DTC P0106 LTD without Turbocharger
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 |
|---|---|---|---|---|---|
5V Reference | P0107, P0452, P0532, P0641 | P0106, P0107 | P0107 | P0108, P0533, P0641 | P0106, P0107 |
MAP Sensor Signal | P0107 | P0106, P0107 | P0107 | P0108 | P0106, P0107, P1101 |
Low Reference | -- | P0106, P0108 | P0106, P0108 | -- | P0106, P0108 |
Typical Scan Tool Data
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: Engine running, transmission in Park or Neutral Parameter Normal Range: 20-48 kPa, varies with altitude | |||
5V Reference | 0 kPa | 0 kPa | 127 kPa |
MAP Sensor | 0 kPa | 0 kPa | 127 kPa |
Low Reference | -- | 127 kPa | -- |
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 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
| • | 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 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 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 Sensor 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
Connector End View Reference
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Special Tools
| • | J 23738-A Mityvac |
| • | J 35555 Metal Mityvac |
| • | For equivalent regional tools, refer to Special Tools. |
Circuit/System Verification
- Verify that DTC P0641 or P0651 is not set.
- Verify that restrictions do not exist in the exhaust system. Refer to Restricted Exhaust.
- Ignition OFF for 90 seconds, determine the current vehicle testing altitude.
- Ignition ON, engine OFF, observe the scan tool BARO parameter. Compare the parameter to the Altitude Versus Barometric Pressure table. The BARO parameter should be within the specified range indicated in the table.
- Use the scan tool and compare the MAP Sensor parameter to a known good vehicle, under various operating conditions. The reading should be within 5 kPa of the known good vehicle.
- 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.
| ⇒ | 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 for 90 seconds, disconnect the harness connector at the B74 MAP sensor.
- Test for less than 5Ω between the low reference circuit terminal 2 and ground.
- Ignition ON, test for 4.8-5.2V between the 5V reference circuit terminal 1 and ground.
- Verify the scan tool MAP Sensor parameter is less than 1 kPa.
- Install a 3A fused jumper wire between the signal circuit terminal 3 and the 5V reference circuit terminal 1. Verify the scan tool MAP Sensor parameter is greater than 126 kPa.
- If the circuits test normal, test or replace the B74 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 K20 ECM. |
| ⇒ | If less than the specified range, test the 5V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM. |
| ⇒ | If greater than the specified range, test the 5V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM. |
| ⇒ | If greater than the specified range, test the signal circuit terminal 3 for a short to voltage. If the circuit tests normal, replace the K20 ECM. |
| ⇒ | If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM. |
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 Signal Test
- Using the following steps and referencing the table below will determine if the MAP sensor is skewed.
- Ignition ON, engine OFF, observe the MAP Sensor scan tool parameter.
- Use the observed MAP Sensor scan tool parameter that is closest to a value that is indicated in the first column.
- Using the J 23738-A Mityvac or the J 35555 Metal Mityvac to apply 5 in Hg of vacuum to the B74 MAP sensor, the parameter in the first column should decrease by 17 kPa. The acceptable range is indicated in the second column.
- Using the J 23738-A Mityvac or the J 35555 Metal Mityvac to apply 10 in Hg of vacuum to the B74 MAP sensor, the parameter in the first column should decrease by 34 kPa.. The acceptable range is indicated in the third column.
THEN
Ignition ON, Engine OFF, MAP Sensor Parameter | MAP Sensor Parameter With 5 Inches of Vacuum Applied | MAP Sensor Parameter With 10 Inches of Vacuum Applied |
|---|---|---|
100 kPa | 79-87 kPa | 62-70 kPa |
95 kPa | 74-82 kPa | 57-65 kPa |
90 kPa | 69-77 kPa | 52-60 kPa |
80 kPa | 59-67 kPa | 42-50 kPa |
70 kPa | 49-57 kPa | 32-40 kPa |
60 kPa | 39-47 kPa | 22-30 kPa |
Erratic Signal Test
- Ignition OFF, remove the B74 MAP sensor.
