DTC 0704

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) (ECCS 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 5 seconds before conducting the next test.

TESTING CONDITION:
Always perform test at a temperature of 5°C (41°F) or more.


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 4.2V.
(3) Turn ignition switch "OFF" and wait at least 5 seconds.
(4) Turn ignition switch "ON" and wait at least 10 seconds.
(5) Turn ignition switch "OFF", wait at least 5 seconds and then turn "ON".
(6) Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.






Electrical Diagrams






Circuit Connectors

1 Of 2:

2 Of 2:

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 figure.
4. Check output voltage between terminal (52) and (25) (ECM 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.