P2229

DTC P2229

DTC DESCRIPTORS

DTC P2228
Barometric Pressure (BARO) Sensor Circuit Low Voltage

DTC P2229
Barometric Pressure (BARO) Sensor Circuit High Voltage

DIAGNOSTIC FAULT INFORMATION






IMPORTANT:
- Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
- If DTC P0652 or P0653 are set, diagnose these first. Refer to DTC P0652 or P0653.

TYPICAL SCAN TOOL DATA

BARO Sensor:

CIRCUIT/SYSTEM DESCRIPTION
The barometric pressure (BARO) sensor measures the pressure of the atmosphere. This pressure is affected by altitude and weather conditions. A diaphragm within the BARO sensor is displaced by the pressure changes that occur from varying altitudes and weather conditions. The sensor translates this action into electrical resistance. The BARO sensor wiring includes 3 circuits. The BARO sensor and all related circuits are inside the engine control module (ECM). The BARO sensor provides a signal voltage to the ECM, relative to the pressure changes on the BARO sensor signal circuit. The ECM converts the signal voltage input to a pressure value. Changes in BARO due to weather are relatively small, while changes due to altitude are significant. Pressure can range from 56 kPa at an altitude of 4 267 meters (14,000 feet), to 105 kPa at or below sea level. The BARO sensor has a range of 8-207 kPa. The ECM uses the BARO sensor input for fuel delivery and other diagnostics.

CONDITIONS FOR RUNNING THE DTC
- DTC P0652 or P0653 are not set.
- The ignition is ON.
- DTC P2228 and P2229 run continuously when the above conditions are met.

CONDITIONS FOR SETTING THE DTC

P2228
The BARO is less than 60 kPa for 1 second.

P2229
The BARO is more than 120 kPa for 1 second.

ACTION TAKEN WHEN THE DTC SETS
- The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
- The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC
- The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
- A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
- Clear the MIL and the DTC with a scan tool.

CIRCUIT/SYSTEM VERIFICATION

IMPORTANT:
- If DTC P0652 or P0653 are set, diagnose those DTCs first. Refer to DTC P0652 or P0653.
- If you cannot duplicate the condition, operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.

1. Turn ON the ignition with the engine OFF.
2. Observe the BARO parameter with a scan tool.
3. Compare the BARO value to the range specified in the altitude vs. barometric pressure table.
- The BARO parameter should be within the range specified in the altitude vs. barometric pressure table.

CIRCUIT/SYSTEM TESTING
1. Turn ON the ignition, with the engine OFF.
2. Observe the BARO parameter with a scan tool.
3. Compare the BARO parameter to the range specified in the altitude vs. barometric pressure table.
- If the BARO parameter is outside the range specified, replace the ECM.

REPAIR INSTRUCTIONS

IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ECM replacement, setup, and programming