Starter Signal Circuit: Notes

NOTE: Starter signal circuit is mainly used to increase fuel injection volume during engine starting. Starter signal circuit test is based on the premise that engine cranks normally. If engine will not crank, diagnose by symptom. See TROUBLE SHOOTING - NO CODES article.

CAUTION: If Engine Control Module (ECM) replacement is instructed in the following testing, always ensure ECM wiring harness electrical connector and ground circuit are okay. If either are defective, repair and repeat testing to confirm ECM malfunction.

NOTE: When performing starter signal circuit test, it may be necessary to consult the starter wiring diagram for the entire wiring circuit. For starter wiring diagram, see WIRING DIAGRAMS in appropriate STARTERS article in STARTING & CHARGING SYSTEMS.