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Where do the wires go? I would expect they would go to the ECU. I don't have a wiring diagram in front of me. Can you disconnect the ECU plug and run the same checks? This might help isolate a bad wire of connector between the ISC and ECU. Just my $0.02.

Yep disconnect the ecu and run the same test from there. be sure the isc is connected.


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