My engine worked great until the batery was disconnected it seems that the ecm lost all memory and doesnt work
door open signal with blinking lights while driving drained the battery so i wanted to change it but caused the memory loss
what do i need to do
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Re: audi 1999 a4 1.8 turbo
First thing is to disconnect the battery again, wait a minute or two, then hook it back up. Put the key in the ignition, turn it to full electrical power, but don't start it. If you have the hood open, you may hear a humming from the engine - this is the throttle body being aligned by the computer. This will help with driveability. You may need up to a week for the car to fully sort itself out though - it seems to vary widely from car to car.
Don't forget to reprogram your one-touch windows too. For each one that has one-touch down, hold the button down until the window goes fully down, then release the button and quickly press and release it again. Then hold the button until it goes all the way up, release, press up and release again. This reprograms the one-touch up feature.
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There are several possible faults:
1. Pressure sensor is faulty (it might come up on diagnostics as if it was working fine, but it shows the wrong manifold pressure).
2. Either one of the boost pipes/hoses or the intercooler have a hole somewhere.
3. Turbo's actuator is stuck.
4. Vacuum hose is damaged which goes in to the turbo actuator.
5. Control valve for the turbo actuator is not working properly.
Your A3 should sound a warning beep if you leave your lights on. For this to happen the light switch would be in the side, or dipped position, the key out of the ignition and the drivers door open. If it does not sound the car may not be getting either the door or key signal. To check the key out signal, key the ignition to the on position, turn on the radio (probably only work if a standard radio is still fitted) then key off and remove key, if the radio goes off, its a good sign thats ok. For the door signal make sure opening the drivers door brings on the interior light on, this shows it recognises when its open. Let me know if anymore advise is needed.
As for the mic wiring, as far as I'm aware there were no standard/optional phone kits for this age A3.
The guage and fan speeds work on independant sensors. If you can remove the plastic engine cover and locate the "sending unit" for the gauge disconnect it and restart the engine. The gauge should remain cold and not move. If this is the case replace the sending unit. This should be a single wire sender located in the waterjacket of the intake manifold look in the area where the upper rad hose enters the intake.
Hi A J Mae,
Do you mean the traffic indicators,( turn signals) or do you mean the dash board indicator lamps? If it's the dash warning lamp indicators, they work on a fail safe system, when you turn the ignition on before the start position, all the lights will come on untill start up and ten they will go off automatically within a second or two....if they stay on with the engine runnig you have a problem we have not covered here.
That will be your hazard warning switch, the one that will be flashing on the dash with a triangle showing on it....If that doesn't do it it'll be something to do with the anti theft device...get out of the car lock all the doors and then press the button on the key fob