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Questions tagged [electronic-control-module]

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10 votes
1 answer
3k views

A most intriguing cold-start misfire mystery

I'm trying to help a friend out with a CEL on his 2009 Merc GLK 280. Hooked it up to an OBD2 reader and retrieved a single code: P0300 - 'Random/Multiple Cylinder Misfire Detected', via the 'OBD ...
Zaid's user avatar
  • 39.2k
23 votes
1 answer
33k views

LTFT and STFT values are off and don't make sense

Car is a 2015 BMW M5 and it has an aftermarket CAI and a catback (slip on) exhaust. No other performance mods or tunes. About 6-7 months ago, I bought a Kiwi OBD-II reader, simply out of curiosity ...
DerStig's user avatar
  • 421
21 votes
4 answers
24k views

How does the car's ECU detect a misfire?

I was wondering what the specific mechanism used by car ECU's to detect misfires is, or are if there is more than one method.
Robert S. Barnes's user avatar
2 votes
5 answers
6k views

Gonna remove my Cat...issues with the ECU 😳?

The Cat. Converter on my 2005 Ford Territory SUV (245 cubic inch Twin Cam 6 Cyl)Australian Model is stuffed and I'm removing it (they cost the National Debt 💸)....I know I can be arrested / fined a ...
Hopeless's user avatar
2 votes
1 answer
393 views

Why buy an ECU with the highest version alphabet?

There is very little information online about the advantages of purchasing an ECU with the highest version alphabet - which means the most upgraded version. My question is - what kind of benefits come ...
ElectronicsNewbie's user avatar
12 votes
2 answers
4k views

Why do we need make-specific cables to read car ECUs?

I find it bizarre that the automotive industry has standardized the use of the OBDII protocol, yet most cars require make-specific cables in order to access the complete set of diagnostics and ...
Zaid's user avatar
  • 39.2k
6 votes
3 answers
1k views

Tapping into the on-board computer

I'm thinking of replacing my car's radio panel with a custom built Raspberry Pi device, something like this device. However, it's usefulness would be much larger, if I could get information from the ...
Petr's user avatar
  • 235
6 votes
1 answer
5k views

ECU replacing procedures

In a Renault Laguna 1.6 2003 , the ECU got damaged physically (the connector went off ) so i have to replace it with another one ( used ECU ) , I've read that I will need to disable the Immobilizer ...
Chebhou's user avatar
  • 363
5 votes
3 answers
37k views

What does it take to program a used ECU?

I own a Mazda MPV 2000 with a faulty ECU. The vehicle has an immobilizer. It will not start with the former ECU. It floods the engine with fuel. After extensive diagnostics on the vehicle and the ...
ElectronicsNewbie's user avatar
5 votes
1 answer
767 views

How to calculate fuel consumption and CO2 emission on flex fuel cars using OBDII data?

Here is the thing: I'm trying to estimate the fuel consumption of cars using OBDII data. It's quite simple if we can treat each fuel and its stoichiometric air fuel ratio separately, but when it turns ...
Higor Anjos's user avatar
4 votes
2 answers
357 views

Fuel Economy Gauge Modification

I have a little digital screen in my dash that re-evaluates my average fuel consumption (L/100km) every thirty seconds. How can I modify this to increase the reporting frequency? Preferably, at least ...
voices's user avatar
  • 366
4 votes
1 answer
6k views

96 Impreza ECU Pinout

I'm still working on getting this EG33 into a 96 Impreza. I have received some wiring harness diagrams, but am unable to match them to the ECU which is in the car. I'm wondering if what I have are the ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
4 votes
2 answers
15k views

Do I need to reprogram ECU when adding custom Air filter

I was thinking of replacing the air filter of a bike into a custom free flow filter. I understand that I have to mod the exhaust to free flow as well to accompany the increase in exhaust due to the ...
Shobin P's user avatar
  • 8,936
4 votes
3 answers
3k views

Will vtec engage without a factory released VTEC ECU when swapping to VTEC engine?

I replaced my honda civic d15z4 engine with a d16A. Apparently, VTEC engages at 5500rpm on these engines. My car is still practically standard, I'm not sure if it does switch over, if it does, the ...
pythonian29033's user avatar
3 votes
2 answers
23k views

Does disconnecting the battery reset on-board memory?

Will disconnecting my car battery reset the on-board memory or do I have to manually erase it to remove error codes? I ask because I have a faulty electrical system that throws gas leak errors and I ...
the_prole's user avatar
  • 393
2 votes
1 answer
1k views

Considerations for a successful VW 2004 Jetta 2.0L engine swap in place of a 1.6L engine

Vehicle make: Volkswagen Model: Bora Year: 2004 Issue: Swapped the 1.6L for a 2.0L. No programming of the ECU was necessary neither was a change of ECU necessary until vehicle started misbehaving - ...
ElectronicsNewbie's user avatar
1 vote
0 answers
99 views

I have a seemingly very hard wiring problem to solve

Further to my last question : I have a Renault Clio 1.2 2010 that keeps coming up with a P0638 (Throttle Actuator Control Range/Performance) error (according the the OBD2 device I have). One thing I ...
Mongus Pong's user avatar
1 vote
4 answers
35k views

Does a replacement ECU need programming to the car?

I've got a 2004 Toyota Avensis with the 1.8 petrol engine that needed an ECU replacement or repair. I received £700 invoice for the used ECU which I doubt it, the guy was saying something about ...
Laurence's user avatar
0 votes
1 answer
441 views

ECU help required [closed]

Can someone provide guidance to me about the engine swap from a D15Z4 to a D16Y4 in my 1997 Honda Civic? Can I use the old ECU with new engine? Do I have to buy a new ECU with the new engine?
user22583's user avatar