i-STOP (engine restart control) conditions
- Conditions for restarting the engine during i-stop control (engine stopped) are as follows:DETERMINATION CONDITIONS
Detection module Detection item Determination conditions MTX ATX 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 {2.5 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/cm 2 , 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 2.5 mm {0.098 in} or less at D position 2.5 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 ON ← 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 stopped120 s or more ← Engine stop period by i-stop
If i-stop control is performed (engine stop control) while driving135 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: -1.5m/s 2 or more ← Drive selection switch SPORT mode ← 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 (2) 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 No ← 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 ON ← System condition An i-stop related part DTC is recorded ← DSC HU/Control Module (2) Electronically controlled brake unit (2) 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.
- Conditions for restarting the engine during i-stop control (engine stopped) are as follows:DETERMINATION CONDITION
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 fluid pressure Brake fluid pressure is 0.35 MPa {3.6 kgf/cm 2 , 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) Brake stroke 2.5 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 resetShift 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 ON 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 istop If i-stop control is performed (engine stop control) while vehicle is stopped 120 s or more Engine stop period by istop 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 No 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 ON 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.
- Fuel injection control (from first time, fuel injection to specific cylinders (expansion stroke)