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Home >> Toyota >> 2003 >> Matrix Base, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing - 4-Cylinder >> Computerized Engine Controls >> Starter Motor Signal Circuit >> Notes

Starter Motor 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 SYMPTOMS in 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.
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