Hi and thanks for using 2CarPros.com. It sound like a crank signal issue. This signal is used to inform the ECM that the engine is cranking. The ECM uses this information to tell when the engine is in the cranking mode. If there is a failure, you will not get spark.
Here are the directions for diagnosing the problem. I have attached pictures below the pertain to these directions.
CHART C-1B - CRANK SIGNAL DIAGNOSIS
CCircuit Description :
Crank signal is a 12 volts signal to the ECM during cranking to allow enrichment and cancel diagnostics until engine is running or 12 volts is no longer on circuit.
Test Description : Numbers below refer to circled numbers on the diagnostic chart.
Checks for normal (cranking) voltage to terminal "C9" of ECM. Test light should be "ON" during cranking and then go "OFF" when engine is running.
Checks to determine if source of or fuse link was a faulty ECM.
You will need to have a test light. Here is a general video on using one:
https://youtu.be/Hlna_kUt7As
I hope this helps. Let me know what you find.
Take care,
Joe
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Friday, May 18th, 2018 AT 10:02 PM