- Install a 3A fused jumper wire between the 5V reference circuit terminal 1 and the corresponding terminal of the B74 MAP sensor.
- Install a jumper wire between the low reference circuit terminal 2 of the B74 MAP sensor and ground.
- Install a jumper wire at terminal 3 of the B74 MAP sensor.
- Connect a DMM between the jumper wire from terminal 3 of the B74 MAP sensor and ground.
- Ignition ON, with the J 23738-A Mityvac or J 35555 Metal Mityvac , slowly apply vacuum to the sensor while observing the voltage on the DMM. The voltage should vary between 0-5.2V, without any spikes or dropouts.
| ⇒ | If the voltage reading is erratic, replace the B74 MAP sensor. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for ECM replacement, setup, and programming |
DTC P0106 LDK with Turbocharger
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 |
|---|---|---|---|---|---|
5V Reference | P0107, P0193, P0236, P0335, P0642 | P0106, P0107 | P0107 | P0193, P0236, P0606, P0643, P0690, P2227 | P0641, P0642, P0643 |
MAP Sensor Signal | P0107 | P0106, P0107 | P0107 | P0106, P0108 | P0106 |
Low Reference | -- | P0106 | P0106 | -- | -- |
Typical Scan Tool Data
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: Engine running, transmission in Park or Neutral. Parameter Normal Range: 20-48 kPa, varies with altitude. | |||
5V Reference | 0 kPa | 0 kPa | 0-30 kPa |
MAP Sensor | 0 kPa | 0 kPa | 255 kPa |
Low Reference | -- | 80-250 kPa | -- |
Circuit/System Description
The manifold absolute pressure (MAP) sensor has a 5V reference circuit, a low reference circuit, and a signal circuit. The engine control module (ECM) supplies 5V to the MAP sensor on the 5V 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. The least manifold pressure occurs when the vehicle is decelerating and can range from 13-48 kPa.
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
P0106 - Engine Cranking
| • | DTCs P0096, P0097, P0098, P0099, P0107, P0108, P0121, P0122, P0123, P0221, P0222, P0223, P0236, P0237, P0238, P0455, P0496, P2176, P2227, P2228, P2229 are not set. |
| • | The engine OFF timer is greater than 4 seconds before cranking begins. |
| • | The engine is cranking at less than 400 RPM for at least 200 ms. |
| • | This DTC runs once per key cycle within the enabling conditions. |
P0106 - Engine Running
| • | DTCs P0010, P0011, P0013, P0014, P0107, P0108, P0121, P0122, P0123, P0221, P0222, P0223, P0236, P0237, P0238, P0341, P0342, P0343, P0366, P0367, P0368, P2088, P2089, P2090, P2091, P2227, P2228, P2229 are not set. |
| • | The engine is running and the ECM has counted greater than 200 RPM. |
| • | The engine speed is greater than 1,500 RPM once during the drive cycle. |
| • | If start-up ECT is colder than -8°C (+18°F), then the diagnostic is disabled until the ECT reaches 30°C (86°F). |
| • | The change in the MAP Sensor parameter is greater than 10 kPa once during the drive cycle. |
| • | The TP Sensor parameter is less than 25 percent once during the drive cycle. |
| • | This DTC runs continuously within the enabling conditions. |
Conditions for Setting the DTC
P0106 - Engine Cranking
The ECM detects when the engine is cranking that the MAP sensor signal plus a calibrated threshold is not within range of a model derived from BARO, and boost pressure for more than 2 seconds.
P0106 - Engine Running
| • | The ECM detects when the engine is running that the MAP sensor signal is less than or greater than a calibrated minimum/maximum threshold for more than 4 seconds continuously, or 50 seconds cumulative. |
| • | The ECM detects when the engine is running that the MAP sensor signal plus a calibrated threshold is not within range of a model derived from BARO, boost pressure, throttle opening, and engine speed for more than 4 seconds continuously, or 50 seconds cumulative. |
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
| • | The charge air cooler (CAC) 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 and in the CAC assembly. |
| • | The BARO sensor is integrated within the ECM, and it has a port on the housing that allows it to sense the ambient pressure. A buildup of contamination at this opening may hinder the operation of the BARO sensor. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Special Tools
| • | J 23738-A Mityvac |
| • | J 35555 Metal Mityvac |
| • | For equivalent regional tools, refer to Special Tools. |
Circuit/System Verification
- Verify that DTCs P0641, P0642, or P0643 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 OFF for 90 seconds, determine the current vehicle testing altitude.
