i-stop CONTROL OPERATION [MZR 2.0 DISI i-stop]

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Engine stop control

Engine stop control permit conditions (MTX)

•  The conditions for stopping the engine using the i-stop control are as follows:

PURPOSE	CONDITION ITEM
Driveability	Vehicle speed	3 km/h {2 mph} or less
	Accelerator pedal opening angle	Fully closed
	Clutch pedal opening angle	30% or less
	Gear position	Neutral
Marketability	Cabin temperature	Climate control unit command (See AIR CONDITIONER i-stop CONTROL OPERATION [FULL-AUTO AIR CONDITIONER].)
	A/C temperature	Climate control unit command (See AIR CONDITIONER i-stop CONTROL OPERATION [FULL-AUTO AIR CONDITIONER].)
	Ambient temperature	-10—50 °C {14—122 °F}
	Steering wheel operation speed	30 °/s or less (EHPAS after learning center value)
	i-stop OFF switch	OFF
	Vehicle speed record	4 km/h {2.4 mph} or more
	Advanced key	Must be verifiable (The i-stop operation is also inhibited if the battery for the advanced key is depleted.)
Safety	Battery charge status	After engine start, full charge determined/not in charge recovery.
	Battery fluid temperature	0—70 °C {32—158 °F}
	Defroster switch	OFF
	Front/rear window thermal filaments	OFF
	Power brake unit vacuum	-47 kPa {-353 mmHg, -14 inHg} or less
	Door switch	OFF
	Hood switch	ON
	Seat belt	Fastened
	System status	i-stop related module normal
System restrictions	Engine speed (during engine-stop control)	750 rpm
	Number of times starter is operated	Within 180,000 times
	Number of times starter relay operated	Within 180,000 times
	Time until engine-stop by i-stop control from vehicle stop	0.5 s or more
Engine status	Engine coolant temperature	55—110 °C {131—230 °F}
	Intake air temperature	100 °C {212 °F} or less
Environment status	Elevation	1,800 m {5906 ft} (+300 m {984 ft}) or less

Engine stop control permit conditions (ATX)

•  The conditions for stopping the engine using the i-stop control are as follows:

PURPOSE	CONDITION ITEM
Driveability	Vehicle speed	0 km/h {0 mph}
	Brake switch	ON (if ABS operates during deceleration, i-stop operation is inhibited.)
	Brake fluid pressure	1.17 MPa {11.9 kgf/cm2, 170 psi} or more (pedal force sufficient to suppress vehicle lurch when engine is restarted)
	Accelerator pedal opening angle	Fully closed
	Vehicle status	Vehicle is stopped in D-range
Marketability	Cabin temperature	Climate control unit command (See AIR CONDITIONER i-stop CONTROL OPERATION [FULL-AUTO AIR CONDITIONER].)
	A/C temperature	Climate control unit command (See AIR CONDITIONER i-stop CONTROL OPERATION [FULL-AUTO AIR CONDITIONER].)
	Ambient temperature	-10—50 °C {14—122 °F}
	Steering wheel operation speed	10 °/s or less (EHPAS after learning center value)
	Steering angle	-65—65 ° (center) (EHPAS standardizes value after learning center value)
	i-stop OFF switch	OFF
	Vehicle speed record	3km/h {2 mph} or more
	Advanced key	Must be verifiable (If the auxiliary key is used, the i-stop operation is inhibited. The i-stop operation is also inhibited if the battery for the advanced key is depleted.)
Safety	Battery charge status	After engine start, full charge determined/not in charge recovery.
	Battery fluid temperature	0—70 °C {32—158 °F}
	Defroster switch	OFF
	Front/rear window thermal filaments	OFF
	Power brake unit vacuum	-47 kPa {-353 mmHg, -14 inHg} or less
	Door switch	OFF
	Hood switch	ON
	Vehicle inclination angle	Within + 12% at horizontal
	Seat belt	Fastened
	System status	i-stop related module normal
System restrictions	Time from engine start	8 s or more
	Number of times starter is operated	Within 180,000 times
	Number of times starter relay operated	Within 180,000 times
	Time until engine-stop by i-stop control from vehicle stop	0.8 s or more
Engine status	Engine coolant temperature	55—110 °C {131—230 °F}
	Intake air temperature	100 °C {212 °F} or less
	ATF temperature	40—110 °C {104—230 °F}
Environment status	Elevation	1,500 m {4921 ft} (+300 m {984 ft}) or less

