Questions tagged [electronic-control-module]
The electronic-control-module tag has no usage guidance.
273
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ECU Diagnostic Port cut off and Check Engine Light disabled
I bought a used 92 Integra ZXi recently. I had starting issues so I took it to a mechanic. He found that the check engine light is disabled and diagnostic port from the ECU has been cut off. A very ...
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Are there plug-n-play ECUs?
I was just curious if there is such a thing as aftermarket plug-n-play ECUs that are compatible with a vehicle (have all the features the OEM ECU does) but also have some extra ones, such as maybe ...
- 6,633
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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 ...
- 8,956
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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 ...
- 39.1k
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3
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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 ...
- 335
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0
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'93 Cavalier ECU issue
I have an old cavalier that loses power to the ECU randomly. It can take many attempts to start again. I do not lose battery power to the lights or stereo.
If I flick the keys to the on position ...
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2001 Toyota 4Runner - ECU Drive Cycle Reset
After changing sensors that were bad on a Toyota 4Runner an emmissions technician stated that the vehicle needed to be driven "for awhile" before the "drive cycle" would reset the ECU to the new ...
- 33k
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2005 Toyota Avalon how to reactivate vehicle's ECU
2005 Toyota Avalon FOB stopped working, have a replacement. Now believe accidentally deactivated vehicle's ECU by turning ignition on/off 5 times during process of adding new FOB. So now, how can I ...
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Is it common for ECU's to maintain individual limit maps for each knock sensor?
Preamble
I'm in the process of interpreting my BMW M5's ECU binary with the aid of some nifty scripting and rather informative forum posts.
One of the things I've found is that there are knock limit ...
- 39.1k
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938
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Programming error Buick Enclave 2008
I just installed a brand new PCM on my Buick enclave 2008 gives me the P0602 code, the vehicle does not work, and some tell me it takes flasher PCM? I would like to know how flacher PCM (the stage) ...
Ed Sosthène
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Dash compatibility and the ECU
I have a Citroen C1 and it's a very basic model. It doesn't have a rev counter but I can add one because it has the cable and plug for it already exists, it's just not plugged into a rev counter.
What ...
- 201
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ODIS 5.0.6 diagnostic tool : how can I remove an option from a transformed vehicle?
We have a transformed car, a Bentley, which no longer has a motorized sunroof. The blind has also gone. However the car diagnostics exhibits a fault on the related, non-present devices and motors. We ...
user9147
1
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1
answer
3k
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MAF sensor output signal vs. RPM?
I read that the MAF sensor output voltage increases as RPM increases. The ECU uses this voltage to determine other things, like idle RPM, ignition timing, fuel injectors, etc. Where can I find the ...
- 251
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How are fuel injectors controlled?
I took the fuel injectors off of a wrecked Volvo 850 GLT 1996. I was testing them to see if they still worked by simply supplying voltage to them, and they do. I noticed that when I increase or ...
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Do I need a new ECU after replacing the transmission?
I replaced the transmission in my 2002 Lexus RX 300 about one month ago. The mechanics reprogrammed my ECU immediately, and they advised me to replace my ECU with a new one, because with the old ECU I ...
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Mazda Lantis 323 1997: OBDI or OBDII?
I'm still trying to figure out if my 1997 Mazda Lantis 323 GLX 1.8L DHOC Manual is OBD 1 or 2. It's supposedly similar to the Protege of the same year and it says on autozone:
In order to ...
- 15.7k
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1999 Grand Prix Issues
I bought this car used 3 yrs ago. Previous owners spun bearings in motor and replaced with 03. I had numerous issues with the cooling system and overheating since I purchased. I replaced water pump, ...
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1
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635
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Mazda 323: Does the EMU / ECU learn?
I have a Manual 97 Mazda Lantis 323 1.8L DOHC 16 Valve BP and was wondering if the EMU / ECU on it learns? Could unplugging the battery to reset it help some of my problems with erratic idle? I found ...
- 15.7k
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Scanning CANBUS [duplicate]
I am in search for a method of scanning the CAN on my car using a cheap ELM327 chip.
I can query the ECU (made by Denso) without issue, however when I attempt to set the ELM327 scanner into ...
- 1,945
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Fiat 500 Airbag Sensor
My Fiat 500, 2008, 1.2 Pop, 51Kw has had its front left side somewhat crushed.
The body has been fixed for the most part, but the electrician/mechanic tells us he cannot turn on the vehicle in order ...
- 141
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Error Message from OBD-II (7F 01 11)
I have been extracting OBD-II DATA from UART board (ELM327) on my TOYOTA INNOVA. It responded correctly few weeks before and gave all supported sensor values. But now, for every response, ECU responds ...
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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 ...
- 39.1k
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2005 Nissan Sentra - Pressing gas pedal has no effect - vent control valve
My car (2005 Nissan Sentra) had a problem for a while: gas spills out when pumping. I was lazy and did nothing about it. After a month or so, the car started to fail. At first it was only hiccups, but ...
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