Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | 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 PerformanceDiagnostic Fault Information
Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
|---|---|---|---|---|---|
5-Volt Reference | P0641, P0452, P0107, P0522, P0532, P0807 | P0106, P0107 | P0107 | P0641, P0452, P0107, P0522, P0532, P0807 | P0106, P0107 |
MAP Sensor Signal | P0107 | P0106, P0107 | P0107 | P0641, P0108, P0106, P0523 | P0106, P0107, P1101 |
Low Reference | -- | P0106, P0107 | P0106, P0108, P1101 | -- | P0106, P0108 |
Typical Scan Tool Data
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: Engine Running Parameter Normal Range: 20-48 kPa (Varies with altitude) | |||
5-Volt Reference | 10 kPa | 10 kPa | 104 kPa |
MAP Sensor Signal | 10 kPa | 10 kPa | 104 kPa |
Low Reference | -- | 80-103 kPa | -- |
Circuit/System 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 following table illustrates the possible failure combinations and the resulting DTC or DTCs.
MAF Performance Test | MAP Performance Test 1 | MAP Performance Test 2 | TP Performance Test | DTCs Passed | DTCs Failed |
|---|---|---|---|---|---|
-- | -- | OK | OK | P0101, P0106, P0121, P1101 | None |
OK | OK | Fault | OK | P0101, P0106, P0121, P1101 | None |
Fault | OK | Fault | OK | P0106, P0121, P1101 | P0101 |
OK | Fault | Fault | OK | P0101, P0121, P1101 | P0106 |
Fault | Fault | Fault | OK | P0121, P1101 | P0101, P0106 |
-- | -- | OK | Fault | P0101, P0106, P1101 | P0121 |
OK | OK | Fault | Fault | P0101, P0106, P0121, P1101 | None |
Fault | OK | Fault | Fault | P0101, P0106, P0121 | P1101 |
-- | Fault | Fault | Fault | P0101, P0106, P0121 | P1101 |
Conditions for Running the DTC
| • | DTCs P0016, P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0128, P0335, or P0336 are not set. |
| • | The engine is running. |
| • | The engine coolant is between 70-125°C (158-257°F). |
| • | The intake air temperature is between -7 and +125°C (+19.4 and +257°F). |
| • | This DTC runs continuously when the above conditions are met. |
Conditions for Setting the DTC
The engine control module (ECM) detects that the actual measured airflow from MAF, MAP, and TP is not within range of the calculated airflow that is derived from the system of models for more than 2 seconds.
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.
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. |
| • | A skewed or stuck engine coolant temperature (ECT) sensor or IAT sensor 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 Calculated BARO that is derived from the MAP sensor at ignition on, is only used to help diagnose the BARO sensor in this application. The BARO sensor is used by the ECM to calculate the air flow models. A skewed BARO sensor will cause the air flow model results to be inaccurate. |
Reference Information
Schematic Reference
Connector End View Reference
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Special Tool Reference
| • | J 23738-A Mityvac |
| • | J 35555 Metal Mityvac |
Circuit/System Verification
- Verify that DTCs P0069, P0641, P0651, P2227, P2228, or P2229 are not set.
- Verify that restrictions do not exist in the exhaust system. Refer to Restricted Exhaust .
- Verify that the engine is in good mechanical condition. Refer to Symptoms - Engine Mechanical .
- Ignition ON, observe the scan tool MAP sensor parameter. Start the engine. The MAP Sensor parameter should change.
- Use the scan tool and compare the MAP Sensor parameter to a known good vehicle, under various operating conditions. The readings should be within 3 kPa of the known good vehicle.
- 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.
| ⇒ | If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle . |
Circuit/System Testing
- Verify the integrity of the entire air induction system by inspecting for the following conditions:
- Ignition OFF, disconnect the harness connector at the MAP sensor.
- Ignition OFF for 90 seconds, test for less than 5 ohms of resistance between the low reference circuit terminal A and ground.
- Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal C and ground.
- Verify the scan tool MAP parameter is less than 12 kPa.
- Install a 3A fused jumper wire between the signal circuit terminal B and the 5-volt reference circuit terminal C. Verify the scan tool MAP parameter is greater than 103 kPa.
- If all circuits test normal, test or replace the MAP sensor.
| • | Any damaged components |
| • | Loose or improper installation |
| • | An air flow restriction |
| • | Any vacuum leak |
| • | Improperly routed vacuum hoses |
| • | In cold climates, inspect for any snow or ice buildup. |
| • | Verify that restrictions do not exist in the MAP sensor port or vacuum source. |
| ⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM. |
| ⇒ | If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/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. |
| ⇒ | 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. |
| ⇒ | 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 ECM. |
Component Testing
Important: 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
- Ignition OFF, remove the vacuum source from the MAP sensor.
- Ignition ON, observe and record the scan tool MAP sensor pressure parameter. This is the first MAP sensor reading.
- With the J 23738-A or J 35555 apply 5 in Hg (17 kPa) of vacuum to the MAP sensor. Observe and record the scan tool MAP sensor pressure parameter. This is the second MAP sensor reading.
- Subtract the second MAP sensor reading from the first MAP sensor reading. Verify that the vacuum decrease is within 1 in Hg (4 kPa) of the applied vacuum.
- With the J 23738-A or J 35555 apply 10 in Hg (34 kPa) of vacuum to the MAP sensor. Observe and record the scan tool MAP sensor pressure parameter. This is the third MAP sensor reading.
- Substract the third MAP sensor reading from the first MAP sensor reading. Verify that the vacuum decrease is within 1 in Hg (4 kPa) of the applied vacuum.
| ⇒ | If the vacuum decrease is not within the specified range, replace the MAP sensor. |
| ⇒ | If the vacuum decrease is not within the specified range, replace the MAP sensor. |
Erratic Signal Test
- Ignition OFF, remove the MAP sensor.
- Install a 3A fused jumper wire between the 5-volt reference circuit terminal C and the corresponding terminal of the MAP sensor.
- Install a jumper wire between the low reference circuit terminal A of the MAP sensor and ground.
- Install a jumper wire at terminal B of the MAP sensor.
- Connect a DMM between the jumper wire from terminal B of the MAP sensor and ground.
- Ignition ON, with the J 23738-A or J 35555 , slowly apply vacuum to the sensor while observing the voltage on the DMM. The voltage should vary between 0-5.2 volts, without any spikes or dropouts.
| ⇒ | If the voltage reading is erratic, replace the MAP sensor. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for ECM replacement, setup, and programming |
