P0451

DTC P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR







Component Description
The EVAP control system pressure sensor (1) detects pressure in the purge line. The sensor output voltage to the ECM increases as pressure increases.
- This illustration is a view from under vehicle
- EVAP canister (2)
- EVAP canister vent control valve (3)




CONSULT-III 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.

1. Start engine and wait at least 40 seconds.

NOTE: Do not depress accelerator pedal even slightly.

2. Check 1st trip DTC.
3. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.

Step 1-3:

Step 4-9:

Diagnostic Procedure

Component Inspection

EVAP CONTROL SYSTEM PRESSURE SENSOR
1. Remove EVAP control system pressure sensor with its harness connector connected from EVAP canister.
Always replace O-ring with a new one.
2. Install a vacuum pump to EVAP control system pressure sensor.




3. Turn ignition switch ON and check output voltage between ECM terminal 42 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).

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