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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64 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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159 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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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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2005 Jeep Cherokee key transponder issue linking to fuel

I currently have a 2005 Jeep Cherokee 2.8D in the workshop. It seems as though there is a communication error between the key and its transponder. The ignition turns on and the engine turns over, ...
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56 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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70 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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33 views

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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235 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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311 views

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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23 views

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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798 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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30 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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37 views

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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500 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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437 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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83 views

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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74 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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163 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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41 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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890 views

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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53 views

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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130 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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1k views

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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581 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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27 views

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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1answer
136 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 ...
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100 views

How to get started tuning ecus?

Now I plan on building my own vehicle soon , and I wanted to know where can I begin learning how to tune a vehicle’s ecu and the necessary programs required to tune ecus on top of the understanding ...
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12k views

When doing an engine swap , do you have to have a matching ecu

Now I’m familiar with engine swaps and where they can be useful, but the idea behind the engine management system throws me off.If for example , I have a stock engine in my 2008 Chevy impala , then I ...
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29 views

Engine not rev over 3500 after new ECU installed same number

I have Honda civic vtec 1999 with D15 engine installed. ECU/PCM reporting error and mechanic told me this computing having issue in IC I bought new ECU same number but after connecting, car engine ...
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3k views

VW Golf MK4 1.6 to 2.0 engine swap: which ECU to use?

i successfully changed my engine from 1.6 to 2.0 in a MK4 Golf 2001 the engine 2.0 start fine and run soft, but i am using the engine ecu from the 1.6. my question is if i can change the ecu from 1.6 ...
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68 views

110cc scooter sputters under acceleration. Resetting ECU a temporary fix

This is driving my crazy. The dealership is just throwing parts at it. First time, they hooked it up to a little cylinder which has a guage and is connected to pressurized air and connects to the fuel ...
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34 views

Is it possible to reset a modified Airbag Control Unit to factory default?

I discovered my BMW E46 320d has been in a small crash and the airbag was deployed. The previous owner didn't fix it correctly and reused the airbag and modified the Airbag Control Unit (probably just ...
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1answer
812 views

VW 2015 TDI (EA288) Oil Sensor(s)

I recently acquired a 2015 VW Jetta TDI, and while someone was taking a long trip, in cold weather, the oil light came on. A yellow light, which does not match any indicators in the owner's manual. ...
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100 views

How does ecu know the hand brake is on?

I was reviewing the data around the DTC event, and it said the hand brake was on. I assumed it was a software bug, because I was sure the hand brake was off, but today after jacking up the rear I ...
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89 views

Car Jump Started in wrong way

We switched the jumper cables when trying to jump start my Altezza 4 cylinder. Main fuse and other fuses were blown. I replaced all the damaged fuses and battery. When we eventually got the car to ...
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1answer
114 views

Can my ECU tell me if my air filter should be changed?

While replacing my air filter I was looking at the old one and wondering, "I can see this has debris on it, but how much was that affecting airflow to the engine?" Obviously the more restrictive the ...
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340 views

Fault code retention on scania

I had an incident in a Scania which was showing an "ABS Malfunction" warning on the dash at the time. My inquiry is if it is possible to "historically" look into the system and see the fault and any ...
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46 views

No resistance measured between two electrical parts, ECU fault?

I'm troubleshooting a car with a faulty Camshaft Sensor error. I used the factory test plan to test the wiring between the sensor & ECU. Here is the wiring: ECU Pin87 -> Wireloom Pin 87 -> ...
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76 views

Why is this RPM graph squarewave?

'07 Subaru Outback 3.0R 5 speed auto. I am logging using the excellent RomRaider and was kind of surprised that when graphed RPM looks like a square wave in most situations, don't know if it was ...
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67 views

Why would this happen:

If anybody could help me understand this behavior, I'd be grateful: 2003 R1 5PW, Fuel-injected, has an alarm/immobilizer fitted, doesn't report any fault codes: Motorcycle would occasionally (three ...
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56 views

Installing electronics next to SRS Airbag controller in car

I have bought an add-on for my car stereo (GROM USB3) which adds USB and Bluetooth capability for playing music and answering calls. This module is contained in a little box with 4 ports, and connects ...
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363 views

1996 Volvo 960 won't spark or inject

After a customer had destroyed his engine(wrong fuel), the engine was replaced by my colleague with a 2nd hand one from a running car. However, it won't inject or spark when starting. It concerns a ...
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3k views

U0100 Toyota Aygo CAN Stop Communication or DTC Diagnostics, which is right?

I spent a lot of time trying to resolve some problems with a 2006 Toyota Aygo. The most important or significant code it has is U0100: No communication with ECM/PCM A. Information for 1KR-FE engine, ...
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103 views

Car keeps breaking fuel injectors?

Ok so i'm having quiet a strange issues with one of my cars (08 X5 E70 4.8L V8) that may be worth discussing. It seems to keep "blowing" through injectors on only one bank. Suddenly i noticed CEL and ...
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91 views

Fuel Map and fooling the speed sensor

Sorry, I didn't know what kind of title I could put for this. I have a '97 Subaru Impreza WRX STi and, as a technical project, I would like to remove the potential (haven't checked yet) 180km/h ...
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1answer
772 views

Considerations for a successful VW 2004 Jetta 2.0L engine swap in place of a 1.6L engine

Vehicle make: Volkswagen Model: Bora Year: 2004 Issue: Swapped the 1.6L for a 2.0L. No programming of the ECU was necessary neither was a change of ECU necessary until vehicle started misbehaving - ...
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522 views

testing for voltage

I am sitting with a problem that is slowly draining my wallet. I drive a opel corsa utility 14i, and after having to replace a blown head gasket, all sorts of gremlins started popping up. First no ...
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127 views

Why modern car networks are known as “unsafe”?

Engineers and tech people like Craig Smith (who made a great book about hacking cars) never stop warning about car security. Saying that modern cars ain't secure and can be hacked from the outside (...