P0107

P0107-MANIFOLD ABSOLUTE PRESSURE SENSOR CIRCUIT LOW





For a complete wiring diagram Consult Diagrams/Electrical.

- When Monitored:
Engine speed between 600 and 3500 RPM. Battery voltage greater than 10.37 volts.

- Set Condition:
The PCM detects that the MAP Sensor input voltage is below the minimum acceptable value. One Trip Fault. Three good trips to turn off the MIL. The MIL will illuminate and the ETC light will flash if equipped.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.Initial Inspection and Diagnostic Overview.

Diagnostic Test

1. ACTIVE DTC
Start the engine and allow it to reach normal operating temperature.

WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.

NOTE: Diagnose and repair any system voltage or sensor supply voltage DTCs before continuing with this test.

With the scan tool, select View DTCs.
Is the DTC Active at this time?

Yes

- Go To 2

No

- Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Intermittent Condition.

2. (K857) 5-VOLT SUPPLY CIRCUIT




Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Ignition on, engine not running.
Measure the voltage on the (K857) 5-volt Supply circuit in the MAP Sensor harness connector.
Is the voltage between 4.5 to 5.2 volts?

Yes

- Go To 3

No

- Go To 7

3. MAP SENSOR
With a scan tool, monitor the MAP Sensor voltage with the Sensor harness connector disconnected.

NOTE: The sensor voltage should be approximately 5.0 volts (plus or minus.1 volt) with the connector disconnected.

Does the scan tool display the voltage as described above?

Yes

- Verify that there is good pin to terminal contact in the Sensor and Powertrain Control Module connectors. If OK, replace the MAP Sensors.
- Perform the POWERTRAIN VERIFICATION TEST.Powertrain Verification Test.

No

- Go To 4

4. (K1) MAP SIGNAL CIRCUIT SHORTED TO GROUND




Turn the ignition off.
Disconnect the C2 PCM harness connector.
Measure the resistance between ground and the (K1) MAP Signal circuit in the MAP Sensor harness connector.
Is the resistance below 100 ohms?

Yes

- Repair the short to ground in the (K1) MAP Signal circuit.
- Perform the POWERTRAIN VERIFICATION TEST.Powertrain Verification Test.

No

- Go To 5

5. (K1) MAP SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT




Measure the resistance between the (K1) MAP Signal circuit and the (K900) Sensor ground circuit in the MAP Sensor harness connector.
Is the resistance below 100 ohms?

Yes

- Repair the short between the (K900) Sensor ground and the (K1) MAP Signal circuit.
- Perform the POWERTRAIN VERIFICATION TEST.Powertrain Verification Test.

No

- Go To 6

6. EXCESSIVE RESISTANCE IN THE (K1) MAP SIGNAL CIRCUIT




CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals, resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.

Measure the resistance of the (K1) MAP Signal circuit between the MAP Sensor harness connector and the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?

Yes

- Go To 9

No

- Repair the excessive resistance in the (K1) MAP Signal circuit.
- Perform the POWERTRAIN VERIFICATION TEST.Powertrain Verification Test.

7. (K857) 5-VOLT SUPPLY CIRCUIT OPEN




Turn the ignition off.
Disconnect the C1 PCM harness connector.

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.

Measure the resistance of the (K857) 5-volt Supply circuit from the MAP Sensor harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?

Yes

- Go To 8

No

- Repair the open in the (K857) 5-volt Supply circuit.
- Perform the POWERTRAIN VERIFICATION TEST.Powertrain Verification Test.

8. (K857) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND




Measure the resistance between ground and the (K857) 5-volt Supply circuit in the MAP Sensor harness connector.
Is the resistance below 100 ohms?

Yes

- Repair the short to ground in the (K857) 5-volt Supply circuit.
- Perform the POWERTRAIN VERIFICATION TEST.Powertrain Verification Test.

No

- Go To 9

9. POWERTRAIN CONTROL MODULE (PCM)
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the MAP Sensor and the Powertrain Control Module (PCM).
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the MAP Sensor and Powertrain Control Module connectors.
Search for any Technical Service Bulletins that may apply.
Were there any problems found?

Yes

- Repair as necessary.
- Perform the POWERTRAIN VERIFICATION TEST.Powertrain Verification Test.

No

- Replace and program the Powertrain Control Module.
- Perform the POWERTRAIN VERIFICATION TEST.Powertrain Verification Test.