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.