Subaru 2009 IMPREZA Service Manual page 847

Diagnostic Trouble Code (DTC) Detecting Criteria
BK:DTC P0453 EVAPORATIVE EMISSION CONTROL SYSTEM PRESSURE
SENSOR HIGH INPUT
1. OUTLINE OF DIAGNOSIS
Detect the open or short circuit of the fuel tank pressure sensor.
Judge as NG if out of specification.
2. COMPONENT DESCRIPTION
(A) Output voltage
(1) Connector
3. ENABLE CONDITIONS
Secondary Parameters
Time needed for all secondary parame-
ters to be in enable conditions
Vehicle speed
All conditions of EVAP canister purge
Learning value of evaporation gas con-
centration (left and right)
Main feedback compensation coefficient
(left and right)
Battery voltage
4. GENERAL DRIVING CYCLE
Perform the diagnosis when purging enable conditions are met without idling.
(1)
(C)
(B) Input voltage
(2) Terminals
Enable Condition
5000 ms
2 km/h (1.2 MPH)
Completed
< 0.08
0.9
10.9 V
GD(H4SO)-123
GENERAL DESCRIPTION
(2)
(A)
(B)
(C) To fuel tank
EN-03875