2010 Cadillac Truck SRX FWD V6-3.0L Page 1938

2010 Cadillac Truck SRX FWD 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