Questions tagged [ecu]

Electronic Control Unit. The vehicle computer which controls the functions of the engine based upon input from various sensors. The ECU adjusts different aspects of the engine. PCM, PCU, and ECM can all be considered synonyms.

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457 views

Mk4 Astra judders, runs hot p0420 p0170 p1130

I have a Mk4 Astra 1.8 petrol 2002 130k Miles. When starting the idle speed revs up & down, it judders when driving the first 500metres. Plenty of oil, water was a bit low. During a 2 hour ...
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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 ...
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172 views

Relation of VIN of a car with emission norms of a country it is sold

A VIN of a car determines the country of manufacture. So if a car has a VIN of Canada (CARB emission standard) and is sold in India (BS-IV emission standard), will the car comply with BS-IV standards? ...
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Cannot Access ABS-control-unit with ODB2-adapter

I have an ODB2-Bluetooth-Adapter(link) to access the ODB-Protocol with my android-smartphone. It is basically working. The app that I use ("Torque") can connect to the ECU, shows me different values ...
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SilLabs OBDscan can't connect to Alfa 147: latency too high!

I have an OBD Scan tools built around the Silicon Labs CP210x chipset, but I can't get it to connect to my car at all. When I connect the scan tool to my laptop USB port I have a driver installed and ...
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383 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?
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Shouldn't my post-cat O2 sensors (lambda probes) be reporting varying numbers?

On my 2002 BMW E46 330Ci, I've been getting error codes 202 Lambda regulating limit Bank1 and 203 Lambda regulating limit Bank2. Here's the angry sensor readings from the INPA software: I understand ...
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Is a bad AFM (Air Flow Meter) a likely cause for fuel cut at high RPM and poor performance at low RPM?

Edit: I answered my own problem, the solution was the AFM (see full answer below). This question is for the same engine and the same car as in the following question: Likely cause of poor performance ...
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1answer
686 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 ...
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Cause of limp mode in Vauxhall Astra which ECU code is relevant?

The engine now runs ok when started cold, but if the weather is very hot or it's started when warm it goes into limp mode, whereby the orange spanner symbol comes on and max acceleration is only 1/3 ...
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2003 Honda Accord not responding to accelerator

2003 Honda Accord, a few months ago we started having problems with it. All of a sudden the CEL and traction control light came on with the d4 light blinking. Also it would idle low, shift hard, and ...
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245 views

engine will not start - suspect immobiliser

This is my first post on this site. It looks good and the site has a good feel to it so I have some high hopes! So, I have a 2005 OPEL corsa 3 cyl. and one day it just stopped. I will not bore you ...
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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 ...
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1answer
428 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,...
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717 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. ...
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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?
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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948 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 ...
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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 ...
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1answer
613 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 ...
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537 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 ...
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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 ...
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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'...
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209 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: - ...
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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.
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785 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 ...
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1answer
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 ...
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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 ...
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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. ...
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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?
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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 ...
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1answer
3k 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 ...
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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 ...
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162 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 ...
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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 ...
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1answer
205 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 ...
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16k 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?
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1answer
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 ...
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2answers
3k 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 ...
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2answers
251 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 ...
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846 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 ...
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1answer
4k 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 ...
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1answer
738 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?
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935 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, ...
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1answer
195 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 ...
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1answer
496 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 ...