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P0107





DTC P0107 or P0108

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provide 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










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 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. 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

* DTC P0697 is not set.

* The engine is running.

* This DTC runs continuously within the enabling conditions.

Conditions for Setting the DTC

P0107

The ECM detects that the MAP sensor voltage is less than 0.20 V for more than 5 s.

P0108

The ECM detects that the MAP sensor voltage is more than 4.80 V for more than 5 s.

Action Taken When the DTC Sets

DTCs P0107 and P0108 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0107 and P0108 are Type B DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics (LHU) [1][2]Electrical Diagrams

Connector End View Reference

Component Connector End Views Sunshade - Left

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References Control Module References for scan tool information

Special Tools

GE-23738-A - Vacuum Pump

For equivalent regional tools, refer to Special Tools (Diagnostic Tools) Special Tools (Diagnostic Tools).

Circuit/System Verification

1. Ignition ON.

2. Verify that DTC P0641, P0651, P0697, or P06A3 is not set.

• If the DTC is set, refer to DTC P0641, P0651, P0697, or P06A3 (ECM) P0641.

3. If you were sent here from DTC P0068, P0101, P0121, P0236, or P1101; refer to Circuit/System Testing.

4. Ignition ON.

5. Verify the scan tool Throttle Body Idle Airflow Compensation parameter is less than 90%.

• If 90% or greater
Refer to Throttle Body Cleaning Procedures.

• If less than 90%

6. Verify the scan tool Throttle Body Sensors 1 and 2 Agree/Disagree parameter displays Agree while performing the Throttle Sweep Test with a scan tool.

• If Disagree
Refer to DTC P0121-P0123, P0222, P0223, P16A0-P16A2, or P2135 P0121 for further diagnosis.

• If Agree

7. Determine the current vehicle testing altitude.

8. Verify the scan tool MAP Sensor pressure parameter is within the range specified in the Altitude Versus Barometric Pressure 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

9. Verify the engine is equipped with a turbocharger.

• If not equipped with a turbocharger
Refer to Step 12.

• If equipped with a turbocharger

10. Verify the scan tool Boost Pressure Sensor parameter is within the range specified in the Altitude Versus Barometric Pressure Altitude Versus Barometric Pressure table.

• If the Boost Pressure Sensor parameter is not in range
Refer to DTC P0236, P0237, or P0238 P0236 for further diagnosis.

• If the Boost Pressure Sensor parameter is within range

11. 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, P0237, or P0238 P0236 for further diagnosis.

• If the Boost Pressure Sensor parameter does decrease

12. 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

13. All OK.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the B74 Manifold Absolute Pressure sensor.

2. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. 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, as indicated:

* X2 harness connector, ECM with 2 face mounted connectors

* X3 harness connector, ECM with 3 face mounted connectors

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, as indicated:

* X2 harness connector, ECM with 2 face mounted connectors

* X3 harness connector, ECM with 3 face mounted connectors

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, as indicated:

* X2 harness connector, ECM with 2 face mounted connectors

* X3 harness connector, ECM with 3 face mounted connectors

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, as indicated:

* X2 harness connector, ECM with 2 face mounted connectors

* X3 harness connector, ECM with 3 face mounted connectors

2. 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

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, as indicated:

* X2 harness connector, ECM with 2 face mounted connectors

* X3 harness connector, ECM with 3 face mounted connectors

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 verify 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 13-21 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).

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 30-38 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).

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 0-15kPa of vacuum to the sensor with the GE-23738-A - Vacuum Pump. Verify the voltage changes, without any spikes or dropouts, between 4.9-0.2 V.

• If not between 4.9-0.2 V or has spikes or dropouts
Replace the B74 Manifold Absolute Pressure sensor.

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

7. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Manifold Absolute Pressure Sensor Replacement Service and Repair

* Control Module References Control Module References for ECM replacement, programming, and setup

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