Engine restart control

i-stop (engine restart control) conditions

Conditions for restarting the engine during i-stop control (engine stopped) are as follows:

I-STOP (ENGINE RESTART CONTROL) CONDITIONS - DETECTION ITEM DESCRIPTION

Detection module

Detection item

Determination conditions

ATX

MTX

PCM

Vehicle speed
If i-stop control is performed (engine stop control) while vehicle is stopped

1 km/h {0.6 mph} or more

4 km/h {VIN M mph} or more

Vehicle speed
If i-stop control is performed (engine stop control) while driving

30 km/h {19 mph} or more

11 km/h {6.8 mph} or more

Brake pedal

Brake pedal is released depressed while in P or N position
Brake pedal is released while in D or M position and AUTOHOLD is not operating
However, no brake pedal conditions during Mazda Radar Cruise Control with Stop & Go function (MRCC with Stop & Go function) and Cruising & Traffic Support (CTS) operation ⁽¹⁾

Not applicable

Brake fluid pressure Except European specs. with Mazda M Hybrid

Brake fluid pressure Brake fluid pressure is 0.35 MPa {3.6 kgf/cm² , 51 psi} or less while in D or M position and AUTOHOLD is not operating. However, no brake fluid conditions during Mazda Radar Cruise Control with Stop & Go function (MRCC with Stop & Go function) operation ⁽¹⁾

Not applicable

Brake fluid pressure European specs. with Mazda M Hybrid

Not applicable

Brake fluid pressure is 0.2 MPa {2 kgf/cm² , 29 psi} or less

Brake stroke

VIN M mm {0.098 in} or less at D position

VIN M mm {0.098 in} or less

Panic brake

Operating

←

ABS control

Operating

←

Other system

Vehicle roll prevention function is not operating at D position

Not applicable

Accelerator pedal

Accelerator pedal is depressed while in D or M position

Not applicable

Clutch pedal

Not applicable

Depressed

Steering torque

4.0 N.m {41 kgf.cm, 35 in.lbf} or more while in D or M position

Not applicable

Steering angle
If i-stop control is performed (engine stop control) while vehicle is stopped

70° or more from center while in D or M position (After EPS control module learns center value)

Not applicable

Steering angle
If i-stop control is performed (engine stop control) while driving

Absolute steering angle: Within ±20°

Not applicable

Steering angle initial setting

When any of the following conditions is met

Learning reset

←

Shift operation
If i-stop control is performed (engine stop control) while driving

Other than D position

Not applicable

i-stop OFF switch

←

PCM

Driver not seated

European specs.

All the following conditions are met:
- Seat belt (driver's side): Not fastened
- Door (driver's side): Open

Except for European specs.

All the following conditions are met:
- Seat belt (driver's side): Not fastened
- Door (driver's side): Open
- P or N position

European specs.

Seat belt (driver's side): Not fastened

Except for European specs.

All the following conditions are met:
- Seat belt (driver's side): Not fastened
- Door (driver's side): Open
- Neutral

Shift operation
If i-stop control is performed (engine stop control) while vehicle is stopped

Operated from P or N position to D, M, or R position

Not applicable

Engine stop period by i-stop
If i-stop control is performed (engine stop control) while vehicle is stopped

120 s or more

←

Engine stop period by i-stop
If i-stop control is performed (engine stop control) while driving

135 s or more

←

Engine coolant temperature

European specs., Australian specs. and with Mazda M Hybrid:

55°C {131°F} or less

Except for European specs., Australian specs. or with Mazda M Hybrid:

25°C {77°F} or less

←

System condition

An i-stop related part DTC is recorded

←

MRCC request deceleration speed

MRCC is operating: -1.5 m/s ² or more

←

Drive selection switch

SPORT mode

Not applicable

Battery charge condition ⁽²⁾

65 % or less

←

Power brake unit vacuum ⁽²⁾

-47.8 kPa {-0.487 kgf/cm ² , -6.93 psi} or more (value calculated by subtracting BARO from BBP)

←

Mazda M Hybrid battery voltage ⁽³⁾

16 V or less

←

Mazda M Hybrid battery condition ⁽³⁾

25 % or less

←

Mazda M Hybrid battery temperature ⁽³⁾

60°C {140°F} or more

←

BCM

+B (ROOM fuse) input

←

Remote transmitter authorization

When engine restart by remote transmitter authorization is requested

Any door is open without remote transmitter left in vehicle
Remote transmitter is outside of vehicle after any door is opened

←

System condition

An i-stop related part DTC is recorded

←

TCM

Gear position

In 2nd gear fixed mode

Not applicable

TFT

20°C {68°F} or less, or 117°C {243°F} or more

Not applicable

Vehicle speed

3 km/h {2 mph} or more

Not applicable

System condition

An i-stop related part DTC is recorded

←

Dash-electrical supply unit

A/C request (with full-auto A/C)

Yes

←

A/C set temperature (with full-auto A/C)

Set to MAX or MIN

←

Front defroster switch

←

System condition

An i-stop related part DTC is recorded

←

DSC HU/Control Module ⁽²⁾ Electronically controlled brake unit ⁽³⁾

System condition

An i-stop related part DTC is recorded

Not applicable

⁽¹⁾	During Mazda Radar Cruise Control with Stop & Go function (MRCC with Stop & Go function) and Cruising & Traffic Support (CTS) operation, the engine is not restarted by i-stop control even if the brake pedal is released.

