P2229

DTC P2229

Circuit Description
The barometric pressure (BARO) sensor is installed inside of the engine control module (ECM) and converts the barometric pressure (BARO) into a voltage signal. The ECM uses this voltage signal to calibrate the fuel injection quantity and injection timing for altitude compensation. If the ECM detects an excessively high BARO signal voltage, this DTC will set.

Condition for Running the DTC
- The ignition switch is ON.
- The battery voltage is between 10-16 volts.

Condition for Setting the DTC
- The ECM detects that the BARO signal voltage is more than 4.5 volts.

Action Taken When the DTC Sets
- The ECM illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
- The ECM records the operating conditions at the time the diagnostic fails. The ECM stores this information in the Failure Records.
- The ECM uses a barometric pressure substitution of 14.7 psi (101.3 kPa) when the DTC is set.
- The ECM uses a barometric pressure substitution of 10.5 psi (72.4 kPa) for engine starting and running.
- The ECM limits fuel injection quantity within 70%.
- The ECM closes the EGR valve and holds to close position.

Condition for Clearing the DTC
- A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
- Clear the MIL and the DTC with a scan tool.

DTC P2229

Schematic Reference: Engine Controls Schematics