DTC Description

DTC DETECTION LOGIC

This diagnosis detects leaks in the EVAP line between fuel tank and EVAP canister purge volume control solenoid valve, using the negative pressure caused by decrease of fuel temperature in the fuel tank after turning ignition switch OFF.

If ECM judges there are no leaks, the diagnosis will be OK.

DTC		M.U.T.-III SE screen terms (Trouble diagnosis content)	DTC detection condition
P0456	00	EVAP VERY SML LEAK [EVAP system leak detected (very small leak)]	Diagnosis condition	—
			Signal (terminal)	—
			Threshold	EVAP system has a leak EVAP system does not operate properly
			Diagnosis delay time	—

caution

Use only a genuine Mitsubishi Motors fuel filler cap as a replacement. If an incorrect fuel filler cap is used, the MIL may illuminate.
If the fuel filler cap is not tightened properly, the MIL may illuminate.
Use only a genuine Mitsubishi Motors rubber tube as a replacement.

POSSIBLE CAUSE

Incorrect fuel tank vacuum relief valve
Incorrect fuel filler cap used
Fuel filler cap remains open or does not close.
Foreign matter caught in fuel filler cap.
Leak is in line between intake manifold and EVAP canister purge volume control solenoid valve.
Foreign matter caught in EVAP canister vent control valve.
EVAP canister or fuel tank leaks
EVAP purge line (pipe and rubber tube) leaks
EVAP purge line rubber tube bent
Loose or disconnected rubber tube
EVAP canister vent control valve and the circuit
EVAP canister purge volume control solenoid valve and the circuit
Fuel tank temperature sensor
O-ring of EVAP canister vent control valve is missing or damaged
EVAP canister is saturated with water
EVAP control system pressure sensor
Refueling EVAP vapor cut valve
ORVR system leaks
Fuel level sensor and the circuit
Foreign matter caught in EVAP canister purge volume control solenoid valve

FAIL-SAFE

Not applicable

DTC Confirmation Procedure

1.PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test.

Turn ignition switch OFF and wait at least 10 seconds.
Turn ignition switch ON.
Turn ignition switch OFF and wait at least 10 seconds.

Do you have M.U.T.-III SE?

2.PERFORM DTC CONFIRMATION PROCEDURE-1

WITH M.U.T.-III SE

Turn ignition switch ON and select “EVAP DIAG READY” in “DATA MONITOR” mode of “ENGINE” using M.U.T.-III SE.
Start engine and wait at idle until “OFF” of “EVAP DIAG READY” changes to “ON”.
note It will take at most 2 hours until “OFF” of “EVAP DIAG READY” changes to “ON”.
Turn ignition switch OFF and wait at least 90 minutes.
note Never turn ignition switch ON during 90 minutes.
Turn ignition switch ON and select “EVAP LEAK DIAG” in “DATA MONITOR” mode of “ENGINE” using M.U.T.-III SE.
Check that “EVAP LEAK DIAG” indication.

Which is displayed on M.U.T.-III SE?

: Perform DTC CONFIRMATION PROCEDURE again.

3.PERFORM DTC CONFIRMATION PROCEDURE-2

Check 1st trip DTC.

Is 1st trip DTC detected?

Proceed to DTC Diagnosis Procedure

INSPECTION END.

4.PERFORM DTC CONFIRMATION PROCEDURE

WITH GST

Start the engine and wait engine idle for at least 2 hours.
Turn ignition switch OFF and wait at least 90 minutes.
note Never turn ignition switch ON during 90 minutes.
Turn ignition switch ON.
Check 1st trip DTC.

Is 1st trip DTC detected?

Proceed to DTC Diagnosis Procedure

-1To check malfunction symptom before repair: Refer to Intermittent IncidentIntermittent Incident

-2Confirmation after repair: INSPECTION END