PRE-RELEASE
DTC P0106
| DTC P0106 |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| DTC Descriptor |
DTC P0106
Manifold Absolute Pressure (MAP) Sensor Performance
| Diagnostic Fault Information |
| Circuit | Short to Ground | High resistance | Open | Short to Voltage | Signal Performance |
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5 V Reference
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P0107, P0193, P0236, P0335, P0697
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P0106, P0107
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P0107
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P0193, P0236, P0606, P0690, P0697, P2227
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P0697
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MAP Sensor Signal
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P0107
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P0106, P0107
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P0107
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P0106, P0108
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P0106
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Low Reference
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-
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P0106
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P0106
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-
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-
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| Typical Scan Tool Data |
MAP Sensor
| Circuit | Short to Ground | Open | Short to Voltage |
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Operating Conditions:
Engine running, transmission in Park or Neutral.
Parameter Normal Range: 20-48 kPa, varies with altitude. |
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5 V Reference
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0 kPa
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0 kPa
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0-30 kPa
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MAP Sensor Signal
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0 kPa
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0 kPa
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255 kPa
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Low Reference
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-
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80-250 kPa
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-
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| 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). During normal operation, the highest pressure that can occur in the intake manifold with the ignition ON and the engine OFF is equal to the barometric pressure (BARO). When the vehicle is run with wide open throttle (WOT) , the turbocharger can increase the pressure close to 240 kPa (2.4 bar). The lowest manifold pressure arises when the car's speed decreases and is within the range 13-48 kPa (0.13-0.48 bar).
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:
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The engine cranking model uses BARO and boost pressure as inputs
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The engine running model uses BARO, boost pressure, throttle opening and engine speed as inputs
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| Conditions for Running the DTC |
P0106 - Engine Cranking
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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.
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The engine OFF timer is more than 4 s before cranking begins.
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The engine is cranking at less than 400 RPM for at least 200 ms.
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This DTC runs once per key cycle within the enabling conditions.
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P0106 - Engine Running
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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.
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The engine is running and the ECM has counted more than 200 RPM.
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The engine speed is more than 1,500 RPM once during the drive cycle.
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If start-up ECT is less than -8°C (+18°F), then the diagnostic is disabled until the ECT reaches 30°C (86°F).
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The change in the MAP Sensor parameter is more than 10 kPa once during the drive cycle.
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The TP Sensor parameter is less than 25% once during the drive cycle.
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This DTC runs continuously within the enabling conditions.
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| 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 s.P0106 - Engine Running
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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 s continuously, or 50 s cumulative.
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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 s continuously, or 50 s cumulative.
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| 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 |
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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.
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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.
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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.
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| Reference Information |
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Turbocharger System Description
Electrical Information Reference
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Special Tools
EN 35555 Metal Mityvac
For equivalent regional tools, refer to Special Tools .
| Circuit/System Verification |
| 1. |
Verify that DTC P0697 is not set.
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| 2. |
If DTC P0697 is set, refer to
DTC P0641, P0651, P0697, or P06A3 (ECM)
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| 3. |
Verify that restrictions do not exist in the exhaust system. Refer to
Restricted Exhaust
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| 4. |
Verify that the engine is in good mechanical condition. Refer to
Symptoms - Engine Mechanical
.
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| 5. |
Ignition OFF for 90 s, determine the current vehicle testing altitude.
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| 6. |
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.
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| 7. |
Ignition ON, observe the scan tool MAP Sensor parameter. Start the engine. The MAP Sensor parameter should change.
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| 8. |
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.
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| 9. |
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.
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| Circuit/System Testing |
| 1. |
Verify the integrity of the entire air induction system including all turbocharger components by inspecting for the following conditions:
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Any damaged components
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Loose or improper installation including the flexible ductwork of the turbocharger and the CAC
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An air flow restriction
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Any vacuum leak
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In cold climates, inspect for any snow or ice buildup at the BARO port on the K20 ECM
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A restriction in the MAP sensor port or the BARO port
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| 2. |
Ignition OFF, disconnect the harness connector at the B74 MAP sensor.
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Ignition OFF for 90 s, test for less than 5 Ω between the low reference circuit terminal 2 and ground.
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| 4. |
If more than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.
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| 5. |
Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground.
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| 6. |
If less 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 ECM.
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| 7. |
If more than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
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| 8. |
Verify the scan tool MAP Sensor parameter is less than 1 kPa.
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| 9. |
If more than the specified range, test the signal circuit terminal 3 for a short to voltage. If the circuit tests normal, replace the K20 ECM.
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| 10. |
Install a 3 A fused jumper wire between the signal circuit terminal 3 and the 5 V reference circuit terminal 1. Verify the scan tool MAP Sensor parameter is more than 254 kPa.
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| 11. |
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.
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| 12. |
If the circuits test normal, test or replace the B74 MAP sensor.
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| Component Testing |
| Note | ||
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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
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Using the following steps and referencing the table below will determine if the B74 MAP sensor is skewed.
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| 2. |
Ignition ON, engine OFF, observe the MAP sensor scan tool parameter.
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| 3. |
Use the observed MAP Sensor Scan Tool parameter that is closest to a value that is indicated in the first column.
THEN |
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| 4. |
Using the
EN 35555
Mityvac to apply 5 in Hg (0.169 bar) 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.
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| 5. |
Using the
EN 35555
Mityvac to apply 10 in Hg (0.338 bar) 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.
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| 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 |
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100 kPa
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79-87 kPa
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62-70 kPa
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95 kPa
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74-82 kPa
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57-65 kPa
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90 kPa
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69-77 kPa
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52-60 kPa
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80 kPa
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59-67 kPa
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42-50 kPa
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70 kPa
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49-57 kPa
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32-40 kPa
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60 kPa
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39-47 kPa
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22-30 kPa
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Erratic Signal Test
| 1. |
Ignition OFF, remove the B74 MAP sensor.
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| 2. |
Install a 3 A fused jumper wire between the 5 V reference circuit terminal 1 and the corresponding terminal of the B74 MAP sensor.
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Install a jumper wire between the low reference circuit terminal 2 of the B74 MAP sensor and ground.
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Ignition ON, with the
EN 35555
Mityvac , slowly apply vacuum to the sensor while measuring the voltage at terminal 3 of the MAP sensor. The voltage should vary between 0-5 V, without any spikes or dropouts.
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| 5. |
If the voltage reading is erratic, replace the B74 MAP sensor.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Manifold Absolute Pressure Sensor Replacement
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Control Module References
for ECM replacement, setup, and programming
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