Cranking Holding Function Circuit: Description
The cranking holding control system continues energizing the ST relay after the ECM detects the starter signal (STSW signal) from the main body ECU until the ECM performs a judgment of "engine started". Furthermore, the ECM outputs an accessory cut signal (ACCR signal) to the ACC relay during cranking to prevent flickering of the combination meter, clock, audio system, and other components.
When the ECM detects the STSW signal, the ECM outputs the starter relay drive signal (STAR signal) to the starter relay through the clutch start switch or park/neutral position switch, and then the engine is cranked. The ECM stops outputting the STAR signal when a variety of conditions are met, such as when the NE signal reaches a predetermined value and when the engine speed is stable. Also, the ECM monitors the ST relay operating conditions based on the STA terminal voltage status.