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561 ECU Repair - DIY? 200 1988

uid 27's pic
posted by  Art Benstein on  Fri Nov 26 07:00 CST 2004
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last visit: Fri Oct 17 20:10 CST 2014
[RELATED]

Retirement project? Take a look at your old one, presuming you've found a replacement ECU to get your car back on the road. Unless you could deal in thousands quantities, the work to duplicate that circuit, of which the fuel pump part is a miniscule portion, has no reward I can imagine. Not when there are megasquirts to play with, for example.

If junkyard replacements really get scarce, substituting a K-jet relay to preserve the safety, if not plug and play, is a viable alternative. ColinUK and Lucid have provided step-by-steps; Chrissij pointed out valid caveats in the way of consequences to subsequent owners, if any of us actually consider selling our bricks once so modified.

TIP transistors? For injector drive, idle motor and on-board +5 regulator, but none of the relay drivers... they're mostly 150mA TO-92 on the earlier ECUs, and, except for the hybrid surprise on that fuel pump relay, in an 18-pin dip array on the LH2.4.



Area of hybrid from where fuel pump relay is driven (pin 3) on the failure-prone hybrids.



Same area on the improved hybrids.

--
Art Benstein near Baltimore Crrrrazy Ray's!






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