to
Diagnostic
Aids
5 1. Ignition “ON”, engine idling.
2. Observe “Fuel Tank Pressure” on the Tech 2.
Does the Tech 2 indicate “Fuel Tank Pressure” at the
specified value?
—
Refer to
Diagnostic
Aids
Go to Step 6
6 1. Ignition “ON”, engine idling.
2. Using theTech 2, command the EVAP canister vent
solenoid “ON” (closed)
3. Observe “EVAP canister vent solenoid operation”
second value?
4. If a problem is found, repair as necessary.
Was a problem found?
— Verify repair Go to Step 7
7 1. Visually/physically check for the following
conditions:
B Disconnected or leaking fuel tank vapor line.
B Disconnected or damaged EVAP purge line.
2. If a problem is found, repair as necessary.
Was a problem found?
— Verify repair
Refer to
Diagnostic
Aids