Skip the auto shop - Our mechanics make house calls

Q: Issue with the scanner connection to the EC

asked by on

2000 Blazer. I tried to use my scanner and it was connected with no problems but it wouldn't communicate with the EC. What could be the problem?

If you’ve got a scanner and it’s not communicating with the computer system, there are really only three possible issues if your scanner has actually worked.

The first possible issue is with wiring pins, specifically in the connector where you plug it in. If the data link connectors are bent they will be unable to operate. Check to make sure that none of them are bent.

Another probably issue is that you’ve got a wiring problem in the car somewhere and it’s shorting the system out. It could be a bad MAF sensor or the itself wiring that is connected to the MAF sensor.

Lastly, the third possibility is a bad EC. If the main computer goes bad, you can’t communicate with it. If this is the case, you’ll want to hope that you can find the wiring short so that it will be able to communicate.

If you need assistance with these checks, contact a certified mechanic who can find the root of your electrical problems and fix it accordingly.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: Can I reprogram my old computer module or does it have to be done at a dealership?

Hello and thank you for contacting YourMechanic. If the computer to the vehicle has lost its memory, then you can have it flashed (reprogrammed). If the computer had a power loss and a code for P1684, then you would need...

Q: After driving I can smell hot wires, no dash lights on, but I am concerned that wires are touching something hot or shorting.

If you feel that you're smelling burning wires, I highly recommend getting your vehicle's electrical system inspected by a qualified professional using multimeters and diagrams. They would measure things such as voltage, resistance, current and other necessary factors needed in...

Q: Epc Light & Sensor

I'm curious if there are any fault codes stored in the engine's computer. The mass air-flow meter or sensor is not the "EPC" sensor. If the vehicle is not running properly with the new mass air meter, there may be...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...