NO.4 i-stop FUNCTION DOES NOT OPERATE [SKYACTIV-G 2.5T]

id1103b2000900

4

i-stop FUNCTION DOES NOT OPERATE
DESCRIPTION
•  i-stop function does not operate when vehicle is stopped.
POSSIBLE CAUSE
•  The i-stop (engine stop control) permit conditions are not met due to either of the following causes:
?  Driver operation
?  Environment (problem other than with vehicle)
?  i-stop related part malfunction
Note
•  PIDs related to i-stop can be displayed in a list using the M-MDS data monitor diagnostic function.
•  If the engine is stopped by the i-stop control while the following data monitor items on the M-MDS are being viewed, the data monitor items may no longer be displayed.
?  BRAKE_SW
?  BRK_F_P_C
?  LON_ACCL_C
?  WSPD_SEN_LF
?  WSPD_SEN_RF
?  WSPD_SEN_LR
?  WSPD_SEN_RR

i-stop (engine-stop control) permit condition

Determination module

Determination item

Determination condition

Applicable PID

Inspection item(s)
PCM
Vehicle speed
0 km/h {0 mph}
WSPD_SEN_LF
•  Front ABS wheel-speed sensor
WSPD_SEN_RF
WSPD_SEN_LR
•  Rear ABS wheel-speed sensor
WSPD_SEN_RR
Brake pedal
Brake pedal is depressed while in D or M position.
However, no brake pedal conditions during Mazda Radar Cruise Control with Stop & Go function (MRCC with Stop & Go function) operation*1
TR
•  Transaxle range sensor
BPA
•  Brake switch
PCM
Brake fluid pressure
Brake fluid pressure is 1.35 MPa {13.8 kgf/cm2, 196 psi} or more while in D or M position. (Perform correction according to vehicle inclination angle)
However, no brake fluid conditions during Mazda Radar Cruise Control with Stop & Go function (MRCC with Stop & Go function) operation*1
TR
•  Transaxle range sensor
BRK_F_P_C
•  Brake fluid pressure sensor
Accelerator pedal
Released
APP
•  APP sensor
Vehicle conditions
Vehicle is stopped in D position*2
TR
•  Transaxle range sensor
Steering speed
15 deg/s or less
STR_ROT_SPD
•  EPS control module
Steering angle
Within 65 ° of center to left and right
(After EPS control module learns center value)
STR_AB_EST
Steering torque
1.1 N·m {11 kgf·cm, 9.7 in·lbf} or less
STR_TRQ_S_M
i-stop OFF switch
OFF
I-Stop_OFF
•  i-stop OFF switch
Vehicle speed history
(After engine started and driven once)
3 km/h {2 mph} or more
I-Stop_VSP
•  PCM
DC-DC converter (i-ELOOP) output current (with i-ELOOP)
25 A or less
DCDC_OUT_A
•  DC-DC converter (i-ELOOP)
i-ELOOP bypass mode operation condition (with i-ELOOP)
Bypass mode is not operated (BYPS_STAT: Bypass Off)
BYPS_STAT
Capacitor (i-ELOOP) voltage (with i-ELOOP)
14 V or more
DCDC_IN_V
PCM
Battery charge condition
65.72 % or more
BATT_SOC
•  Current sensor
•  Battery
Battery fluid temperature
0—70 °C {32—158 °F}
BATT_TEMP
Battery voltage
11.2 V or more
BATT_V
Power brake unit vacuum
?49.8 kPa {?0.508 kgf/cm2, ?7.22 psi} or less
(value calculated by subtracting BARO from BBP)
BBP
•  Power brake unit vacuum sensor
BARO
•  BARO sensor
Door (driver's side)
Closed
DOOR_D
•  Front door latch switch (LH)
Bonnet
Closed*3
HOOD
•  Bonnet latch switch
Vehicle inclination angle
Within ±7 ° when level (LON_ACCL_C: within ±0.121 G)
LON_ACCL_C
•  SAS control module
Seat belt (driver's side)
Fastened*4
SEAT_B_D
•  Driver-side buckle switch
Battery condition setting
Completed
Not applicable
Not applicable
Steering angle sensor initial setting
