Chevrolet Trax: DTC P0106
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 Performance
Diagnostic Fault Information
Typical Scan Tool Data
MAP Sensor
MAP Sensor, if equipped with Turbocharger
Circuit Description
The manifold absolute pressure (MAP) sensor measures the pressure inside the
intake manifold. Pressure in the
intake manifold is affected by engine speed, throttle opening, air temperature,
barometric pressure (BARO); and
if equipped turbocharger output. A diaphragm within the MAP sensor is displaced
by the pressure changes that
occur from the varying load and operating conditions of the engine. The sensor
translates this action into
electrical resistance.
The MAP sensor wiring includes 3 circuits. The engine control module (ECM)
supplies a regulated 5 volts to
the sensor on a 5 V reference circuit. The ECM supplies a ground on a low
reference circuit. The MAP sensor
provides a signal voltage to the ECM, relative to the pressure changes, on the
MAP sensor signal circuit. The
ECM converts the signal voltage input to a pressure value.
Under normal operation the greatest pressure that can exist in the intake
manifold is at ignition ON, engine
OFF, which is equal to the BARO. If equipped, a turbocharger can increase the
pressure above BARO, when
the vehicle is operated at wide-open throttle (WOT). The lowest manifold
pressure occurs when the vehicle is
idling or decelerating. The ECM monitors the MAP sensor signal for pressure
outside of the normal range.
Conditions for Running the DTC
- DTCs P0107, P0108, P0111, P0112, P0113, P0114, P0116, P0117, P0118,
P0119, P0128, P0335, P0336
are not set.
- The engine speed is between 400-6500 RPM.
- The engine coolant temperature (ECT) sensor is between -7 to +125ºC
(19.4 and 257ºF).
- The intake air temperature (IAT) sensor is between -20 to +125ºC (-4 and
+257ºF).
- This DTC runs continuously when the above conditions are met.
Conditions for Setting the DTC
The ECM detects that the MAP Sensor pressure is not within range of the
calculated pressure that is derived
from a system of models for more than 0.5 s.
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 (Encore) , Engine Controls Schematics (Trax)
Connector End View Reference
WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS -
INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT
CONNECTOR END VIEWS - INDEX - TRAX
Description and Operation
Turbocharger System Description
Electrical Information Reference
- Circuit Testing
- Connector Repairs
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) ,
Powertrain Diagnostic Trouble
Code (DTC) Type Definitions (2H0)
Scan Tool Reference
Control Module References for scan tool information
Special Tools
GE-23738-A Vacuum Pump
For equivalent regional tools, refer to Special Tools (Diagnostic Tools) .
Circuit/System Verification
- Ignition ON.
- Verify that DTC P0641, P0651, P0697, or P06A3 is not set.
- If any of the DTCs are set
Refer to DTC P0641, P0651, P0697, or P06A3 (ECM) for further diagnosis.
- If none of the DTC are set
- If you were sent here from DTC P0068, P0101, P0121, P0236, or P1101;
refer to Circuit/System Testing.
- Ignition ON.
- Verify the scan tool Throttle Body Idle Airflow Compensation parameter
is less than 90%.
Refer to Throttle Body Inspection and Cleaning .
- Verify the scan tool Throttle Position Sensors 1 and 2 Agree/Disagree
parameter displays Agree while
performing the Throttle Sweep Test with a scan tool.
Refer to DTC P0121-P0123, P0222, P0223, or P2135 for further diagnosis.
- Determine the current vehicle testing altitude.
- Verify the scan tool MAP Sensor parameter is within the range specified
in the Altitude Versus
Barometric Pressure table.
- If the MAP Sensor parameter is not in range
Refer to Circuit/System Testing.
- If the MAP Sensor parameter is in range
- Verify the engine is equipped with a turbocharger.
- If not equipped with a turbocharger
Refer to Step 12.
- If equipped with a turbocharger
- Verify the scan tool Boost Pressure Sensor parameter is within the range
specified in the Altitude Versus
Barometric Pressure table.
- If the Boost Pressure Sensor parameter is not in range
Refer to DTC P0236 for further diagnosis.
- If the Boost Pressure Sensor parameter is in range
- Verify the scan tool Boost Pressure Sensor parameter decreases after
starting the engine.
- If the Boost Pressure Sensor parameter does not decrease
Refer to DTC P0236 for further diagnosis.
- If the Boost Pressure Sensor parameter is within range
- Engine idling, verify the scan tool MAP Sensor pressure parameter is
between 26-52 kPa (3.8-7.5 PSI)
and changes with accelerator pedal input.
- If not between 26-52 kPa (3.8-7.5 PSI) or does not change
Refer to Circuit/System Testing.
- If between 26-52 kPa (3.8-7.5 PSI) and changes
- Verify the scan tool MAF Sensor g/s parameter changes smoothly and
gradually as the engine speed is
increased and decreased while performing the actions listed below.
- Engine idling
- Perform the scan tool snapshot function.
- Increase the engine speed slowly to 3000 RPM and then back to idle.
- Exit from the scan tool snapshot and review the data.
- Observe the MAF Sensor parameter frame by frame with a scan tool.
- If the MAF Sensor parameter does not change smoothly and gradually
Refer to DTC P0101.
- If the MAF Sensor parameter does change smoothly and gradually
- 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.
- Verify a DTC does not set.
Refer to Circuit/System Testing.
- All OK.
