DTC P2227-P2229 or P2230 (LF1, LFW)
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DTC P2227-P2229 or P2230 (LF1, LFW)
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DTC P2227
Barometric Pressure (BARO) Sensor Performance
DTC P2228
Barometric Pressure (BARO) Sensor Circuit Low Voltage
DTC P2229
Barometric Pressure (BARO) Sensor Circuit High Voltage
DTC P2230
Barometric Pressure (BARO) Sensor Circuit Erratic
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Diagnostic Fault Information
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Circuit
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Short to Ground
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Open/High Resistance
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Short to Voltage
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Signal Performance
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5 V Reference
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P0641, P2227, P2228
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P2228
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P0641, P2229
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P2227
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Signal
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P2227, P2228
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P2227, P2228
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P2227, P2229
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P2227
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Low Reference
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-
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P2227, P2229
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-
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P2227
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BARO
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Circuit
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Short to Ground
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Open
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Short to Voltage
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Operating Conditions:
Ignition ON, Engine OFF
Parameter Normal Range:
56-105 kPa (8.1-15.2 psi), varies with altitude
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5 V Reference
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0 kPa (0 psi)
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0 kPa (0 psi)
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127 kPa (18.4 psi)
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Signal
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0 kPa (0 psi)
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0 kPa (0 psi)
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127 kPa (18.4 psi)
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Low Reference
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-
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127 kPa (18.4 psi)
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-
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Circuit/System Description
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The barometric pressure (BARO) sensor is integral to the throttle inlet absolute pressure sensor and responds to changes in altitude and atmospheric conditions. This gives the ECM an indication of barometric pressure. The ECM uses this information to calculate fuel delivery. The BARO sensor provides a voltage signal to the ECM relative to the atmospheric pressure changes. The ECM monitors the BARO sensor signal for a voltage outside of the normal range.
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Conditions for Running the DTC
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P2227
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DTC P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0222, P0223, P1516, P2135, P2228, or P2229 is not set.
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DTC P0106, P0107, P0108, P2228, P2229, or P2230 is not set and not pending.
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Ignition ON, engine OFF
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DTC P2227 runs continuously when the above conditions are met.
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P2228 or P2229
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The DTCs run continuously when the above condition is met .
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P2230
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DTC P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0222, P0223, P1516, P2135, P2228, or P2229 is not set.
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DTC P2230 runs continuously when the above conditions are met.
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Conditions for Setting the DTC
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P2227
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The ECM detects that the difference between the BARO signal and the calculated BARO is greater than 15 kPa (2.2 psi) if the vehicle has traveled at most 0.5 km (0.31 mi) since the last calculated BARO update, or the ECM detects that the difference between the BARO signal and the calculated BARO is greater than 25 kPa (3.6 psi) if the vehicle has traveled greater than 0.5 km (0.31 mi) since the last calculated BARO update.
OR
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Ignition ON, engine OFF
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The ECM detects that the BARO pressure is less than 50 kPa (7.3 psi) or greater than 115 kPa (16.7 psi).
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P2228
The ECM detects that the BARO sensor voltage is less than 1.95 V for greater than 4 s.
P2229
The ECM detects that the BARO sensor voltage is greater than 4.5 V for greater than 4 s.
P2230
The ECM detects that the difference between the current BARO sensor reading and the previous BARO sensor reading is greater than 10 kPa (1.5 psi).
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Action Taken When the DTC Sets
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DTCs P2227, P2228, P2229, and P2230 are Type B DTCs.
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Conditions for Clearing the MIL/DTC
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DTCs P2227, P2228, P2229, and P2230 are Type B DTCs.
Inspect the inlet port on the BARO sensor for moisture or debris and attempt to dry or clean the inlet, if contaminated.
Schematic Reference
Engine Controls Schematics (3.0L (LF1))
Engine Controls Schematics (2.8L (LAU))
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
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Circuit/System Verification
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1.
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Ignition ON, observe the DTC information with a scan tool. Verify that DTC P0641 is not set.
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3.
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Ignition ON, check the BARO-parameters. Compare the parameter to the table
Altitude versus barometric pressure
. The BARO-parameter should be within the specified range indicated in the table.
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4.
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Engine on, check the DTC information with a scan tool. DTCs P2227, P2228, P2229, or P2230 should not be generated.
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5.
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Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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1.
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Ignition OFF, disconnect the harness connector at the B17 BARO sensor.
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2.
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Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 Ω between the low reference circuit terminal 2 and ground.
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3.
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If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.
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4.
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Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground.
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5.
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If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
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6.
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If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
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7.
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Verify the scan tool BARO parameter is less than 1 kPa (0.2 psi).
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8.
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If greater than the specified range, test the signal circuit's pin 3 for a short to voltage. If the circuit tests normal, replace the K20 ECM.
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9.
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Install a 3 A fused jumper wire between the signal circuit terminal 3 and the 5 V reference circuit terminal 1. Verify the scan tool BARO parameter is greater than 127 kPa (18.4 psi).
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10.
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If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
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11.
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If the circuits test normal, replace the B17 BARO sensor.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
