EVAP SYS PRES SEN

COMPONENT DESCRIPTION
The EVAP control system pressure sensor is installed in the purge line. The sensor detects the pressure inside the purge line and modifies the voltage signal sent from the ECM. The modified signal will then be returned to the ECM as an input voltage signal. As the pressure increases, the voltage rises. The EVAP control system pressure sensor is not directly used to control the engine system. It is used only for on board diagnosis.




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 (25) (ECM ground).




ON BOARD DIAGNOSIS LOGIC




DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE

NOTE: If "DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE" has been previously conducted, always turn ignition switch "OFF" and wait at least 10 seconds before conducting the next test.

TESTING CONDITION: Always perform the test at a temperature above 5 °C (41 °F).

With Consult
1. Start engine and warm it up to normal operating temperature.
2. Select "DATA MONITOR" mode with CONSULT.
3. Make sure that "FUEL TEMP SEN" is more than 0 °C (32 °F).
4. Turn ignition switch "OFF" and wait at least 10 seconds.
5. Turn ignition switch "ON".
6. Wait at least 20 seconds.
7. If 1st trip DTC is detected, go to "DIAGNOSTIC PROCEDURE".

OR

With Generic Scan Tools
1. Start engine and warm it up to normal operating temperature.
2. Check that voltage between ECM terminal (52) (tank fuel temperature) and ground is less than 4.2 V.
3. Turn ignition switch "OFF" and wait at least 10 seconds.
4. Turn ignition switch "ON" and wait at least 20 seconds.
5. Select "MODE 7" with GST.
6. If 1st trip DTC is detected, go to "DIAGNOSTIC PROCEDURE".

OR

Without Scan Tools
1. Start engine and warm it up to normal operating temperature.
2. Check that voltage between ECM terminal (52) (tank fuel temperature) and ground is less than 4.2 V.
3. Turn ignition switch "OFF" and wait at least 10 seconds.
4. Turn ignition switch "ON" and wait at least 10 seconds.
5. Turn ignition switch "OFF", wait at least 20 seconds and then turn "ON".
6. Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.
7. If 1st trip DTC is detected, go to "DIAGNOSTIC PROCEDURE".







WIRING DIAGRAM

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DIAGNOSTIC PROCEDURE




COMPONENT INSPECTION

EVAP control system pressure sensor
1. Remove EVAP control system pressure sensor from bracket with its harness connector connected.
2. Remove hose from EVAP control system pressure sensor.
3. Apply vacuum and pressure to EVAP control system pressure sensor with pump as shown in image.




4. Check output voltage between terminal (62) and ground.

CAUTION:
- Always calibrate the vacuum pump gauge when using it.
- Do not apply below -20 kPa (-150 mmHg, -5.91 inHg) or over 20 kPa (150 mmHg, 5.91 inHg) of pressure.

5. If NG, replace EVAP control system pressure sensor.