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How do you detect a bad brainbox

Malfunctioning brainbox

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Mitsubishi lancer 2008 emitting black smoke wit high level fuel consumption effort trying fixing prove abortive, they all say is brainbox ,i search for but couldn't find the one that will match it

If you've had it professionally diagnosed and you they say you need a new ECM/PCM computer (it's not called a brainbox) search online for a rebuilder. They'll be a fraction of the price of new and even used. Just a note though, it's rarely the ECM/PCM. Black smoke means it's running too rich, so somewhere the computer is giving it too much fuel. That's usually caused by a bad engine coolant temp sensor or leaking fuel injectors. I think you're trying to replace the most expensive part first. Never a good way to approach car repair.

Jun 28, 2017 | Mitsubishi Cars & Trucks

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What does an air bag brainbox do?

Sends a interrogation signal to the airbags to see if the return is withing acceptable parameters if not it disables the airbags and a light comes on on the instrument cluster
when an impact is detected and exceeds the allowable readings sends a detonation signal to the airbags

Feb 16, 2017 | Cars & Trucks

2 Answers

Can a weak brainbox cause fuel to be mixed with engine oil

Why do you think there is fuel in the oil? Does it smell like it? Or is the dipstick level climbing? Tell us more about the problem and what you have already tried/done. When was the car last fully serviced? Poor maintenance is no excuse for poor running.

Mar 30, 2015 | Lexus Cars & Trucks

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Where is brainbox located in mazda millenia 96

If by brainbox you mean ECU, it should be under the left side of the dashboard, typically behind a panel.

Oct 17, 2014 | Cars & Trucks

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Hello, i got a nissan sentra GXE 2002 make car. The brainbox got bad, and the electrician got a new one and fix it, it did not start it, so he removed one of the IC and added it to the previous brainbox,...

The EMS (engine management system) is essential for the car to run properly, and for it to be safe to drive.
It sounds like you have the wrong EMS, it was wrongly installed or something like that. To be honest, your best approach would be take the car to a Nissan Approved garage and get them to look it over. Working on these cars is not like the old days - you need a laptop with the right software, not just a socket set. If you carry on driving, you have no idea what other damage you are causing to the engine, and this could end up costing you $$$.
Good luck.

Aug 06, 2014 | Cars & Trucks

1 Answer

Electronic fuel control

You may have a bad mass airflow sensor, throttle position sensor, crank sensor or a bad ecm (brainbox). You can take it to autozone, advance auto or orielly's and they will hook it up to their diagnostic tester for free.

Jan 27, 2013 | 1988 Chrysler Fifth Avenue

2 Answers


Majority problem on the ECU is the leaky electrolytic capacitors.
If you has the time to do soldering then you can fix the brain box for under $15 vs $120+ for a use one.
Just open the cover and look for damage (over-heated + leaked) capacitors.

Jul 28, 2011 | 1998 Mazda 626

1 Answer

Hello. My name is bimbo.I have an Audi 1.8GT A4 2001 model. The problem is that, the car will give me a starting sound as if ,it will sound and will not start.When i touched the brainbox, it was so hot as...

The easiest way to check for a bad brainbox is to pull the codes

You will need to procure an OBD-II scan tool. You can purchase this or perhaps rent/borrow one. Autozone has a tool rental program if I recall correctly and may be able to provide you with one.

There is an OBD-II diagnositics port under the dash near the driver's door. There will most likely be directions with the tool and/or provided by the person you got it from.

If you didn't get instructions:

1. Plug it in and turn it on if it does not automatically do so.

2. Start the engine or turn on the electrical system, depends on what the scanner directions say

3. Press the button to read the codes if it does not do so on it's own

4. Scroll through the codes and write them down. OBD-II does have a list of standardized codes, but there are also specific ones for your make of car. There are pending codes which should be noted and fault codes which are the big problems.

5. Kill the engine/electrical system and remove the tool.

Jul 20, 2011 | Audi A4 Cars & Trucks

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P134, p0141, po300, po130 and po135. 2005 Sunfire.

Given that most of the trouble codes are for the O2 sensor, I think I would change it. The multiple misfires could be because of improper fuel/air mixture caused by a bad sensor. Disconnect the negative(-) battery terminal then change the sensor. Disconnecting the negative(-) should reset the computer and allow the fuel/air mixture to return to default allowing the engine to start.
P0130 - O2 Sensor Circuit Malfunction (Bank 1 Sensor 1)
P0134 - O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
P0135 - O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
P0141 - O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
P0300 - Random/Multiple Cylinder Misfire Detected

Jun 16, 2010 | 2005 Pontiac Sunfire

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