P0443
SYSTEM DESCRIPTION
This system controls the vacuum signal applied to the EVAP canister purge control valve. When the ECM detects any of the following conditions, current does not flow through the EVAP canister purge control solenoid valve.
The solenoid valve cuts the vacuum signal so that the EVAP canister purge control valve remains closed.
- Ignition switch "OFF"
- Closed throttle position
- Low or high engine coolant temperature
- During deceleration
- Engine stopped
- Low vehicle speed
COMPONENT DESCRIPTION
EVAP Canister Purge Control Solenoid Valve
The EVAP canister purge control solenoid valve responds to signals from the ECM. When the ECM sends an OFF signal, the vacuum signal (from the intake manifold to the EVAP canister purge control valve) is cut.
When the ECM sends an ON (ground) signal, the vacuum signal passes through the EVAP canister purge control solenoid valve. The signal then opens the EVAP canister purge control valve.
EVAP Canister Purge Control Valve
When the vacuum signal is cut by EVAP canister purge control solenoid valve, EVAP canister purge control valve closes.
EVAPORATIVE EMISSION SYSTEM DIAGRAM
DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE
Perform "Procedure for malfunction A" first. If the (1st trip) DTC cannot be confirmed, perform "Procedure for malfunction B".
Procedure for Malfunction A
With Consult
(1) Turn ignition switch "ON".
(2) Select "DATA MONITOR" mode with CONSULT.
(3) Wait at least 5 seconds.
OR
With GST
(1) Turn ignition switch "ON" and wait at least 5 seconds.
(2) Select "MODE 7" with GST.
OR
No Tools
(1) Turn ignition switch "ON" and wait at least 5 seconds.
(2) Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.
Procedure for Malfunction B
With Consult
(1) Jack up drive wheels.
(2) Turn ignition switch "ON" and select "DATA MONITOR" mode with CONSULT.
(3) Start engine and warm it up until the engine coolant temperature rises to 60 to 80°C (140 to 176°F), then stop engine. (If the engine coolant temperature exceeds the above range, stop engine and wait until the temperature cools down to within this range.)
(4) Start engine and let it idle for at least 70 seconds.
(5) Maintain the following conditions for at least 30 seconds.
Gear position:
"2" or "D" range (A/T)
"3rd" or "4th" gear (M/T)
Vehicle speed: 40 - 80 km/h (25 - 50 MPH)
Engine speed: 1,500 - 2,500 rpm
Engine coolant temperature: Less than 100°C (212°F)
OR
With GST
(1) Jack up drive wheels.
(2) Turn ignition switch "ON" and select "MODE 1" mode with GST.
(3) Start engine and warm it up until the engine coolant temperature rises to 60 to 80° (140 to 176°F), then stop engine. (If the engine coolant temperature exceeds the above range, stop engine and wait until the temperature cools down to within this range.)
(4) Start engine and let it idle for at least 70 seconds.
(5) Maintain the following conditions for at least 30 seconds.
Gear position:
"2" or "D" range (A/T)
"3rd" or "4th" gear (M/T)
Vehicle speed: 40 - 80 km/h (25 - 50 MPH)
Engine speed: 1,500 - 2,500 rpm
Engine coolant temperature: Less than 100°C (212°F)
(6) Select "MODE 7" mode with GST.
OR
No Tools
(1) Jack up drive wheels.
(2) Turn ignition switch "ON".
(3) Start engine and warm it up until the voltage between ECM terminal (51) and ground drops to 1.2 to 1.9V. (If the voltage drops below the above range, stop engine and wait until the voltage rises to within this range.)
(4) Start engine and let it idle for at least 70 seconds.
(5) Maintain the following conditions for at least 30 seconds.
Gear position:
"2" or "D" range (A/T)
"3rd" or "4th" gear (M/T)
Vehicle speed: 40 - 80 km/h (25 - 50 MPH)
Engine speed: 1,500 - 2,500 rpm
Voltage between ECM terminal (51) and ground: More than 0.8V
(6) Turn ignition switch "OFF", wait at least 5 seconds and then turn "ON".
(7) Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.
DIAGNOSTIC PROCEDURES
Procedure for Malfunction A
Procedure for Malfunction B
EC-CANI/V-01 Evaporative Emission (EVAP) Canister Purge Control Valve/Solenoid Valve (DTC P0443):
WIRING DIAGRAM
COMPONENT INSPECTION
EVAP Canister Purge Control Solenoid Valve
Check air passage continuity.
If NG, replace solenoid valve.
EVAP Canister Purge Control Valve
Check EVAP canister purge control valve as follows.
1. Plug the port (B).
2. Apply pressure [80.0 kPa (600 mmHg, 23.132 inHg, 11.60 psi)] to port (A). Then keep it for 15 seconds, and check there is no leakage.
3. Repeat step 2 for port (C).