P0444
P0444, P0445 EVAP Canister Purge Volume Control Solenoid Valve
Description
System Description
*1: ECM determines the start signal status by the signals of engine speed and battery voltage.
*2: This signal is sent to the ECM through CAN communication line.
This system controls flow rate of fuel vapor from the EVAP canister. The opening of the vapor by-pass passage in the EVAP canister purge volume control solenoid valve changes to control the flow rate. The EVAP canister purge volume control solenoid valve repeats ON/OFF operation according to the signal sent from the ECM. The opening of the valve varies for optimum engine control. The optimum value stored in the ECM is determined by considering various engine conditions. When the engine is operating, the flow rate of fuel vapor from the EVAP canister is regulated as the air flow changes.
Component Description
The EVAP canister purge volume control solenoid valve uses a ON/OFF duty to control the flow rate of fuel vapor from the EVAP canister. The EVAP canister purge volume control solenoid valve is moved by ON/OFF pulses from the ECM. The longer the ON pulse, the greater the amount of fuel vapor that will flow through the valve.
On Board Diagnosis Logic
DTC Confirmation Procedure
NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next step.
1 Turn ignition switch OFF and wait at least 10 seconds.
2 Turn ignition switch ON.
3 Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm battery voltage is more than 11 V at idle.
1 Start engine and let it idle for at least 13 seconds.
2 Check 1st trip DTC.
3 If 1st trip DTC is detected, go to "Diagnosis Procedure".
Diagnosis Procedure
1. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT
1 Turn ignition switch OFF.
2 Disconnect EVAP canister purge volume control solenoid valve harness connector.
3 Turn ignition switch ON.
4 Check voltage between EVAP canister purge volume control solenoid valve terminal 2 and ground with SDT or tester.
OK or NG
OK
GO TO 3.
NG
GO TO 2.
2. DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E2, F32
- Harness for open or short between EVAP canister purge volume control solenoid valve and IPDM E/R
- Harness for open or short between EVAP canister purge volume control solenoid valve and ECM
Repair harness or connectors.
3. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1 Turn ignition switch OFF.
2 Disconnect ECM harness connector.
3 Check harness continuity between ECM terminal 45 and EVAP canister purge volume control solenoid valve terminal 1. Refer to Wiring Diagram.
4 Also check harness for short to ground and short to power.
OK or NG
OK (With SDT)
GO TO 4.
OK (Without SDT)
GO TO 5.
NG
ERROR! Unknown action!Repair open circuit or short to ground or short to power in harness or connectors.
4. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION
With SDT
1 Reconnect all harness connectors disconnected.
2 Start engine.
3 Perform "PURG VOL CONT/V" in "Active test" mode with SDT. Check that engine speed varies according to the valve opening.
OK or NG
OK
GO TO 6.
NG
GO TO 5.
5. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
Refer to "Component Inspection".
OK or NG
OK
GO TO 6.
NG
Replace EVAP canister purge volume control solenoid valve. Refer to [Intake Manifold Collector: Exploded View] Intake Manifold Collector Exploded View.
6. CHECK INTERMITTENT INCIDENT
Refer to [Service Information for Electrical Incident: Intermittent Incident] Service Information for Electrical Incident: Intermittent Incident.
INSPECTION END
Component Inspection
EVAP Canister Purge Volume Control Solenoid Valve
With SDT
Check air passage continuity of EVAP canister purge volume control solenoid valve under the following conditions.
Without SDT
Check air passage continuity of EVAP canister purge volume control solenoid valve under the following conditions.
