Code 0312
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 (M/T models)
- For 60 seconds after starting engine (After warm-up to normal operating temperature)
COMPONENT DESCRIPTION
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.
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
ECM Terminals and Reference Value
Specification data are reference values and are measured between each terminal and 43 (ECM ground).
ON BOARD DIAGNOSIS LOGIC
DTC CONFIRMATION PROCEDURE
CAUTION: Always drive vehicle at a safe speed.
NOTE:
- If DTC P1493 is displayed with P1492, first perform trouble diagnosis for DTC P1492.
- If "DTC 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. Start engine and let it idle for at least 90 seconds.
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 approximately 30 seconds.)
If "TESTING" is not displayed after 5 minutes, retry from step 2.
7. Make sure that "OK" is displayed after touching "SELF-DIAG RESULTS".
If "NG" is displayed, refer to "Diagnostic Procedure".
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.
- It is better that the fuel level is low.
1. Start engine and warm it up to normal operating temperature.
2. Select "MODE 1" with GST.
3. Check engine coolant temperature.
Engine coolant temperature: 40 - 100 °C (104 - 212 °F)
Be sure that engine coolant temperature does not exceed 100 °C (212 °F). If it becomes higher than 100 °C (212 °F), 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.
7. Select "MODE 7" with GST.
8. If 151 trip DTC is detected, go to "Diagnostic Procedure".
Without CONSULT
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.
- It is better that the fuel level is low.
1. Start engine and warm it up to normal operating temperature.
2. Check voltage between ECM terminal 51 (Engine control temperature sensor signal) and ground
Voltage: 0.8 - 1.5 V
Perform the following procedure before the voltage drops below 0.8 V. If the voltage drops below 0.8 V, 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.
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.
8. If 1st trip DTC is detected, go to "Diagnostic Procedure".
1 CHECK START:
2 CHECK VACUUM SIGNAL:
3 CHECK VACUUM SIGNAL:
4 CHECK EVAP CANISTER PURGE CONTROL SOLENOID VALVE:
5 CHECK EVAP CANISTER VENT CONTROL VALVE:
6 CHECK IF EVAP CANISTER IS SATURATED WITH WATER:
7 CHECK EVAP CANISTER:
8 DETECT MALFUNCTIONING PART:
9 CHECK EVAP CANISTER PURGE CONTROL VALVE:
10 CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR HOSE:
11 CHECK HARNESS CONNECTOR:
12 CHECK EVAP CONTROL SYSTEM PRESSURE AND CIRCUIT:
13 CHECK EVAPORATIVE EMISSION LINE:
14 CHECK INTERMITTENT INCIDENT:
DIAGNOSTIC PROCEDURE
COMPONENT INSPECTION
With CONSULT
1. Lift up driving wheels (M/T models only).
2. Turn ignition switch "ON".
3. Select "PURG CONT S/V" of "ACTIVE TEST" mode with CONSULT.
4. Start engine and warm it up to normal operating temperature.
5. Disconnect vacuum hose at EVAP canister purge control valve.
6. Touch "ON" and "OFF" and check for vacuum passing through the hose.
Without CONSULT
Check air passage continuity.
If NG or operation takes more than 1 second, replace solenoid valve.
Check EVAP canister purge control valve as follows:
1. Blow air in port A and B, then ensure that there is no leakage.
2. Plug port B and blow air in port C and check that air flows freely from port D.
3. Plug port D and blow air in port C, check that there is no leakage.
4. Apply vacuum to port A. [Approximately -13.3 to -20.0 kPa (-100 to -150 mmHg, -3.94 to -5.91 inHg)]
Plug port D and blow air in port C and ensure free flow out of port B.