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

id1103a3000900

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
PCM
Vehicle speed
0 km/h {0 mph}
WSPD_SEN_LF
WSPD_SEN_RF
WSPD_SEN_LR
WSPD_SEN_RR
Brake pedal
Brake pedal is depressed while in D or M position
TR
BPA
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)
TR
BRK_F_P_C
Accelerator pedal
Released
APP
Vehicle conditions
Vehicle is stopped in D position*1
TR
Steering speed
15 deg/s or less
STR_ROT_SPD
Steering angle
Within 65° of center to left and right
(After EPS control module learns center value)
Not applicable
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
Vehicle speed history
(After engine started and driven once)
3 km/h {2 mph} or more
I-Stop_VSP
Battery charge condition
65.72 % or more
BATT_SOC
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
BARO
Door (driver's side)
Closed
DOOR_D
Hood
Closed *2
HOOD
Vehicle inclination angle
Within ±7° when level (LON_ACCL_C: within ±0.121 G)
LON_ACCL_C
Seat belt (driver's side)
Fastened*3
SEAT_B_D
Battery condition setting
Completed
Not applicable
Steering angle sensor initial setting
Completed
Not applicable
Engine coolant temperature
35—110 °C {95—230 °F}
ECT
Intake air temperature
100 °C {212 °F} or less
IAT
Altitude
1,800 m or less (BARO: 81.5 kPa {0.831 kgf/cm2, 11.8 psi} or more)
BARO
System condition
i-stop related part DTCs are not recorded
Not applicable
Start stop unit
+B (ROOM fuse) input
Yes
VPWR_B1
IG1 input
Yes
VPWR_IG1
ACC input
Yes
VPWR_ACC
IG1 output
Yes
RELAY_IG1
IG2 output
Yes
RELAY_IG2
ACC output
Yes
RELAY_ACC
Push button
Not pressed
SSB_1
SSB_2
Door (all)
Closed
DOOR_ALL
Liftgate
Closed
TRUNK
Seat belt (driver's side)
Fastened*3
SEAT_B_D
Engine start
Engine was started by operating push button with key inside cabin (engine started first time)
Not applicable
Engine rotation speed
300 rpm or more is maintained after engine started
Not applicable
System condition
i-stop related part DTCs are not recorded
Not applicable
TCM
TCM detection condition
All met (I-Stop_EST: On)
I-Stop_EST
Panic stop
Brake pedal was not depressed suddenly within 4 s
Not applicable
TFT
20―117 °C {68—242 °F}
TFT
Gear position
Not in 2nd gear fixed mode
Not applicable
System condition
i-stop related part DTCs are not recorded
Not applicable
Climate control unit
Climate control unit determination condition
All met
(STOP_ST: Available)
STOP_ST
Cabin temperature (with full-auto A/C)
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
A/C temperature (with full-auto A/C)
Setting other than MAX/MIN
Not applicable
Ambient temperature
-10―50 °C {14—122 °F}
Not applicable
Cold condition
Ambient temperature is 4 °C {39 °F} or more or evaporator temperature is 12 °C {54 °F} or less
Not applicable
Front defroster switch
OFF
Not applicable
System condition
i-stop related part DTCs are not recorded
Not applicable
DSC HU/CM
Operation request from PCM
Hill Launch Assist (HLA) control request signal from PCM is received
Not applicable
Vehicle inclination angle
Inclination is within ±6° with shift positioned in D/M/R or N/P (LON_ACCL_C: within ±0.104 G)
TR
LON_ACCL_C
Wheel speed (4 wheels)
0 km/h {0 mph}
WSPD_SEN_LF
WSPD_SEN_RF
WSPD_SEN_LR
WSPD_SEN_RR
Brake pedal
Brake pedal is depressed
BRAKE_SW
Brake fluid pressure
Approx. 0.45 MPa {4.6 kgf/cm2, 65 psi} or more
BRK_F_P_C
Accelerator pedal
Released
APP
System condition
i-stop related part DTCs are not recorded
Not applicable

*1  :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.
*2  :If the engine is started with the hood open, i-stop is inhibited until the engine is stopped.
*3  :If the seat belt is unfastened while the vehicle is stopped, i-stop is inhibited until a vehicle speed record is input once.

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 2.5)])
(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [TCM (FW6A-EL, FW6AX-EL)])
(See DTC TABLE [DYNAMIC STABILITY CONTROL (DSC)])
(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.)
(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
Vehicles with full-auto air conditioner system:
•  Go to the next step.
Vehicles with manual air conditioner system:
•  Go to Step 10.
No
Replace the evaporator temperature sensor, then go to Step 11.
(See EVAPORATOR TEMPERATURE SENSOR REMOVAL/INSTALLATION.)
(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 AIRFLOW MODE ACTUATOR REMOVAL.)
(See REAR AIRFLOW MODE ACTUATOR REMOVAL/INSTALLATION.)
10
INSPECT EPS CONTROL MODULE FOR MALFUNCTION
•  Inspect the EPS control module.
•  Is the EPS control module normal?
Yes
Implement the following procedure, 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.