Engine-stop control

•  When the engine-stop control permit conditions are met, the PCM stops the engine based on the following controls:

―  Fuel injection control (Fuel cut)

•  The engine speed is lowered by fuel cut.

―  Drive-by-wire control (throttle valve open/closed)

•  The engine speed is lowered by adjusting the throttle valve opening angle and the engine is stopped using pumping loss.

―  Generator output control (generator load)

•  The engine speed is lowered by reducing the generator load.

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Engine restart control

Engine restart control conditions (MTX)

•  The conditions for restarting the engine during i-stop control (engine stop) are as follows.

IS: Engine stops via i-stop control

IR: Engine restarts via i-stop control

PURPOSE	CONDITION ITEM	VECHICLE STATUS
		NEUTRAL	IN GEAR
Driver operation	Door opened	Beeper warning and IS control (engine-stop) continues
	Accelerator pedal depressed	IS control (engine-stop) continues
	Clutch pedal depressed	IR
Marketability	A/C command	IR	IS continues
	A/C temperature MAX setting	IR	IS continues
	Battery command (battery charge status)	IR	IS continues
	i-stop OFF switch ON	IR	IS continues
	Advanced key removed after door opened (Driver seat belt fastened/door closed conditions)	IR	IS continues
Safety	Defroster switch ON	IR	IS continues
	Front/rear window heater filaments ON	IR	IS continues
	Battery command (battery life)	IR	IS continues
	Power brake unit vacuum: -45 kPa {-338 mmHg, -13 inHg} or more	IR	IS continues
	Vehicle speed: 4 km/h {2.4 mph} or more	IR	IS continues
	Hood opened	Engine stall	Engine stall
	Door opened and seat belt unfastened	Engine stall	Engine stall

Engine restart control conditions (ATX)

•  The conditions for restarting the engine during i-stop control (engine stop) are as follows.

IR: Engine restarts via i-stop control

PURPOSE	CONDITION ITEM		VECHICLE STATUS
Driver operation	Brake pedal is not depressed		IR
	Accelerator pedal depressed		IR
	Steering wheel operation speed (D-range):70 °/s or more*1		IR
	Steering angle (D-range): except -70—70 ° (center)*1		IR
	Shift operation	D-range to M or R position	IR
		N-range to D or R position	IR
		R-range to D or R position	IR
Marketability	A/C command		IR
	A/C temperature MAX setting		IR
	Battery command (battery charge status)		IR
	i-stop OFF switch ON		IR
	Advanced key removed after door opened (Driver seat belt fastened/door closed conditions)		IR
Safety	Defroster switch ON		IR
	Front/rear window heater filaments ON		IR
	Brake pedal depression increase		IR
	Battery command (battery life)		IR
	Power brake unit vacuum: -45 kPa {-338 mmHg, -13 inHg} or more		IR
	Vehicle speed: 1 km/h {0.6 mph} or more		IR
	Electric AT oil pump driver: Drive time 120 s or more		IR

Engine restart control

•  When the engine restart control conditions are met, the PCM restarts the engine based on the following conditions:

―  Fuel injection control (fuel injection to specific cylinders (at initial point in expansion process))

•  From initial injection, fuel injected by pinpoint to cylinder during expansion process.During i-stop control (engine-stop), the PCM completes identification of cylinders based on the signal from the crankshaft position sensor and enables fuel injection to cylinders at the initial point in the expansion process.

―  Two-battery power supply system (sub battery electrical power)

•  When the engine restarts by i-stop control, electrical power supplied by the sub battery drives the starter.

