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2
votes
3answers
44 views

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

ok so 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, ...
1
vote
0answers
15 views

'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 ...
1
vote
1answer
43 views

2001 Toyota 4Runner - ECU Drive Cycle Reset

After changing sensors that were bad on this 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 ...
1
vote
1answer
35 views

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 ...
5
votes
2answers
59 views

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 ...
3
votes
1answer
15 views

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 ...
6
votes
1answer
64 views

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 ...
0
votes
1answer
91 views

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 ...
1
vote
1answer
565 views

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 ...
3
votes
1answer
96 views

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 ...
2
votes
1answer
81 views

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 ...
3
votes
1answer
234 views

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 ...
0
votes
0answers
145 views

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 ...
4
votes
2answers
748 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 ...
2
votes
0answers
271 views

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 ...