LIMITED i-stop FUNCTION OPERATION TIME [SKYACTIV-G (WITH Mazda M Hybrid)]

id1103sb0024se

Troubleshooting item

Limited i-stop function operation time
Description
•  Frequency of which i-stop function operates is low.
•  Frequent occurrence of engine restarting other than for driving vehicle from stop.
Possible cause
Note
•  To ensure electric vehicle system reliability, restart the engine regardless of the vehicle condition after 120 s have elapsed since the i-stop function operated.
•  DTCs are stored in the following modules.
―  PCM
―  DC-DC converter (Mazda M Hybrid)
―  Mazda M Hybrid battery
―  Integrated starter generator (ISG)
―  Dash-electrical supply unit
―  Electronically controlled brake unit
―  SAS control module
―  TCM
―  EPS control module
―  Body control module (BCM)
Battery voltage low during i-stop function operation
•  Insufficient battery recharge while engine is running
―  Low recharge effect
•  Integrated starter generator (ISG) malfunction (part, system, control malfunction)
•  Large amount of vehicle power consumption
•  High electrical load from aftermarket electrical accessories
•  Mazda M Hybrid battery malfunction (remaining capacity is low, duct of floor under cover No.1 (RH) is clogged, or Mazda M Hybrid battery is deteriorated)
False detection of engine starting conditions
•  False detection of battery voltage
False recognition of driver performing engine start operation
•  False detection of released brake pedal
―  Brake fluid pressure sensor (built-into electronically controlled brake unit) malfunction
•  False detection of steering wheel operation
―  Steering angle sensor initialization malfunction
―  EPS control module malfunction
―  Steering angle sensor malfunction
System wiring diagram
•  Not applicable
Connector diagram
•  Not applicable