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Indicator Light Command (MTX)

Classification		Operation conditions	Vehicle status	i-stop indicator/warning display			Other	Buzzer
				Illuminates	Flashes		Illuminates
					0.5 s	0.25 s
Directly after vehicle stop	IS enable condition from vehicle	IS conditions not met	IS inhibited (idle)	—	—	—	—	—
		IS conditions met	IS	Green	—	—	—	—
i-stop (engine-stop)	IS permit status		IS continues	Green	—	—	—	—
	IR command via driver operation	Clutch pedal depressed (neutral)	IR	—	—	—	—	—
	Switch to unsafe status via driver operation	In gear	IS continues	—	—	Green	—	—
		Door opened	IS continues	—	—	Green	—	0.25 s intervals
		Seat belt unfastened and door opened	Engine stall	Amber *1	—	Green *1	Indicator/warning all illuminated	0.25 s intervals
		Hood opened	Engine stall	Amber	—	—	Indicator/warning all illuminated	—
	IR via vehicle command	•  Battery command •  Climate control command •  Defroster switch ON •  Front/rear window thermal filaments ON	IR	—	Green *2	—	—	—
		•  Vehicle moves on road incline •  Power brake unit vacuum reduced •  Battery life	IR	—	—	—	—	—
		Advanced key outside of vehicle	IR	—	—	—	—	Keyless control module Normal buzzer
	IR error	Engine restart (permitted 3 times)	IS continues	Green	—	—	—	—
	IR not possible	Engine restart (failure 3 times)	Engine stall	Amber	—	—	—	—
i-stop OFF switch operation	i-stop OFF operation	i-stop OFF switch ON (long press, 0.5 s or more)	IS not possible	Amber	—	—	—	Beep 1 time
	i-stop recover operation	i-stop OFF switch OFF (long press, 0.5 s or more)	IS permitted	Amber*3	—	—	—	Beep 1 time
Malfunction	System malfunction		IS not permitted (idle)	—	Amber	—	—	—

Indicator Light Command (ATX)

Classification		Operation conditions	Vehicle status	i-stop indicator (Green)/warning display (Amber)			Indicator (other)	Buzzer
				Illuminates	Flashes (0.5s)	Off	Illuminates
Driving	IS conditions not met		—	—	—	×	—	—
	IS conditions met*7		—	Green	—	—	—	—
Vehicle parked	IS conditions not met*7		idle	—	Green*1	—	—	—
				—	—	×	—	—
	IS conditions met*7		IS	Green	—	—	—	—
i-stop function is operating	IS continues normally	The following conditions are met •  Brake depressed •  D-range •  Steering wheel angle within 70 °	IS continues	Green	—	—	—	—
		The following conditions are met •  Brake released •  D-range to N position •  D-range→N position→P position •  Steering wheel angle within 70 °					—	—
	IR request (driver’s operation)	The following conditions are met •  Brake released •  D-range •  Steering wheel angle is 70 ° or more •  Evasive steering	IR	—	—	×*2	—	—
		The following conditions are met •  Brake released •  N-range to D position •  Steering wheel angle is 70 ° or more •  Evasive steering					—	—
		The following conditions are met •  Brake depressed •  D-range to M position •  Steering wheel angle is 70 ° or more •  Evasive steering					—	—
	Switches to unsafe condition (driver’s operation)	•  Door, liftgate, or trunk opened	IS continues	—	—	—	—	0.25 s intervals
		•  Seat belt unfastened and door opened •  Driver seat belt unfastened	Engine stall	Amber	—	—	Same illumination as normal engine stall condition	0.25 s intervals
		•  Hood opened	Engine stall	Amber	—	—	Same illumination as normal engine stall condition	—

