P0106
DTC P0106
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptor
DTC P0106
- Manifold Absolute Pressure (MAP) Sensor Performance
Diagnostic Fault Information
Typical Scan Tool Data
Circuit Description
The manifold absolute pressure (MAP) sensor measures the pressure inside the intake manifold. Pressure in the intake manifold is affected by engine speed, throttle opening, air temperature, turbocharger output, and barometric pressure (BARO). A diaphragm within the MAP sensor is displaced by the pressure changes that occur from the varying load and operating conditions of the engine. The sensor translates this action into electrical resistance. The MAP sensor wiring includes 3 circuits. The engine control module (ECM) supplies a regulated 5 volts to the sensor on a 5 V reference circuit. The ECM supplies a ground on a low reference circuit. The MAP sensor provides a signal voltage to the ECM, relative to the pressure changes, on the MAP sensor signal circuit. The ECM converts the signal voltage input to a pressure value.
Under normal operation the greatest pressure that can exist in the intake manifold is at ignition ON, engine OFF, which is equal to the BARO. When the vehicle is operated at wide-open throttle (WOT), the turbocharger can increase the pressure. The lowest manifold pressure occurs when the vehicle is idling or decelerating. The ECM monitors the MAP sensor signal for pressure outside of the normal range.
Conditions for Running the DTC
* DTC P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0128, P0335, or P0336 is not set.
* The engine speed is between 400-8,192 RPM.
* The IAT Sensor parameter is between -7° to +125°C (+19° to +257°F).
* The ECT Sensor parameter is between 70-125°C (158-257°F).
* This DTC runs continuously within the enabling conditions.
Conditions for Setting the DTCs
The engine control module (ECM) detects that the actual measured airflow from MAF, MAP, and throttle position is not within range of the calculated airflow that is derived from the system of models for more than 2 s.
Action Taken When the DTC Sets
DTC P0106 is a Type B DTC.
Conditions for Clearing the MIL/DTC
DTC P0106 is a Type B DTC.
Diagnostic Aids
* A wide open throttle (WOT) acceleration from a stop should cause the MAP sensor parameter on the scan tool to increase rapidly to near the BARO parameter at the time of the 1-2 shift.
* The BARO that is used by the ECM to calculate the air flow models is initially based on the MAP sensor at ignition ON. When the engine is running, the ECM will continually update the BARO value near WOT using the MAP sensor and a calculation. A skewed MAP sensor will cause the BARO value to be inaccurate.
Reference Information
Schematic Reference
Engine Controls Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Outside Rearview Mirror - Driver
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module References for scan tool information
Special Tools
GE-23738-A - Vacuum Pump
For equivalent regional tools, refer to Special Tools Tools and Equipment.
Circuit/System Verification
1. Ignition ON, verify that DTC DTC P0641, P0651, P0697, or P06A3 is not set.
• If none of the DTCs are set
Refer to DTC P0641, P0651, P0697, or P06A3 (ECM) Powertrain Management (ECM) for further diagnosis.
• If the DTC is not set
2. If you were sent here from DTC P0068, P0101, P0121, P0236, or P1101; refer to Circuit/System Testing.
3. Ignition ON, verify the scan tool TB Idle Airflow Compensation parameter is less than 90 %.
• If 90% or greater
Refer to Throttle Body Cleaning Procedures.
• If less than 90%
4. Verify the scan tool Throttle Position Sensors 1 and 2 Agree/Disagree parameter displays Agree while performing the Throttle Sweep Test with a scan tool.
• If Disagree
Refer to DTC P0641, P0651, P0697, or P06A3 (ECM) Powertrain Management (ECM) for further diagnosis.
• If Agree
5. Determine the current vehicle testing altitude.
6. Verify the scan tool MAP Sensor pressure parameter is within the range specified in the Altitude Versus Barometric Pressure Specifications table.
• If the MAP Sensor parameter is not in range
Refer to Circuit/System Testing.
• If the MAP Sensor parameter is in range
7. Verify the scan tool Boost Pressure Sensor parameter is within the range specified in the Altitude Versus Barometric Pressure Specifications table.
• If the Boost Pressure Sensor parameter is not in range
Refer to DTC P0236, P0237, or P0238 P0236 for further diagnosis.
• If the Boost Pressure Sensor parameter is in range
8. Verify the scan tool Boost Pressure Sensor parameter decreases after starting the engine.
• If the Boost Pressure Sensor parameter does not decrease
Refer to DTC P0236, P0237, or P0238 P0236 for further diagnosis.
• If the Boost Pressure Sensor parameter does decrease
9. Engine idling, verify the scan tool MAP Sensor pressure parameter is between 26-52 kPa (3.8-7.5 psi) and changes with accelerator pedal input.
• If not between 26-52 kPa (3.8-7.5 psi) or does not change
Refer to Circuit/System Testing.
• If between 26-52 kPa (3.8-7.5 psi) and changes
10. Verify the scan tool MAF Sensor g/s parameter changes smoothly and gradually as the engine speed is increased and decreased while performing the actions listed below.
1. Engine idling
2. Perform the scan tool snapshot function.
3. Increase the engine speed slowly to 3,000 RPM and then back to idle.
4. Exit from the scan tool snapshot and review the data.
5. Observe the MAF Sensor parameter frame by frame with a scan tool.
• If the MAF Sensor parameter does not change smoothly and gradually
Refer to DTC P0101 P0101.
• If the MAF Sensor parameter does change smoothly and gradually
11. 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.
12. Verify a DTC does not set.
• If the DTC sets
Refer to Circuit/System Testing.
