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Home >> Chevy Truck >> 2013 >> Traverse AWD V6-3.6L >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P0108

P0108




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 responds to pressure changes in the intake manifold. The pressure changes occur based on the engine load. The engine control module (ECM) supplies 5 V to the MAP sensor on the 5 V reference circuit. The ECM provides a ground on the low reference circuit. The MAP sensor provides a signal to the ECM on the MAP sensor signal circuit which is relative to the pressure changes in the manifold. The ECM detects a low signal voltage at a low MAP, such as during an idle or a deceleration. The ECM detects a high signal voltage at a high MAP, such as the ignition is ON, with the engine OFF, or at a wide open throttle (WOT). The MAP sensor is also used to determine the barometric pressure (BARO).

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 [1][2]Electrical Diagrams

Connector End View Reference

Component Connector End Views A/C Compressor Clutch

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 Tools and Equipment.

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) Powertrain Management (ECM) for further diagnosis.

• If none of the DTCs are set

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

• If not between 0.3-4.8 V or does not change
Refer to Circuit/System Testing.

• If between 0.3-4.8 V and changes

4. 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 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, 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 X2 harness connector at 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 X2 harness connector at 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 X2 harness connector at 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 X2 harness connector at the K20 Engine Control Module.

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 X2 harness connector at 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 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, observe and note the scan tool MAP Sensor parameter value.

3. Using the first column of the table below, find the table value that is closest to the observed MAP Sensor parameter value.
THEN

4. Connect the GE-23738-A - Vacuum Pump to the sensor.

5. Ignition ON, observe and note the scan tool MAP Sensor parameter value, when performing the following Step.

Note: When -17 kPa (5.0 in Hg) vacuum is applied, the MAP Sensor parameter value should change by -17 kPa (-2.5 psi) ±5%.

6. Apply -17 kPa (5.0 in Hg) of vacuum to the B74 Manifold Absolute Pressure sensor, with the GE-23738-A - Vacuum Pump. Verify the parameter is within the range of the table's second column, for the table value used in Step 3.

• If not within the acceptable range
Replace the B74 Manifold Absolute Pressure sensor.

• If within the acceptable range

7. Ignition ON, observe and note the scan tool MAP Sensor parameter value, when performing the following Step.

Note: When -34 kPa (10.0 in Hg) vacuum is applied, the MAP sensor parameter value should change by -34 kPa (-5.0 psi) ±5%.

8. Apply -34 kPa (10.0 in Hg) of vacuum to the B74 Manifold Absolute Pressure sensor, with the GE-23738-A - Vacuum Pump , observe and note the scan tool MAP Sensor parameter value. Verify the parameter is within the range of the table's third column, for the table value used in Step 3.

• If not within the acceptable range
Replace the B74 Manifold Absolute Pressure sensor.

• If within the acceptable range

9. 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 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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