Toyota 2GR-FE Manual page 619

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 an ECM receives the STSW signal, it turns on the ST 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.
Start Input Signal (STSW)
Start Output Signal (STAR)
ACC Cut Input Signal
(ACCR) (for start control)
Engine Speed Signal (NE)
WIRING DIAGRAM
Refer to DTC P0617 (See page ES-305).
2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ON
OFF
ON
OFF
ON
OFF
Engine Switch ST Position
Elapse of Time
Keeps cranking until the firing
of the engine is judged
When no cranking holding
control is effected
Prevents meters, clock, etc.
from flickering
Firing judgment line
When the NE signal reaches a
predetermined value, the ECM
determines that the engine has
started successfully
ES–463
ES
A103821E19