SYMPTOM DIAGNOSTIC INDEX [SKYACTIV-G]

id1103sb000300


Diagnostic Index

•  Verify malfunction symptoms using the following diagnostic index, then go to the appropriate troubleshooting chart.

Troubleshooting item

Description
i-stop warning light (amber) illuminates
•  i-stop warning light (amber) remains illuminated while engine is running.
i-stop warning light (amber) flashes
•  i-stop function is inhibited because an i-stop control system error is detected.
i-stop indicator light (green) flashes
•  i-stop indicator light (green) remains flashing during i-stop.
i-stop function does not operate
•  i-stop function does not operate when vehicle is stopped.
i-stop function operates under no engine-stop conditions
•  i-stop function operates even though system is turned off by pressing i-stop OFF switch.
•  i-stop function operates even though vehicle conditions are for non-operation.
•  i-stop function operates frequently while parking vehicle.
Engine does not restart
•  The engine does not restart after the engine was stopped by the i-stop control.
Limited i-stop function operation time
•  Frequency of which i-stop function operates is low.
•  Frequent occurrence of engine restarting other than for driving vehicle from stop.
Ineffective operation of A/C during engine stop (i-stop system)
•  The A/C airflow temperature is too high or low compared with the set temperature while the i-stop function is operating.
Acceleration malfunction
•  Acceleration from i-stop is not smooth.
•  Suppresses (shock) when accelerating vehicle from i-stop.
•  Engine vibration increases when engine is restarted.
Vehicle moves when accelerating from standstill on slope
•  Vehicle slips backwards on inclined road surface when accelerating after i-stop operates.


i-stop Control

•  The i-stop control is designed to not function (idling stop or engine restart) while the bonnet is open, however, when performing servicing in the engine compartment while a malfunction symptom has being occurred, be careful not to get caught in a rotating part if the engine were too restart accidentally.
•  When performing troubleshooting indicated with an asterisked (*), shake the applicable part, wiring harness, and connector by hand to determine if the malfunction is temporal caused by poor contact. If there is a malfunction in the connectors or terminals, properly connect them and repair or replace if necessary. If there is a malfunction in the connectors or terminals, properly connect them and repair or replace if necessary.
•  Engine-stop permit conditions and engine restart conditions by i-stop control as follows:

Engine stop control

i-stop (engine-stop control) permit condition
•  The conditions to stop the engine by the i-stop control are as follows:

