Questions tagged [electronic-control-module]

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97 Infiniti J30 died out at stoplight, unknown electrical issue

my 1997 Infiniti J30 had the engine die at a stoplight. It turns over when I try to start it, but the engine won't start. The power windows were partly down, and they now won't go up, although the ...
user3573647's user avatar
2 votes
0 answers
2k views

Corsa C electric power steering ECU 12V power polarity

I need to know the power polarity of Corsa C Electric Power Steering ECU 12V power connector. I suppose the power is the right connector in following photo (it has 2 flat pins vertically aligned): If ...
Kozuch's user avatar
  • 1,305
8 votes
1 answer
458 views

Changing from two heated O2 sensors to a single O2 sensor

I'm going to be removing a Motorcraft 2150 carburetor in a 2.8L V6 and swapping it for a Ford CFI (and ECU) from a 3.8L V6. I've just recently pulled everything (ECU, throttle body, sensors, harnesses,...
Kevin Evans's user avatar
  • 1,196
4 votes
1 answer
1k views

Honda Hornet engine stalls

I have a Honda Hornet (CB600F) PC41 from 2007. It's the first model with EFI. The bike has an error that we can detect by observing the blinking pattern of the FI light: 2 long and 9 short flashes. ...
Tiago Alves's user avatar
6 votes
4 answers
14k views

What voltage does the ECU need?

I am tracing the operation of the ECU. I want to supply it with power but what is the ECU voltage input that I should supply?
David Kasozi's user avatar
4 votes
2 answers
482 views

How to reprogram an 86 corvette chip key to a new Electronic Control Unit

I just put a new Electronic Control Unit (ECU) in my '86 Corvette. My key seems to be giving the right code, as I get fuel to the rail and spark to the plugs, however, I don't get injector pulse, so ...
Hank Schmidt's user avatar
4 votes
1 answer
499 views

1997 Infiniti J30 is sometimes very slow to get power after a full stop, otherwise fine

My 1997 Infiniti J30 is sometimes very slow to get any power when I start going from a full stop. I can put the pedal to the floor, and it will slowly creep forward for 3-5 seconds, then suddenly ...
user3573647's user avatar
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
5 votes
2 answers
987 views

Find all modules supported in my car

I own a Mahindra Scorpio S10 (2015 model) and want to find out what modules are there in my car (ECM, TCM, Body Control Module, Suspension control module etc.) using an ELM 327 Bluetooth device. Can ...
Soumya Sen's user avatar
  • 1,511
3 votes
1 answer
2k views

Need urgent help - car cut out and instruments frozen and will not start

I have just broken down. I am safe. My car has suddenly cut out and my instruments are frozen. The car will turn over but it refuses to start. My fuel gauge is stuck as well. My engine is cold so I do ...
George's user avatar
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9 votes
1 answer
2k views

Sharp cornering is turning my Service light on for a second

Citroen C4 2005, Petrol Very rarely I happen to turn without braking properly and my forward momentum is quite high. In these situations I can feel the strain on my front wheels being very high. What ...
Иво Недев's user avatar
3 votes
0 answers
289 views

Overwhelming the Eng. management system, is there specific course of action to recover faster

Citroen C4 2005, Petrol, UK Yesterday I managed to overwhelm my car (for the second time I've been having it, first time was about half an year go). What happened was I was at a rather busy stop ...
Иво Недев's user avatar
6 votes
2 answers
1k views

Multimeter Voltage doesn't match ECU Voltage

I was messing around with electrical loads on my 98 Mazda 626 GF 2L today and noticed that the voltage I was reading at the battery with my multimeter, didn't match the voltage the ECU was report via ...
Robert S. Barnes's user avatar
2 votes
2 answers
117 views

Is it possible for the ECM to even attempt hitting the stoichiometric point if the pre-cat O2 sensor has failed?

If the pre-cat O2 sensor fails, the ECM is no longer able to determine whether the mixture is rich or lean. A pre-cat O2 sensor cannot fail silently, the CEL (check-engine light) will switch on. I am ...
Calaf's user avatar
  • 1,565
5 votes
1 answer
5k views

Bike currently running rich due to aftermarket exhaust, will adding an aftermarket air filter without any ecu work fix it

I have an MV Agusta Brutale 675 with a GPR Carbonox slip on installed. The air filter is stock and no work has been done on the ECU. My problem is: at this state it's running rich as one can smell un ...
glenrules7's user avatar
5 votes
1 answer
847 views

How do you compare two ECU maps

I want to update my ECU mapping on my motorcycle to the latest one supplied by the manufacturer, but I'd also like to see what changed before doing so. I downloaded what was on the bike ECU and also ...
Alin Purcaru's user avatar
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4 votes
1 answer
4k views

2006 Mazda 5 2.3L cranks but no start

I have a vexing problem and so far two mechanics and the dealer haven't been able to solve it. The car will crank and crank and crank but will not start. On the initial crank the fuel pump will come ...
corn's user avatar
  • 131
2 votes
1 answer
600 views

Ford Focus 1.4 ZETEC - possibly ECU problem?

