Starter Signal Circuit

Starter Signal Circuit

CIRCUIT DESCRIPTION
When the engine is cranked, the intake airflow is slow, so fuel vaporization is poor. A rich mixture is therefore necessary in order to active good startability. While the engine is being cranked, the battery positive voltage is applied to terminal STA of the ECM. The starter signal is mainly used to increase the fuel injection volume for the starting injection control and after-start injection control.

HINT: This diagnostic chart is based on the premise that the engine is cranked normally. If the engine is not cranked, proceed to the matrix chart of problem symptoms.





WIRING DIAGRAM

INSPECTION PROCEDURE

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Step 2:

LEXUS hand-held tester

Step 1:

Step 2:

OBD II scan tool (excluding LEXUS hand-held tester)