Engine Does Not Start: Description

ENGINE START SYSTEM OPERATION

A/T Models: If the engine switch is pressed with the shift lever in P or N and the brake pedal depressed, the power source control ECU determines that it is an engine start request.
M/T Models: If the engine switch is pressed with the clutch pedal depressed, the power source control ECU determines that it is an engine start request.
The certification ECU and other ECUs perform key verification via the LIN communication line.
The power source control ECU activates the ACC relay.
The power source control ECU activates the IG1 and IG2 relays. The engine switch indicator light turns green.
The certification ECU outputs a steering UNLOCK signal. The signal is sent to the steering lock ECU via the power source control ECU.
The power source control ECU sends an engine start request signal to the ECM.
The ECM sends an ACC cut request signal to the power source control ECU.
The ECM and power source control ECU activate the ST relay.
The power source control ECU deactivates the ACC relay until the ECU detects an engine start.
When engine revolution speed reaches 200 rpm, the power source control ECU determines that the engine has been started.

The ECU reactivates the ACC relay and turns off the engine switch indicator light.

ENGINE NOT START OPERATION

Symbols of power source control ECU	Signals
STP	Stop light switch ON signal
SSW1/SSW2	Engine switch ON signal
ACCD	ACCrelay operation signal
IG2D	IG2 relay operation signal
STR2	ST relay operation signal
STR1	Park/neutral position switch signal (A/T), Clutch start switch (M/T)
TACH	Engine start detection signal
STSW	Starter activation request signal
CTSW	ACC cut request signal