I've a problem with a Ford Focus MK2 and looking for advice as I don't want to run into mad costs, here's a quick introduction on what happened: Battery went flat - as radio and lights were turn on ...
Adam Lesniak's user avatar
11 votes
3 answers
6k views

Car stalls and won't restart, but disconnecting the battery fixes it?

2005 scion tc 5 speed. 106xxx Yesterday driving home car stalls out on the highway and power steering goes with it. Battery and oil light come on and won't restart immediately. Dash lights still ...
Volktc's user avatar
  • 111
7 votes
1 answer
4k views

Is there a way to use a PC as an ECU for testing CANBUS Sniffer devices?

Is there a way to connect CANBUS sniffer device to a PC (computer) with CAN-H and CAN-L pairs and test the sniffer device? I want to convert my PC to an ECU emulator, connect a CANBUS sniffer device'...
Sencer H.'s user avatar
  • 215
3 votes
1 answer
2k views

Honda Brio AC Problem

My Honda Brio EMT 2015 model is having AC problems. The AC mechanic says the problem is in the ECM. Please enlighten me whether the BCM controls the AC or ECM does.
FEROZ KHAN's user avatar
2 votes
0 answers
226 views

Honda Civic Mk8 FK3 interfacing with ECU/body computer

I wanted to create a few improvements for a FK3 Civic, such as: - automatic door locking - automatic cornering lights For those, I need to be able to read few parameters from the car's computers: - ...
StanTastic's user avatar
21 votes
4 answers
23k 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
8 votes
1 answer
867 views

Do I have an ECU problem?

My 2001 Cabrio only idles. I had a mass/air error code, however I changed this and had no luck. I swapped one from a running VW, the other VW ran normally, but mine didn't. I had the shop read ...
schoolie1's user avatar
4 votes
1 answer
4k views

PCM Bench Testing

1997 Ford F350, 7.3, 2 wheel drive. PCM part number F6TF-12A650-AYG. OK the question is how to diagnose the PCM without codes due to the battery being dead? I have it out of the truck and was hoping ...
Michael 's user avatar
9 votes
2 answers
26k views

Higher than normal fuel consumption - What could be the cause?

My 1997 VW Golf 3 is over-consuming fuel, I use 10 liters for 45km, My mechanic ask me to change the automatic gear-box because it is not selecting gear above gear 3 I change the automatic gear-box ...
kossi's user avatar
  • 91
8 votes
2 answers
30k views

ECM vs. PCM vs. ECU?

Engine Control Module Powertrain Control Module Engine Control Unit Reading about them online, they seem to be the same thing, computers. So what are the spcific difference between them? Is the other ...
Jomar Sevillejo's user avatar
3 votes
3 answers
6k views

Could a modern car be modded enough to work without ECUs?

With enough time and skill sets, could a modern car be modded enough to work without microprocessors? Having machining skills and a fitted workshop, without buying a new motor block or transmission. ...
Sdlion's user avatar
  • 133
9 votes
2 answers
14k views

Keep Alive Memory (KAM)

What is "Keep Alive Memory" (KAM) and how is it different from RAM? From what I read over the internet, it is kept alive even after the ignition is OFF, but isn't that what a ROM is supposed to do?
Randy's user avatar
  • 93
12 votes
2 answers
649 views

Peculiar Interior Lighting Issue

Recently a friend of mine was driving a VW Fox (not new, I'm not sure what year but it was certainly 5+ years old) home in the dark with the lights on. Strangely, after a minute or two of driving all ...
Max Goodridge's user avatar
3 votes
1 answer
4k views

Response to 2001 Toyota Carolla vvt code 1349: what should I do?

I got a vvt 1349 code on my 2001 Toyota Carolla. I have noticed a sharp decrease in fuel economy. Some people have reported that the oil control valve may be causing the issue. The oil control valve ...
kilojoules's user avatar
6 votes
2 answers
5k views

What is the cost/benefit for reprogramming an ECU for a non-enthusiast?

