NO.6 ENGINE DOES NOT RESTART [SKYACTIV-G 2.5T]

id1103b2001100

6

ENGINE DOES NOT RESTART
DESCRIPTION
•  The engine does not restart after the engine was stopped by the i-stop control.
POSSIBLE CAUSE
•  Engine does not crank when engine restart is initiated
?  Engine starting system malfunction
•  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 restart control) condition

Detection module

Detection item

Determination conditions

PID

Inspection item(s)
PCM
Vehicle speed
1 km/h {0.6 mph} or more
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 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) operation*1
TR
•  Transaxle range sensor
BPA
•  Brake switch
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
TR
•  Transaxle range sensor
BRK_F_P_C
•  Brake fluid pressure sensor
Accelerator pedal
Accelerator pedal is depressed while in D or M position
TR
•  Transaxle range sensor
APP
•  APP sensor
Steering torque
4.0 N·m {41 kgf·cm, 35 in·lbf} or more while in D or M position
STR_TRQ_S_M
•  EPS control module
PCM
Steering angle
70 ° or more from center while in D or M position
(After EPS control module learns center value)
Not applicable
Not applicable
Shift operation
Operated from P or N position to D, M, or R position
TR
•  Transaxle range sensor
i-stop OFF switch
ON
I-Stop_OFF
•  i-stop OFF switch
DC-DC converter (i-ELOOP) output current (with i-ELOOP)
30 A or more
DCDC_OUT_A
•  DC-DC converter (i-ELOOP)
Battery charge condition
65 % or less
BATT_SOC
•  Current sensor
•  Battery
Power brake unit vacuum
?47.8 kPa {?0.487 kgf/cm2, ?6.93 psi} or more
(value calculated by subtracting BARO from BBP)
BBP
•  Power brake unit vacuum sensor
BARO
•  BARO sensor
Driver not seated
•  Any one of the following conditions is met:
?  Seat belt (driver's side): Not fastened
?  Door (driver's side): Open
?  Bonnet: Open
SEAT_B_D
•  Driver-side buckle switch
DOOR_D
•  Front door latch switch (LH)
TR
•  Transaxle range sensor
HOOD
•  Bonnet latch switch
Engine stop period by i-stop
120 s or more
Not applicable
Not applicable
Engine coolant temperature
55 °C {131 °F} or less
ECT
•  ECT sensor
System condition
An i-stop related part DTC is recorded
Not applicable
Not applicable
Start stop unit
B+ (ROOM fuse) input
No
VPWR_B1
•  Start stop unit
•  Battery
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
Not applicable
Not applicable
System condition
An i-stop related part DTC is recorded
Not applicable
Not applicable
TCM
Gear position
Not in 2nd gear fixed mode
Not applicable
Not applicable
TFT
20 °C {68 °F} or less, or 117 °C {243 °F} or more
TFT
•  TFT sensor
Vehicle speed
3 km/h {2 mph} or more
WSPD_SEN_LF
•  Front ABS wheel-speed sensor
WSPD_SEN_RF
WSPD_SEN_LR
•  Rear ABS wheel-speed sensor
WSPD_SEN_RR
System condition
An i-stop related part DTC is recorded
Not applicable
Not applicable
Climate control unit
Cabin temperature (with full-auto air conditioner system)
Difference between target cabin temperature and actual cabin temperature is a certain value or more
(Cabin temperature control by A/C is normally performed)
STOP_ST
•  Climate control unit
A/C set temperature (with full-auto air conditioner system)
•  If any one of the following conditions is met:
?  A/C switch: Turned ON and MAX COLD setting
?  MAX HOT setting
Not applicable
Not applicable
Ambient temperature
-10 °C {14 °F} or less, or 50 °C {122 °F} or more
Not applicable
Not applicable
MODE switch
DEFROSTER
Not applicable
Not applicable
Airflow volume control dial (with full-auto air conditioner system)
MAX setting
DEF_SW
•  Climate control unit
System condition
An i-stop related part DTC is recorded
Not applicable
Not applicable
DSC HU/CM
System condition
An i-stop related part DTC is recorded
Not applicable
Not applicable
*1  :During Mazda Radar Cruise Control with Stop & Go function (MRCC with Stop & Go function) operation, the engine is not restarted by i-stop control even if the brake pedal is released.

Diagnostic Procedure

STEP

INSPECTION

RESULTS

ACTION
1
VERIFY ENGINE CRANKING OCCURRENCE
•  Start the engine.
•  Does the engine start?
Yes
Go to the next step.
No
Perform the symptom troubleshooting “NO.3 WILL NOT CRANK” and “NO.6 CRANKS NORMALLY BUT WILL NOT START”.
(See NO.3 WILL NOT CRANK [SKYACTIV-G 2.5T].)
(See NO.6 CRANKS NORMALLY BUT WILL NOT START [SKYACTIV-G 2.5T].)
2
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.
3
VERIFY i-stop (ENGINE RESTART CONTROL) PERMISSION CONDITION ITEM
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 items related to i-stop using the M-MDS.
•  Drive the vehicle and perform engine stopping by i-stop.
•  Verify if the i-stop (engine restart 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
For the applicable items, inspect the parts under Inspection Item(s).
4
VERIFY VEHICLE CONDITIONS RELATED TO i-stop (ENGINE RESTART CONTROL) PERMISSION CONDITIONS
•  Drive the vehicle and perform engine stopping by i-stop.
•  Verify that the engine restarts when any of the following conditions is met:
?  Gear position: Except 1st
?  A/C set temperature: MAX or MIN
?  DEFROSTER switch: ON
•  Does the engine restart?
Yes
Verify the i-stop (engine restart control) permission conditions, then 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 BAD AIR MIX ACTUATOR
•  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 BAD AIRFLOW MODE ACTUATOR
•  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 FRONT AIRFLOW MODE ACTUATOR 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 the test results.
•  If normal, return to the diagnostic index to service any additional symptoms.
•  If a malfunction remains, inspect the related Service Information and perform the repair or diagnosis.
?  If the vehicle is repaired, troubleshooting is completed.
?  If the vehicle is not repaired or additional diagnostic information is not available, replace the PCM.