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Electronic Spark Timing <--> [Electronic Spark Control Module] > < Reference Signal <--> [Cranking Signal]|Description and Operation|Page 2429

Firebird V8-305 5.0L VIN E TBI (1989)

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Wiring Diagram For Crank Signal

CIRCUIT DESCRIPTION:

Crank signal is a 12.0 volt signal to the ECM during cranking to allow enrichment and cancel diagnostics until engine is running.

TEST DESCRIPTION:  The numbers below refer to circled numbers on the diagnostic chart.

1.

Checks for normal (cranking) voltage to terminal "C9" of ECM. Test light should be "ON" during cranking and then go "OFF" when the engine is
running.

2.

Checks to determine if the source of the blown fuse or fuse link was a faulty ECM.

Electronic Spark Timing <--> [Electronic Spark Control Module] > < Reference Signal <--> [Cranking Signal]|Description and Operation|Page 2429