P1447
NOTE: It both DTC PO51O and P1447 are displayed, perform TROUBLE DIAGNOSIS FOR DTC P0510 first.
SYSTEM DESCRIPTION
In this evaporative emission (EVAP) control system, purge flow occurs during non-closed throttle conditions. Purge volume is related to air intake volume. Under normal purge conditions (non-closed throttle), the EVAP canister purge volume control valve and EVAP canister purge control valve is open. Purge flow exposes the EVAP control system pressure sensor to intake manifold vacuum.
ON BOARD DIAGNOSIS LOGIC
Under normal conditions (non-closed throttle), sensor output voltage indicates if pressure drop and purge flow are adequate. If not, a fault is determined.
DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE
CAUTION: Always drive vehicle at a safe speed.
NOTE: If "DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE" has been previously conducted, always turn ignition switch "OFF" and wait at least 5 seconds before conducting the next test.
TESTING CONDITION:
Always perform test at a temperature of 5°C (41°F) or more.
With Consult
(1) Start engine and warm it up to normal operating temperature.
(2) Turn ignition switch "OFF" and wait at least 5 seconds.
(3) Start engine and let it idle for at least 1 minute.
(4) Select "PURG CN/V & S/V P1493" of "EVAPORATIVE SYSTEM" in "DTC WORK SUPPORT" mode with CONSULT.
(5) Touch "START".
(6) When the following conditions are met, "TESTING" will be displayed on the CONSULT screen. Maintain the conditions continuously until "TESTING" changes to "COMPLETED". (It will take at least 30 seconds.)
CMPS.RPM (REF): 1,000 - 3,000 rpm
Vehicle speed: 30 - 100 km/h (19 - 62 MPH)
B/FUEL SCHDL: 1 - 4.5 ms
Selector lever: Suitable position
If "TESTING" is not displayed after 5 minutes, retry from step 2).
(7) Make sure that "OK" is displayed after touching "SELFDIAG RESULTS" and go to the following step. If "NG" is displayed, refer to "DIAGNOSTIC PROCEDURE" of "TROUBLE DIAGNOSIS FOR DTC P1493".
(8) Select "PURG VOL C/V P1444" of "EVAPORATIVE SYSTEM" in "DTC WORK SUPPORT" mode with CONSULT.
(9) Touch "START".
If "COMPLETED" is displayed, go to 11).
(10) When the following conditions are met, "TESTING" will be displayed on the CONSULT screen. Maintain the conditions continuously until "TESTING" changes to "COMPLETED". (It will take at least 20 seconds.)
CMPS.RPM (REF): 1,000 - 3,000 rpm
Vehicle speed: 30 - 100 km/h (19 - 62 MPH)
B/FUEL SCHDL: 1 - 4.5 ms
Selector lever: Suitable position
If "TESTING" is not displayed after 5 minutes, retry from step 2).
(11) Make sure that "OK" is displayed after touching "SELFDIAG RESULTS" and go to the following step. If "NG" is displayed, refer to "DIAGNOSTIC PROCEDURE" of "TROUBLE DIAGNOSIS FOR DTC P1444".
(12) Select "PURG FLOW P1447" of "EVAPORATIVE SYSTEM" in "DTC CONFIRMATION" mode with CONSULT.
(13) Touch "START".
(14) When the following conditions are met, "TESTING" will be displayed on the CONSULT screen. Maintain the conditions continuously until "TESTING" changes to "COMPLETED". (It will take at least 35 seconds.)
CMPS.RPM (REF): 1,000 - 3,000 rpm
Vehicle speed: 30 - 100 km/h (19 - 62 MPH)
Selector lever: Suitable position
Engine coolant temperature: 70 - 100°C (158 - 212°F)
If "TESTING" is not displayed after 5 minutes, retry from step 2).
(15) Make sure that "OK" is displayed after touching "SELFDIAG RESULTS". If "NG" is displayed, refer to "DIAGNOSTIC PROCEDURE".
