P1493
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 "ON"
- Closed throttle position
- Low engine coolant temperature
- During deceleration
- Engine stopped
- Low vehicle speed
- For 60 seconds after starting engine (After warm-up to normal operating temperature)
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
CONSULT REFERENCE VALUE IN DATA MONITOR MODE
Specification data are reference values.
ECM TERMINALS AND REFERENCE VALUE
Specification data are reference values and are measured between each terminal and (43) (ECCS ground).
ON BOARD DIAGNOSIS LOGIC
DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
- If both DTC P1492 (0807) and P1493 (0312) are displayed, first perform "TROUBLE DIAGNOSIS FOR DTC P1492".
- 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.
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) Turn ignition switch "ON".
(4) Select "PURG CN/V & S/V P1493" of "EVAPORATIVE SYSTEM" in "DTC WORK SUPPORT" mode with CONSULT
(5) Touch "START".
(6) Start engine and let it idle for at least 90 seconds.
(7) 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 approximately 30 seconds.)
Vehicle speed: 30 - 100 km/h (19 - 62 MPH)
CMPS-RPM (REF): 1,000 - 3,000 rpm
B/FUEL SCHDL: 1 - 4.5 ms
Selector lever: Suitable position
If "TESTING" is not displayed afier 5 minutes, retry from step 2).
(8) Make sure that "OK" is displayed after touching "SELFDIAG RESULTS". If "NG" is displayed, refer to "DIAGNOSTIC PROCEDURE".
OR
With Generic Tool
(1) Start engine and warm it up to normal operating temperature.
(2) Select "MODE 1" with GST.
(3) Check coolant temperature.
Coolant temperature: 40 - 100°C (104 - 212°F)
Be sure that water temperature does not exceed 100°C.
If it becomes higher than 100°C, cool down the engine and perform the procedure again from the beginning.
(4) Turn ignition switch "OFF" and wait at least 5 seconds.
(5) Restart engine and let it idle for at least 100 seconds.
(6) Maintain the following conditions for at least 30 seconds.
Vehicle speed: 40 - 80 km/h (25 - 50 MPH)
Engine speed: 1,500 - 2,500 rpm
Gear position: Suitable gear position
Coolant temperature: 40 - 100°C (104 - 212°F)
(7) Select "MODE 7" with GST.
NOTE:
- Hold the accelerator pedal as steady as possible during driving in step 6.
- If the driving conditions are not satisfied in step 6, restart the procedure.
- If is better that the fuel level is low.
Without Scan Tool
(1) Start engine and warm it up to normal operating temperature.
(2) Check voltage between ECM terminal (51) and ground
Voltage: 0.8 - 1.5V
Perform the following procedure before the voltage drops below 0.8V. If the voltage drops below 0.8V, cool down the engine and perform the entire procedure all over again.
(3) Turn ignition switch "OFF" and wait at least 5 seconds.
(4) Restart engine and let it idle for at least 100 seconds.
(5) Maintain the following conditions for at least 30 seconds.
Vehicle speed: 40 - 80 km/h (25 - 50 MPH)
Engine speed: 1,500 - 2,500 rpm
Gear position: Suitable gear position
Check voltage between ECM terminal (51) and ground: 0.8 - 1.5V
(6) Stop the vehicle, turn ignition switch "OFF", wait at least
5 seconds, and then turn "ON".
(7) Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.
NOTE:
- Hold the accelerator pedal as steady as possible during driving in step 5.
- If the driving conditions are not satisfied in step 5, restart the procedure.
- If is better that the fuel level is low.
DIAGNOSTIC PROCEDURE
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. 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 Vent Control Valve
Check air passage continuity.
With Consult
Perform "VENT CONTROL/V" in "ACTIVE TEST" mode with CONSULT.
Without Consult
If NG, clean valve using air blower or replace as necessary.
If the portion (B) is rusted, replace EVAP canister vent control valve.
Make sure new O-ring is installed properly.
Water Separator
1. Check visually for insect's nest in the water separator air inlet.
2. Check visually for cracks or flaws in the appearance.
3. Check visually for cracks or flaws in the hose.
4. Check that (A) and (C) are not clogged by blowing air into (B) with (A), and then (C) plugged.
5. In case of NG in items 2 - 4, replace the parts.
NOTE:
Do not disassemble water separator.