Starter Signal Circuit

CIRCUIT DESCRIPTION

When the engine is cranked, the intake airflow is slow, so the fuel vaporization is poor. A rich mixture is therefore necessary in order to achieve good startability. While the engine is being cranked, the battery 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.

Wiring Diagram:

INSPECTION PROCEDURE

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

Step 1 - 2:

TOYOTA hand-held tester

Step 1 - 2:

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