⁽²⁾	without Mazda M Hybrid

⁽³⁾	with Mazda M Hybrid

i-stop (engine restart control)

When the i-stop (engine restart control) conditions are met, the PCM restarts the engine by the following controls:
- Fuel injection control (from first time, fuel injection to specific cylinders (expansion stroke)
  - Fuel is injected to cylinders which are determined to be stopped at the expansion stroke. During i-stop control (engine stop), cylinders are identified based on the signal from the crankshaft position sensor and fuel injection is enabled to those cylinders which are identified first as being stopped in the expansion stroke.
- DC-DC converter control
  - When the engine is restarted by the i-stop control, the battery voltage is decreased to operate the starter by supplying power from the battery. When the starter operates, the supply voltage for electronic devices is increased by the DC-DC converter.

i-stop (engine restart control) conditions

Conditions for restarting the engine during i-stop control (engine stopped) are as follows:

I-STOP (ENGINE RESTART CONTROL) CONDITIONS - DETECTION ITEM DESCRIPTION

Detection module

Detection item

Determination conditions

PCM

Vehicle speed
If i-stop control is performed (engine stop control) while vehicle is stopped

1 km/h {0.6 mph} or more

Vehicle speed
If i-stop control is performed (engine stop control) while driving

30 km/h {19 mph} or more

Brake pedal

Brake pedal is released depressed while in P or N position
Brake pedal is released while in D or M position and AUTOHOLD is not operating
However, no brake pedal conditions during Mazda Radar Cruise Control with Stop & Go function (MRCC with Stop & Go function) and Cruising & Traffic Support (CTS) operation ⁽¹⁾

Brake fluid pressure

Brake stroke

VIN M mm {0.098 in} or less at D position

Panic brake

Not operating

ABS control

Not operating

Other system

Vehicle roll prevention function is not operating at D position

Accelerator pedal

Accelerator pedal is depressed while in D, M or N position

Clutch pedal

Not applicable

Steering torque

4.0 N.m {41 kgf.cm, 35 in.lbf} or more while in D or M position

Steering angle
If i-stop control is performed (engine stop control) while vehicle is stopped

70° or more from center while in D or M position (After EPS control module learns center value)

Steering angle
If i-stop control is performed (engine stop control) while driving

Absolute steering angle: Within ±20°

Steering angle initial setting

When any of the following conditions is met

Learning reset

Shift operation
If i-stop control is performed (engine stop control) while vehicle is stopped

Operated from P or N position to D, M, or R position

Shift operation
If i-stop control is performed (engine stop control) while driving

Other than D position

i-stop OFF switch

Driver not seated

All the following conditions are met:
- Seat belt (driver's side): Not fastened
- Door (driver's side): Open
- P or N position

Trunk lid

Opened

Engine stop period by i-stop
If i-stop control is performed (engine stop control) while vehicle is stopped

120 s or more

Engine stop period by i-stop
If i-stop control is performed (engine stop control) while driving

135 s or more

Engine coolant temperature

25°C {77°F} or less

System condition

An i-stop related part DTC is recorded

MRCC request deceleration speed

Deceleration request by MRCC is canceled

Drive selection switch

SPORT mode

Mazda M Hybrid battery voltage

16 V or less

PCM

Mazda M Hybrid battery condition

25 % or less

Mazda M Hybrid battery temperature

60°C {140°F} or more

BCM

+B (ROOM fuse) input

Remote transmitter authorization

When engine restart by remote transmitter authorization is requested

Any door is open without remote transmitter left in vehicle
Remote transmitter is outside of vehicle after any door is opened

System condition

An i-stop related part DTC is recorded

TCM

Gear position

In 2nd gear fixed mode

TFT

20°C {68°F} or less, or 117°C {243°F} or more

Vehicle speed

3 km/h {2 mph} or more

System condition

An i-stop related part DTC is recorded

Dash-electrical supply unit

A/C request (with full-auto A/C)

Yes

A/C set temperature (with full-auto A/C)

Set to MAX or MIN

Front defroster switch

System condition

An i-stop related part DTC is recorded

Electronically controlled brake unit

System condition

An i-stop related part DTC is recorded

⁽¹⁾	During Mazda Radar Cruise Control with Stop & Go function (MRCC with Stop & Go function) and Cruising & Traffic Support (CTS) operation, the engine is not restarted by i-stop control even if the brake pedal is released.

i-stop (engine restart control)

When the i-stop (engine restart control) conditions are met, the PCM restarts the engine by the following controls:
- Fuel injection control (from first time, fuel injection to specific cylinders (expansion stroke)
  - Fuel is injected to cylinders which are determined to be stopped at the expansion stroke. During i-stop control (engine stop), cylinders are identified based on the signal from the crankshaft position sensor and fuel injection is enabled to those cylinders which are identified first as being stopped in the expansion stroke.
- DC-DC converter control
  - When the engine is restarted by the i-stop control, the battery voltage is decreased to operate the starter by supplying power from the battery. When the starter operates, the supply voltage for electronic devices is increased by the DC-DC converter.