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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Dodge Grand Caravan Won't Turn Over

I have a Dodge Grand Caravan 2001 that was having running rough and the exhaust smelled like raw gas. I replaced some sensors and that didn't work so I decided to replace the ECU. I got a new ECU from ...
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Mitsubishi mirage Code P1590 A/T torque reduction req. comm

The check engine light on my mitsubishi mirage is on and upon scanning the codes, I am getting the following codes: U0131 EPS CAN timeout U0101 T/M CAN timeout U0121 ABS/ASC CAN timeout P1590 A/T ...
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How to find schematics of a PCB?

I have the following ECU Accent 2012 1.4L, 4-Cyl, 4-speed transmission board in the picture, I have searched for the information written on this product but couldn't find any schematics. Is there a ...
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I wanted to change my ecu, will buy used ecu and reprogram on my mercedes c180 w205

I wanted to change my ecu, will buy used ecu and reprogram on my mercedes c180 w205 is that possible? How do I go about it
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Subaru Forester - petrol coming out unlit in bursts out exhaust. Ideas on what could cause it?

I've got a Subaru Forester '02 2.5L that I push kind of hard off road on New Zealand beaches. I had a near dead battery recently so bought a new one but on replacing it I must have wiped the ECU ...
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What are the factors that rev hang depend on? Does rev hand depend on the engine load?

I know that rev hangs are intentionally introduced to modern vehicles that operate on electronic throttle bodies, by programming the ecu to close the throttle valve slowly (in gasoline engines) even ...
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42 views

Does car ECU subtract atmospheric pressure from MAP reading

In calculation of MAF (g/sec), Does the ECU subtract local atmospheric pressure (baro sensor reading) from Manifold Absolute Pressure (MAP sensor reading) to determine the actual air mass entering the ...
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OBD2 Mode 3 No Response

I am communicating with my car OBD2 port with STM32 microcontroller board and got success to get response to basic PIDs such as Service 01 and 02 and even got response of service 09 PID 02 to get 17 ...
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How to open Ford PCM

I have a 2008 Sport Trac with a dying PCM whose symptoms overwhelmingly suggest that it has one or more bad electrolytic capacitors. It's likely to be an easy repair... assuming I can figure out how ...
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24 views

Turboing a 4B11

I own a 2015 base model lancer with the 4b11 and I want to turbo it so I’m going to get another 4b11 and put all my mods on it and when it’s done pull my stock engine and put the built one in my ...
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ECU after engine swap

I have a 2005 wrx, previous owner engine swapped it to the STI short block (EJ257) so now it’s a 2.5 instead of a 2.0, i’m trying to buy an accessport for it, but i don’t know which one to get because ...
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Diagnose misfires before the ECU codes them

My 2007 Mazda 6 ran rough for months before the check engine light finally came on and the ECU set a code for misfires on cylinder 1. Replacing the coil on that cylinder fixed it and it was running ...
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31 views

What kinds of tuning can ruin a car's ability to pass emissions testing?

Suppose I want to tune a car for performance, like doing an ECU re-map for a Toyota Supra. Could this affect the car's ability to pass emissions testing? If so, how? And in general, what kinds of ...
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Steady, low voltage on pre-cat O2 sensor while idling, but voltage increases upon revving

To test my pre-cat O2 sensor, I unplugged its connector from the ECU and stuck a voltmeter’s probes into said connector. When I let my engine idle, my voltmeter shows a steady low voltage, oscillating ...
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33 views

VW Jetta 2000 ECU swap

I've read the forums and my question isn't answered. I have swapped my 2.0 to 1.6 in my 2000 Jetta still using my 2.0 ecu for the 1.6l engine. Is it safe? How will the fuel economy be and any effects?
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How to find out if your ECU has been reflashed?

Vehicle 2010 Audi A4 Quattro, 2.0L TFSI engine, automatic transmission, 180,000 km. Recent History Friend bought this car used 2 months ago from a private party. The check engine light comes on with a ...
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50 views

ECU tuning exhaust - why?

