Diagnostic Instructions
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
Typical Scan Tool Data
Parameter Normal Range:
At ignition ON, or with the engine running: 60-105 kPa, depending on altitude. Refer to
Altitude Versus Barometric Pressure
.
Circuit Description
The barometric pressure (BARO) sensor is integrated within the engine control module (ECM). The BARO sensor voltage signal is converted by the ECM for display on the scan tool as the BARO Sensor kPa parameter. The BARO sensor signal varies, according to
changes in altitude and atmospheric conditions. This gives the ECM an indication of the current barometric pressure. The ECM uses this information for numerous internal calculations. The ECM monitors the BARO sensor signal for voltages/pressures that are not
within a normal range. The ECM also monitors the stability of the BARO sensor signal by comparing successive samples.
Conditions for Running the DTC
P2227 - Engine Cranking
| • | DTCs P0121, P0122, P0123, P0221, P0222, P0223, P0335, P0336, P2176, P2228, P2229 are not set. |
| • | The engine is cranking. |
| • | The engine OFF timer is greater than 4 seconds before cranking begins. |
| • | This DTC runs once per ignition cycle within the enabling conditions. |
P2227 - Engine Running Rationality Test
| • | DTCs P0121, P0122, P0123, P0221, P0222, P0223, P0335, P0336, P2176, P2228, P2229 are not set. |
| • | The engine speed is less than 1000 RPM. |
| • | The TP Sensor parameter is less than 24 percent. |
| • | The engine has been running for greater than 5 seconds. |
| • | This DTC runs continuously within the enabling conditions. |
P2227 - Engine Running Range Test
| • | DTCs P0121, P0122, P0123, P0221, P0222, P0223, P0335, P0336, P2176, P2228, P2229 are not set. |
| • | The engine has been running for greater than 5 seconds. |
| • | This DTC runs continuously within the enabling conditions. |
P2228
| • | The ignition is ON or the engine is running. |
| • | This DTC runs continuously within the enabling conditions. |
P2229
| • | The ignition is ON or the engine is running. |
| • | This DTC runs continuously within the enabling conditions. |
Conditions for Setting the DTC
P2227 - Engine Cranking
The ECM detects, when the engine is cranking, that the BARO sensor signal plus a calibrated threshold is not within range of a model derived from the BARO sensor, the MAP sensor, and the boost pressure sensor for more than 2 seconds.
P2227 - Engine Running Rationality Test
| • | The ECM detects, when the engine is running, that the BARO sensor signal has increased or decreased by greater than 10 kPa from the previous ignition OFF, and the BARO sensor is not within a calibrated range of the boost pressure sensor for
greater than 4 seconds continuously or 50 seconds cumulative. |
| • | The ECM detects, when the engine is running, that the BARO sensor signal has increased or decreased by greater than 5 kPa within 20 seconds, and the BARO sensor is not within a calibrated range of the boost pressure sensor for greater
than 4 seconds continuously or 50 seconds cumulative. |
P2227 - Engine Running Range Test
The ECM detects, when the engine is running, that the BARO sensor signal is less than or greater than a calibrated threshold for more than 4 seconds continuously or 50 seconds cumulative.
P2228
The ECM detects that the BARO sensor voltage signal is less than 0.2 volt for greater than 4 seconds continuously or 50 seconds cumulative.
P2229
The ECM detects that the BARO sensor voltage signal is greater than 4.87 volts for greater than 4 seconds continuously or 50 seconds cumulative.
Action Taken When the DTC Sets
DTCs P2227, P2228, P2229 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P2227, P2228, P2229 are Type B DTCs.
Reference Information
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Circuit/System Testing
Because the BARO sensor is contained within the ECM, circuit testing is not possible. If any of the above DTCs are set and cannot be cleared then replace the ECM.
Component Testing
Because the BARO sensor is contained within the ECM, component testing is not possible. If any of the above DTCs are set and cannot be cleared then replace the ECM.
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
Control Module References
for ECM replacement, setup, and programming
