P0107

P0107 - Manifold Absolute Pressure Sensor Circuit Low

For wiring diagrams, refer to.

• When Monitored: With the engine running and battery voltage greater than 10 volts.

• Set Condition: The PCM detects that the sensor input voltage is less than the minimum acceptable value.

• Always perform the pre-diagnostic troubleshooting procedure before proceeding. Refer to => Non-DTC Based Diagnostics. Pre-Diagnostic Troubleshooting Procedure

Test Step 1 - DTC is Active

• Diagnose any CAN C communication DTCs before continuing with this test.

• Diagnose and repair any system voltage DTCs before continuing with this test.

• Start the engine and allow it to reach normal operating temperature.

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.

• With the scan tool, select view DTCs.

Is the status Active for this DTC?

Yes

• Go to Test Step 2 => [ Test
Step 2 - 5 Volt Supply Circuit Voltage ]

No

• Refer to the checking for an intermittent DTC diagnostic procedure. Refer => Non-DTC Based Diagnostics.

Test Step 2 - 5 Volt Supply Circuit Voltage

• Turn the ignition OFF.

• Disconnect the MAP sensor connector.

• Turn the ignition ON.

• Measure the voltage of the 5 Volt supply circuit in the MAP sensor harness connector.

• The voltage should be 5.0 volts (plus or minus 0.1 volts).

Is the correct voltage displayed?

Yes

• Go to Test Step 3 => [ Test
Step 3 - MAP Signal Circuit Shorted to Ground ]

No

• Go to Test Step 8 => [ Test
Step 8 - 5 Volt Supply Circuit Shorted to Ground ]

Test Step 3 - MAP Signal Circuit Shorted to Ground

• Turn the ignition OFF.

• Disconnect the PCM connector.

• Measure the resistance between ground and the MAP signal circuit in the MAP sensor harness connector.

Is the resistance more than 100 ohms?

Yes

• Go to Test Step 4 => [ Test
Step 4 - MAP Signal Circuit Shorted to Sensor Ground Circuit ]

No

• Repair the circuit for a short to ground.

• Perform the PCM Verification Test. Refer to => Non-DTC
Based Diagnostics. PCM Verification Test

Test Step 4 - MAP Signal Circuit Shorted to Sensor Ground Circuit

• Measure the resistance between the MAP signal circuit and the sensor ground circuit in the MAP sensor harness connector.

Is the resistance more than 100 ohms?

Yes

• Go to Test Step 5 => [ Test
Step 5 - MAP Signal Circuit Open or High Resistance ]

No

• Repair the MAP signal circuit for a short to the sensor ground circuit.

• Perform the PCM Verification Test. Refer to => Non-DTC
Based Diagnostics. PCM Verification Test

Test Step 5 - MAP Signal Circuit Open or High Resistance

• Turn the ignition OFF.

• Disconnect the PCM connector.

• Measure the resistance between ground and the 5 volt supply circuit in the MAP sensor harness connector.

Is the resistance more than 100 ohms?

Yes

• Go to Test Step 9 => [ Test
Step 9 - 5 Volt Supply Circuit Shorted to Sensor Ground Circuit ]

No

• Repair the circuit for a short to ground.

• Perform the PCM Verification Test. Refer to => Non-DTC
Based Diagnostics. PCM Verification Test

Test Step 9 - 5 Volt Supply Circuit Shorted to Sensor Ground Circuit

• Measure the resistance between the 5 volt supply circuit and the sensor ground circuit in the MAP sensor harness connector.

Is the resistance more than 100 ohms?

Yes

• Go to Test Step 10 => [ Test
Step 10 - 5 Volt Supply Circuit Open or High Resistance ]

No

• Repair the circuit for a short to the sensor ground circuit.

• Perform the PCM Verification Test. Refer to => Non-DTC
Based Diagnostics. PCM Verification Test

Test Step 10 - 5 Volt Supply Circuit Open or High Resistance

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 5 volt supply circuit between the MAP sensor harness connector and the appropriate terminal of special tool #8815.

Is the resistance less than 5.0 ohms?

Yes

• Go to Test Step 12 => [ Test
Step 12 - PCM ]

No

• Repair the 5 volt supply circuit for an open or high resistance.

• Perform the PCM Verification Test. Refer to => Non-DTC
Based Diagnostics. PCM Verification Test

Test Step 11 - MAP Sensor

• Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the MAP sensor and the 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 related connectors.

• Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.

• Look for the data to change or for the DTC to reset during the wiggle test.

• Refer to any technical service bulletins that may apply.

Were any problems found?

Yes

• Repair as necessary.

• Perform the PCM Verification Test. Refer to => Non-DTC
Based Diagnostics. PCM Verification Test

No

• Replace the MAP sensor.

• Perform the PCM Verification Test. Refer to => Non-DTC
Based Diagnostics. PCM Verification Test

Test Step 12 - PCM

• Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the MAP sensor and the 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 related connectors.

• Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.

• Look for the data to change or for the DTC to reset during the wiggle test.

• Refer to any technical service bulletins that may apply.

Were any problems found?

Yes

• Repair as necessary.

• Perform the PCM Verification Test. Refer to => Non-DTC
Based Diagnostics. PCM Verification Test

No

• Replace the PCM.

• Perform the PCM Verification Test. Refer to => Non-DTC
Based Diagnostics. PCM Verification Test