• 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

For an overview of the component/system, refer to:Compressor Air Intake Turbocharger System Description

• DTC P0102, P0103, P0107, P0108, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0128, P0237, P0238, P0335, P0336, P2227, P2228, P2229, P2230 = Not set
• DTC P0112, P0113, P0117, or P0118Not pending
• Engine Coolant Temperature=−9 to 130°C (16 to 266°F)
• Engine Speed400 to 6000 RPM
• Intake Air Temperature (IAT) Sensor CircuitIf between -20 and 125°C (-4 and 257°F)

Frequency the DTC runs=Continuously—After the running conditions are met

Ignition=OnorEngine Running

Frequency the DTC runs=Continuously—After the running conditions are met

Signal Stuck In Rangeor¿Calculated Air Flow

Boost Pressure Sensor=Less than 0.9 V—For greater than 5 s

Boost Pressure Sensor=Greater than 3.9 V—For greater than 5 s

DTCs listed in the DTC Descriptor category=Type A DTC

• Engine=Reduced Engine Power
• Warning Message=Reduced Engine Power

DTCs listed in the DTC Descriptor category=Type A DTC

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 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. If you were sent here from DTC P00C7, P0068, P0101, P0106, P0121, P1101 » Refer to: Circuit/System Testing.
4. Verify the scan tool parameter:Throttle Body Idle Air Flow CompensationLess than 90%
• If greater than 90%

  Refer to:Throttle Body Cleaning

• If less than 90%
5. Perform the scan tool control function:Throttle Sweep»Start

   Verify the scan tool parameter:Throttle Position Sensors 1 and 2=Agree

• If not the specified state

  Refer to:DTC P0121-P0123, P0222, P0223, P16A0-P16A2, or P2135

• If the specified state
6. Verify the scan tool parameter:BARO Sensor=The value should be within the range listed in the table:Altitude Versus Barometric Pressure
• If not in the specified range

  Refer to:DTC P2227-P2230

• If in the specified range
7. Verify the following parameter is within 3 kPa (.4 PSI) of the actual barometric pressure:MAP Sensor
• If not in the specified range

  Refer to:DTC P0106, P0107, or P0108

• If in the specified range
8. Engine » Idling — At normal operating temperature
9. Verify the scan tool parameter:MAP Sensor=26 to 52 kPa (3.8 to 7.5 PSI)—The value should change with accelerator pedal input.
• If not in the specified range or does not change

  Refer to:DTC P0106, P0107, or P0108

• If in the specified range and changes
10. Observe the scan tool parameter:MAF Sensor&Engine Speed
11. Increase the engine speed slowly to 3,000 RPM and then back to idle.
12. Verify the scan tool parameter:MAF Sensor=The value should change smoothly and gradually as the engine speed is increased and decreased.
• If the value does not change smoothly and gradually

  Refer to:DTC P0101

• If the value changes smoothly and gradually
13. Verify the following parameter is within 3 kPa (.4 PSI) of the actual barometric pressure:Boost Pressure Sensor
• If not in the specified range

  Refer to: Circuit/System Testing

• If in the specified range
14. Verify the following parameters are within 20 kPa (2.9 PSI) of each other:»1-2 Shift Time@Wide Open Throttle
• MAP Sensor
• Boost Pressure Sensor
• If not within 20 kPa (2.9 PSI) of each other

  Refer to: Circuit/System Testing

• If within 20 kPa (2.9 PSI) of each other
15. 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.

    Verify the DTC does not set.

• If the DTC sets

  Refer to: Circuit/System Testing

• If the DTC is not set
16. All OK.

1. Verify the following conditions do not exist:
• B74 Manifold Absolute Pressure Sensor—Leaking@O-Ring—Missing/Visible Damage
• B75C Multifunction Intake Air Sensor—Contamination of the measuring element/Cracked/Loose Clamps/Visible Damage/Water intrusion
• B111B Turbocharger Boost/Intake Air Temperature Sensor
• Leaking@O-Ring—Missing/Visible Damage
• Restricted—Moisture/Ice
• Skewed
• Q38 Throttle Body
• Coking/Loose Clamps/Visible Damage
• Restricted—Moisture/Ice
• Air Cleaner Element—Dirty/Restricted
• Catalytic Converter—Blocked/Restricted/Visible Damage
• Charge Air Cooler
• Leaking/Incorrect connection
• Restricted—Moisture/Ice
• Engine—Mechanical Condition»Refer to:Symptoms - Engine Mechanical
• Exhaust System—Leaking/Restricted/Visible Damage»Refer to:Symptoms - Engine Exhaust
• Intake Air Duct—Cracked/Loose Clamps/Restricted/Visible Damage
• Intake Manifold—Cracked/Loose Clamps/Restricted/Vacuum leak/Visible Damage
• Linkage@Turbocharger Wastegate Actuator—Binding or Sticking/Loose/Visible Damage
• Positive Crankcase Ventilation System
• Leaking@O-Ring—Missing/Visible Damage
• Restricted—Moisture/Ice
• Incorrect connection/Leaking/Restricted
• Vacuum Hoses—Kinked/Leaking/Incorrect connection/Restricted
• Vacuum leak@Engine—Oil Level Indicator and Tube/Oil Filler Cap
• If a condition exists

