Subaru IMPREZA GD 2007 Series Manual page 1989

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Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CU:DTC P1153 O2 SENSOR CIRCUIT RANGE/PERFORMANCE (HIGH)
(BANK 1 SENSOR 1)
1. OUTLINE OF DIAGNOSIS
Detect that λ value remains high.
Judge as NG when lambda value is abnormal in accordance with λ value of front oxygen (A/F) sensor and
running conditions such as vehicle speed, amount of intake air, engine coolant temperature, sub feedback
control, etc.
λ
value = Actual air fuel ratio/Theoreti-
cal air fuel ratio
λ > 1: Lean
λ < 1: Rich
2. COMPONENT DESCRIPTION
(2)
(4)
(1) Atmosphere
(2) Exhaust gas
(3) ZrO
2
(4) Ceramic heater
(3)
(1)
(2)
(A) Electromotive force
(B) Air fuel ratio
(C) Lean
(D) Rich
GD(H4DOTC)-198
(A)
(C) (B) (D)
EN-01693