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In answer to Franks question, a shorted power transister could take out the driver in the ECU as they are not thermally protected.


Conner -

Are you saying that the transistor would damage the ECU? - or that a shorted transistor would set a code for a bad ECU that would/could be corrected by replacing the transistor?

Frank

If the power transistor shorted, it could take out the transistor(driver) in the ECU. the early drivers were not protected. The later systems will shut down a driver and set a code before it is damaged under normal conditions. This does not occur in extreme conditions such as reversing battery cables and such.
Conner

Over the hill but still climbing.
88 Montero 2.6L auto, manual hubs, cooling fan conversion gps,recurved distributor,LSD Diff.