2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1869

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1869

Conditions for Setting the DTC

The ECM detects that the rear HO2S voltage is less than 650 mV for greater than 100 s, then an intrusive test is performed. The ECM will enrich

the fuel mixture up to 30 % and then wait for 10 s at 30 %. The ECM detects that the HO2S voltage is less than 650 mV during the intrusive test for

greater than 4 s or for a cumulative of 30 s, the DTC sets.

Action Taken when the DTC Sets

DTC P2270 is a Type B DTC.

Conditions for Clearing the MIL/DTC

DTC P2270 is a Type B 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

* 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)

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

Repairs/Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

1. Ignition ON, observe the DTC information with a scan tool. Verify that DTC P0137, P0138, or P0140 is not set.

瀚慖f any of the listed DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code

Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle) for further diagnosis.

2. Operate the engine above 1,200 RPM for 30 s, observe the HO2S 2 voltage parameter. The reading should fluctuate above and below the

range of 350-550 mV.

3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the

conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

1. Engine operating, move the related HO2S harness between the B52 HO2S harness connector and the K20 engine control module (ECM)

while monitoring the HO2S 2 voltage parameter. Verify that the HO2S 2 parameter does not change abruptly while moving the related

harnesses.

瀚慖f the HO2S parameter does change abruptly while moving the related harnesses repair the circuit as necessary.

2. Ignition OFF, disconnect the harness connector at the B52 HO2S 2.

3. Ignition ON, verify that the HO2S 2 parameter is between 350-500 mV.

瀚慖f less than the specified range, test the signal circuit terminal 4 for a short to ground. If the circuit/connections test normal, replace the

K20 ECM.

4. Verify that none of the following conditions exist: