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 00
- Manifold Absolute Pressure (MAP) Sensor Performance
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The manifold absolute pressure (MAP) sensor has a 5 V reference circuit, a low reference circuit, and a signal circuit. The engine control module (ECM) supplies 5 V to the MAP sensor on the 5 V reference circuit, and provides a ground on the low reference circuit. The MAP sensor provides a voltage signal to the ECM on the signal circuit relative to the intake manifold pressure changes.
The sensor used on this engine is a three atmosphere sensor. Pressure in the intake manifold is affected by engine speed, throttle opening, turbocharger boost pressure, intake air temperature (IAT), and barometric pressure (BARO). Under normal operation the greatest pressure that can exist in the intake manifold at ignition ON, engine OFF is equal to the BARO. When the vehicle is operated at wide open throttle (WOT), the turbocharger can increase the pressure to near 240 kPa (34.80 PSI). The least manifold pressure occurs when the vehicle is decelerating and can range from 13-48 kPa (1.8-6.9 PSI).
The purpose of this diagnostic is to analyze the performance of the MAP sensor by comparing the measured pressure changes to the following 2 distinct models:
* The engine cranking model uses BARO and boost pressure as inputs.
* The engine running model uses BARO, boost pressure, throttle opening and engine speed as inputs.
Conditions for Running the DTC
* DTCs P0102 00, P0103 00, P0107 00, P0108 00, P0112 00, P0113 00, P0117 00, P0118 00, P0335 31, or P0335 31 are not set.
* The engine speed is between 400-6 500 RPM.
* The engine coolant temperature (ECT) sensor is between 70-125°C (158-257°F).
* The intake air temperature (IAT) sensor is between -20 to +125°C (-4 to +257°F).
* The DTC runs continuously when the above conditions are met.
Conditions for Setting the DTC
The ECM detects that the actual MAP signal is not within the predicted range for greater than 15 s.
Action Taken When the DTC Sets
DTCs P0106 00 is a Type B DTCs.
Conditions for Clearing the DTC
DTCs P0106 00 is a Type B DTCs.
Diagnostic Aids
* The charge air cooler is connected to the turbocharger and to the throttle body by flexible ductwork that requires the use of special high torque fastening clamps. These clamps cannot be substituted. In order to prevent any type of air leak when servicing the ductwork, the tightening specifications and proper positioning of the clamps is critical and must be strictly adhered to.
* Use a solution of dish soap and water in a spray bottle to pinpoint any suspected air leaks in the induction system. This includes vacuum lines, positive crankcase ventilation system, intake manifold, throttle body, charge air cooler assembly.
Reference Information
Schematic Reference
Engine Controls Schematics ([1][2]Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector End Views By Name)
Description and Operation
* Boost Control System Description (LUJ) (Boost Control System Description)
* Turbocharger System Description (LUJ) (Turbocharger System Description)
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 (Programming and Relearning)for scan tool information
Special Tools
EN 23738-A - Mityvac
For equivalent regional tools, refer to Special Tools (Tools and Equipment).
Circuit/System Verification
1. Ignition ON, observe the DTC information with a scan tool. Verify that DTC P0641 00, P0651 00, P0697 00, or P06A3 00 are not set.
• If any of the DTCs are set, refer to DTC P0641, P0651, P0697, or P06A3 (P0641).
2. Verify none of the following conditions exist:
* Restricted exhaust-Refer to Restricted Exhaust (Restricted Exhaust).
* Engine mechanical condition for example, low compression or incorrect timing belt installation-Refer to Symptoms - Engine Mechanical (Symptoms - Engine Mechanical).
* Verify there are no vacuum leaks.
* Verify the positive crankcase ventilation system if operation properly.
3. Determine the current vehicle testing altitude. Compare the MAP Sensor parameter to the reading in the Altitude Versus Barometric Pressure (Altitude Versus Barometric Pressure) table. The B74 Manifold Absolute Pressure Sensor pressure parameter should be within the specified range indicated in the table.
4. Ignition ON, engine OFF, observe the scan tool BARO parameter, Boost Pressure Sensor parameter, and MAP Sensor parameter. Compare the parameters to the Altitude Versus Barometric Pressure (Altitude Versus Barometric Pressure) table. The parameters should be within the specified range indicated in the table.
5. Start the engine and observe the scan tool MAP Sensor parameter. The MAP sensor pressure parameter should change while starting the engine.
6. Use the scan tool and compare the MAP Sensor parameter to the Boost Pressure Sensor parameter during a WOT acceleration at the time of the 1-2 shift. The readings should be within 20 kPa (3.0 PSI) of each other.
7. 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.
Circuit/System Testing
1. Verify the integrity of the entire air induction system including all turbocharger components by inspecting for the following conditions:
* Any damaged components
* Proper operation of wastegate actuator and bypass valve
* Loose or improper installation including the flexible ductwork of the turbocharger and the charge air cooler
* 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
2. Ignition OFF, disconnect the harness connector at the B74 Manifold Absolute Pressure Sensor.
3. Ignition OFF for 1 m, test for less than 5 ohm between the low reference circuit terminal 2 and ground.
• If greater 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 Engine Control Module.
4. Ignition ON, test for 4.8-5.2 V between the B74 Manifold Absolute Pressure Sensor 5 V reference circuit terminal 1 and ground.
• If less than the specified range, test the 5 V reference circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
• 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 Engine Control Module.
5. Verify the scan tool MAP Sensor parameter is 1 kPa (0.14 PSI).
• If greater than the specified value, test the signal circuit terminal 3 for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
6. Install a 3 A fused jumper wire between the B74 Manifold Absolute Pressure Sensor signal circuit terminal 3 and the 5 V reference circuit terminal 1. Verify the scan tool MAP sensor parameter is greater than 126 kPa (18.27 PSI).
• If less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
7. If all circuits test normal, 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. Using the following steps and referencing the table below will determine if the MAP sensor is skewed.
2. Ignition ON, engine OFF, observe the MAP sensor scan tool parameter.
3. Use the observed MAP Sensor Scan Tool parameter that is closest to a value that is indicated in the first column.
then
4. Using the EN 23738-A - mityvac to apply 17 kPa (2.5 PSI) of vacuum to the MAP sensor, the parameter in the first column should decrease by 17 kPa (2.5 PSI). The acceptable range is indicated in the second column.
5. Using the EN 23738-A - mityvac to apply 34 kPa (5.0 PSI) of vacuum to the MAP sensor, the parameter in the first column should decrease by 34 kPa (5.0 PSI). The acceptable range is indicated in the third column.
Erratic Signal Test
1. Ignition OFF, remove the MAP sensor.
2. Install a 3 A fused jumper wire between the 5 V reference circuit terminal 1 and the corresponding terminal of the MAP sensor.
3. Install a jumper wire between the low reference circuit terminal 2 of the MAP sensor and ground.
4. Install a jumper wire at terminal 3 of the MAP sensor.
5. Connect a DMM between the jumper wire from terminal 3 of the MAP sensor and ground.
6. Ignition ON, with the EN 23738-A - mityvac , slowly apply vacuum to the sensor while observing the voltage on the DMM. The voltage should vary between 0-5.2 V, without any spikes or dropouts.
• If the voltage reading is erratic, replace the B74 Manifold Absolute Pressure Sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
Control Module References (Programming and Relearning)for ECM replacement, setup, and programming