Engine Controls Except For California
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 Reference Value in Data Monitor Mode
Specification data are reference values.
On Board Diagnosis Logic
DTC Confirmation Procedure
NOTE:
Never remove fuel filler cap during DTC confirmation procedure.
1. PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.
1.Turn ignition switch OFF and wait at least 10 seconds.
2.Turn ignition switch ON.
3.Turn ignition switch OFF and wait at least 10 seconds.
With CONSULT-GO TO 2.
Without CONSULT-GO TO 5.
2. PERFORM DTC CONFIRMATION PROCEDURE-1
With CONSULT
1.Start engine and let it idle for least 40 seconds.
NOTE:
Do not depress accelerator pedal even slightly.
2.Check 1st trip DTC.
Is 1st trip DTC detected?
YES- Proceed to .
NO- GO TO 3.
3. PERFORM DTC CONFIRMATION PROCEDURE-2
With CONSULT
1.Select "EVAP DIAG READY" in "DATA MONITOR" mode of "ENGINE".
2.Let it idle until "OFF" of "EVAP DIAG READY" changes to "ON".
NOTE:
It will take at most 2 hours until "OFF" of "EVAP DIAG READY" changes to "ON".
3.Turn ignition switch OFF and wait at least 90 minutes.
NOTE:
Never turn ignition switch ON during 90 minutes.
4.Turn ignition switch ON.
5.Select "EVAP LEAK DIAG" in "DATA MONITOR" mode of "ENGINE".
6.Check that "EVAP LEAK DIAG" indication.
Which is displayed on CONSULT?
CMPLT- GO TO 4.
YET- 1.Perform DTC CONFIRMATION PROCEDURE again.
2.GO TO 1.
4. PERFORM DTC CONFIRMATION PROCEDURE-3
With CONSULT
Check 1st trip DTC.
Is 1st trip DTC detected?
YES- Proceed to .
NO- INSPECTION END
5. PERFORM DTC CONFIRMATION PROCEDURE-4
With GST
1.Start engine and let it idle for least 40 seconds.
NOTE:
Do not depress accelerator pedal even slightly.
2.Check 1st trip DTC.
Is 1st trip DTC detected?
YES- Proceed to .
NO- GO TO 6.
6. PERFORM DTC CONFIRMATION PROCEDURE-5
With GST
1.Let it idle for at least 2 hours.
2.Turn ignition switch OFF and wait at least 90 minutes.
NOTE:
Never turn ignition switch ON during 90 minutes.
3.Turn ignition switch ON.
4.Check 1st trip DTC.
Is 1st trip DTC detected?
YES- Proceed to .
NO- INSPECTION END
Diagnosis Procedure
1. CHECK GROUND CONNECTIONS
1.Turn ignition switch OFF.
2.Loosen and retighten ground screws on the body.
Except For California.
-White arrow indicates : Vehicle front
-Body ground (1)
OK or NG
OK- GO TO 2.
NG- Repair or replace ground connections.
2. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR FOR WATER
1.Disconnect EVAP control system pressure sensor (1) harness connector.
-This illustration is a view from under vehicle
-EVAP canister (2)
-EVAP canister vent control valve (3)
2.Check sensor harness connector for water.
Water should not exist.
OK or NG
OK- GO TO 3.
NG- Repair or replace harness connector.
3. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
.
OK or NG
OK- GO TO 4.
NG- Replace EVAP control system pressure sensor. Removal and Installation.
4. CHECK POWER SUPPLY CIRCUITS
Check harness for short to power and short to ground, between the following terminals.
OK or NG
OK- GO TO 5.
NG- Repair short to ground or short to power in harness or connectors.
5. CHECK REFRIGERANT PRESSURE SENSOR
Refer to Refrigerant Pressure Sensor
OK or NG
OK- GO TO 6.
NG- Replace refrigerant pressure sensor. Service and Repair.
6. CHECK CRANKSHAFT POSITION SENSOR (POS)
Engine Controls Except For California.
OK or NG
OK- GO TO 7.
NG- Replace crankshaft position sensor (POS). Component.
7. CHECK APP SENSOR
Engine Controls Except For California.
OK or NG
OK- GO TO 9.
NG- GO TO 8.
8. REPLACE ACCELERATOR PEDAL ASSEMBLY
Replace accelerator pedal assembly. Removal And Installation.
-INSPECTION END
9. CHECK INTERMITTENT INCIDENT
Except For California.
For wiring diagram, Engine Controls Except For California.
-INSPECTION END
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 following conditions.
CAUTION:
- Always calibrate the vacuum pump gauge when using it.
- Do not apply below -93.3 kPa (-0.9 kg/cm2, -14 psi) or pressure over 101.3 kPa (1.0 kg/cm2, 15 psi).
4.If NG, replace EVAP control system pressure sensor. Removal and Installation.