2010 Cadillac CTS Sedan AWD V6-3.6L Page 1068

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2010 Cadillac CTS Sedan AWD V6-3.6L Page 1068



- HO2S Circuit Insufficient Activity Bank 1 Sensor 1



DTC P0154



- HO2S Circuit Insufficient Activity Bank 2 Sensor 1



Diagnostic Fault Information



Typical Scan Tool Data



Circuit 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. The control module supplies the HO2S with a reference, or bias voltage of about 450



mV. While the engine runs, the HO2S heats up and begins to generate a voltage within a range of 0-1,000 mV. This voltage will fluctuate above



and below the bias voltage. Once sufficient HO2S voltage fluctuation is observed by the control module, Closed Loop is entered. The control



module uses the HO2S voltage to determine the air-to-fuel ratio. An HO2S voltage that increases above bias voltage toward 1,000 mV indicates a



rich fuel mixture. An HO2S voltage that decreases below bias voltage toward 0 mV indicates a lean fuel mixture.



The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed



Loop earlier and the control module to calculate the air-to-fuel ratio sooner.



Conditions for Running the DTCs



Condition 1



* DTC P0201, P0202, P0203, P0204, P0205, P0206, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276,



P0277, P2146, P2149, P2152, P2155, P216A, or P216D is not set.



* The ignition voltage is greater than 10 volts.



* The engine speed is greater than 240 RPM.



* The HO2S 1 heater duty cycle is greater than 90 percent for more than 5 seconds.



* DTCs P0134 and P0154 run continuously once the conditions above exist for greater than 10 seconds.



Condition 2



* DTC P0201, P0202, P0203, P0204, P0205, P0206, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276,



P0277, P2146, P2149, P2152, P2155, P216A, or P216D is not set.



* The ignition voltage is greater than 10 volts.



* The engine speed is greater than 240 RPM.



* The HO2S 1 is warmed up for greater than 30 seconds.



* The HO2S 1 heater duty cycle is greater than 68 percent.



* DTCs P0134 and P0154 run continuously once the conditions above exist.



Condition 3



* DTC P0201, P0202, P0203, P0204, P0205, P0206, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276,



P0277, P2146, P2149, P2152, P2155, P216A, or P216D is not set.



* The ignition voltage is greater than 10 volts.



* The engine speed is greater than 240 RPM.



* The HO2S 1 is warmed up for greater than 30 seconds.



* The calculated exhaust temperature is warmer than 600掳C (1,112掳F).



* DTCs P0134 and P0154 run continuously once the conditions above exist.

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