  Repair as necessary

• If no conditions exist

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.

2. Ignition/Vehicle & All vehicle systems » Off
3. Disconnect the electrical connector:B111B Turbocharger Boost/Intake Air Temperature SensorIt 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.
4. Test for less than 5 Ω between the test points:Low Reference circuit terminal 1&Ground
• If 5 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 1@Component harness&The other end of the circuit
• 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 5 Ω
5. Ignition » On / Vehicle » In Service Mode
6. Test for 4.8 to 5.2 V between the test points:5 V Reference circuit terminal 3&Ground
• 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 3@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 3@Component harness&The other end of the circuit
• 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 3@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
7. Verify the scan tool parameter:Boost Pressure Sensor=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
8. Connect a 3 A fused jumper wire between the test points:Signal circuit terminal 4&Low Reference circuit terminal 1
9. Verify the scan tool parameter:Boost Pressure Sensor=Less than 0.2 V
• If 0.2 V or greater
1. Ignition/Vehicle » Off & Remove » Jumper wire(s)
2. Disconnect the 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
• 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
10. Test or replace the component:B111B Turbocharger Boost/Intake Air Temperature Sensor

Note: Circuit/System Testing must be performed before proceeding with Component Testing.

1. Ignition/Vehicle » Off
2. Remove the component:B111B Turbocharger Boost/Intake Air Temperature Sensor—Leave the electrical connector connected.
3. Install»EN-23738-A - Vacuum Pump@B111B Turbocharger Boost/Intake Air Temperature Sensor
4. Use the tool to achieve a gauge reading between −13 and −21 kPa (−0.13 and −0.21 bar, <p05> and <p06> in Hg).

   Verify the scan tool parameter:Boost Pressure Sensor=Decreases between 13 and 21 kPa (1.9 and 3.0 PSI)

• If the parameter does not decrease between 13 and 21 kPa (1.9 and 3.0 PSI)

  Replace the component:B111B Turbocharger Boost/Intake Air Temperature Sensor

• If the parameter decreases between 13 and 21 kPa (1.9 and 3.0 PSI)
5. Use the tool to achieve a gauge reading between −30 and −38 kPa (−0.3 and −0.38 bar, <p05> and <p06> in Hg).

   Verify the scan tool parameter:Boost Pressure Sensor=Decreases between 30 and 38 kPa (4.4 and 5.5 PSI)

• If the parameter does not decrease between 30 and 38 kPa (4.4 and 5.5 PSI)

  Replace the component:B111B Turbocharger Boost/Intake Air Temperature Sensor

• If the parameter decreases between 30 and 38 kPa (4.4 and 5.5 PSI)
6. All OK.

1. Ignition/Vehicle » Off
2. Remove the component:B111B Turbocharger Boost/Intake Air Temperature Sensor
3. Connect a 3 A fused jumper wire between the test points:5 V Reference terminal 3&5 V
4. Connect a jumper wire between the test points:Low Reference terminal 1&Ground
5. Connect a DMM between the test points:Signal terminal 4@B111B Turbocharger Boost/Intake Air Temperature Sensor&Ground
6. Install»EN-23738-A - Vacuum Pump@B111B Turbocharger Boost/Intake Air Temperature Sensor
7. Use the tool to achieve a gauge reading between 0 and −15 kPa (0 and −0.15 bar, <p05> and <p06> in Hg).

   Verify the DMM displays between 0.2 and 4.9 V—The value should not spike or drop out.

• If not between 0.2 and 4.9 V or the value spikes/drops out

  Replace the component:B111B Turbocharger Boost/Intake Air Temperature Sensor

• If between 0.2 and 4.9 V and the value does not spike/drop out
8. All OK.

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

• Intake Air Pressure and Temperature Sensor Replacement—B111B Turbocharger Boost/Intake Air Temperature Sensor
• For control module replacement, programming, and setup refer to:Control Module References