Nissan Altima 2007-2012 Service Manual: P0451 Evap control system pressure sensor

Description

The EVAP control system pressure sensor detects pressure in the purge line. The sensor output voltage to the ECM increases as pressure increases.

DTC Logic

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following 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.

>> GO TO 2.

2.PERFORM DTC CONFIRMATION PROCEDURE

1. Start engine and wait at least 40 seconds.

NOTE: Do not depress accelerator pedal even slightly.

2. Check 1st trip DTC.

Is 1st trip DTC detected? YES >> Go to EC-1332, "Diagnosis Procedure".

NO >> INSPECTION END

Diagnosis Procedure

1.CHECK GROUND CONNECTION

1. Turn ignition switch OFF.

2. Check ground connection E9. Refer to Ground Inspection in GI-45, "Circuit Inspection".

Is the inspection result normal? YES >> GO TO 2.

NO >> Repair or replace ground connection.

2.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR FOR WATER

1. Disconnect EVAP control system pressure sensor harness connector.

2. Check that water is not inside connectors.

Is the inspection result normal? YES >> GO TO 3.

NO >> Repair or replace harness connector.

3.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY CIRCUIT

1. Turn ignition switch ON.

2. Check the voltage between EVAP control system pressure sensor harness connector and ground.

Is the inspection result normal? YES >> GO TO 8.

NO >> GO TO 4.

4.CHECK SENSOR POWER SUPPLY CIRCUIT

Check harness for short to power and short to ground, between the following terminals.

Is the inspection result normal? YES >> GO TO 5.

NO >> Repair short to ground or short to power in harness or connectors.

5.CHECK COMPONENTS

Check the following.

• Crankshaft position sensor (POS) (Refer to EC-1295, "Component Inspection".) • Refrigerant pressure sensor (Refer to EC-1503, "Diagnosis Procedure".) Is the inspection result normal? YES >> GO TO 6.

NO >> Replace malfunctioning components.

6.CHECK APP SENSOR

Refer to EC-1450, "Component Inspection".

Is the inspection result normal? YES >> GO TO 9.

NO >> GO TO 7.

7.REPLACE ACCELERATOR PEDAL ASSEMBLY

1. Replace accelerator pedal assembly.

2. Go to EC-1450, "Special Repair Requirement".

>> INSPECTION END

8.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to EC-1334, "Component Inspection".

Is the inspection result normal? YES >> GO TO 9.

NO >> Replace EVAP control system pressure sensor.

9.CHECK INTERMITTENT INCIDENT

Refer to GI-42, "Intermittent Incident".

>> INSPECTION END

Component Inspection

1.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

1. Turn ignition switch OFF.

2. Remove EVAP control system pressure sensor with its harness connector.

Always replace O-ring with a new one.

3. Install a vacuum pump to EVAP control system pressure sensor.

4. Turn ignition switch ON and check output voltage between ECM terminals under the following conditions.

CAUTION: • Always calibrate the vacuum pump gauge when using it.

• Never apply below -93.3 kPa (-0.952 kg/cm2, -13.53 psi) or pressure over 101.3 kPa (1.033 kg/cm2, 14.69 psi). Is the inspection result normal? YES >> INSPECTION END

NO >> Replace EVAP control system pressure sensor

    P0448 Evap canister vent control valve
    Description The EVAP canister vent control valve is located on the EVAP canister and is used to seal the canister vent. This solenoid valve responds to signals from the ECM. When the ECM sends a ...

    P0452 Evap control system pressure sensor
    Description The EVAP control system pressure sensor detects pressure in the purge line. The sensor output voltage to the ECM increases as pressure increases. DTC Logic DTC DETECTION LOGIC DT ...

    Other materials:

    P0603 ECM Power supply
    Description Battery voltage is supplied to the ECM even when the ignition switch is turned OFF for the ECM memory function of the DTC memory, the air-fuel ratio feedback compensation value memory, the idle air volume learning value memory, etc. DTC Logic DTC DETECTION LOGIC DTC CONFIRMAT ...

    B1049 – B1052, B1054 – B1057 driver airbag module
    Description DTC B1049 – B1052, B1054 – B1057 DRIVER AIRBAG MODULE The driver air bag module is dual stage and wired to the air bag diagnosis sensor unit through the spiral cable. The air bag diagnosis sensor unit will monitor for opens and shorts in detected lines to the driver air bag ...

    AV control unit (sedan)
    Reference Value VALUES ON THE DIAGNOSIS TOOL CONSULT-III data monitor item TERMINAL LAYOUT PHYSICAL VALUES Wiring Diagram DTC Index ...