0452 Evaporative Emission System Pressure Sensor Low Input
The PCM monitors the fuel tank differential pressure sensor output voltage.
The PCM determines whether the fuel tank differential pressure sensor signal voltage is within normal operating parameters.
DTC SET CONDITIONS
Test Conditions:
Intake air temperature is greater than 5°C (41°F).
Engine speed is greater than 1,600 r/min.
Volumetric efficiency is between 25 and 80 percent.
Judgment Criteria:
When the evaporative emission purge solenoid is off, the fuel differential pressure sensor output voltage remains at 1.0 volt or less for ten seconds.
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
Malfunction of the fuel tank differential pressure sensor.
A damaged harness in the fuel tank differential pressure sensor circuit.
Malfunction of the PCM.
OVERVIEW OF TROUBLESHOOTING
DTC P0452 can be set by a faulty fuel tank differential pressure sensor or related circuit, or PCM failure.
To check a system blockage, do a performance test which uses a mechanical vacuum gauge and scan tool MB991502 set on the fuel tank differential pressure sensor (TANK PRS SNSR 73). The mechanical gauge reading is used to verify
scan tool MB991502 reading. A comparison of the mechanical gauge with the
reading on scan tool MB991502 will locate a problem in the system.
The PCM monitors the fuel tank differential pressure sensor output voltage.
The PCM determines whether the fuel tank differential pressure sensor signal voltage is within normal operating parameters.
DTC SET CONDITIONS
Test Conditions:
Intake air temperature is greater than 5°C (41°F).
Engine speed is greater than 1,600 r/min.
Volumetric efficiency is between 25 and 80 percent.
Judgment Criteria:
When the evaporative emission purge solenoid is off, the fuel differential pressure sensor output voltage remains at 1.0 volt or less for ten seconds.
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
Malfunction of the fuel tank differential pressure sensor.
A damaged harness in the fuel tank differential pressure sensor circuit.
Malfunction of the PCM.
OVERVIEW OF TROUBLESHOOTING
DTC P0452 can be set by a faulty fuel tank differential pressure sensor or related circuit, or PCM failure.
To check a system blockage, do a performance test which uses a mechanical vacuum gauge and scan tool MB991502 set on the fuel tank differential pressure sensor (TANK PRS SNSR 73). The mechanical gauge reading is used to verify
scan tool MB991502 reading. A comparison of the mechanical gauge with the
reading on scan tool MB991502 will locate a problem in the system.