Cranking Signal: Testing and Inspection

Fig. 018 - Wiring Diagram for Crank Signal Wiring. VIN 8:

CHART C-2B, CRANK SIGNAL

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

Fig. 017 Chart C-2B - Crank Signal Diagnosis:

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.