Subaru 2009 IMPREZA Service Manual page 843

Diagnostic Trouble Code (DTC) Detecting Criteria
BI: DTC P0451 EVAPORATIVE EMISSION CONTROL SYSTEM PRESSURE
SENSOR
1. OUTLINE OF DIAGNOSIS
Detect the tank pressure sensor output property abnormality.
Judge as NG when there is no pressure variation, which should exist in the tank, considering the engine sta-
tus.
2. COMPONENT DESCRIPTION
(A) Output voltage
(1) Connector
3. ENABLE CONDITIONS
Secondary Parameters
Elapsed time after starting the engine
Fuel level
Fuel temperature
Battery voltage
Barometric pressure
4. GENERAL DRIVING CYCLE
• Perform the diagnosis continuously after 60 s have passed since the engine started.
• Pay attention to the fuel level and temperature.
(1)
(C)
(B) Input voltage
(2) Terminals
Enable Condition
60 s
9.6 2 (2.54 US gal,
2.11 Imp gal)
< 35 °C (95 °F)
10.9 V
75 kPa (563 mmHg,
22.2 inHg)
GD(H4SO)-119
GENERAL DESCRIPTION
(2)
(A)
(B)
(C) To fuel tank
EN-03875