2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1785
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
range of 0-1,275 mV. 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 toward 1,000 mV indicates a rich fuel mixture. An HO2S
voltage that decreases 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 DTC
P0131, P0137, P0151, or P0157
* DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128,
P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516,
P2101, P2119, P2135, P2176 are not set.
* The engine is operating in Closed Loop.
* The Ignition 1 voltage is between 10-32 V.
* The fuel level is greater than 10 %.
* The throttle position (TP) is between 3-70 %.
* The DTCs run continuously when the above conditions are met for 2 s.
P0132, P0138, P0152, or P0158
* DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128,
P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516,
P2101, P2119, P2135, P2176 are not set.
* The engine is operating in Closed Loop.
* The Ignition 1 voltage is between 10-32 V.
* The fuel level is greater than 10 %.
* The throttle position (TP) is between 0-70 %.
* The DTCs run continuously when the above conditions are met for 2 s.
Conditions for Setting the DTC
P0131, P0137, P0151, or P0157
* The ECM detects that the HO2S voltage is less than 50 mV.
* The DTCs set within 100 s when the above condition is met.
P0132, P0138, P0152, or P0158
* The ECM detects that the HO2S voltage is greater than 1,050 mV.
* The DTCs set within 15 s when the above condition is met.
Action Taken When the DTC Sets
