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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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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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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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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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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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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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1answer
22 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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45 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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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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35 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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37 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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235 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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64 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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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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320 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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298 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
1k 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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708 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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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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1answer
118 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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107 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?
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83 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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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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492 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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782 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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302 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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296 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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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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289 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
11k 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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109 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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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
11k 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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490 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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354 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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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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104 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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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
679 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 ...
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2answers
773 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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2k 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
417 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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103 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
772 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. ...
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73 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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74 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
8k 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 ...
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2answers
1k 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
429 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 ...