Cranking Signal: Testing and Inspection
Fig. 010 Chart C-1B Crank Signal:
Fig. 011 - Wiring Diagram for Chart C-1B Crank Signal. VIN 0, VIN 2, VIN R:
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.
1. Checks for normal (cranking) voltage to terminal "1" of ECM. Test light should be "ON" during cranking.
2. Checks to determine if source of blown fuse was a faulty ECM.