• If the DTC does not set
13. All OK.
Circuit/System Testing
1. Verify the integrity of the entire air induction system and verify that none of the following conditions exist:
* Any damaged components
* Improper operation of turbocharger wastegate actuator or bypass valve
* Loose or improper installation of the turbocharger and the charge air cooler, including the flexible ductwork
* An air flow restriction
* Any vacuum leak
* Improperly routed vacuum hoses
* In cold climates, inspect for any snow or ice buildup at the BARO port on the ECM
* A restriction in the MAP sensor port or the BARO port
* Proper operation of the Positive Crankcase Ventilation (PCV) system
* Missing, restricted or leaking exhaust components. Refer to Symptoms - Engine Exhaust Symptoms - Engine Exhaust.
* Engine mechanical condition; for example: low compression or incorrect timing chain installation. Refer to Symptoms - Engine Mechanical Symptoms - Engine Mechanical.
• If a condition is found
If a condition is found, repair or replace the component as appropriate.
• If no condition is found
2. Ignition OFF, disconnect the harness connector at the B74 Manifold Absolute Pressure sensor.
3. 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 2 ohms between the low reference circuit terminal 2 and ground.
• If 2 ohms or greater
1. Ignition OFF, disconnect the X2 harness connector at the K20 Engine Control Module.
2. Test for less than 2 ohms in the low reference circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K20 Engine Control Module.
• If less than 2 ohms
4. Ignition ON.
5. Test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground.
• If less than 4.8 V
1. Ignition OFF, disconnect the X2 harness connector at the K20 Engine Control Module.
2. Test for infinite resistance between the 5 V reference circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the 5 V reference circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K20 Engine Control Module.
Note: If the signal circuit is shorted to a voltage the engine control module or the sensor may be damaged.
• If greater than 5.2 V
1. Ignition OFF, disconnect the X2 harness connector at the K20 Engine Control Module.
2. Ignition ON, test for less than 1 V between the 5 V reference circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K20 Engine Control Module.
• If between 4.8-5.2 V
6. Ignition ON, verify the scan tool MAP Sensor parameter is less than 0.5 V.
• If 0.5 V or greater
1. Ignition OFF, disconnect the X2 harness connector at the K20 Engine Control Module.
2. Ignition ON, test for less than 1 V between the signal circuit terminal 3 and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K20 Engine Control Module.
• If less than 0.5 V
7. Ignition OFF, install a 3 A fused jumper wire between the signal circuit terminal 3 and the 5 V reference circuit terminal 1.
8. Ignition ON, verify the scan tool MAP voltage parameter is greater than 4.5 V.
• If 4.5 V or less
1. Ignition OFF, disconnect the X2 harness connector at the K20 Engine Control Module.
2. Remove the jumper wire, test for infinite resistance between the signal circuit terminal 3 and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the signal circuit end to end.
• If 2 ohms or greater, repair the open or high resistance in the circuit.
• If less than 2 ohms, replace the K20 Engine Control Module.
• If greater than 4.5 V
9. Test or replace the B74 Manifold Absolute Pressure sensor.
Component Testing
Note: You must perform the Circuit/System Testing in order to verify the integrity of the MAP sensor circuits before proceeding with the Component Testing.
Skewed Sensor Test
1. Ignition OFF, remove the B74 Manifold Absolute Pressure sensor from the engine. Connect the harness to the sensor, if disconnected.
2. Ignition ON, observe and note the scan tool MAP Sensor parameter value.
3. Using the first column of the table below, find the table value that is closest to the observed MAP Sensor parameter value.
THEN
4. Connect the GE-23738-A - vacuum pump to the sensor.
5. Ignition ON, observe and note the scan tool MAP Sensor parameter value, when performing the following Step.
Note: When -17 kPa (5.0 in Hg) vacuum is applied, the MAP Sensor parameter value should change by -17 kPa (-2.5 psi) ±5%.
6. Apply -17 kPa (5.0 inHg) of vacuum to the B74 Manifold Absolute Pressure sensor, with the GE-23738-A - vacuum pump. Verify the parameter is within the range of the table's second column, for the table value used in Step 3.
• If not within the acceptable range
Replace the B74 Manifold Absolute Pressure sensor.
• If within the acceptable range
7. Ignition ON, observe and note the scan tool MAP Sensor parameter value, when performing the following Step.
Note: When -34 kPa (10.0 in Hg) vacuum is applied, the MAP sensor parameter value should change by -34 kPa (-5.0 psi) ±5%.
8. Apply -34 kPa (10.0 inHg) of vacuum to the B74 Manifold Absolute Pressure sensor, with the GE-23738-A - vacuum pump , observe and note the scan tool MAP Sensor parameter value. Verify the parameter is within the range of the table's third column, for the table value used in Step 3.
• If not within the acceptable range
Replace the B74 Manifold Absolute Pressure sensor.
• If within the acceptable range
9. All OK.
Erratic Signal Test
1. Ignition OFF, remove the B74 Manifold Absolute Pressure sensor and disconnect the harness.
2. Install a 3 A fused jumper wire between the 5 V reference circuit terminal 1 of the sensor and the sensor harness.
3. Install a jumper wire between the low reference circuit terminal 2 of the sensor and ground.
4. Install a jumper wire to the signal circuit terminal 3 of the sensor.
5. Connect a DMM between the jumper wire and ground.
6. Ignition ON, observe the DC voltage on the DMM. Slowly apply vacuum to the sensor with the GE-23738-A - vacuum pump. Verify the voltage changes, without any spikes or dropouts, between 4.9-0.2 V.
• If not between 4.9-0.2 V or has spikes or dropouts
Replace the B74 Manifold Absolute Pressure sensor.
• If between 4.9-0.2 V and there are no spikes or dropouts
7. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Manifold Absolute Pressure Sensor Replacement Service and Repair
* Control Module References Control Module References for ECM replacement, programming, and setup.