Re: GM TBI ECU #1228746 No Injector Pulse

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Posted to Technical Discussion Forum on 12/30/2018

[1990 Chevrolet Camaro Iroc-Z, ECM/Inputs/Outputs Waveform]

CH A dist pick up coil while cranking

CH B DREF cranking low voltage at 226mv up to 6.1v

CH C EST with 1v pulses

CH D Ref LO at 144mv cranking

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