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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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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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0answers
42 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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0answers
33 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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0answers
26 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
166 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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1answer
45 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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1answer
91 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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1answer
113 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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1answer
168 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 ...
2
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1answer
991 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 (...
3
votes
1answer
285 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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0answers
39 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 ...
2
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1answer
97 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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1answer
87 views

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?
4
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1answer
71 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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0answers
35 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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0answers
363 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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2answers
537 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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3answers
163 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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0answers
276 views

Mahindra Scorpio OBD codes means

I have Mahindra Scorpio crde 2007 model, I have a problem with it, while I was driving yesterday to my home ECU light glows in my cars instrumentation cluster and after 10-15 seconds the car ...
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1answer
231 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
2k 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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0answers
92 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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2answers
224 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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2answers
8k 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
81 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
6k 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
8k 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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2answers
383 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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2answers
292 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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0answers
16 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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3answers
94 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 ...
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1answer
87 views

Why buy an ECU with the highest version alphabet?

There is very little information online about the advantages of purchasing an ECU with the highest version alphabet - which means the most upgraded version. My question is - what kind of benefits ...
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1answer
484 views

Help tracking down a battery drain issue on a 2007 Vauxhall Corsa

I'm really hoping someone can help track down a battery drain issue with a 2007 Vauxhall Corsa. We've been back and forth to a Vauxhall garage with this car since we bought it and have had a hell of ...
4
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2answers
655 views

ECU/PCM plug pinouts

I'm trying to find out which pins on a Bosch WE0718881B ECU (For a 2007 Mazda BT-50/Ford Ranger) go to the ECT sensor. I'm been looking for pinouts of the two plugs on the ECU but getting nowhere. ...
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2answers
1k views

Can a check engine light reset itself when a scan tool is connected?

I have a Toyota RAV4 2002 4WD. I was driving to the car wash when suddenly the check engine light come on when I accelerated hard. After the wash, it still was on. I drove home, shut it off, turn it ...
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1answer
327 views

Changing or disabling vtec switchover RPM in 7th generation Honda Accord

I am considering increasing the VTEC switch-over point in my 2007 Honda Accord. The reason I want to do this is to improve the MPG of the car. In this question I am ignoring the open loop versus ...
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0answers
96 views

Emissions per mile of high MPG lean-burn gas-powered cars versus standard gas-powered cars

I am wondering if there have been studies or calculations of the NOx emissions per mile of high MPG lean-burn gas-powered cars versus standard gas-powered cars. Honda made some great lean-burn cars ...
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2answers
659 views

Replace or Repair Mazda MPV 2000 faulty ECU?

I asked a question about troubleshooting ECU related short circuits. No more short circuits in the wiring harness, the only short left appears to be inside the ECU. This leaves me with a faulty ECU. ...
3
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0answers
57 views

Cadillac CTS “Traction Control Off” displayed after driving 15 mins

After driving 15 mins the "Traction Control Off" light is displayed on dashboard and radio displays "Service Brake Assist". All go away after engine is turned off for about 20 mins. It recently got ...
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1answer
62 views

Which codes does the front oxygen sensor throw?

I have these three O2 related sensor error codes. Are they all codes for the front 02 sensor (the one in-front of the catalytic converter) ? P1133 - HO2S Insufficient Switching Bank 1 Sensor 1 P0133 -...
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1answer
6k views

Does disconnecting the battery reset on-board memory?

Will disconnecting my car battery reset the on-board memory or do I have to manually erase it to remove error codes? I ask because I have a faulty electrical system that throws gas leak errors and I ...
3
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2answers
982 views

DLC Pinout for SVX ECU

Below is the pinout for a 92 Subaru SVX Engine Control Unit (ECU). Since the wiring harness is no longer collocated with original car, I have no idea as to what the pinout for the Data Link ...
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1answer
378 views

Ford DuraTorq TDCi EGR system (Euro4) operation, blanking

Specifically the 2008-on (Euro-4 emissions compliant) 2.2 diesel as fitted to Jaguar X-Type (and Mondeo, Transit, etc.) but I suspect the entire DuraTorq family are the same: I've seen EGR blanking ...
3
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1answer
78 views

Replacing an ECU

i changed the ECU on a Toyota Avensis 2009, it turns on and everything is fine, but the instrument cluster isn't working at all... It was working perfectly before i replace the ecu? Any clue why ...
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3answers
277 views

Can I replace my ignition coil with a ECU?

Can I take the ignition coil out of my 1965 dodge challenger and replace it with a ECU? If I can, how will I go about doing it? Can it be a simple replacements?
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0answers
217 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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1answer
1k views

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 ...
5
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1answer
94 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? ...
5
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2answers
633 views

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 ...