Re: LT31 1983 - issue with electronics
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Geschrieben von Tiemo am 28. Oktober 2014 22:45:42:
Als Antwort auf: LT31 1983 - issue with electronics geschrieben von Marko Ilmari am 28. Oktober 2014 19:18:12:
Hello Marko!
Sounds like several problems, maybe they are independant from each other. Maybe there is water in the footwell, which also moistens the fuse box. Just look under the carpet, it should be dry under it.
>Whenever I click the blinker to the left, it won't blink (only alarm sound will start to yell), but if I turn on the emergency blinkers, both left and right blink just fine. Fuses are brand new. Should I possibly locate some kind of controlling circuit of the electronics? Could anyone please give me a hint where should I look for a such? Or do people have any other ideas? (I guess I'll start with giving the wires some CRC electronic cleaner when I get to the store.) The alarm that you can hear may be the flasher relay, which has a contact issue, high impedance due to corrosion/moisture/dirt: When it closes the circuit, voltage braeks down. So it instantly breaks the circuit again. Voltage comes back and the process iterates. This happens some ten times a second, so the flasher relay makes a humming sound instead of ticking and the flasher won´t light up (but the green indicator will).
If the problem occurs only during blinking left, but does not occur blinking right, the direction-control might be buggy. If it occurs during blinking in either direction, but does not occur using the emergency blinkers, the fault is in the emergency blinker control, which switches supply between two circuits. Maybe the control comes back to function by switching it repeatedly. If not, pull out the control switch and unplug it. Clean the plugs, push in / pull out several times to remove corrosion products (Be careful, there is a multipole-plug an a single one!). If it still doesn´t work, try a new switch.
>There's also another similar issue in the same car: left front head light (driving light) turns on only if the full (night) headlights are on. Otherwise the left headlight won't go on. Little parking lights go on normally. This is very often a problem with the multipole-plugs behind the fuse box. The white one in position "A", pin "A18" corresponds to the left headlight. Sometimes the problem can be solved by cleaning and plugging/unplugging like described above. Sometimes the plug looks like the one in our "WIKI", see http://www.lt-forum.de/dokuwiki/doku.php?id=start:wichtige_daten:relais_zentralelektrik:steckerbelegung .Then you probably need a new plug or cable loom or at least repair of the plug.
>I thought that would be enough of troubles, but no, there's more: The starting of the car has weakened noticeably, the starting motor is trying to do its best, but starting takes much of time and effort. Possibly because of the same electronic issue also the pre-heater of the diesel motor has been disconnected? The indicator lamp of the pre-heater still works. This may be caused by the outage of two fuses in the motor-compartement, which protect the preheater circuitry. For location and pictures again see our WIKI, http://www.lt-forum.de/dokuwiki/doku.php?id=start:reparaturtips:vorgluehanlage#sicherungskasten_streifensicherungen and http://www.lt-forum.de/dokuwiki/lib/exe/detail.php?id=start:reparaturtips:vorgluehanlage&media=reparaturtips:vorgluehanlage:lt-gluehanlage_wo_ist_was.png, "Streifensicherungen".
Built in, the fuses very often look ok, but if you start loosening the screws, they simply disintegrate...Annother common problem are air bubbles in the injection-pump, often caused by leaking hoses on the injectors. Air gets into the system and lets the fuel sink back into the tank. If you crank the engine, the injection pump has to exhaust the system and fill it with fuel before the engine can start. This can take more than a minute and worst case the motor can´t be started.
This is a common problem and so we have a page for it in our WIKI, see http://www.lt-forum.de/dokuwiki/doku.php?id=start:reparaturtips:leckoelleitungSo good luck debugging your LT!
Tiemo
- Re: LT31 1983 - issue with electronics Marko Ilmari 24.11.2014 20:19 (7)
- Re: LT31 1983 - issue with electronics Tiemo 26.11.2014 11:06 (6)
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