Circuit Description

When the engine is cranked, the intake air flow is slow, so 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.


DTC Detection Condition

Trouble Area


No starter signal to ECM

«Open or short in starter signal circuit

«Open or short in ignition switch or starter relay circuit

In this circuit, diagnosis can only be made in the check mode.

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