Matrix FWD L4-1.8L (2ZR-FE) (2010)
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Starter Motor: Testing and Inspection
Cranking Holding Function Circuit
2ZR-FE ENGINE CONTROL: SFI SYSTEM: Cranking Holding Function Circuit
- Cranking Holding Function Circuit
DESCRIPTION
The cranking holding control system keeps 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 CUT relay during
cranking to prevent flickering of the combination meter, clock, audio system, and other areas.
When the ECM detects the STSW signal, the ECM outputs the starter relay drive signal (STAR signal) to the starter relay through the clutch pedal
switch assembly or park/neutral position switch, and then the engine is cranked. When the ECM receives a stable engine speed signal (NE signal) (more
specifically, when the NE signal reaches a predetermined value), the ECM stops outputting the STAR signal. Also, the ECM monitors the ST relay
operating conditions based on the STA terminal voltage status.
WIRING DIAGRAM
