OBDII DTC trouble code of P0068 is a generic check engine light code that is telling you that something is wrong with either your Manifold Absolute Pressure (MAP) Sensor correlation. This means that either your MAP sensor or your Throttle Position Sensor (TPS) are sending incorrect information, which is causing your check engine light to turn on.
Your Sebring may buck or hesitate, or even have black smoke coming from the tailpipe under load. Other symptoms can include surging or erratic idle, and your gas economy will plummet because of the sensor problems. Today I’ll be showing you how to test a Chrysler Sebring MAP sensor in a 2004 Chrysler 2.4 liter Sebring with a VIN code of C.
This is the non High Output version of this engine, which shares many similarities with the original 1995-1999 Mitsubishi Eclipse non turbo 420A engine, as well as the engine found in the Dodge SRT-4.
Symptoms of OBDII DTC P0068
- Black Smoke
- Surging
- Tach needle jumps around
- Bad fuel economy
- Inconsistent idle
The specific trouble with the OBDII P0068 code is Throttle Position Correlation DTC. More than likely this code means that there’s something wrong with your MAP sensor, or there’s leaks in your plastic intake manifold. Other OBDII trouble codes may also accompany this one, like P2074, P0129 which all can be caused by a faulty MAP sensor.
Other trouble codes can also be P0107 for MAP sensor voltage too low, or even P0108 for MAP sensor voltage too high. Either way, your MAP sensor must be tested in order for you to get rid of the P0068 trouble code.
What causes the P0068 trouble code?
Over 2000 RPM the PCM inside your Chrysler sees a discrepancy between the amount of air that’s entering the engine, and the amount of air that should be entering the engine. Because your 2.4 liter engine is run on speed density, this can confuse your ECU into thinking there’s more or less air than what’s actually being ingested by your engine.
This triggers your OBDII Malfunction Indicator Lamp (MIL) into lighting up bright orange to inform you of a stored OBD-II DTC.
The part number for this three wire MAP sensor is Chrysler part number 4896003AA, or 4896003AB. Failing this however, you can also use the universal interchange part number of MS49. The non High Output version of this MAP sensor can be used, but you will need to modify the MAP sensor connector clip for a secure connection.
Things to check first – Leaks
Before you buy any parts or spend a dime, you can do some investigate work to see what the problem could be. Even if you can’t find or source the problem, you may be able to eliminate other causes or simplify your repair job.
Your 2.4 liter Chrysler engine utilizes a plastic intake manifold, which can crack or leak over time as it’s exposed to very high temperatures in your engine bay. A simple way to check for leaks and eliminate the possibility of unmetered air entering your engine is to use a spray bottle with soapy water.
You can also check other items, such as your PCV valve or vacuum hoses to see if maybe one of them has sprung a leak. Take some time now to feel around your engine bay and don’t be afraid to use soapy water sprayed onto the intake hoses to see which might be bubbling. This is a huge part of learning how to test a Chrysler Sebring MAP sensor to fix the P0068 trouble code.
Testing your Chrysler Sebring MAP sensor for Power
Your Sebring Manifold Absolute Pressure (MAP) Sensor is powered by your ECU. For this part of our how to test a Chrysler Sebring MAP sensor DIY test, you will need to use a multimeter to test the ENGINE side of your MAP connector.
Locate your MAP sensor and unplug the three pin weatherproof connector. You will be measuring the MAP harness on the ENGINE side, after you put the key into the ignition and turn the key to the “ON” spot. Do not start your engine.
The wire you need to test on your Chrysler MAP sensor is PIN A, which should be a purple wire with white stripe. Using your multimeter, ground the black lead and gently touch the front of PIN A with the red lead. You should have close to 5 volts here at this wire. If you don’t have 4.5-5 volts at this wire, something else is wrong and is causing your MAP sensor to fail due to lack of power.
The next part of the how to test a Chrysler Sebring MAP sensor guide is to test for ground. The low reference ground wire is PIN B or the middle wire of your Chrysler Sebring MAP sensor. This wire should be black with a blue stripe through it. Measure this wire for the low reference, and if you have a ground signal here, your MAP sensor is being powered.
Testing your Chrysler Sebring MAP signal
The last leg of the how to test a Chrysler Sebring MAP sensor DIY guide is to test the Chrysler MAP sensor for signal. This is done through PIN C which is a green wire with a red stripe. Reconnect your MAP sensor, and backpin PIN C so that a paper clip is sticking out from the back of the MAP connector.
This way you can test the circuit without disconnecting the MAP sensor, which is what you want to do. Using your multimeter in volts mode, measure the terminal while backpinned for voltage at this pin.
Turn the key to the ON position but don’t start the car. You should have 3.8 to 4.0 Volts DC at this wire with the engine shut off. Now turn on the engine and your voltage should drop to 1.2-1.5 volts. Try to depress the accelerator and look at how the signal is behaving. There should be no dips or spikes as you increase engine speed.
If any of these tests do not fall within our how to test a Chrysler Sebring MAP sensor guidelines, replace your Sebring MAP sensor and clear your P0068 trouble code using a scan tool. You now know how to test a Chrysler Sebring MAP sensor and clear your P0068 OBD-II Check engine trouble code! Have any questions? Leave them for us below.
