2010 Cadillac CTS Sedan AWD V6-3.6L Page 1839
P2098
DTC P2096 or P2098
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 Descriptors
DTC P2096
- Post Catalyst Fuel Trim System Low Limit Bank 1
DTC P2098
- Post Catalyst Fuel Trim System Low Limit Bank 2
Circuit Description
Fuel trim bias is used to keep the post catalyst air/fuel ratio within a predetermined range. This allows optimal catalyst efficiency under light load
conditions at a steady cruise. The engine control module (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 P2096 or P2098 failed, DTCs P0030, P0031, P0032, P0036, P0037, P0038, P0050, P0051, P0052, P0056,
P0057, P0058, P013A, P013C, P013E, P0130, P0131, P0132, P0133, P0135, P0137, P0138, P014A, P0140, P0141, P0150, P0151, P0152,
P0153, P0155, P0157, P0158, P0160, P0161, P2232, P2235, P2270, P2271, P2272, and P2273 must run and pass.
* DTC P0100, P0101, P0102, P0103, P0420, P0430, P0442, P0443, P0455, P0458, P0459, P2177, P2178, P2179, P2180, P2187, P2188,
P2189 or P2190 is not set.
* The engine speed is 1,280-3,480 RPM.
* The engine load is 17-65 percent and steady.
* The closed loop fuel control is active for greater than 1 second.
* The calculated exhaust gas temperature is greater than 250掳C (482掳F).
* DTC P2096 and P2098 run continuously when the conditions above have been met for greater than 130 seconds.
Conditions for Setting the DTC
The lean correction limit for a condition causing a rich air/fuel ratio has been exceeded for greater than 4 seconds or for a cumulative of 30 seconds.
Action Taken when the DTC Sets
DTCs P2096 and P2098 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P2096 and P2098 are Type B DTCs.
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.
Reference Information
Schematic Reference
Engine Controls Schematics (LLT) (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)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)
