ENGINE (DIAGNOSTICS)(H4DO) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC P2420 EVAP SYSTEM SWITCHING VALVE CONTROL CIRCUIT HIGH
DTC detecting condition:
Immediately at fault recognition
CAUTION:
After servicing or replacing faulty parts, perform Clear Memory Mode Clear Memory Mode > OPERATION">, and Inspection Mode Inspection Mode > PROCEDURE">
.
Wiring diagram:
Engine electrical system Engine Electrical System">
STEP | CHECK | YES | NO |
1.CHECK HARNESS BETWEEN ECM AND LEAK CHECK VALVE ASSEMBLY CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the leak check valve assembly.
3) Turn the ignition switch to ON.
4) Measure the voltage between leak check valve assembly and chassis ground.
Connector & terminal
(R400) No. 1 (+) — Chassis ground (−):
Is the voltage 10 V or more?
Repair the short circuit to power in harness between ECM connector and leak check valve assembly connector.
Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2420 EVAP SYSTEM SWITCHING VALVE CONTROL CIRCUIT HIGH">Go to Step 2.
2.CHECK LEAK CHECK VALVE ASSEMBLY.
1) Turn the ignition switch to OFF.
2) Check the switching valve of the leak check valve assembly. Leak Check Valve Assembly > INSPECTION">
Is the check result OK?
Repair the poor contact in the leak check valve assembly connector.
Replace the leak check valve assembly. Leak Check Valve Assembly">
1. OUTLINE OF DIAGNOSIS
Detect the open or short circuit in Evaporative Leak Check Module switching valve.
Judge as NG if out of specification.
2. COMPONENT DESCRIPTION
(1) | Leak check valve ASSY | (5) | Vacuum pump | (9) | Fuel tank |
(2) | Switching valve | (6) | Drain filter | (10) | Canister |
(3) | Reference orifice (0.02 inch orifice) | (7) | Purge control solenoid valve | ||
(4) | Pressure sensor | (8) | Intake manifold |
3. EXECUTION CONDITION
Secondary Parameters | Execution condition |
Battery voltage | ≥ 10.9 V |
Evaporative emission system switching valve command | ON |
4. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
5. DIAGNOSTIC METHOD
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
Malfunction Criteria | Threshold Value |
Measured EVAP system switching valve current | ≥ 12 A |
Time Needed for Diagnosis: 2500 ms
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.
Note
LIGHTING SYSTEM > Back-up Light SystemNOTEFor operation procedures of each component of the back-up light system, refer to the respective section.• Rear combination light assembly: Rear Combination Light Assembly">• Back-up light bulb: Back-up Light Bulb"> ...
Replacement
LUBRICATION(H4DO) > Engine OilREPLACEMENTCAUTION:If the engine oil is spilt over exhaust pipe or the under cover, wipe it off with cloth to avoid emitting smoke or causing a fire.1. Turn the ignition switch to OFF.2. Open the oil filler cap for quick draining of engine oil.3. Lift up the vehicle. ...
Fuel octane rating
Using a gasoline with a lower octane
rating can cause persistent and heavy
knocking, which can damage the engine.
Do not be concerned if your vehicle
sometimes knocks lightly when you drive
up a hill or when you accelerate. Contact
your SUBARU dealer if you use a fuel with
the specified oct ...