P0106
DTC P0106
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* 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
MAP Voltage Table
Circuit Description
The intake flow rationality diagnostic provides the within-range rationality check for the mass air flow (MAF), manifold absolute pressure (MAP), and the throttle position (TP) sensors. This is an explicit model-based diagnostic containing 4 separate models for the intake system.
* The throttle model describes the flow through the throttle body and is used to estimate the MAF through the throttle body as a function of barometric pressure (BARO), TP, intake air temperature (IAT), and estimated MAP. The information from this model is displayed on the scan tool as the MAF Performance Test parameter.
* The first intake manifold model describes the intake manifold and is used to estimate MAP as a function of the MAF into the manifold from the throttle body and the MAF out of the manifold caused by engine pumping. The flow into the manifold from the throttle uses the MAF estimate calculated from the above throttle model. The information from this model is displayed on the scan tool as the MAP Performance Test 1 parameter.
* The second intake manifold model is identical to the first intake manifold model except that the MAF sensor measurement is used instead of the throttle model estimate for the throttle air input. The information from this model is displayed on the scan tool as the MAP Performance Test 2 parameter.
* The fourth model is created from the combination and additional calculations of the throttle model and the first intake manifold model. The information from this model is displayed on the scan tool as the TP Performance Test parameter.
The estimates of MAF and MAP obtained from this system of models and calculations are then compared to the actual measured values from the MAF, MAP, and the TP sensors and to each other to determine the appropriate DTC to fail. The table illustrates the possible failure combinations and the resulting DTC or DTCs.
Conditions for Running the DTC
* DTCs P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0128, P0335, P0336, P0401, P0405, P1404 are not set.
* The engine speed is between 500-5,000 RPM.
* The IAT Sensor parameter is between -7 and +60°C (+19 and +140°F).
* The ECT Sensor parameter is between 70-121°C (158-249°F).
* This DTC runs continuously within the enabling conditions.
Conditions for Setting the DTC
The engine control module (ECM) detects that the MAP sensor pressure is not within range of the calculated pressure that is derived from the system of models for more than 0.5 second.
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 skewed or stuck engine coolant temperature (ECT) or IAT will cause the calculated models to be inaccurate and may cause this DTC to run when it should not. Refer to Temperature Versus Resistance.
* 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 wide open throttle (WOT) using the MAP sensor and a calculation. A skewed MAP sensor will cause the BARO value to be inaccurate. Use a scan tool and compare the BARO parameter with the ignition ON to the Altitude vs. Barometric Pressure table. Refer to Altitude Versus Barometric Pressure.
* A skewed MAP sensor will also cause the first and second intake manifold models to disagree with the actual MAP sensor measurements. Use a scan tool and compare the MAP Sensor parameter to a known good vehicle under various operating conditions.
Circuit/System Verification
1. If DTCs P0107, P0108, P0641 or P0651 are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle. Diagnostic Trouble Code Descriptions
2. Ignition ON, observe the scan tool MAP Sensor parameter. Verify the MAP Sensor parameter is reading within the current BARO for your altitude. Refer to Altitude Versus Barometric Pressure.
3. Ignition ON, observe the MAP Sensor kPa parameter with a scan tool. Start the engine. The MAP Sensor kPa parameter should decrease.
4. Verify the integrity of the air induction system by inspecting for the following conditions:
* Damaged components
* Loose or improper installation
* An air flow restriction
* A cracked or restricted MAP sensor vacuum hose
* An intake manifold leak
5. Ignition ON, compare APP sensors 1 and 2 percentages with a scan tool. Verify that they do not differ more than 5 percent when a slow pedal sweep is performed.
Circuit/System Testing
Important: You must perform the Circuit/System Verification before proceeding with the Circuit/System Testing.
1. Ignition OFF, allow sufficient time for the ECM to power down. Disconnect the harness connector at the MAP sensor.
2. Ignition OFF, test for less than 5 ohms of resistance between the low reference circuit terminal A and ground.
• If greater than the specified range, test the low reference circuit for an open or high resistance. If the circuit tests normal, replace the ECM.
3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal C and ground.
• If less than the specified range, test the 5-volt reference circuit for a short to ground, open, or high resistance. If the circuit tests normal, replace the ECM.
• If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
4. Verify the scan tool MAP Sensor parameter is less than 0.2 volt.
• If greater than the specified range, test the signal circuit terminal B for a short to voltage. If the circuit tests normal, replace the ECM.
5. Install a 3-amp fused jumper wire between the signal circuit terminal B and the 5-volt reference terminal C. Verify the scan tool MAP Sensor parameter is greater than 4.9 volts.
• If less than the specified range, test the signal circuit for a short to ground, open, high resistance. If the circuit tests normal, replace the ECM.
6. If all circuits test normal, test or replace the MAP sensor.
Component Testing
Important: You must perform the Circuit/System Testing before proceeding with the Component Testing.
1. Ignition OFF, remove the MAP sensor.
2. Install a 3-amp fused jumper wire between the 5-volt reference circuit terminal C of the sensor and 5 volts.
3. Install a jumper wire between the low reference circuit terminal A of the sensor and ground.
4. Install the J 35555 to the MAP sensor vacuum fitting. Slowly apply vacuum to the sensor while monitoring the voltage between the signal terminal B and the low reference terminal A. The voltage should vary between 4.9-0.2 volts without any spikes or dropouts.
• If the voltage is not within the specified range or is erratic, replace the MAP sensor.
Repair Instructions
* Manifold Absolute Pressure Sensor Replacement
* Refer to Programming and Relearning for ECM setup and programming Programming and Relearning
Repair Verification
1. Ignition ON, observe the MAP Sensor parameter with a scan tool. Verify the MAP Sensor parameter reading is within the current BARO for your altitude. Refer to Altitude Versus Barometric Pressure.
2. Ignition ON, observe the MAP Sensor kPa parameter with a scan tool. Start the engine. The MAP Sensor kPa parameter should decrease.