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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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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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23 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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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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642 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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Mazda DP alternator problem Replaced regulator now car swings but doesnt start Seems like no spark

ECU controlled alternator Could it damage ECU if the pin was left in the brushes after assembly? After new DP regulator was fitted car has no spark.
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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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345 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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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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23 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
210 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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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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40 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
54 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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239 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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32 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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561 views

Nissan Rogue 2010 no reverse after replacing valve body

Vehicle moves forward Vehicle does not go backwards. Vehicle throws codes related to accelerator pedal position sensor. I didn't work on that so I am stupified. I have checked the service manual ...
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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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2answers
44 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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2answers
227 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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812 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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54 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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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
518 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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249 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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113 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 (...
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1k views

Coding a second hand ECU

I am looking to purchase a second hand ECU for my 1997 Toyota Starlet. The advert for the ECu states that it will need coding and I am unsure if this is something I can do or if I need an auto ...
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716 views

Can't detect Proton GEN2 ECU

I bought an old 2004 Proton Gen2 car, and its Engine light is on, so I bought an OBD2 device to check the engine errors, but I can't manage to access to ECU. Photo of engine light on: photo of OBD ...
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1answer
2k views

Is an AC compressor's clutch supposed to cycle off when the RPMs become low enough?

The car is a Vauxhall Agila A and the compressor is a Delphi CVC internally controlled compressor, so it's basically supposed to never cycle while the AC is on. The transmission is obviously manual (...
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1answer
3k views

No voltage on injector lines following engine rebuild

I have a 2012 Ford Fiesta 1.4 L TDCi. It was starting normally but the engine had major mechanical problems so I have rebuilt it and put it back in without touching any electrical part. Now I'm ...
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86 views

5 speed to 6 speed transmission swap reprogramming?

I have a 2003 Pontiac Vibe (which is the same as Toyota Matrix) that the transmission locked up. For what I researched it is a very common problem with the Vibe. Solution suggested was to swap it for ...
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240 views

ECU repair Opel Corsa Diesel

The ECU in my son's Opel Corsa got wet. A common issue with those model's. An auto electrician repaired it by changing a few damaged components. The mechanic installed it but could not start the car. ...
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Where can i find official scientific documents with table of PIDs for ECU

I need an official document for reading information from PIDs that manage comunication with ECU of car. I'm searching to sae.org and iso.org but i don't find nothing. Can someone guide me?
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140 views

Won't pass emissions, Bad ECU?

So, Last year my 94 Acura Integra AT passed emissions by the skin of its teeth, this year it won't pass, I have noticed in past year and half that dropped from around 30mpg to about 15mpg. Some times ...
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89 views

non v-tec swap to a v-tec

ive got a 98 civic dx engine is a D16y7 non v-tec I have swapped engines to a v-tec D16Z6. im having problems with the ecu it does not work on a v-tec motor. it does start the car but no v-tec ive ...
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845 views

OBD request trouble code mode 3 and mode 7

I'm trying to get my own app on phone to read Trouble code in car... I see that i have 3 mode to do this... first is to use the mode 01 with command 01 (but this command is generic) or the mode 03 and ...
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2k views

How to remove pin from Subaru ECU plug

I need to add a cable into an existing plug for a 2007 Subaru Legacy (BP) vehicle. For practice I picked up an identical plug from the wreckers. Figured I could use the pin and cable from the test ...
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4answers
1k views

Gonna remove my Cat…issues with the ECU 😳?

The Cat. Converter on my 2005 Ford Territory SUV (245 cubic inch Twin Cam 6 Cyl)Australian Model is stuffed and I'm removing it (they cost the National Debt 💸)....I know I can be arrested / fined a ...
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398 views

Mahindra Scorpio ECU problem

I am facing problem while displaying metrics on my Android phone, i have this Bluetooth Module and using torque (Lite) app from Play Store. Device is connecting to the phone quickly, but it's taking ...
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4answers
6k views

Does a replacement ECU need programming to the car?

I've got a 2004 Toyota Avensis with the 1.8 petrol engine that needed an ECU replacement or repair. I received £700 invoice for the used ECU which I doubt it, the guy was saying something about ...
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218 views

my subaru's getting no injection signal from ecu

I have a problem starting my Subaru engine ej25. I had my sub wire (hot) hit the body of my car and I think I have spiked my ecu (Motec-m400) and nows its doing all sorts of stuff with my coil packs. ...
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494 views

Ecu problem on my 1997 toyota corolla

I have now traced the wire that renders my fuel pump powerless. The wire runs from the ECU to the fuel pump relay. It must carry a - charge in order to work the pump. But unfortunately, it is not ...
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20k views

Can a car operate without a catalytic converter?

So I was reading this Quora question which answers in the affirmative, but here's my misgiving: I was under the impression that the oxygen sensor which the ECU uses to adjust the fuel-to-air ratio, is ...
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1answer
203 views

Uploading a tuning file to my car

I would like to remap my car myself. I will be buying a tuned map from mychiptuningfiles.com for my Ford Focus 1.6 TDCI so I only need to download my stock map and upload the tuned stock map. What ...
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2answers
14k views

What does it take to program a used ECU?

I own a Mazda MPV 2000 with a faulty ECU. The vehicle has an immobilizer. It will not start with the former ECU. It floods the engine with fuel. After extensive diagnostics on the vehicle and the ...
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6answers
21k views

Can retail OBDII scanners “kill” my car's ECU?

I have a run of the mill OBDII scanner from Amazon. I connect it to my phone's (Android) app, Torque PRO, via Bluetooth. I have been using it for 22-months. No problems whatsoever. My car never ...
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859 views

Does the computer in modern cars record the maximum RPM attained by the engine?

I have a 2013 Maxima and I'm wondering whether its computer would have recorded the highest RPM it has attained in the past. Is this something all modern cars are able to do? The dealer closest to me ...
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517 views

Honda cbr250r ECU question

Can a used ECU from a Honda CBR250R be reprogrammed with different parameters to increase performance?
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21 views

No injectior signals and error codes

On a Hyundai Accent CRDI 3 cylinders, there is no signal on the injectors wires during cranking but if the car is forced to start with other methods the injectors will start getting the signal and ...
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130 views

ECM voltage, spark spike

When the car was idling in the garage this morning (hooked up to HP Tuners), I saw a spike on the "Spark" graph at the same time as the car stumbled. "Control Module Voltage" also went from > 14 down ...