Skip the auto shop - Our mechanics make house calls

Q: What do I do when the MAF isn't creating enough ground to the ECM module?

asked by on

Okay so I left i morning to go to work and my truck lost power and wouldn't accelerate then when it slowed down to s stop it died and wouldn't start again. The first thing I thought it was, is the fuel pump. But that wasn't the case had a fair amount of pressure going to the engine. Then ran a scan on it and got the code p0102 for the maf. Then we tested the connection, I read on the internet that the ground to the emc is suppose to be close to 12 volts and it wasn't pushing more than 2.4 volts and realized there was a bad connection to the ground from the emc module. Where should I start to fix this problem? Also it would start but it is hard and it runs really erratic and then stalles out

My car has 182000 miles.
My car has an automatic transmission.

A: Hi there. First, check the harness connecti...

Hi there. First, check the harness connection on the sensor for any burned or corroded pins. That will cause a restriction and make the power drop. If the harness is good on the plug end, then disconnect the harness from the computer with the battery disconnected, and check resistance on the wires to locate the power wire from the MAF sensor to the computer. Then, check the other circuit on the MAF sensor harness for a ground and get a reading.

The resistance should be no more than 1.5 ohms. If the resistance shows a lot more, then there is a break in the wire and the harness needs to be fixed or replaced. If the readings are good, then there is a problem with the ECM and it needs replacing due to a burned circuit inside the computer.

If you need further assistance troubleshooting your vehicle, then seek out a professional technician, such as one from YourMechanic, who can come to your location to assist you with the ground issue to the ECM module.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: After I have driven awhile (basically not the first few times that I apply the brake) I hear a grinding souund

You may be hearing just the brake pad noise that is the material in the pads grinding on the rotor. This is normal for most metallic pads. The pad material is made with small metal fibers mixed in with the...

Q: The main computer box is loose is there anyway to fix it without buying a new one

Try and get long large wire ties to hold it together. If it does not work then you will likely have to replace the ECM. If you would like to get this checked out, a technician from YourMechanic can come...

Q: Rough idle after replacing Mass Air Flow Sensor - trouble codes P0171 and P0102

The P0171 refers to a possible lack of fuel pressure, a leak in the intake air system, or a possible vacuum leak. The P0102 also leans towards a leak in the intake air system. It is possible that there is...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.