Wednesday, December 1, 2021

2010 Cadillac Truck SRX FWD V6-3.0L Page 1213

2010 Cadillac Truck SRX FWD V6-3.0L Page 1213



DTC P0134, P0140, P0154, or P0160 (LF1)



Diagnostic Instructions



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System



Check - Vehicle) prior to using this diagnostic procedure.



* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an



overview of the diagnostic approach.



* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure



Instructions) provides an overview of each diagnostic category.



DTC Descriptors



DTC P0134



- HO2S Circuit Insufficient Activity Bank 1 Sensor 1



DTC P0140



- HO2S Circuit Insufficient Activity Bank 1 Sensor 2



DTC P0154



- HO2S Circuit Insufficient Activity Bank 2 Sensor 1



DTC P0160



- HO2S Circuit Insufficient Activity Bank 2 Sensor 2



Diagnostic Fault Information



Typical Scan Tool Data



Circuit/System Description



The heated oxygen sensors (HO2S) are used for fuel control and catalyst monitoring. Each HO2S compares the oxygen content of the surrounding



air with the oxygen content of the exhaust stream. When the engine is started, the control module operates in an Open Loop mode, ignoring the



HO2S signal voltage while calculating the air-to-fuel ratio. While the engine runs, the HO2S heats up and begins to generate a voltage within a

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