Chevrolet Trax: DTC P0107 OR P0108

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 Descriptors

DTC P0107

Manifold Absolute Pressure (MAP) Sensor Circuit Low Voltage

DTC P0108

Manifold Absolute Pressure (MAP) Sensor Circuit High Voltage

Diagnostic Fault Information

Typical Scan Tool Data

MAP Sensor

MAP Sensor, when 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 where 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 V 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. Where 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

P0107

• DTCs P0120, P0121, P0122, P0123, P0220, P0221, P0222, P0223 or P0641 are not set
• The engine speed is between 400-6,500 RPM.
• The throttle position is greater than or equal to 0% when the engine speed is less than or equal to 1,000 RPM

or

• The throttle position is greater than or equal to 12.5% when the engine speed is greater than 1,000 RPM.
• This DTC runs continuously when the above conditions are met.

P0108

• The engine has been running for a length of time that is determined by the start-up coolant temperature.
• The length of time ranges from 5.5 min at colder than -30ºC (-22ºF) to 10 s at greater than 30ºC (+86ºF).
• DTCs P0120, P0121, P0122, P0123, P0220, P0221, P0222, P0223 or P0641 are not set
• The throttle position is less than or equal to 1% when the engine speed is less than or equal to 1,200 RPM.

or

• The throttle position is less than or equal to 20% when the engine speed is greater than 1,200 RPM.
• This DTC runs continuously when the above conditions are met.

Conditions for Setting the DTC

P0107

The ECM detects that the MAP sensor voltage is less than 0.05 V for greater than 5 s.

P0108

The ECM detects that the MAP sensor voltage is more than 4.9 V for greater than 5 s.

Action Taken When the DTC Sets

DTCs P0107 and P0108 are Type B DTCs.

Conditions for Clearing the DTC

DTCs P0107 and P0108 are Type B DTCs.

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

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

1. Ignition ON.
2. 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 DTCs are set

3. Engine idling, verify the scan tool MAP voltage parameter is between 0.3 and 4.8 V and changes with accelerator pedal input.

• If not between 0.3 and 4.8 V or does not change

Refer to Circuit/System Testing.

• If between 0.3 and 4.8 V and changes

4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed in the Freeze Frame/Failure Records data.
5. Verify the DTC does not set.

• If the DTC sets

Refer to Circuit/System Testing.

• If the DTC does not set

6. All OK.

Circuit/System Testing

1. 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.
2. Test for less than 2 ohms between the low reference circuit terminal 2 and ground.

• If 2 ohms or greater

1. Ignition OFF, disconnect the K20 Engine Control Module.
2. 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

3. Ignition ON.
4. Test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground.

• If less than 4.8 V

1. Ignition OFF, disconnect the K20 Engine Control Module.
2. 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

3. 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 engine control module or the sensor may be damaged.

• If greater than 5.2 V

1. Ignition OFF, disconnect the K20 Engine Control Module.
2. 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

5. Ignition ON, verify the scan tool MAP Sensor parameter is less than 0.5 V.

• If 0.5 V or greater

1. Ignition OFF, disconnect the K20 Engine Control Module

• 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

6. Ignition OFF, install a 3 A fused jumper wire between the signal circuit terminal 3 and the 5 V reference circuit terminal 1.
7. Ignition ON, verify the scan tool MAP voltage parameter is greater than 4.5 V.

• If 4.5 V or less

1. Ignition OFF, disconnect the K20 Engine Control Module.
2. 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

3. 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

8. 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

1. Ignition OFF, remove the B74 Manifold Absolute Pressure sensor from the engine. Connect the harness to the sensor, if disconnected.
2. Ignition ON, apply 17 kPa (5.0 inHg) of vacuum to the B74 Manifold Absolute Pressure sensor, with the GE-23738-A Vacuum Pump . Verify the scan tool MAP pressure parameter decreases between 13 and 21 kPa (1.8 and 3.0 PSI).

• If the parameter does not decrease between 13 and 21 kPa (1.8 and 3.0 PSI).

Replace the B74 Manifold Absolute Pressure sensor.

• If the parameter does decrease between 13 and 21 kPa (1.8 and 3.0 PSI).

3. Apply 34 kPa (10.0 inHg) of vacuum to the B74 Manifold Absolute Pressure sensor, with the GE-23738- A Vacuum Pump . Verify the scan tool MAP pressure parameter decreases between 30 and 38 kPa (4.4 and 5.5 PSI).

• If the parameter does not decrease between 30 and 38 kPa (4.4 and 5.5 PSI).

Replace the B74 Manifold Absolute Pressure sensor.

• If the parameter does decrease between 30 and 38 kPa (4.4 and 5.5 PSI).

4. All OK.

Erratic Signal Test

1. Ignition OFF, remove the B74 Manifold Absolute Pressure sensor and disconnect the harness.
2. Install a 3 A fused jumper wire between the 5 V reference circuit terminal 1 of the sensor and the sensor harness.
3. Install a jumper wire between the low reference circuit terminal 2 of the sensor and ground.
4. Install a jumper wire to the signal circuit terminal 3 of the sensor.
5. Connect a DMM between the jumper wire and ground.
6. Ignition ON, observe the DC voltage on the DMM. Slowly apply between 0 and 15kPa of vacuum to the sensor with the GE-23738-A Vacuum Pump. Verify the voltage changes, without any spikes or dropouts, between 0.2 and 4.9 V.

• If not between 0.2 and 4.9 V or has spikes or dropouts

Replace the B74 Manifold Absolute Pressure sensor.

• If between 0.2 and 4.9 V and there are no spikes or dropouts

7. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• Manifold Absolute Pressure Sensor Replacement
• Control Module References for Engine Control Module replacement, programming and setup

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