Tundra 4WD V8-5.7L (3UR-FE) (2007)
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Starter Motor: Testing and Inspection
Cranking Hold Function Circuit
Cranking Holding Function Circuit
DESCRIPTION
The cranking holding control system provides current to the starter when the ECM detects the ignition switch's start signal (STSW). When the ECM
performs a firing judgment, the system cuts current to the starter. When an ECM receives the STSW signal, it turns on the ACC Cut relay, which
prevents flickering of the combination meter, clock, audio system, etc. Also, the ECM sends a signal to the ECM's STAR terminal. Then the STAR
output signal travels through the Park / Neutral Position (PNP) switch to the STARTER relay, causing the starter to activate.
When the engine is cranking, the starter operation signal is sent to the ECM's STA terminal.