When a sports exhaust is fitted to a car apparently a re-tune of the ECU is required. For a simple example consider a regular unmodified normally aspirated petrol car which then has a sports exhaust ...
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I have a 2000 ford contour 2.0 runs fine but will not get any faster then 40 mph no matter how much throttle I give,

Motor runs fine transmission shits fine has full rpm range all gears but at 40 it will not run any faster no matter how much throttle you give
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Rough idle and stop when I first start the engine in the morning

I have 2005' Legacy 2.0 4AT. Problem 1 As I mentioned in the subject. When I first start to the engine it's quickly working but somehow if I try to change gear to D it stops (sometimes it's not but ...
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Understanding ECU hex changes for language change

Is there a way to understand the ECU files hex changes applied by the software? I'm new to ECU files and struggling to understand possible areas of interest in the file. For example, when the language ...
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49 views

Daihatsu Materia 2005 model 1.5 engine smother while driving

we have a Daihatsu materia 2005 , we replaced the plugs,cam sensor , petrol pump, body sensor, air intake temp and catelis converter. The car drive fine when cold, but after a few kilometres it doesn’...
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Why Long Term Fuel Trims Remains in Negative?

Dear Experts here im attaching log of 1SZ-FE, 1.0L engine for your kind consideration, please advice why my LTFT remains in -ive though MAF, Intake Air Temp sensor, ECT sensor and O2 sensor is working ...
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152 views

Vehicle is stationary but live data from ECU says Vehicle Speed is 255 km/h, throwing codes P0717 & P0793 and no reversing

I'm repairing Toyota Harrier ACU# (Automatic transmission) with no reversing problem. When gear is shifted to R she throws codes P0717 (input speed sensor A no signal) and P0793 (Intermediate shaft ...
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329 views

Low LTFT, high STFT

Disclaimer: I am a novice, so I possibly have made many errors during the process. I have a Mercedes-Benz A Class w168 (2001). It has a problem that sometimes, when running low RPMs it shuts down (...
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178 views

Will disconnecting battery lead to remaps being reset?

Civic Coupe VTI 1999. If car has been remapped, will disconnecting battery for a long time cause any remaps to be reset?
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92 views

Will ECU with slightly different part number work for my 2001 Toyota Camry?

I would like to replace ECU of my 2001 Toyota Camry (1MZ engine) because it has very high fuel consumption. The part number of current ECU is 89661-33880. I couldn't find an ECU with the exact same ...
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423 views

Ford Figo not starting immobilizer

I have a ford figo 2012 petrol automatic that is not starting. When I turn the ignition to “ON”, all the lights on the dashboard come on and the immobilizer light blinks. The car used to start before. ...
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127 views

E34 BMW V8: unusual CAMshaft sensor signal voltage from ECU

My BMW is an E34 with an M60 engine (OBDI) and one morning started idling and running poorly enough to not be drivable. Unplugging the camshaft sensor with the engine running made no change to the way ...
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Volkswagen GTI OBDII Readiness

I have a 2015 Volkswagen GTI SE (2.0T) which is (a little over) due for an emissions test. A few weeks ago I had some rear-end bumper damage repaired, and while in the shop they cleared the trouble ...
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1k views

Shall I disconnect an EFB start/stop car battery before charging it?

I have a 64Ah EFB car battery in a 2018 Volkswagen car with start/stop technology. I have an Optimate 5 charger which supports EFB and AGM start/stop batteries:https://optimate1.com/om5ss/ I would ...
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New ECM, car will not crank, VIN is programmed correctly

I have a 2013 2.5L Chevy Malibu LS, which had a bad ECM (Water got in and destroyed part of the board causing random sensor errors and randomly killing the car when driving, randomly deciding not to ...
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Random Battery Voltage Drops

I have a 2008 Pegout 207 that does not start anymore, since the car has parked for a while, I assumed it was the battery (the battery icon was flashing). Even with a new battery the car does not start,...
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2k views

