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561 ECU Repair - DIY? 200 1988

posted by  someone claiming to be art on  Thu Nov 25 15:01 CST 2004 [RELATED]

When I first heard of the common failure of fuel pump ground output on these computers I figured it ought to be a simple problem solved by replacing the relay driver transistor, like it would be if this problem happened to the older LH2.0 and LH2.2 fuel computers.

But as others too have learned, the transistor that drives the fuel pump relay is part of a 40-pin ceramic custom hybrid circuit which makes up most of the LH2.4's interface functions. It was improved in later production -561 ECUs and used in the -951 version which dropped support for the cold start injector.






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