P2227

P2227-BAROMETRIC PRESSURE CIRCUIT PERFORMANCE

For a complete wiring diagram refer to the Wiring Information Electrical Diagrams

The Powertrain Control Module (PCM) checks the barometric pressure sensor signal for 3 fault conditions. One trip fault. Three good trips to turn off the MIL:

Out of Working Range: The barometric pressure value is checked against a lower and upper limit.

- When Monitored:
The ignition is on.

- Set Condition:
The PCM checks if the barometric pressure signal is outside the sensors working range by comparing the barometric pressure signal with a maximum acceptable value and a minimum acceptable value.

Power-up Test: Barometric pressure is compared with manifold pressure.

- When Monitored:
Directly after turning the ignition on.

- Set Condition:
At PCM power-up the barometric pressure is compared with manifold pressure. If the two do not correlate and the barometric pressure has changed more than a certain amount during the engine off period, then this DTC can be reported.

High Rate of Change: The barometric pressure value is checked against a lower and upper limit.

- When Monitored:
The ignition is on.

- Set Condition:
The barometric pressure has changed more than a certain amount within a certain period of time.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.Pre-Diagnostic Troubleshooting Procedure
POWERTRAIN CONTROL MODULE (PCM)

NOTE: Diagnose and repair any Crank sensor circuit DTCs before continuing with this test.

NOTE: Since the barometric pressure sensor is located inside the PCM, if the PCM is warm and gets cooled down quickly, this can result in a pressure drop inside the PCM which can cause this DTC to set. The driver should be asked if the fault occurred after the vehicle went through a carwash or driven through water.

1. Look for any chafed, pierced, pinched, or partially broken wires.
2. Look for broken, bent, pushed out or corroded terminals.
3. Look for a restriction in the PCM breather.
4. Search for any Technical Service Bulletins that may apply.

Were any problems found?

Yes

- Repair as necessary.
- Perform the PCM Verification Test.PCM Verification Test

No

- Replace and program the Powertrain Control Module (PCM).
- Perform the PCM Verification Test.PCM Verification Test