Guide To P0107 OBD Error Code Solutions

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Are you experiencing engine hard starting and long cranking times? Is there black smoke coming from tailpipe and reduced fuel economy? All these along with Malfunction Indicator Light can be the problems indicating OBD code P0107 being stored in the PCM.

OBD-II Code P0107 is defined as a Manifold Absolute Pressure Sensor/Barometric Pressure Circuit Low Input

The Manifold Absolute Pressure (MAP) Sensor/Barometric Pressure Sensor is used to measure the rise and fall of the air pressure inside the Intake Manifold System. This provides critical data needed by the Powertrain Control Module (PCM) to control the Air to Fuel Ratio, the Ignition Spark Timing and many components of the Emission Control Systems.

OBD Code P0107 sets when the voltage to the PCM from the MAP/Barometric Pressure Sensor Circuit stays under 0.5 volts for 10 seconds or more when the values from the Throttle Position, RPM and Oxygen sensors are changing.

What causes the problem of Manifold Absolute Pressure Sensor/Barometric Pressure Circuit Low Input?

• Faulty, damaged or dirty MAP sensor
• Open or short in the signal circuit
• Open or short in the 5 Volt reference circuit
• Ground circuit open or shorted
• Faulty PCM that might require reprogramming

1. Diagnostic Tools - Always seek professional help and use high grade diagnostic tools to detect and diagnose any OBD error. Buy quality diagnostic tools now!
2. Mass Air Flow Sensor - Faulty MAF sensor will cause problem with the air intake system, fuel delivery system and the engine performance. Replace damaged sensor now!
3. Throttle Position Sensor - Faulty TPS can cause loss of engine power and acceleration, reduced fuel economy and engine stalling and not starting. Buy new TPS form us.
4. Catalytic Converter - Faulty catalytic converters can cause increased emissions and can get damaged by overheating. Replace damaged catalytic converters immediately.
5. Manifold Absolute Pressure Sensor - Damaged MAP sensor will directly affect the engine’s performance and will cause reduced fuel economy and engine misfires. Replace faulty MAP sensor immediately.
6. EGR Valve & Parts - Faulty Exhaust Gas Recirculation System and parts can’t regulate the flow of exhaust gas properly, causing increased pressure on engine and resulting in misfires and stalling. Replace faulty EGR components immediately, if found faulty.
7. PCV Valve - Faulty PCV valve can increase engine pressure, failed oil seals and gaskets, and engine oil leakages. Replace faulty valve now!
8. Throttle Body - Check for faults in the throttle body that can cause engine performance issues as well as failed systems due to wiring and connection errors. Replace faulty components now!

Following are the problems or symptoms that can be an indication of OBD Code P0107 error that is being stored in the PCM;

Common Symptoms

• Engine Hard to start
• Long cranking times
• Sputtering/missing
• Black smoke from tailpipe
• Reduced fuel economy
• Engine dying intermittently
• MIL(Malfunction Indicator Lamp) illumination

Use an OBD scan tool with the Key on and engine running, monitor the MAP sensor voltage. If it is reading less than .5 volts, turn engine off, unplug the MAP sensor and, using a DVOM (Digital Volt/Ohm Meter) check for 5 Volts on the 5 Volt reference circuit.

Check for the reference voltage at the PCM connector, if there is no 5 volts on the reference circuit. If it is present at the PCM connector but not the MAP connector, repair the open in the reference circuit between the PCM and MAP harness connector.

If 5 Volt reference is NOT present at the PCM connector, check powers and grounds of PCM and repair/replace as needed.

If 5 Volt reference is present at the MAP connector, jump the 5-volt reference circuit to the signal circuit and check the MAP voltage on the scan tool. If the reading is between 4.5 to 5 Volts, replace MAP sensor. If not, repair open/short in the signal circuit wiring and re-check.

If all appears okay, perform a wiggle test. Start engine and manipulate the harness, connector and tap on the MAP sensor. Note any changes in voltage or engine speed. Repair connector, harness, or sensor, if found faulty.

If the wiggle test checks out, use a vacuum pump to draw a vacuum on the MAP sensor vacuum port. Note that the voltage should decrease as you add the vacuum. With no vacuum, the MAP sensor reads approximately 4.5 volts. If there is no change in MAP sensor reading on the scan tool, replace MAP Sensor.

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Use an OBD-II scanner to diagnose P0107 error. A qualified mechanic then resets the OBD-II fault codes and road test the vehicle to see if the code comes back which can be observed by watching data live on the scanner while driving. If the code returns, the mechanic needs to do a voltage test with the key on using a Multimeter and verifying there is 5 volts input to the MAP sensor and a minimum of 0.5 to 1-volt output with throttle closed.

With the engine running at idle, it should have minimum 1 volt on the input to the ECU and then increase with engine speed and load. If the voltages are correct and within the acceptable range, then it is most likely a bad MAP sensor that needs replacement.

Common mistakes when diagnosing the P0107 code

Diagnostic errors usually occur due to not following the procedure properly. Always follow the test procedure in the diagnosis to ensure there is the correct voltage to the sensor and from the sensor to the ECU.

The technician must verify the voltage output of the MAP sensor is in the correct range and fluctuates with the engine speed and has proper voltage. Idle voltage is normally between 1 to 1.5 volts and full throttle is usually around 4.5 volts.

Don’t replace the MAP Sensor or ECU unless it is clearly at fault as these are hefty expenses. Always check for faulty wiring and connectors first.