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DTC P0107 or P0108 (LF1, LFW)

DTC P0107 or P0108 (LF1, LFW)

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 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

Circuit Short to Ground High Resistance Open Short to Voltage Signal Performance
5 V Reference P0106, P0107, P0108, P0697 P0106, P0107 P0107 P0106, P0108, P0697 P0106, P0107
MAP Sensor Signal P0107 P0106, P0107 P0107 P0106, P0108 P0106, P0107, P1101
Low Reference - P0106, P0108 P0108 - P0106, P0108


Typical Scan Tool Data

MAP Sensor

Circuit Short to Ground Open Short to Voltage
Operating conditions: Engine running, transmission in Park or Neutral Parameter Normal Range: 20-48 kPa (2.9-7.0 psi), varies with altitude
5 V Reference 0 kPa (0 psi) 0 kPa (0 psi) 127 kPa (18.4 psi)
MAP Sensor Signal 0 kPa (0 psi) 0 kPa (0 psi) 127 kPa (18.4 psi)
Low Reference - 127 kPa (18.4 psi) -


Circuit 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 for 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.

Conditions for Running the DTC


• DTC P0697 is not set.

• 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 (3.0L (LF1)) Engine Controls Schematics (2.8L (LAU))

Connector End View Reference

Component Connector End Views

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

Scan Tool Reference

Control Module References for scan tool information

Special Tools


• J 23738-A Mityvac

• J 35555 Metal Mityvac

• For equivalent regional tools, refer to Special Tools .


Circuit/System Verification


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

2. If any of the DTCs are set, refer to DTC P0641, P0651, P0697, or P06A3 (ECM, LF1) .

3. With the ignition ON, check the scan tool's parameter for the MAP sensor. The reading should be between 0.20 and 4.80 V.

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 from the Freeze Frame/Failure Records data.


Circuit/System Testing


1. Ignition OFF for 90 s, disconnect the harness connector at the B74 MAP sensor.

2. Test for less than 5 Ω between the low reference circuit terminal 2 and ground.

3. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.

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

5. 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.

6. If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.

7. Verify the scan tool MAP Sensor parameter is less than 1 kPa (0.2 psi).

8. If greater than the specified range, test the signal circuit's pin 3 for a short to voltage. If the circuit tests normal, replace the K20 ECM.

9. 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 greater than 127 kPa (18.4 psi).

10. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.

11. If the circuits test normal, test or replace the B74 MAP 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.



Erratic Signal Test

1. Ignition OFF, remove the B74 MAP sensor.

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.

3. Install a jumper wire between the low reference circuit terminal 2 of the B74 MAP sensor and ground.

4. Install a jumper wire at terminal 3 of the B74 MAP sensor.

5. Connect a DMM between the jumper wire from terminal 3 of the B74 MAP sensor and ground.

6. Turn on ignition and slowly create, with J 23738-A Mityvac or J 35555 Metal Mityvac, a vacuum by the sensor while observing the voltage on the multimeter. The voltage should vary between 0 and 5 V without any spikes or dropouts.

7. If the voltage reading is erratic, replace the B74 MAP sensor.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ECM replacement, setup, and programming