Subaru IMPREZA GD 2007 Series Manual page 1869

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Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
AI: DTC P0172 SYSTEM TOO RICH (BANK 1)
1. OUTLINE OF DIAGNOSIS
Detect fuel system malfunction by the amount of main feedback control.
Fuel system diagnosis
(1)
(23)
(22)
(21)
(20)
(1) Purge control solenoid valve
(2) Purge solenoid valve
(3) Pressure regulator
(4) Throttle body
(5) Fuel filter
(6) Intake manifold
(7) Engine control module (ECM)
(8) Canister
(9) Pressure control solenoid valve
Diagnostic method
Fuel system is diagnosed by comparing the target air fuel ratio calculated by ECM with the actual air fuel ratio
measured by sensor.
(3)
(2)
(24)
(13)
(19)
(18) (17) (16) (15) (14)
(10) Drain valve
(11) Drain filter
(12) Shut-off valve
(13) Vent valve
(14) Fuel temperature sensor
(15) Fuel level sensor
(16) Fuel pump
(17) Jet pump
(18) Fuel cut valve
GD(H4DOTC)-78
: A
: B
(4)
(5)
(6)
(7)
(9)
(12)
(11) (10)
(19) Fuel sub level sensor
(20) Fuel tank
(21) Fuel tank pressure sensor
(22) Fuel gauge
(23) Combination meter
(24) Fuel injector
(A) Fuel line
(B) Evaporative fuel line
(8)
EN-03873