As I've been learning more about cars, I keep hearing about how manufacturers are conservative with ECU settings. For someone who isn't into racing, but would like a bit better performance out of his ...
Matt's user avatar
  • 609
2 votes
2 answers
196 views

Mazda 3 2011 1.6 Lts Gasoline - ECU

I was wondering if its possible for a Mazda 3 2011 AT car to function without ECU? The reason I am asking is When I start the engine, the CheckEngineLight doesnot come at all When I took my car for ...
Youbaraj Sharma's user avatar
22 votes
1 answer
32k 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
  • 411
6 votes
1 answer
253 views

2009 Aprilia RSV1000 - Piggy Back ECU, Should I get one?

I have an Aprilia Tuono, 2009. It seems to run lean after putting an Akrapovic exhaust on it. It makes exhaust popping sounds on deceleration. My boyfriend said I need a power commander on it to ...
Ppoggio's user avatar
  • 1,487
7 votes
1 answer
25k views

How do I pull error codes from my Kawasaki motorcycle?

I have an FI light on my Kawasaki motorcycle that is 2002 or newer. How do I get the error codes so I can troubleshoot it?
DucatiKiller's user avatar
3 votes
1 answer
697 views

How is Dodge Spark Advance Controlled by the PCM if there is a Distributor?

The Chilton manual for the late 90s and early 2000s Durango and RAM says that PCM controls ignition timing and spark advance. I don't understand this, because these motors are equipped with a ...
JamesHoux's user avatar
  • 133
2 votes
1 answer
1k views

Determining active gear from OBD2 for Ford Fiesta

I am trying to to write an app which advises the driver to change gears and do some other driving quality assessments. For this purpose I need to determine the RPM and currently active gear in a ...
Mohammed Lokhandwala's user avatar
5 votes
2 answers
4k views

Letting Off Gas Forces Open Loop

I noticed something that seems a bit strange to me. Many times when I let off the gas the ECU drops out of closed loop into open loop for about a second. You can see on the graph that this happens ...
Robert S. Barnes's user avatar
4 votes
2 answers
349 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
5 votes
2 answers
909 views

How is barometric pressure related to emissions testing?

In the VW emissions cheating scandal, news reports say the following: According to the EPA, "the position of the steering wheel, vehicle speed, the duration of the engine's operation, and ...
David Walker's user avatar
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
0 votes
1 answer
1k views

Chiptuning for a car with DPF (Diesel Particulate Filter) is a bad idea?

I know that it is possible to disable DPF (Diesel Particulate Filter). I'm wondering how bad it could be to leave DPF (Diesel Particulate Filter) functioning and add a chip to a car?
Einius's user avatar
  • 327
0 votes
3 answers
971 views

Where are ECUs and for which tasks are they used? [closed]

ECUs are "Electronic Control Units". I've heard that modern cards have about 30 - 70 ECUs, but I couldn't find good sources for that. Do you have (citable) sources for where ECUs in modern cars are, ...
Martin Thoma's user avatar
2 votes
1 answer
286 views

Dealer can't program new ECU for 2001 Mercury Cougar because of transmission type

I brought the original ECM in to order a replacement, put it in myself, and then towed the car to Ford. Now they are saying they can't program it because the computer is for a manual and my car is an ...
Cassie's user avatar
  • 21
3 votes
1 answer
593 views

Reprogramming a Magneti Marelli Microplex MED604C

I'm interested in reprogramming a Magneti Marelli Microplex MED604C ECU for the ignition of an uno turbo, but I can't seem to find any documentation on this? I'm new to ECU remapping, and my ...
javawocky's user avatar
  • 145
4 votes
4 answers
8k views

Honda Civic 2000 DX, Check Engine Light Becomes On but Does Not Give OBD Code

On my Honda Civic DX 2000, the Check Engine Light (CEL) has been on for a while, so I brought the car to AutoZone to have the OBD code read, but I was told that no code is stored in the computer. ...
Toshimi Minoura's user avatar
5 votes
0 answers
690 views

1995 VM Jetta/Vento - ECU pinout for my car

I own a 95 Vento GL (Jetta for the american market), with an 1.8 8v, 90hp ADD model engine. The ECU for this model is marked with part number 037 906 021A. I have checked with VAG-COM software and it ...
Carlos Andres's user avatar
3 votes
3 answers
13k views

Live scan tool for OBD 1.5 GM transitional?

1995 S-10 Blazer 4.3L Vortec V6 (vin W) with Powertrain Control Module (PCM) 1995 was the OBD transitional year for GM. The PCM itself is OBDI, but the interface connector has the 16-pin D-style ...
Sparky's user avatar
  • 476
5 votes
2 answers
202 views

Why don't thermostats have a sensor?

One of the more common reasons of overheating is a stuck thermostat. One of the most common reasons for blown head gaskets is overheating. One of the most expensive vehicle repair procedures is head ...
amphibient's user avatar
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