Determination module

Determination item

Determination condition
PCM
Vehicle speed
20 km/h {12 mph} or less
Brake pedal
Brake pedal is depressed while in D position
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 is 1.35 MPa {13.8 kgf/cm2, 196 psi} or more while in D position (perform correction according to vehicle inclination angle)
However, no brake fluid pressure conditions during Mazda Radar Cruise Control with Stop & Go function (MRCC with Stop & Go function) and Cruising & Traffic Support (CTS) operation*1
Brake stroke
3 mm {0.1 in} or more
Panic brake
Not operating
ABS control
Not operating
Accelerator pedal
Released
Vehicle conditions
Vehicle is stopped in D position*2
Steering speed
15 deg/s or less
Steering angle
Within 65° of center to left and right
(After EPS control module learns center value)
Steering torque
1.1 N·m {11 kgf·cm, 9.7 in·lbf} or less
i-stop OFF switch
OFF
Vehicle speed history
(After engine started and driven once)
3 km/h {2 mph} or more
Door (driver's side)
Closed
Hood
Closed *3
Vehicle inclination angle
Within ±7° when level (LON_ACCL_C: within ±0.121 G)
Seat belt (driver's side)
Fastened*4
Steering angle sensor initial setting
Completed
Engine coolant temperature
30—110 °C {86—230 °F}
Intake air temperature
100 °C {212 °F} or less
Altitude
2,000 m or less
System condition
i-stop related part DTCs are not recorded
Mazda M Hybrid battery voltage
20 V or more
Mazda M Hybrid battery condition
30 % or more
Mazda M Hybrid battery temperature
120 °C {248 °F} or less
ISG temperature
120 °C {248 °F} or less
Brake coordinated control end
Completed
Deceleration request
MRCC in operation
Drive selection switch
Other than SPORT mode
BCM
+B (ROOM fuse) input
Yes
IG1 input
Yes
ACC input
Yes
IG1 output
Yes
ACC output
Yes
BCM
Push button
Not pressed
Door (all)
Closed
Liftgate
Closed
Seat belt (driver's side)
Fastened*4
Engine start
Engine was started by operating push button with key inside cabin (engine started first time)
Engine rotation speed
300 rpm or more is maintained after engine started
System condition
i-stop related part DTCs are not recorded
TCM
TCM detection condition
All met (I-Stop_EST: On)
Panic stop
Brake pedal was not depressed suddenly within 4 s
TFT
20―117 °C {68—242 °F}
Gear position
Not in 2nd gear fixed mode
System condition
i-stop related part DTCs are not recorded
Dash-electrical supply unit
Dash-electrical supply unit determination condition
•  All met
(STOP_ST: Available)
Cabin temperature
Difference between target cabin temperature and actual cabin temperature is a certain value or less
(Cabin temperature control by A/C is normally performed)
A/C temperature
Setting other than MAX/MIN
Ambient temperature
-10―50 °C {14—122 °F}
Cold condition
Ambient temperature is 4 °C {39 °F} or more or evaporator temperature is 12 °C {54 °F} or less
Front defroster switch
OFF
Electronically controlled brake unit
Operation request from PCM
Hill Launch Assist (HLA) control request signal from PCM is received
Vehicle inclination angle
Inclination is within ±6° with shift positioned in D/R or N/P (LON_ACCL_C: within ±0.104 G)
Wheel speed (4 wheels)
0 km/h {0 mph}
Brake pedal
Brake pedal is depressed
Brake fluid pressure
Approx. 0.45 MPa {4.6 kgf/cm2, 65 psi} or more
Accelerator pedal
Released
System condition
i-stop related part DTCs are not 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 stopped by i-stop control without having to depress the brake pedal.
*2  :After the vehicle is stopped, the engine stops if the gear is shifted to N position. In addition, if the gear is shifted to P position after the vehicle is stopped in D position, the engine stop condition by the i-stop control is maintained.
*3  :If the engine is started with the hood open, i-stop is inhibited until the engine is stopped.
*4  :If the seat belt is unfastened while the vehicle is stopped, i-stop is inhibited until a vehicle speed record is input once.
i-stop (engine stop control)
•  When the i-stop (engine stop control) permit conditions are met, the PCM stops the engine based on the following controls:
―  Fuel injection control (fuel cut)
•  Engine speed is reduced by the fuel cut.
―  Drive-by-wire control (throttle valve open/closed)
•  By adjusting the throttle valve opening angle, the engine speed is reduced and the pumping loss is used to stop the engine.
―  Electric variable valve timing control (intake valve timing retard)
•  Intake valve timing retard is performed for engine restart by i-stop control.


Engine restart control

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

Detection module

Detection item

Determination conditions
PCM
Vehicle speed
1 km/h {0.6 mph} or more
Brake pedal
•  Brake pedal is released → depressed while in P or N position
•  Brake pedal is released while in D 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 stroke
2.5mm {0.098 in} or less at D position
Panic brake
Operating
ABS control
Operating
Other system
Vehicle roll prevention function is not operating at D position
Accelerator pedal
Accelerator pedal is depressed while in D or M or N or P position
Steering torque
2.8 N·m {29 kgf·cm, 25 in·lbf} or more while in D position
Steering angle
±20° or more
Steering angle sensor initial setting
Learning reset
Shift operation
Operated from P or N position to D position
Operated R 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
―  Hood: Open
Hood
Open
Engine stop period by i-stop
120 s or more
Engine coolant temperature
55 °C {131 °F} or less
System condition
An i-stop related part DTC is recorded
MRCC deceleration request
MRCC in operation: -1.5 m/s2 or more
Drive selection switch
SPORT mode
Mazda M Hybrid battery voltage
16 V or less
Mazda M Hybrid battery condition
25 % or less
Mazda M Hybrid battery temperature
60 °C {140 °F} or less
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
Yes
A/C set temperature
Set to MAX or MIN
Front defroster switch
ON
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.