Advanced Diagnostics

Advanced Diagnostics - DTC P2227: Barometric Pressure (BARO) Sensor Circuit Range/Performance Problem










General Description
This turbocharged engine is equipped with three absolute pressure sensors. Normal operating conditions:
(A) The barometric pressure (BARO) sensor value and the turbocharger boost sensor value are the same when there is no boost.
(B) The turbocharger boost sensor value and the manifold absolute pressure (MAP) sensor value are similar at high throttle openings (boost).

When two of the compared sensor values above differ by a specified value, a sensor abnormality is detected.
- (A) No boost condition: Either the BARO sensor or the turbocharger boost sensor is abnormal. (P1233)
- (B) Large throttle opening area (boost): Either the turbocharger boost sensor or the MAP sensor is abnormal. (P1234)
- When abnormal values are detected at both areas (A) and (B), turbocharger boost sensor abnormality is identified. (P0236)
- When the turbocharger boost sensor or the MAP sensor does not change a specified value, even when transitioning from (A) to (B) or from (B) to (A), a stuck sensor output value is detected (turbocharger boost sensor: P0236, MAP Sensor P1129).

Monitor Execution, Sequence, Duration, DTC Type, OBD Status






Enable Conditions






Malfunction Threshold
When malfunction of the negative pressure (no boost) area determination (P1233) is detected and the open throttle (boost) area determination (P1234) is detected as normal, a malfunction of the BARO sensor is detected.

Driving Pattern






1. Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on.
2. Let it idle for at least 5 seconds.
3. Drive the vehicle with the engine speed 1,750 rpm or more, and the throttle position 22° or more for at least 5 seconds.

- Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.

Diagnosis Details

Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC and the freeze data are stored.

Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the battery.