P0452

DTC P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR







Component Description
The EVAP control system pressure sensor detects pressure in the purge line. The sensor output voltage to the ECM increases as pressure increases. The EVAP control system pressure sensor is not used to control the engine system. It is used only for on board diagnosis.

Consult-II Reference Value In Data Monitor Mode:

On Board Diagnosis Logic:

DTC Confirmation Procedure

NOTE: If "DTC 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 test at a temperature of 5 °C (41 °F) or more.

WITH CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch "OFF" and wait at least 10 seconds.
3. Turn ignition switch "ON".




4. Select "DATA MONITOR" mode with CONSULT-II.
5. Make sure that "FUEL T/TEMP SE" is more than 0 °C (32 °F).
6. Start engine and wait at least 20 seconds.
If 1st trip DTC is detected, go to "Diagnostic Procedure" below.

WITH GST
1. Start engine and warm it up to normal operating temperature.




2. Check that voltage between ECM terminal 70 (Fuel tank temperature sensor signal) and ground is less than 4.2 V.
3. Turn ignition switch "OFF" and wait at least 10 seconds.
4. Start engine and wait at least 20 seconds.
5. Select "MODE 7" with GST.
If 1st trip DTC is detected, go to "Diagnostic Procedure" below.

EC-PRE/SE-01:

Wiring Diagram

Diagnostic Procedure Step 1 - 2:

Diagnostic Procedure Step 3 - 6:

Diagnostic Procedure Step 7 - 10:

Diagnostic Procedure

Component Inspection

EVAP CONTROL SYSTEM PRESSURE SENSOR
1. Remove EVAP control system pressure sensor with its harness connector connected.
2. Remove hose from EVAP control system pressure sensor.
3. Install a vacuum pump to EVAP control system pressure sensor.







4. Turn ignition switch "ON" and check output voltage between ECM terminal 88 and ground under the given conditions.

CAUTION:
- Always calibrate the vacuum pump gauge when using it.
- Do not apply below -93.3 kPa (-700 mmHg, -27.56 inHg) or pressure over 101.3 kPa (760 mmHg, 29.92 inHg).

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