Cranking Signal: Testing and Inspection

Chart C-1B - Crank Signal:

Wiring Diagram For Chart C-1B - Crank Signal:

CHART C-1B - CRANK SIGNAL


Circuit Description:

Crank signal is a 12V signal to the ECM during cranking to allow enrichment and cancel diagnostics until engine is running, or 12V is no longer on circuit.



Test Description:

1. Checks for normal (cranking) voltage to terminal "C9" of ECM. Test light should be "ON" during cranking.



2. Checks to determine if source of blown fuse was a faulty ECM.