OBD2 Scanner can not detect ECU 2002 Mitsubishi Lancer

I bought a OBD2 Bluetooth scanner online. However, when I connect it to the OBD2 port in the car, the app while connecting to the OBD2 scanner gives an error message that it cannot connect to the cars ...
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62 views

2003 GSXR 600 ECU Toast?

So I've been back and forth with why my bike keeps fouling a plug in cylinder 4. Intermittent firing and real poor performance. Motor would shut down while in 4th gear. Sketchy clutch at start, super ...
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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 ...
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871 views

Delphi MT05 ECU mph to kph

Is there an ignition key sequence for changing MPH to KPH reading for a Delphi MT05 ECU? The bike is a Brixton BX125, had to perform a hard reset of the ECU to clear out a fault code and that switched ...
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870 views

Can I find out the unique code of my original car ECU?

I recently got my ECU changed although it was not causing any symptoms. I was still able to use my car with my original ECU. After getting my ECU changed, my original ECU does not seem to work anymore....
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How are new cars (with HO2Ss) affected by cold starts?

New cars have H2OSs to warm the O2Ss. Is this, and any other new tech in new cars, enough to remove all the negative effects of a cold start? How does a cold engine behave differently now (2019) ...
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103 views

Siemens sim2k-34vr ecu parametrs and service ids

I need to read parametres like RPM of the engine from siemens sim2k-34vr ECU from obd2 port through K-line protocol,I tried standard service id 0x01 to read current data but ECU said 0x01 service id ...
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Is it possible to reset the mileage of relatively new vehicles and is there a way to identify whether milate has been reset?

In my country, people believe that some vehicle sellers reset the mileage of vehicles to a lower number when selling the vehicles. I want to know whether it is actually possible to do this in modern ...
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2004 Vitz door/trunk control(ler?) problem

I have a 2004 Vitz which uses a key with built in 1 button remote. This remote is supposed to unlock the doors and allow the boot switch to operate. (Car is started with a regular key) The doors work ...
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279 views

Secondhand ECU recoding

I have a Passat 1.6 blue motion 2014 and the car has suddenly becomes immobile when trying to start and responds with many warning lights,on occasions it does start and run but not for long.I have ...
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48 views

Removal and replacement of OEM ECU

I own an Aurora, which of late has had some strange electrical issues, like trunk flying open when I lock the doors using driver side button, antitheft onstar not recognizing my key when in ignition, ...
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ECU tune file formats

I'm new to the ECU (or chip) tune concept, and I try to understand what is going on there. I understand the concept and the goal, but I'm having difficulties to understand what is actually going on ...
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ECU Problems Corsa comfort 1.4 2001 auto

I have a Corsa 1.4 that starts and stops and starts after a break. Sometimes not at all. Cranks. After replacing crankshaft sensor, relays on the advice of the RAC who brought me home twice and ...
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238 views

How do paired injectors work?

I'm currently in the process of searching for a cheap standalone ecu, but the main limitation of them is the fact that they have only 4 injector outputs. I have heard and read in the ecus ...
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Is it possible for an oxygen sensor spacer to cause a car to stall?

VW CC 2010 2.0L CBFA I installed an O2 sensor spacer on my downstream O2 sensor and it seemed to be working for a day. One day later, after the car had cooled down it would rough idle and stall when i ...
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2k views

Can the original ECU be replaced with other ECU codes on the same vehicle?

Here is the original ECU of the car, but I have a question whether it can be replaced by another ECU with the same MEG code 17.9.12.1 but different from the 39110-04006 line (by uploading the original ...
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Pull start fuel injected motorcycle/car injured or not?

A lot of time I heard from some people that pull start fuel injected motorcycle or car injured engine by shifting the time of engine or confuse EMS(Engine Management System computer) because tires ...
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187 views

How does a typical OBD communication start?

I'm trying to understand how, at the level of SID (Service Identifier) ​​and PID (Parameter Identifier), a communication must start between an external scan tool and any vehicle ECU (Electronic ...