Motor Vehicle Maintenance & Repair Stack Exchange
Motor Vehicle Maintenance & Repair Stack Exchange

Questions tagged [computer]

Catch all tag which can refer to the "brain" of the car which can control the engine and/or transmission of the vehicle. This would include such terms as PCM (powertrain control module), ECM (engine control module), PCU (powertrain control unit), ECU (engine control unit), and many, many others.

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Are there requirements for building a car-PC and it's software?

I am currently rebuilding a car as a hobby. As a part of it I am planning on building in a car PC with custom software for some multimedia usage, navigation and some diagnose usage. I know there are pre-built systems to buy and install in the car…
Requion
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How do I find the correct pins in a CAN-BUS connector?

This question might be too technical for this forum, but I'll give it a go. I have a 2012 BMW R1200R motorcycle with CAN-BUS. I'd like to make an Arduino interface to the connector on the bike, but I don't know the pin definitions... Do anyone know…
Eric Fossum
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'09 Chevy Malibu - No Crank, No Start - Heavy Troubleshooting Already Completed

Answer: Turns out the computer was shot, entirely non-functional. Swapped one out and the car started right up. For future readers: The computer is a likely cause if the vehicle has power, yet multiple unrelated parts that connect to the computer…
Dylan Cross
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OBD-II difference between signal ground and chassis ground

Am planning to install a carputer (Raspberry Pi) in a 2005 Ford Mondeo, replacing the car stereo. The Quadlock connector to the stereo apparently includes CAN bus, so I am thinking I will get a USB OBD-II adapter and just solder the relevant…
Tomas By
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ECM vs. PCM vs. ECU?

Engine Control Module Powertrain Control Module Engine Control Unit Reading about them online, they seem to be the same thing, computers. So what are the spcific difference between them? Is the other one any better?
Jomar Sevillejo
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Why would my odometer reset to the same mileage whenever I turn off the ignition?

I have a 2000 Nissan Altima and the odometer (not trip meter) reads 86186 miles when I first start the car. As it's driven, the odometer seems to work correctly, incrementing miles. But if I turn off the ignition the odometer resets to 86186 miles…
docscience
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Is there a way to use a PC as an ECU for testing CANBUS Sniffer devices?

Is there a way to connect CANBUS sniffer device to a PC (computer) with CAN-H and CAN-L pairs and test the sniffer device? I want to convert my PC to an ECU emulator, connect a CANBUS sniffer device's CAN-H and CAN-L cable pair directly to a PC's…
Sencer H.
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Do I have to change my speedometer setting if I get larger tires?

I bought a jeep with very small tires (not sure the exact size). I recently bought a new pair of tires that are probably 2 or 3 inches larger radius. Do I have to update my jeep so the speed is calibrated for the larger circumference of the…
Sponge Bob
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How to control a car (accelerating, braking, steering) programmatically?

I would like to make a prototype autonomous car out of an off–the–shelf car (Toyota Yaris to be exact, but the instructions should be universal). One of the first steps is to get access to the on-board computer in order to control the throttle,…
niutech
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Manual ECU with Automatic Car

Have 92 Accord with 1.8 VTEC. The Installed Engine is From 98 Accord. The transmission is the original which came with 92 accord. This transmission is operated by Kick Down cable and does not have any Main Shaft or Counter Shaft Sensors. During Swap…
Afnan Bashir
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Can the warning chime tone of a 2007 BMW 525i be changed, or shortened somehow?

Can the warning chime tone of a 2007 BMW 525i be changed, or shortened somehow? The chime of this car comes from the computer and is used for most warnings such as seatbelt, temperature, door-open, key-in-ignition, etc. The problem is that it is…
Rod Dewell
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ECM replacement - starter runs during reprogramming?

(mid-90's Buick) Someone I know had an ECM injector drive output go bad. He got a replacement ECM online, but had to take it to a shop (not a dealer) to get it 'initialized' (If that's the right word.) He says that, to do this, the tech had the…
George
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Since when is CAN bus mandatory for new vehicles?

The CAN bus Wikipedia page states that: CAN bus is one of five protocols used in the on-board diagnostics (OBD)-II vehicle diagnostics standard. The OBD-II standard has been mandatory for all cars and light trucks sold in the United States …
Kozuch
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Do I need computer reprogramming when transmission is replaced?

Honda Odyssey 2003: I'm replacing a transmission, and a local mechanic will help me to swap it in my garage. I've been told at a local shop, that in order to install remanufactured transmission properly, a computer reprogramming is necessary. Is…
galets
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2008 Saturn Aura: Programming the mileage on a used BCM

HELP! I replaced the BCM in my 2008 Saturn Aura with a Used BCM. I then took it to the dealership to have them program it. Now I notice that my odometer isn't working, so I looked at my invoice from the dealership and it reads the same odometer…
Melissa
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