'89 100Q wiring diagram needed! (no spark)

[Pete Gotseff]

On 21 Aug 00, at 20:15, Michael Murphy wrote in response to Pete G.:

>  no spark from coil, found toasted wire in previously
> > repaired harness to coil.  Coil still gets 12v

> How did you check the no spark from coil condition?  Are there any
> stored codes?  When was the last time you did ignition wires, distr.
> cap and rotor?  Don't ignore the obvious ;) -- Mike Murphy

Tested the coil the old fashioned way - take coil wire (R is within 
specs) and place near good ground and crank engine.  Result : one 
weakly little spark then nothing.  Ground for power stage had 
melted at one point and must be re-repaired (PO used duct tape to 
fix).  I think the blowing fuse#12 is a red Herring in this case, since 
S12 is not ignition related. 

My current approach will be to repair the powerstage ground (why 
did it melt in the first place?), then check coil Ohms then check 
ign. ecu output.  What is the failure rate of the power stage?  
Anyone?

Purchased the AutoZone Alldata CD and think its worth it for the 
wiring diagrams and TSBs.  Of course the Bentley is on order.
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Peter Gotseff
pag at hydrosphere.com
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