Help, Need new LH computer for 87 S-4
02-20-2005, 10:43 AM
#46
Rennlist Member
Hi MAtt,
No chance :-)
Even the hybrid in the Saab unit is different to the Porsche LH one. Although they look "similar".
I once received a unit for repair where someone had stuck a Volvo hybrid in their Porsche LH ECU. Luckily it didn't cause any damage...
No chance :-)
Even the hybrid in the Saab unit is different to the Porsche LH one. Although they look "similar".
I once received a unit for repair where someone had stuck a Volvo hybrid in their Porsche LH ECU. Luckily it didn't cause any damage...
02-20-2005, 11:47 AM
#47
928 Collector
Rennlist Member
Rennlist Member
Originally Posted by John Speake
Which chip, Heinrich ? Once the dreaded hybrid is repalced, they are usually very reliable.
I have sourced some to the other chips, some of which were specials, only made for Bosch.
I have sourced some to the other chips, some of which were specials, only made for Bosch.
Heinrich
02-21-2005, 05:30 AM
#50
Rennlist Member
""John My LH is in good shape, with only a bad 30016.""
Sorry, that's a Bosch custom special that I haven't managed to source that yet. Maybe Rich can help ?
Regards
Sorry, that's a Bosch custom special that I haven't managed to source that yet. Maybe Rich can help ?
Regards
02-21-2005, 02:52 PM
#54
Rennlist Member
At present yes - but they very rarely fail. The only other one I heard of was someone who was working inside the unit, and accidentally blew it up. I have never seen one fail during normal usage.
If I saw many of them, I would investigate an alternative circuit to replace this chip, just the same as was done for the hybrid circuit.
If I saw many of them, I would investigate an alternative circuit to replace this chip, just the same as was done for the hybrid circuit.
02-21-2005, 10:03 PM
#55
"John My LH is in good shape, with only a bad 30016."
This chip is a custom bipolar which basically never fails. To determine that
it's failed, you've checked all its I/Os against a known working chip in a fully
functional LH unit, right? If not, you're "throwing darts".
The other possibility is that you have access to the Bosch final
semiconductor production test plan for that chip and have set up
a test jig for the I.C.
The I.C. is basically a divide by 2 (programmable divide by 2, 3, & 4
via jumpers) counter & waveform shaper. The key outputs are
pins 12 & 15.
This chip is a custom bipolar which basically never fails. To determine that
it's failed, you've checked all its I/Os against a known working chip in a fully
functional LH unit, right? If not, you're "throwing darts".
The other possibility is that you have access to the Bosch final
semiconductor production test plan for that chip and have set up
a test jig for the I.C.
The I.C. is basically a divide by 2 (programmable divide by 2, 3, & 4
via jumpers) counter & waveform shaper. The key outputs are
pins 12 & 15.
Last edited by Lorenfb; 02-21-2005 at 10:36 PM.
02-22-2005, 10:54 AM
#58
928 Collector
Rennlist Member
Rennlist Member
Originally Posted by John Speake
Ok, This is the one I mentioned in my previous post ! Certainly Chris has asked me about sourcing one of these chips before.
