Cranking Signal: Testing and Inspection

Fig. 013 - Wiring Diagram for Chart C-1B Crank Signal. VIN P:

CHART C-1B, CRANK SIGNAL

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.

Fig. 012 Chart C-1B Crank Signal:

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.