- 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 table. The parameters should be within the specified range indicated in the table.
- 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 the Boost Pressure Sensor parameter during a WOT acceleration at the time of the 1-2 shift. The readings should be within 20 kPa of each other.
- 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.
| ⇒ | 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 including all turbocharger components by inspecting for the following conditions:
- Ignition OFF for 90 seconds, disconnect the harness connector at the B74 MAP sensor.
- Test for less than 5Ω between the low reference circuit terminal 2 and ground.
- Ignition ON, test for 4.8-5.2V between the 5V reference circuit terminal 1 and ground.
- Verify the scan tool MAP Sensor parameter is less than 1 kPa.
- Install a 3A fused jumper wire between the signal circuit terminal 3 and the 5V reference circuit terminal 1. Verify the scan tool MAP Sensor parameter is greater than 254 kPa.
- If the circuits test normal, test or replace the B74 MAP sensor.
| • | Any damaged components |
| • | Loose or improper installation including the flexible ductwork of the turbocharger and the CAC |
| • | An air flow restriction |
| • | Any vacuum leak |
| • | In cold climates, inspect for any snow or ice buildup at the BARO port on the K20 ECM |
| • | A restriction in the MAP sensor port or the BARO port |
| ⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM. |
| ⇒ | If less than the specified range, test the 5V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM. |
| ⇒ | If greater than the specified range, test the 5V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM. |
| ⇒ | If greater than the specified range, test the signal circuit terminal 3 for a short to voltage. If the circuit tests normal, replace the K20 ECM. |
| ⇒ | If less than the specified range, test the signal circuit terminal 3 for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM. |
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
- Using the following steps and referencing the table below will determine if the MAP sensor is skewed.
- Ignition ON, engine OFF, observe the MAP sensor scan tool parameter.
- Use the observed MAP Sensor Scan Tool parameter that is closest to a value that is indicated in the first column.
- Using the J 23738-A or the J 35555 to apply 5 in Hg of vacuum to the MAP sensor, the parameter in the first column should decrease by 17 kPa. The acceptable range is indicated in the second column.
- Using the J 23738-A or the J 35555 to apply 10 in Hg of vacuum to the MAP sensor, the parameter in the first column should decrease by 34 kPa.. The acceptable range is indicated in the third column.
THEN
Ignition ON, Engine OFF, MAP Sensor Parameter | MAP Sensor Parameter With 5 Inches of Vacuum Applied | MAP Sensor Parameter With 10 Inches of Vacuum Applied |
|---|---|---|
100 kPa | 79-87 kPa | 62-70 kPa |
95 kPa | 74-82 kPa | 57-65 kPa |
90 kPa | 69-77 kPa | 52-60 kPa |
80 kPa | 59-67 kPa | 42-50 kPa |
70 kPa | 49-57 kPa | 32-40 kPa |
60 kPa | 39-47 kPa | 22-30 kPa |
Erratic Signal Test
- Ignition OFF, remove the B74 MAP sensor.
- Install a 3A fused jumper wire between the 5V reference circuit terminal 1 and the corresponding terminal of the B74 MAP sensor.
- Install a jumper wire between the low reference circuit terminal 2 of the B74 MAP sensor and ground.
- Install a jumper wire at terminal 3 of the B74 MAP sensor.
- Connect a DMM between the jumper wire from terminal 3 of the B74 MAP sensor and ground.
- Ignition ON, with the J 23738-A or the J 35555 , slowly apply vacuum to the sensor while observing the voltage on the DMM. The voltage should vary between 0-5.2V, without any spikes or dropouts.
| ⇒ | If the voltage reading is erratic, replace the B74 MAP sensor. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for ECM replacement, setup, and programming |