Classification		Operation conditions	Vehicle status	i-stop indicator (Green)/warning display (Amber)			Indicator (other)	Buzzer
				Illuminates	Flashes (0.5s)	Off	Illuminates
i-stop function is operating	IR request (vehicle request)	•  Battery command •  Climate control command •  Vehicle moves on road incline •  Power brake unit vacuum reduced	IR	—	—	×*2	—	—
		Advanced key outside of vehicle	IR	—	—	×*2	×*6	Keyless control module Normal buzzer
	IR not possible	•  Cranking for 3 s or more when engine restarts	Engine stall	Amber	—	—	Same illumination as normal engine stall condition	—
IS implement permit/inhibit		•  i-stop OFF switch ON	IS not possible	Amber*3	—	—	—	Beep 1 time
		•  i-stop OFF switch OFF	IS permitted	Amber*4	—	—	—	Beep 1 time
System malfunction			IS not permitted	—	Amber*5	—	—	—

i-stop indicator light (green) illumination/flashing condition

•  The illumination/flashing conditions of the i-stop indicator light (green) differ depending on the i-stop (engine-stop control) permit condition.

•  The illumination/flashing conditions of the i-stop indicator light (green) are as follows:

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i-stop indicator light (green) illumination/flashing condition determination	i-stop (engine-stop control) permit condition item
A	Vehicle status	Vehicle is stopped in D-range
	Cabin temperature	Climate control unit command (See AIR CONDITIONER i-stop CONTROL OPERATION [FULL-AUTO AIR CONDITIONER].)
	A/C temperature	Climate control unit command (See AIR CONDITIONER i-stop CONTROL OPERATION [FULL-AUTO AIR CONDITIONER].)
	Ambient temperature	-10—50 °C {14—122 °F}
	i-stop OFF switch	OFF
	Vehicle speed record	3km/h {2 mph} or more
	Battery charge status	After engine start, full charge determined/not in charge recovery.
	Battery fluid temperature	0—70 °C {32—158 °F}
	Defroster switch	OFF
	Front/rear window thermal filaments	OFF
	Door switch	OFF
	Hood switch	ON
	Seat belt	Fastened
	System status	i-stop related module normal
	Time from engine start	8 s or more
	Number of times starter is operated	Within 180,000 times
	Number of times starter relay operated	Within 180,000 times
	Engine coolant temperature	55—110 °C {131—230 °F}
	Intake air temperature	100 °C {212 °F} or less
	ATF temperature	40—110 °C {104—230 °F}
	Elevation	1,500 m {4921 ft} (+300 m {984 ft}) or less
B	Vehicle speed	0 km/h {0 mph}
	Brake switch	ON (if ABS operates during deceleration, i-stop operation is inhibited.)
	Accelerator pedal opening angle	Fully closed
	Steering wheel operation speed	10 °/s or less (EHPAS after learning center value)
	Steering angle	-65—65 ° (center) (EHPAS standardizes value after learning center value)
	Advanced key	Must be verifiable (If the auxiliary key is used, the i-stop operation is inhibited. The i-stop operation is also inhibited if the battery for the advanced key is depleted.)
	Power brake unit vacuum	-47 kPa {-353 mmHg, -14 inHg} or less
	Vehicle inclination angle	Within + 12% at horizontal
	Time until engine-stop by i-stop control from vehicle stop	0.8 s or more
C	Brake fluid pressure	1.17 MPa {11.9 kgf/cm2, 170 psi} or more (pedal force sufficient to suppress vehicle lurch when engine is restarted)

Two-battery power supply system

Power relay

―  Supplies the power supply from the main battery to the starter.

Power drive relay

―  Supplies the power relay excitation current.

Charge relay

―  Connects the sub-battery and generator when charging the sub battery.

Engine start

•  When the engine is started, the starter operates by the power supply from the main and sub-batteries.

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While driving

•  The charge relay turns on and charging of the sub battery is performed.

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Engine stop control

•  The sub battery circuit is blocked, and supply of power is performed by the main battery only.

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Engine restart control

•  The starter is operated using the sub battery only.

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Sub battery malfunction

•  If the sub battery has a malfunction, the starter operates using the main battery.

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Electric AT oil pump driver control (ATX)

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System warning diagram

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