Symptoms Of A P0107 Diagnostic Trouble Code
Your vehicle's fuel injection system is a speed density type (which also means it does not use a mass air flow (MAF) sensor).
This type of fuel system depends on engine load and engine speed info to inject the correct amount of fuel into the engine's cylinders.
So when the PCM receives a MAP signal that doesn't square with actual engine operating conditions... you'll feel it in more ways than one.
When the MAP sensor fails, you'll see one or more of the following symptoms:
- Check engine light (CEL) shining nice and bright.
- DTC P0107 is present.
- Your car or mini-van fails the state mandated emissions test.
- Bad gas mileage.
- Hard start and/or extended cranking time (after shut off).
- Black smoke coming out of the tailpipe.
- Hesitation when accelerating your car or mini-van.
Let's find out what are the common causes of a P0107 DTC, in the next subheading.
Common Causes Of A P0107 Trouble Code
The most common causes of trouble code P0107 are:
- A bad manifold absolute pressure (MAP) sensor.
- A broken MAP sensor connector.
- A problem in the sensor 3 or 4 wires. Specifically, a short in one of them.
- Engine with very low or uneven compression (in other words- a worn out engine).
- A fuel pump that's failing and not supplying enough fuel volume.
- A timing belt that's not synchronized correctly.
- A bad PCM.
Although extremely rare for this to happen... a bad PCM can also cause a false P0107 trouble code.
Troubleshooting DTC P0107
The key to diagnosing the P0107 Manifold Absolute Pressure (MAP) Circuit Low Voltage OBD II diagnostic trouble code (DTC), that's lighting up your check engine light, is keeping in mind that the manifold absolute pressure (MAP) sensor (MAPS) is stuck producing a low voltage signal.
If you recall, from the previous page:
- The MAP sensor's voltage signal increases when the throttle plate opens and manifold vacuum is lower.
- The MAP sensor's voltage signal decreases when the throttle plate closes and manifold vacuum is higher.
So when a DTC P0107 is registered, the PCM sees the MAP sensor reporting a high intake manifold vacuum pressure (and thus receiving a low voltage MAP signal) when it knows, via other sensor inputs, that it should be reporting a lower vacuum pressure (and thus higher voltage signal).
Confused yet? Don't worry, the MAP sensor test is very, very easy. By manually testing the MAP sensor with a multimeter, you and I can find out if it's truly fried or not.
Here are the links to the MAP sensor multimeter tests I've written:
- 3-wire MAP Sensor Test:
- MAP Sensor Diagnostic Test Chrysler, Dodge, Plymouth (at: easyautodiagnostics.com).
- 4-wire MAP Sensor Test:
- Chrysler 4-Wire MAP Sensor Diagnostic Test (at: easyautodiagnostics.com).
If this info saved the day, buy me a beer!