• Perform the Diagnostic System Check prior to using this diagnostic procedure:Diagnostic System Check - Vehicle
• Review the description of Strategy Based Diagnosis:Strategy Based Diagnosis
• An overview of each diagnostic category can be found here:Diagnostic Procedure Instructions

The barometric pressure sensor is integrated into the multifunction intake air sensor.

• DTC P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0117, P0118, P0119, P0121, P0122, P0123, P0222, P0223, P0236, P0237, P0238, P1516, P2101, P2135, P2228, P2229 = Not set
• Engine Running=For greater than 30 s

• DTC P0106, P0107, P0108, P0237, P0238, P2228, P2229, P2230, P2610 = Not set
• Ignition=On
• Engine Off=For greater than 6 min

DTC runs continuously when the above conditions are met.

Engine Running=For greater than 30 s

DTC runs continuously when the above condition is met.

• DTC P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0117, P0118, P0119, P0121, P0122, P0123, P0222, P0223, P0236, P0237, P0238, P1516, P2101, P2135, P2228, P2229 = Not set
• Ignition=On

DTC runs continuously when the above conditions are met.

BARO&Calculated BARO=The actual value is not within a predetermined range of the calculated value

BARO=Less than 50 kPa (7.3 PSI)orGreater than 115 kPa (16.7 PSI)

BARO=Less than 2 V—For greater than 5 s

BARO=Greater than 4.5 V—For greater than 5 s

BARO=Signal noisy or erratic—For greater than 5 s

DTCs P2227, P2228, P2229, P2230 are Type B DTCs.

DTCs P2227, P2228, P2229, P2230 are Type B DTCs.

Engine Controls Schematics

Master Electrical Component List

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Control Module References

1. Ignition » On / Vehicle » In Service Mode
2. Verify DTC P0106, P0107, P0108, P0641, P0651, P0697, P06A3, P06D2 is not set
• If any of the DTCs are set

  Refer to:Diagnostic Trouble Code (DTC) List - Vehicle

• If none of the DTCs are set
3. Determine the current vehicle testing altitude.
4. Verify the scan tool parameter:
• MAP Sensor=Altitude Versus Barometric Pressure—The value should be within the range listed in the table.
• Boost Pressure=Altitude Versus Barometric Pressure—The value should be within the range listed in the table.
• BARO=Altitude Versus Barometric Pressure—The value should be within the range listed in the table.
• If not in the specified range
• {MAP Sensor}Refer to:DTC P0106, P0107, or P0108.
• {Boost Pressure}Refer to:DTC P0236, P0237, or P0238.
• {BARO}Refer to: Circuit/System Testing.
• If in the specified range
5. Verify the scan tool parameter:BARO=The value should not spike or drop out.

   Perform the action while monitoring the parameter:

• Wiggle the harness and connector(s):B75C Multifunction Intake Air Sensor
• Wiggle the harness and connector(s):@K20 Engine Control Module
• If the value spikes or drops out

  Repair as necessary » Wiring / Terminal(s) / Electrical Connector(s)

• If the value does not spike or drop out
6. 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 data.
7. Verify the DTC does not set.
• If the DTC sets

  Refer to: Circuit/System Testing

• If the DTC is not set
8. All OK.

Note: It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

1. Ignition/Vehicle & All vehicle systems » Off
2. Disconnect the electrical connector:B75C Multifunction Intake Air Sensor
3. Test for less than 10 Ω between the test points:Low Reference circuit terminal 3&Ground
• If 10 Ω or greater
1. Disconnect the appropriate electrical connector:@K20 Engine Control Module
2. Test for less than 2 Ω between the test points:Low Reference circuit terminal 3@Component harness&The other end of the circuit@Control module harness
• If 2 Ω or greater » Repair the open/high resistance in the circuit.
• If less than 2 Ω » Replace the component:K20 Engine Control Module
• If less than 10 Ω
4. Ignition » On / Vehicle » In Service Mode
5. Test for 4.8 to 5.2 V between the test points:5 V Reference circuit terminal 2&Low Reference circuit terminal 3
• If less than 4.8 V
1. Ignition/Vehicle » Off
2. Disconnect the appropriate electrical connector:@K20 Engine Control Module
3. Test for infinite resistance between the test points:5 V Reference circuit terminal 2@Component harness&Ground
• If less than infinite resistance » Repair the short to ground on the circuit.
• If infinite resistance
4. Test for less than 2 Ω between the test points:5 V Reference circuit terminal 2@Component harness&The other end of the circuit@Control module harness
• If 2 Ω or greater » Repair the open/high resistance in the circuit.
• If less than 2 Ω » Replace the component:K20 Engine Control Module
• If greater than 5.2 V
1. Ignition/Vehicle » Off
2. Disconnect the appropriate electrical connector:@K20 Engine Control Module
3. Ignition » On / Vehicle » In Service Mode
4. Test for less than 1 V between the test points:5 V Reference circuit terminal 2@Component harness&Ground
• If 1 V or greater » Repair the short to voltage on the circuit.
• If less than 1 V » Replace the component:K20 Engine Control Module
• If between 4.8 and 5.2 V
6. Verify the scan tool parameter:BARO=Greater than 4.7 V
• If 4.7 V or less
1. Ignition/Vehicle » Off
2. Disconnect the appropriate electrical connector:@K20 Engine Control Module
3. Test for infinite resistance between the test points:Signal circuit terminal 4@Component harness&Ground
• If less than infinite resistance » Repair the short to ground on the circuit.
• If infinite resistance » Replace the component:K20 Engine Control Module
• If greater than 4.7 V
7. Connect a 3 A fused jumper wire between the test points:Signal circuit terminal 4&Low Reference circuit terminal 3
8. Verify the scan tool parameter:BARO=Less than 0.2 V
• If 0.2 V or greater
1. Ignition/Vehicle » Off & Remove » Jumper wire(s)
2. Disconnect the appropriate electrical connector:@K20 Engine Control Module
3. Ignition » On / Vehicle » In Service Mode
4. Test for less than 1 V between the test points:Signal circuit terminal 4@Component harness&Ground
• If 1 V or greater » Repair the short to voltage on the circuit.
• If less than 1 V
5. Ignition/Vehicle » Off
6. Test for less than 2 Ω between the test points:Signal circuit terminal 4@Component harness&The other end of the circuit@Control module harness
• If 2 Ω or greater » Repair the open/high resistance in the circuit.
• If less than 2 Ω » Replace the component:K20 Engine Control Module
• If less than 0.2 V
9. Test or replace the component:B75C Multifunction Intake Air Sensor

Perform the Diagnostic Repair Verification after completing the repair:Diagnostic Repair Verification

• Mass Airflow Sensor Replacement—B75C Multifunction Intake Air Sensor
• For control module replacement, programming, and setup refer to:Control Module References