2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1858

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1858

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

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. Start the engine. Observe the DTC information with a scan tool. DTCs P2227, P2228, or P2229 should not set.

2. 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. Inspect the atmospheric vent on the K20 ECM case for one of the following conditions:

* Moisture in the vent inlet

* Debris in the vent inlet

瀚慖f a condition exists, attempt to clean or dry the atmospheric inlet.

2. Start the engine. Observe the DTC information with a scan tool. DTCs P2227, P2228, or P2229 should not set.

瀚慖f DTC P2227, P2228, or P2229 sets, replace the K20 ECM.

Repair Instructions

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

Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming

P2229

DTC P2227, P2228, or P2229 (LAU)

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 P2227

- Barometric Pressure (BARO) Sensor Performance

DTC P2228

- Barometric Pressure (BARO) Sensor Circuit Low Voltage

DTC P2229

- Barometric Pressure (BARO) Sensor Circuit High Voltage

Circuit/System Description

The barometric pressure (BARO) sensor responds to changes in altitude and atmospheric conditions. This gives the engine control module (ECM)

an indication of barometric pressure. The ECM uses this information to calculate fuel delivery. The BARO sensor is located within the controller

and is not serviced as a separate unit. The BARO sensor provides a voltage signal to the ECM relative to the atmospheric pressure changes. The

ECM monitors the BARO sensor signal for a voltage outside of the normal range.

Conditions for Running the DTC