Sunday, October 3, 2021

2010 Cadillac Truck SRX AWD V6-3.0L Page 1938

2010 Cadillac Truck SRX AWD V6-3.0L Page 1938



Repair Instructions



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



P2097



DTC P2097



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 Descriptor



DTC P2097



- Post Catalyst Fuel Trim System High Limit



Circuit Description



Fuel trim bias is used by the engine control module (ECM) to keep the post catalyst HO2S voltage within a range of 580-665 mV. This allows



optimal catalyst efficiency under light load conditions, such as at idle or a steady cruise. The ECM constantly monitors how lean or rich the fuel



trim bias is commanded, to determine if the fuel trim bias is greater than a calibrated amount.



Conditions for Running the DTC



* Before the ECM can report DTC P2097 failed, DTCs P0030, P0031, P0032, P0130, P0131, P0132, P0133, P0135, P0137, P0138, P2232,



P2235, P2270, P2271, P2272, and P2273 must run and pass.



* DTC P0100, P0101, P0102, P0103, P0111, P0112, P0113, P0116, P0117, P0118, P0119, P0420, P0443, P0458, or P0459 is not set.



* The engine speed is 1,080-3,480 RPM.



* The engine load is 17-20 % and steady.



* The Closed Loop fuel control is active for greater than 1 s.



* The front and rear HO2S are in Closed Loop.



* The calculated exhaust gas temperature is greater than 250掳C (482掳F).



* DTC P2097 runs continuously when the conditions above have been met for greater than 200 s.



Conditions for Setting the DTC



The rich correction limit for a condition causing a lean air/fuel mixture has been exceeded for a predetermined amount of time. The condition exists



for greater than 4 s or for a cumulative of 30 s.



Action Taken when the DTC Sets



DTC P2097 is a Type B DTC.



Conditions for Clearing the MIL/DTC



DTC P2097 is a Type B DTC.



Diagnostic Aids



* An HO2S will not cause this DTC to set without the occurrence of circuit related HO2S DTCs. Do not replace an HO2S to address this DTC.



* An exhaust system leak that may not be audible can set this DTC.



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

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