Diagnostic procedure

Step

Inspection

Results

Action
1
VERIFY THAT THERE IS NO OPERATION PERFORMED TO RESTART ENGINE
•  While referring to the following items and the "i-stop (engine restart control) permit conditions table", confirm with the customer that there was no operation performed to restart the engine while the i-stop function was operating.
―  i-stop OFF switch operation
―  Accelerator pedal operation
―  Steering wheel operation
―  Brake pedal operation
―  Selector lever operation
―  Hood opened
―  Driver-side door opened
―  Seat belt unfastened
―  A/C output set to high
•  Is the customer's driving appropriate?
Yes
Go to the next step.
No
The system is normal.
•  Explain to the customer that the occurrence is due to the operation to restart the engine.
2
INSPECT EFFECT OF NON-GENUINE ELECTRICAL ACCESSORY FOR CAUSE OF MALFUNCTION
•  Remove any non-genuine electrical accessory.
•  Verify the malfunction symptom.
•  Is the frequency of the engine restarting from the i-stop off condition the same as that of another vehicle of the same model?
Yes
The system is normal.
•  Explain to the customer that the frequency of the engine restarting increases due to the effect of the non-genuine electrical accessory installed.
No
Go to the next step.
3
VERIFY DTC
•  Perform the DTC inspection for the following modules.
―  PCM
―  DC-DC converter (Mazda M Hybrid)
―  Mazda M Hybrid battery
―  Integrated starter generator (ISG)
―  Dash-electrical supply unit
―  Electronically controlled brake unit
―  SAS control module
―  TCM
―  EPS control module
―  Body control module (BCM)
•  Are any DTCs displayed?
Yes
Repair the malfunctioning location according to the applicable DTC troubleshooting.
(See DTC TABLE [PCM (SKYACTIV-G (E))].)
(See DTC TABLE [DC-DC CONVERTER (Mazda M Hybrid)].)
(See DTC TABLE [Mazda M Hybrid BATTERY].)
(See DTC TABLE [INTEGRATED STARTER GENERATOR (ISG)].)
(See DTC TABLE [DASH-ELECTRICAL SUPPLY UNIT (E)].)
(See DTC TABLE [ELECTRONICALLY CONTROLLED BRAKE UNIT].)
(See DTC TABLE [SAS CONTROL MODULE].)
(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [TCM (CW6A-EL)].)
(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [TCM (ET6A-EL, ET6AX-EL) (E)].)
(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [TCM (EV6A-EL) (E)].)
(See DTC TABLE [ELECTRIC POWER STEERING (EPS) (E)].)
(See DTC TABLE [BODY CONTROL MODULE (BCM) (E)].)
No
Go to the next step.
4
VERIFY REMAINING LEVEL OF Mazda M Hybrid BATTERY
•  Access the Mazda M Hybrid battery PID HV_EV_BATT_SOC using the M-MDS.
•  Is the PID value less than 25 %?
Yes
Start the engine and charge the Mazda M Hybrid battery until the PID HV_EV_BATT_SOC value reaches 20% or more.
Perform the repair completion verification 1.
No
Go to the next step.
5
VERIFY TEMPERATURE OF Mazda M Hybrid BATTERY
•  Access the Mazda M Hybrid battery PIDs BATT_TEMP_1 and BATT_TEMP_2 using the M-MDS.
•  Is the PID value 60 °C {140 °F} or more?
Yes
Visually inspect the Mazda M Hybrid battery.
(See Mazda M Hybrid BATTERY INSPECTION.)
If there is no malfunction:
•  Go to the next step.
If there is any malfunction:
•  Repair or replace the malfunctioning location and perform the repair completion verification 1.
No
Go to the next step.
6
DETERMINE IF MALFUNCTION CAUSE IS STEERING ANGLE SENSOR SIGNAL OR OTHER
•  Start the engine and let it idle.
•  Access the EPS control module PID STR_ANG using the M-MDS.
•  Is the PID value normal?
Yes
Go to Step 9.
No
Go to the next step.
7
INSPECT STEERING ANGLE SENSOR FOR MALFUNCTION
•  Inspect the applicable part.
•  Is the part normal?
Yes
Go to the next step.
No
Repair or replace the malfunctioning location and perform the repair completion verification 1.
(See CLOCK SPRING REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)
(See CLOCK SPRING REMOVAL/INSTALLATION [STANDARD DEPLOYMENT CONTROL SYSTEM].)
8
INSPECT EPS CONTROL MODULE FOR MALFUNCTION
•  Inspect the applicable part.
•  Is the part normal?
Yes
Perform the following procedure:
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 10 m {32 ft 10 in} or more in a straight line at a speed of 10 km/h {6.2 mph} or more.
3.  Stop the vehicle with the wheels in the straight-ahead position.
4.  Access the EPS control module PID STR_ANG using the M-MDS.
•  If the STR_ANG value is normal, perform the repair completion verification 1. (Because the steering angle (estimated absolute angle) has returned to normal)
•  If the STR_ANG value is not normal, replace the EPS control module, then perform the repair completion verification 1.
No
Repair or replace the malfunctioning location and perform the repair completion verification 1.
(See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION [(E)].)
9
DETERMINE IF MALFUNCTION CAUSE IS BRAKE FLUID PRESSURE SENSOR SIGNAL OR OTHER
•  Put the vehicle in an i-stop condition (engine stopped).
•  Monitor the electronically controlled brake unit PID BRK_FLD_PRES using the M-MDS while the brake is depressed and held with the i-stop function operating.
•  Does the monitoring value change?
Yes
Go to the next step.
No
Brake fluid pressure sensor malfunction.
•  Replace the electronically controlled brake unit, then perform the repair completion verification 1.
Repair completion verification 1
VERIFY THAT VEHICLE IS REPAIRED
•  Install/connect the part removed/disconnected during the troubleshooting procedure.
•  Has the malfunction symptom been eliminated?
Yes
Complete the symptom troubleshooting. (Explain contents of repair to customer)
No
Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].)
•  If the CAN communication is normal, perform the diagnosis from Step 1.
―  If the malfunction recurs, go to the next step.
Repair completion verification 2
VERIFY IF MALFUNCTION IS CAUSED BY NOT PERFORMING PCM REPROGRAMMING
•  Verify repair information and verify that there is a new calibration in the PCM.
•  Is there a new calibration in the PCM?
Yes
Perform the PCM reprogramming and verify if the malfunction symptom was corrected.
•  If the malfunction recurs, replace the PCM.
No
Replace the PCM.
(See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (E))].)
(See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].)