Completed
Not applicable
Not applicable
Engine coolant temperature
55—110 °C {131—230 °F}
ECT
•  ECT sensor
Intake air temperature
100 °C {212 °F} or less
IAT
•  IAT sensor No.1
PCM
Altitude
1,800 m or less (BARO: 81.5 kPa {0.831 kgf/cm2, 11.8 psi} or more)
Not applicable
Not applicable
System condition
i-stop related part DTCs are not recorded
Not applicable
Not applicable
Start stop unit
B+ (ROOM fuse) input
Yes
VPWR_B1
•  Start stop unit
•  Battery
IG1 input
Yes
VPWR_IG1
•  Start stop unit
•  IG1 relay
•  Battery
ACC input
Yes
VPWR_ACC
•  Start stop unit
•  ACC relay
•  Battery
IG1 output
Yes
RELAY_IG1
•  IG1 relay
ACC output
Yes
RELAY_ACC
•  ACC relay
Push button
Not pressed
SSB_1
•  Push button start
SSB_2
Door (all)
Closed
DOOR_ALL
•  Door latch switch
Liftgate
Closed
TRUNK
•  Liftgate latch switch
Seat belt (driver's side)
Fastened*4
SEAT_B_D
•  Driver-side buckle switch
Engine start
Engine was started by operating push button with key inside cabin (engine started first time)
Not applicable
Not applicable
Engine rotation speed
300 rpm or more is maintained after engine started
Not applicable
Not applicable
System condition
i-stop related part DTCs are not recorded
Not applicable
Not applicable
TCM
TCM detection condition
All met (I-Stop_EST: On)
I-Stop_EST
•  TCM
Panic stop
Brake pedal was not depressed suddenly within 4 s
Not applicable
Not applicable
TFT
20?117 °C {68—242 °F}
TFT
•  TFT sensor
Gear position
Not in 2nd gear fixed mode
Not applicable
Not applicable
System condition
i-stop related part DTCs are not recorded
Not applicable
Not applicable
Climate control unit
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)
Not applicable
Not applicable
A/C temperature
Setting other than MIN*5
Not applicable
Not applicable
Ambient temperature
?10?50 °C {14—122 °F}
Not applicable
Not applicable
MODE switch
Except DEFROSTER
Not applicable
Not applicable
Airflow volume control switch
Except MAX setting*6
Not applicable
Not applicable
System condition
i-stop related part DTCs are not recorded
Not applicable
Not applicable
DSC HU/CM
Operation request from PCM
Hill Launch Assist (HLA) control request signal from PCM is received
Not applicable
Not applicable
Wheel speed (4 wheels)
0 km/h {0 mph}
WSPD_SEN_LF
•  Front ABS wheel-speed sensor
WSPD_SEN_RF
WSPD_SEN_LR
•  Rear ABS wheel-speed sensor
WSPD_SEN_RR
Brake pedal
Brake pedal is depressed
BRAKE_SW
•  Brake switch
Brake fluid pressure
Approx. 0.5 MPa {5 kgf/cm2, 73 psi} or more
BRK_F_P_C
•  Brake fluid pressure sensor
Accelerator pedal
Released
APP
•  APP sensor
System condition
i-stop related part DTCs are not recorded
Not applicable
Not applicable
*1   :During Mazda Radar Cruise Control with Stop & Go function (MRCC with Stop & Go function) 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 selector lever is shifted to N position. In addition, if the selector lever 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 bonnet 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.
*5   :When the A/C set temperature is set to MAX, the PCM may inhibit the i-stop control.
*6   :When all of the other i-stop permit conditions related to the climate control unit are met even if the airflow volume control switch is on, the i-stop control is permitted.