OR
OVERALL FUNCTION CHECK
Use this procedure to check the overall monitoring function of the EVAP control system purge flow. During this check, a 1st trip DTC might not be confirmed.
Without Consult
(1) Lift up drive wheels.
(2) Start engine and warm it up to normal operating temperature.
(3) Turn ignition switch "OFF", wait at least 5 seconds.
(4) Start engine and wait at least 70 seconds.
(5) Set voltmeter probes to ECM terminals (67) (EVAP control system pressure sensor signal) and (43) (ground).
(6) Check EVAP control system pressure sensor value at idle speed.
(7) Establish and maintain the following conditions for at least 1 minute.
Air conditioner switch: ON
Steering wheel: Fully turned
Headlamp switch: ON
Rear window defogger switch: ON
Engine speed: Approx. 3,000 rpm
Gear position:
M/T models
Any position other than "Neutral" or "Reverse"
A/T models
Any position other than "P", "N" or "R" Verify that EVAP control system pressure sensor value stays 0.1V less than the value at idle speed for at least 1 second.
DIAGNOSTIC PROCEDURE
COMPONENT INSPECTION
EVAP Canister Purge Volume Control Valve
With Consult
(1) Disconnect EVAP canister purge volume control valve harness connector.
(2) Check resistance between the following terminals.
terminal (2) and terminals (1), (3)
terminal (5) and terminals (4), (6)
Resistance:
Approximately 39 - 43 Ohms [At 25°C (77°F)]
(3) Reconnect EVAP canister purge volume control valve harness connector.
(4) Remove EVAP canister purge volume control valve from intake manifold collector and disconnect hoses from the valve.
(Plug the purge hoses. The EVAP canister purge volume control valve harness connector should remain connected.)
(5) Turn ignition switch "ON".
(6) Perform "PURG VOL CONT/V" in "ACTIVE TEST" mode with CONSULT. Check that EVAP canister purge volume control valve shaft moves smoothly forward and backward according to the valve opening.
If NG, replace the EVAP canister purge volume control valve.
OR
Without Consult
(1) Disconnect EVAP canister purge volume control valve harness connector.
(2) Check resistance between the following terminals.
terminal (2) and terminals (1), (3)
terminal (5) and terminals (4), (6)
Resistance:
Approximately 39 - 43 Ohms [At 25°C (77°F)]
(3) Reconnect EVAP canister purge volume control valve harness connector.
(4) Remove EVAP canister purge volume control valve from intake manifold collector and disconnect hoses from the valve.
(Plug the purge hoses. The EVAP canister purge volume control valve harness connector should remain connected.)
(5) Turn ignition switch "ON" and "OFF". Check that EVAP canister purge volume control valve shaft moves smoothly forward and backward according to the ignition switch position.
If NG, replace the EVAP canister purge volume control valve.
EVAP Canister Purge Control Valve
Check EVAP canister purge control valve as follows:
1. Blow air in port (A), (B) and (C), then ensure that there is no leakage.
2. Apply vacuum to port (A). [Approximately -13.3 to -20.0 kPa (-100 to -150 mmHg, -3.94 to -5.91 inHg)]
Blow air in port (C) and ensure free flow out of port (B).
EVAP Canister Purge Control Solenoid Valve
Check air passage continuity.
If NG, replace solenoid valve.
One-Way Valve
Check one-way valve air passage continuity.
If NG, replace one-way valve.
Make sure to install one-way valve with the colored side facing the vacuum.
EVAP Control System Pressure Sensor
1. Remove EVAP control system pressure sensor with its harness connector connected.
2. Remove hose from EVAP control system pressure sensor.
3. Use pump to apply vacuum and pressure to EVAP control system pressure sensor as shown in figure.
4. Check output voltage between ECM terminal (67) and engine ground.
CAUTION:
- Always calibrate the vacuum pump gauge when using it.
- Do not apply pressure below -20.0 kPa (-150 mm Hg, -5.91 inHg) or over 20.0 kPa (150 mmHg, 5.91 inHg).
5. If NG, replace EVAP control system pressure sensor.