Circuit/System Testing
- Check the integrity of the entire air induction system and verify that
none of the following conditions
exist:
- Any damaged components
- Improper operation of turbocharger wastegate actuator or bypass valve,
if equipped
- Loose or improper installation of the turbocharger and the charge air
cooler, including the flexible
ductwork, if equipped
- An air flow restriction
- Any vacuum leak
- Improperly routed vacuum hoses
- In cold climates, inspect for any snow or ice buildup at the BARO port
on the ECM, if equipped
- A restriction in the MAP Sensor port or the BARO port
- Proper operation of the positive crankcase ventilation system
- Missing, restricted or leaking exhaust components. Refer to Symptoms -
Engine Exhaust .
- Engine mechanical condition; for example: low compression or incorrect
timing chain installation.
- Refer to Symptoms - Engine Mechanical .
- If a condition is found
Repair or replace the component as appropriate.
- Ignition OFF, and all vehicle systems OFF, it may take up to 2 min. for
all vehicle systems to power
down. Disconnect the harness connector at the B74 Manifold Absolute Pressure
Sensor.
- Test for less than 2 ohms between the low reference circuit terminal 2
and ground.
- Ignition OFF, disconnect the K20 Engine Control Module.
- Test for less than 2 ohms in the low reference circuit end to end.
- If 2 ohms or greater, repair the open/high resistance in the circuit.
- If less than 2 ohms, replace the K20 Engine Control Module.
- If less than 2 ohms
- Ignition ON.
- Test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and
ground.
- Ignition OFF, disconnect the K20 Engine Control Module.
- Test for infinite resistance between the 5 V reference circuit and
ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- If infinite resistance
- Test for less than 2 ohms in the 5 V reference circuit end to end.
- If 2 ohms or greater, repair the open/high resistance in the circuit.
- If less than 2 ohms, replace the K20 Engine Control Module.
NOTE: If the signal circuit is shorted to a voltage the ECM or the
MAP
Sensor may be damaged.
- Ignition OFF, disconnect the K20 Engine Control Module.
- Ignition ON, test for less than 1 V between the 5 V reference circuit
and ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- If less than 1 V, replace the K20 Engine Control Module.
- If between 4.8-5.2 V
- Ignition ON, verify the scan tool MAP Sensor parameter is less than 0.5
V.
- Ignition OFF, disconnect the K20 Engine Control Module.
- Ignition ON, test for less than 1 V between the signal circuit terminal
3 and ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- If less than 1 V, replace the K20 Engine Control Module.
- If less than 0.5 V
- Ignition OFF, install a 3 A fused jumper wire between the signal circuit
terminal 3 and the 5 V reference
circuit terminal 1.
- Ignition ON, verify the scan tool MAP voltage parameter is greater than
4.5 V.
- Ignition OFF, disconnect the K20 Engine Control Module.
- Remove the jumper wire, test for infinite resistance between the signal
circuit terminal 3 and
ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- If infinite resistance
- Test for less than 2 ohms in the signal circuit end to end.
- If 2 ohms or greater, repair the open or high resistance in the circuit.
- If less than 2 ohms, replace the K20 Engine Control Module.
- If greater than 4.5 V
- Test or replace the B74 Manifold Absolute Pressure Sensor.
Component Testing
NOTE:
You must perform the Circuit/System Testing in order to Check the
integrity of
the MAP Sensor circuits before proceeding with the Component Testing.
Skewed Sensor Test
- Ignition OFF, remove the B74 Manifold Absolute Pressure Sensor from the
engine. Connect the harness
to the sensor, if disconnected.
- Ignition ON, apply 17 kPa (5.0 in Hg) of vacuum to the B74 Manifold
Absolute Pressure Sensor, with the
GE-23738-A . Verify the scan tool MAP Sensor pressure parameter decreases
between 13-21 kPa (1.8-
3.0 PSI).
- If the parameter does not decrease between 13-21 kPa (1.8-3.0 PSI).
Replace the B74 Manifold Absolute Pressure Sensor.
- If the parameter does decrease between 13-21 kPa (1.8-3.0 PSI).
- Apply 34 kPa (10.0 in Hg) of vacuum to the B74 Manifold Absolute
Pressure Sensor, with the GE-
23738-A . Verify the scan tool MAP Sensor pressure parameter decreases
between 30-38 kPa (4.4-5.5
PSI).
- If the parameter does not decrease between 30-38 kPa (4.4-5.5 PSI).
Replace the B74 Manifold Absolute Pressure Sensor.
- If the parameter does decrease between 30-38 kPa (4.4-5.5 PSI).
- All OK.
Erratic Signal Test
- Ignition OFF, remove the B74 Manifold Absolute Pressure Sensor and
disconnect the harness.
- Install a 3 A fused jumper wire between the 5 V reference circuit
terminal 1 of the sensor and the sensor
harness.
- Install a jumper wire between the low reference circuit terminal 2 of
the sensor and ground.
- Install a jumper wire to the signal circuit terminal 3 of the sensor.
- Connect a DMM between the jumper wire and ground.
- Ignition ON, observe the DC voltage on the DMM. Slowly apply between
0-15 kPa (0-4.4 in Hg) of
vacuum to the sensor with the GE-23738-A . Verify the voltage changes,
without any spikes or dropouts,
between 0.2-4.9 V.
- If not between 0.2- 4.9 V or has spikes or dropouts
Replace the B74 Manifold Absolute Pressure Sensor.
- If between 0.2 -4.9 V and there are no spikes or dropouts
- All OK.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
- Manifold Absolute Pressure Sensor Replacement
- Control Module References for ECM replacement, programming and setup
READ NEXT:
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.
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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.
Diag
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.
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SEE MORE:
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
DT
WARNING: Refer to Brake Fluid Irritant Warning .
CAUTION: Refer to Brake Fluid Effects on Paint and Electrical
Components Caution .
CAUTION: Only use products that comply with GM specifications and check
manufacturer information respectively. We recommend the use of GM
genuine products. Instruction