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 barometric pressure (BARO) sensor measures the pressure of the atmosphere. This pressure is affected by altitude and weather conditions. A diaphragm within the BARO sensor is displaced by the pressure changes that occur from varying altitudes and weather conditions. The sensor translates this diaphragm action into the voltage signal input that is used by the engine control module (ECM) for diagnostics, emissions control, and to calculate fuel delivery.
The ECM provides the BARO sensor with a 5 V reference circuit, a low reference circuit and a signal circuit. The BARO sensor provides a voltage signal to the ECM relative to barometric pressure changes.
Conditions for Running the DTC
* DTC P0068, P0101, P0102, P0103, P0111, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P012B, P012C, P012D, P0220, P0222, P0223, P1516, P2101, P2135, P2228, or P2229 is not set.
* The ignition is ON for greater than 10 s.
* The vehicle speed is greater than 100 km/h (62 mph).
Conditions for Setting the DTC
The ECM detects that the difference between the current BARO sensor reading and the previous BARO sensor reading is greater than 10 kPa for 5 s.
Action Taken When the DTC Sets
DTC P2227 is a Type B DTC.
Conditions for Clearing the MIL/DTC
DTC P2227 is a Type B DTC.
Reference Information
Schematic Reference
Engine Controls Schematics [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
Circuit/System Verification
1. Ignition ON, observe the scan tool MAP, SC Inlet Pressure, and BARO sensor parameters. The readings should be constant, within 5 kPa of each other and within the range specified in the Altitude Versus Barometric Pressure Altitude Versus Barometric Pressure table for the current testing altitude.
2. Operate the vehicle within the Conditions for Running the DTC to verify that 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 BARO sensor for the following conditions:
* Moisture or debris in the inlet port
* Damage
• If a condition is found, repair or replace the BARO sensor as necessary.
2. Engine running, monitor the BARO parameter with a scan tool. The parameter should remain constant and be within the range specified in the Altitude Versus Barometric Pressure Altitude Versus Barometric Pressure table.
• If not as specified, test or replace the BARO sensor.
Component Testing
Note: You must perform the Circuit/System Testing before proceeding with the Component Test.
1. Ignition ON, engine OFF, remove the BARO sensor.
2. Install a 3 A fused jumper wire between the 5 V reference terminal 1 of the sensor and 5 V reference.
3. Install a jumper wire between the low reference terminal 2 of the sensor and ground.
4. Connect a DMM between the BARO signal terminal 3 of the sensor and ground.
5. Slowly apply vacuum to the sensor with the J-23738-A while monitoring the voltage on the DMM. The voltage should vary between 5.2-0 V, without any spikes or dropouts.
• If the voltage is not within the specified range or 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