P0444
DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
Description
SYSTEM DESCRIPTION
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.
CONSULT Reference Value in Data Monitor Mode
Specification data are reference values.
On Board Diagnosis Logic
DTC Confirmation Procedure
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.
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 .
Wiring Diagram
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
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 (1) harness connector.
3.Turn ignition switch ON.
4.Check voltage between EVAP canister purge volume control solenoid valve terminal 1 and ground with CONSULT or tester.
Voltage: Battery voltage
OK or NG
OK- GO TO 3.
NG- GO TO 2.
2. DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E8, F8
- Harness for open or short between EVAP canister purge volume control solenoid valve and IPDM E/R
- Repair open circuit or short to ground or short to power in 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 9 and EVAP canister purge volume control solenoid valve terminal 2. Refer to Wiring Diagram.
Continuity should exist.
4.Also check harness for short to ground and short to power.
OK or NG
OK (With CONSULT)-GO TO 4.
OK (Without CONSULT)-GO TO 5.
NG- 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 CONSULT
1.Reconnect all harness connectors disconnected.
2.Start engine.
3.Perform "PURG VOL CONT/V" in "ACTIVE TEST" mode with CONSULT. 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
P0443.
OK or NG
OK- GO TO 6.
NG- Replace EVAP canister purge volume control solenoid valve. Component.
6. CHECK INTERMITTENT INCIDENT
Refer to Trouble Diagnosis For Intermittent Incident
-INSPECTION END
Component Inspection
EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
With CONSULT
Check air passage continuity of EVAP canister purge volume control solenoid valve under the following conditions.
Without CONSULT
Check air passage continuity of EVAP canister purge volume control solenoid valve under the following conditions.
