P2227
DTC P2227
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptor
DTC P2227
- Barometric Pressure (BARO) Sensor Performance
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The engine control module (ECM) supplies 5 V to the BARO sensor on a 5 V reference circuit, and provides a ground on a low reference circuit. The BARO sensor provides a voltage signal to the ECM on a signal circuit relative to the atmospheric pressure changes. Changes in BARO due to weather are relatively small, while changes due to altitude are significant. Pressure can range from 56 kPa at an altitude of 4,267 meters (14,000 feet), to 105 kPa at or below sea level. The BARO sensor has a range of 0-128 kPa.
Conditions for Running the DTC
* DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0125, P0128, P0220, P0222, P0223, P0502, P0503, P0722, P0723, P1516, P2101, P2135, P2228, P2229 are not set.
* The engine run time is greater than 30 s.
* The vehicle speed is less than 100 km/h (62 mph).
* DTC P2227 runs continuously when the above conditions are met.
Conditions for Setting the DTC
* The ECM detects the difference between the current BARO sensor reading and the previous BARO sensor reading is greater than 10 kPa.
* The above condition is met for 1 s.
Action Taken When the DTC Sets
DTC P2227 is a Type B DTC.
Conditions for Clearing the DTC
DTC P2227 is a Type B DTC.
Reference Information
Schematic Reference
Engine Controls Schematics (LZ1) [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Connector Views
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module References for scan tool information
Special Tools
* J-23738-A Mityvac
* J-35555 Metal Mityvac
Circuit/System Verification
1. Ignition OFF, open the hood to disable the Auto-Stop function. Refer to Hybrid Modes of Operation Description Hybrid Modes of Operation Description.
2. Ignition ON, verify the scan tool hood position parameter displays Open.
• If the hood position does not display Open, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle for DTC P254F.
3. Ignition ON, observe the scan tool MAP and BARO sensor parameters. The readings should be within 5 kPa, and within the range specified in the Altitude Versus Barometric Pressure Altitude Versus Barometric Pressure table for the current altitude.
4. 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 idling, move the related harnesses/connectors at the BARO sensor and at the ECM while observing the scan tool BARO sensor parameter. The scan tool BARO parameter should be steady.
• If the parameter does not perform as specified, repair the harness/connectors as necessary.
2. If all circuits test normal, test or replace the BARO sensor.
Component Testing
Note: You must perform the Circuit/System Testing before proceeding with the Component Test.
1. Ignition OFF, remove the BARO sensor.
2. Install a 3 A fused jumper wire between the 5 V reference terminal 1 and the corresponding terminal of the BARO sensor.
3. Install a jumper wire between the low reference terminal 2 of the BARO sensor and ground.
4. Install a jumper wire at terminal 3 of the BARO sensor.
5. Connect a DMM between the jumper wire from terminal 3 of the BARO sensor and ground.
6. Ignition ON, with the J-23738-A or J-35555 , slowly apply vacuum to the sensor while observing the voltage on the DMM. The voltage should vary between 0-5.2 V, without any spikes or dropouts.
• If the voltage reading is erratic, replace the BARO sensor.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Barometric Pressure Sensor Replacement Service and Repair
* Control Module References Control Module References for ECM replacement, setup, and programming