P0106
DTC P0106 (LUW)
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
Circuit/System Description
The manifold absolute pressure (MAP) sensor responds to pressure changes in the intake manifold. The pressure changes occur based on the engine load. The engine control module (ECM) supplies 5 V to the MAP sensor on the 5 V reference circuit. The ECM provides a ground on the low reference circuit. The MAP sensor provides a signal to the ECM on the MAP sensor signal circuit which is relative to the pressure changes in the intake manifold. The ECM detects a low signal voltage at a low MAP, such as during an idle or a deceleration. The ECM detects a high signal voltage at a high MAP, such as the ignition is ON, with the engine OFF, or at a wide open throttle (WOT). The MAP sensor is also used to determine the barometric pressure (BARO).
Conditions for Running the DTC
* DTCs P0102, P0103, P0107, P0108, P0111, P0112, P0113, P0116, P0117, P0118, P0119, P0335, P0336 are not set
* The engine speed is between 400-7 000 RPM.
* The engine coolant temperature (ECT) sensor is between -7 to +125°C (19.4-257°F).
* The intake air temperature (IAT) sensor is between -20 to +125°C (-4 to +257°F).
* This DTC runs continuously when the above conditions are met.
Conditions for Setting the DTC
The ECM determines if the MAP sensor is stuck within the normal operating range.
Action Taken When the DTC Sets
DTC P0106 is a Type B DTC.
Conditions for Clearing the DTC
DTC P0106 is a Type B DTC.
Reference Information
Schematic Reference
Engine Controls Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
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
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 P0697 is not set.
• If the DTC sets, refer to DTC P0641, P0651, P0697, or P06A3 (LUW, ECM) Powertrain Management (LUW, ECM).
2. 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 manifold absolute pressure sensor pressure parameter should be within the specified range indicated in the table.
3. Ignition ON, engine OFF, observe the scan tool BARO 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.
4. Start the engine and observe the scan tool MAP Sensor parameter. The MAP sensor pressure parameter should change while starting the engine.
5. 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
Note: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
1. 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.
2. Verify the integrity of the entire air induction system components by inspecting for the following conditions:
* Any damaged components
* An air flow restriction
* Any vacuum leak
* Improperly routed vacuum hoses
* A restriction in the MAP sensor port
3. Ignition OFF, disconnect the harness connector at the B74 Manifold Absolute Pressure Sensor.
4. Ignition OFF for 60 s, test for less than 5 ohms 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.
5. 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.
6. 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.
7. 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 121 kPa (18 755 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.
8. 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 - Mityvacto 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 reading should be within range that is indicated in the second column.
• If not within the specified range, replace the manifold absolute pressure sensor.
5. Using the EN 23738-A - Mityvacto 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 reading should be within range that is indicated in the second 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 repair.
* Manifold Absolute Pressure Sensor Replacement Service and Repair.
* Control Module References Control Module References for ECM replacement, programming and setup.