Diagnostic Procedure

STEP

INSPECTION

RESULTS

ACTION
1
VERIFY DTCs
•  Retrieve the PCM, TCM, DSC HU/CM, climate control unit and start stop unit DTCs using the M-MDS.
•  Is a DTC displayed?
Yes
Repair the malfunctioning location according to the applicable DTC troubleshooting.
(See DTC TABLE [PCM (SKYACTIV-G 2.5T)])
(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [TCM (GW6A-EL, GW6AX-EL)])
(See DTC TABLE [DSC HU/CM])
(See DTC TABLE [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)
(See DTC TABLE [START STOP UNIT])
No
Go to the next step.
2
VERIFY i-stop (ENGINE-STOP CONTROL) PERMIT CONDITION ITEMS
Warning
•  To prevent an accident, work with two people when the vehicle is being driven (one person drives vehicle, other person operates M-MDS).
•  Observe legal speed limits when driving the vehicle and perform the procedure in a location where safety can be assured.
•  Switch the ignition ON (engine off).
•  Display the PID related to the i-stop (engine-stop control) permit conditions using the M-MDS.
•  Drive the vehicle.
•  Verify if the i-stop (engine-stop control) permit conditions of the items which can be verified by the PID are met.
•  Are the permit conditions of all the items met?
Yes
Go to the next step.
No
Inspect the applicable items for Inspection item(s).
3
VERIFY VEHICLE CONDITION RELATED TO i-stop (ENGINE-STOP CONTROL) PERMIT CONDITION
•  Verify if all the following vehicle conditions are met.
?  Engine starts by operating push button with key left in vehicle
?  Brake pedal not depressed suddenly
?  Gear position: Not in 2nd gear fixed mode
•  Are all the conditions met?
Yes
Go to the next step.
No
Verify the i-stop (engine-stop control) permit condition, then go to Step 11.
4
PERFORM BATTERY CONDITION INITIAL SETTING (i-stop SETTING)
•  Perform the battery condition initial setting (i-stop setting).
•  Drive the vehicle to verify the i-stop operation condition.
•  Is engine-stopping by i-stop operable?
Yes
Go to Step 11.
No
Go to the next step.
5
INSPECT AMBIENT TEMPERATURE SENSOR FOR MALFUNCTION
•  Inspect the ambient temperature sensor.
•  Is the ambient temperature sensor normal?
Yes
Go to the next step.
No
Replace the ambient temperature sensor, then go to Step 11.
(See AMBIENT TEMPERATURE SENSOR REMOVAL/INSTALLATION.)
6
INSPECT EVAPORATOR TEMPERATURE SENSOR FOR MALFUNCTION
•  Inspect the evaporator temperature sensor.
•  Is the evaporator temperature sensor normal?
Yes
Go to the next step.
No
Replace the evaporator temperature sensor, then go to Step 11.
(See EVAPORATOR TEMPERATURE SENSOR REMOVAL/INSTALLATION.)
7
INSPECT CABIN TEMPERATURE SENSOR FOR MALFUNCTION
•  Inspect the cabin temperature sensor.
•  Is the cabin temperature sensor normal?
Yes
Go to the next step.
No
Replace the cabin temperature sensor, then go to Step 11.
(See CABIN TEMPERATURE SENSOR REMOVAL/INSTALLATION.)
8
DETERMINE IF MALFUNCTION CAUSED BY AIR MIX ACTUATOR MALFUNCTION
•  Inspect the air mix actuator.
•  Is the air mix actuator normal?
Yes
Inspect the air mix door and linkage for sticking.
(See FRONT A/C UNIT DISASSEMBLY/ASSEMBLY.)
(See REAR A/C UNIT DISASSEMBLY/ASSEMBLY.)
•  If there is no malfunction:
?  Go to the next step.
•  If there is any malfunction:
?  Repair or replace the malfunctioning location, then go to Step 11.
No
Replace the air mix actuator, then go to Step 11.
(See FRONT AIR MIX ACTUATOR REMOVAL/INSTALLATION.)
(See REAR AIR MIX ACTUATOR REMOVAL/INSTALLATION.)
9
DETERMINE IF MALFUNCTION CAUSED BY AIRFLOW MODE ACTUATOR MALFUNCTION
•  Inspect the airflow mode actuator.
•  Is the airflow mode actuator normal?
Yes
Go to the next step.
No
Replace the airflow mode actuator, then go to Step 11.
(See FRONT AIR MIX ACTUATOR REMOVAL/INSTALLATION.)
(See REAR AIR MIX ACTUATOR REMOVAL/INSTALLATION.)
10
INSPECT EPS CONTROL MODULE FOR MALFUNCTION
•  Inspect the EPS control module.
•  Is the EPS control module normal?
Yes
Perform the following procedures, then go to the next step.
1.  Switch the ignition off, and after 2 min or more have elapsed, switch the ignition ON.
2.  Start the engine and drive the vehicle on a straight road for 10 m {33 ft} or more at a speed of 10 km/h {6.2 mph} or more.
3.  Stop the vehicle with the wheels in the straight-ahead position.
No
Replace the EPS control module, then go to the next step.
(See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION.)
11
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Has the malfunction symptom been eliminated?
Yes
Complete the symptom troubleshooting. (Explain contents of repair to customer)
No
Repeat the inspection from Step 1.