Cranking Holding Function Circuit: Description
The cranking holding control system provides current to the starter when the ECM detects the engine switch's start signal (STSW). When the ECM performs a firing judgment, the system cuts current to the starter. When the ECM receives the STSW signal, the ACC (Accessory) relay is turned off to prevent flickering of the combination meter, clock and audio system. Also the STAR output signal travels through the ST CUT relay and the park/neutral position switch to the STARTER relay, causing the starter to activate.
When the engine is cranking, the starter operation signal is received by the STA terminal of the ECM.