2010 Cadillac Truck SRX AWD V6-3.0L Page 2034

2010 Cadillac Truck SRX AWD V6-3.0L Page 2034

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

* DTCs P0036, P0037, P0038, P0137, P0138, P0140, P0141, P0443, P0458, P0459, P2232 are not set.

* The ignition voltage is between 10-32 V.

* The engine speed is between 1,225-2,100 RPM.

* The mass air flow (MAF) is between 4-13 g/s.

* The vehicle speed is between 64-125 km/h (40-78 mph).

* The fuel level is greater than 10 %.

* The fuel system is in Closed Loop.

* The predicted catalytic converter temperature is between 615-980掳C (1,139-1,796掳F).

* The HO2S is ON for more than 180 s.

* The DTCs run once per ignition cycle when the above conditions are met.

Conditions for Setting the DTC

P2270

The ECM does not detect a HO2S voltage greater than 800 mV before accumulated mass air flow exceeds 62 grams.

P2272

The ECM does not detect a HO2S voltage greater than 800 mV before the accumulated mass air flow exceeds 62 grams.

Action Taken When the DTC Sets

DTCs P2270 and P2272 are Type B DTCs.

Conditions for Clearing the DTC

DTCs P2270 and P2272 are Type B DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics (LAU) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics

(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)