Diagnostic Instructions
DTC Descriptor
DTC P2227: Barometric Pressure (BARO) Sensor Performance
Circuit/System Description
The barometric pressure (BARO) sensor is installed inside of the engine control module (ECM) and converts the BARO into a voltage signal. The ECM uses this voltage signal to calibrate the fuel injection quantity and injection timing for altitude compensation.
Within the ECM, the diagnostic compares the BARO sensor input to the boost pressure sensor input.
Conditions for Running the DTC
| • | DTCs P0079, P0080, P0102, P0103, P0117, P0118, P0126, P0237, P0238, P02E8, P02E9, P0500, P0506, P0507, P0602, P0642, P0643, P1125 and P268A are not set. |
| • | The following conditions are met for longer than 3 seconds: |
| - | The battery voltage is between 10-16 volts. |
| - | The ignition switch is ON for longer than 2 seconds. |
| - | The engine speed is between 500-800 RPM. |
| - | The vehicle speed is less than 2 mph. |
| - | The engine coolant temperature is more than 20°C (68°F). |
| - | The engine run time is longer than 30 seconds. |
| - | The accelerator pedal position is less than 2 percent. |
| - | The MAF volume is between 800-1600 mg/cyl. |
| - | The exhaust brake switch is OFF. |
| • | The following conditions are met for longer than 10 seconds: |
| - | The intake throttle position is less than 55 percent. |
| - | The DPF status is Not during regeneration. |
| - | The exhaust brake control is commanded OFF. |
| - | The VNT control mode is Normal. |
| - | The differential pressure is between -10 and +20 kPa |
| - | The above conditions are met for 3 seconds. |
Conditions for Setting the DTC
The ECM detects that the difference between the BARO pressure and the boost pressure is more than 7.5 kPa for longer than 5 seconds.
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.
Diagnostic Aids
An incorrectly installed turbocharger boost sensor will cause this DTC to set.
Reference Information
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
Important:
| • | If DTCs P0079, P0080, P0102, P0103, P0117, P0118, P0126, P0237, P0238, P02E8, P02E9, P0500, P0506, P0507, P0602, P0642, P0643, P1125 and P268A are not set, test and repair those DTCs first. |
| • | Perform Circuit/System Verification before proceeding with Circuit/System Testing. |
- Test the voltage and ground circuits to the ECM for a short, an open, or high resistance.
- Turn ON the ignition, with the engine OFF.
- Observe the BARO parameter with a scan tool.
- Compare the BARO parameter to the range specified in the altitude vs. barometric pressure table. Refer to
Altitude Versus Barometric Pressure .
| ⇒ | If the BARO parameter is outside the range specified, replace the ECM. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for ECM replacement, setup, and programming
