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:
B2601 shift position
Description
BCM confirms the shift position with the following 2 signals.
• CVT selector lever
• P position signal from IPDM E/R (CAN)
DTC Logic
DTC DETECTION LOGIC
NOTE:
• If DTC B2601 is displayed with DTC U1000, first perform the trouble diagnosis
for DTC U1000. Refer to
SEC-4 ...
P2127, P2128 APP Sensor
Description
The accelerator pedal position sensor is installed on the upper end
of the accelerator pedal assembly. The sensor detects the accelerator
position and sends a signal to the ECM.
Accelerator pedal position sensor has two sensors. These sensors
are a kind of potentiometers which tr ...
Engine coolant
Changing Engine Coolant
WARNING:
• To avoid being scalded, never change the coolant when the engine is hot.
• Wrap a thick cloth around cap and carefully remove the cap. First, turn the
cap a quarter of a turn to
release built-up pressure. Then push down and turn the cap all the way to
...