i-stop FUNCTION DOES NOT OPERATE [SKYACTIV-G]

Troubleshooting item	i-stop function does not operate
Description	• i-stop function does not operate when vehicle is stopped.
Possible cause	• DTCs are stored in the following modules. ― PCM ― DC-DC converter (Mazda M Hybrid) ― Mazda M Hybrid battery ― Integrated starter generator (ISG) ― Electronically controlled brake unit ― SAS control module ― TCM ― EPS control module ― Body control module (BCM) • 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. ― ACC_LON_C ― BRK_FLD_PRES ― BRK_PEDAL_SW ― WSPD_SEN_L/F ― WSPD_SEN_L/R ― WSPD_SEN_R/F ― WSPD_SEN_R/R
System wiring diagram	• Not applicable
Connector diagram	• Not applicable

Troubleshooting item

i-stop function does not operate

Description

• i-stop function does not operate when vehicle is stopped.

Possible cause

• DTCs are stored in the following modules.

― PCM

― DC-DC converter (Mazda M Hybrid)

― Mazda M Hybrid battery

― Integrated starter generator (ISG)

― Electronically controlled brake unit

― SAS control module

― TCM

― EPS control module

― Body control module (BCM)

• 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.

― ACC_LON_C

― BRK_FLD_PRES

― BRK_PEDAL_SW

― WSPD_SEN_L/F

― WSPD_SEN_L/R

― WSPD_SEN_R/F

― WSPD_SEN_R/R

System wiring diagram

• Not applicable

Connector diagram

• Not applicable

Step	Inspection	Results	Action
1	VERIFY DTC • Perform the DTC inspection for the following modules. (See DTC INSPECTION.) ― PCM ― DC-DC converter (Mazda M Hybrid) ― Mazda M Hybrid battery ― Integrated starter generator (ISG) ― 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)].) (See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [TCM (ET6A-EL, ET6AX-EL)].) (See DTC TABLE [DASH-ELECTRICAL SUPPLY UNIT].) (See DTC TABLE [BODY CONTROL MODULE (BCM)].) (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 [ELECTRONICALLY CONTROLLED BRAKE UNIT].) (See DTC TABLE [SAS CONTROL MODULE (TWO-STEP DEPLOYMENT CONTROL SYSTEM)].) (See DTC TABLE [ELECTRIC POWER STEERING (EPS) CONTROL MODULE].)
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. (See PID/DATA MONITOR INSPECTION.) (See PID/DATA MONITOR TABLE [SKYACTIV-G].) • 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	Repair or replace the malfunctioning location and perform the repair completion verification.
3	VERIFY REMAINING LEVEL OF Mazda M Hybrid BATTERY • Access the Mazda M Hybrid battery PID [HV_EV_BATT_SOC] using the M-MDS. (See PID/DATA MONITOR INSPECTION.) (See PID/DATA MONITOR TABLE [SKYACTIV-G].) • Is the PID value less than 20%?	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.
No	Go to the next step.
4	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. (See PID/DATA MONITOR INSPECTION.) (See PID/DATA MONITOR TABLE [SKYACTIV-G].) • 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.
No	Go to the next step.
5	VERIFY DETERIORATION CONDITION OF INTERNAL RESISTANCE IN Mazda M Hybrid BATTERY • Access the Mazda M Hybrid battery PID [HV_EV_BATT_RES] using the M-MDS. (See PID/DATA MONITOR INSPECTION.) (See PID/DATA MONITOR TABLE [SKYACTIV-G].) • Is the PID value approx. 0%?	Yes	Deterioration of the Mazda M Hybrid battery can be considered. (Internal resistance increase) • Explain to the customer that it is difficult for the vehicle to operate the i-stop function due to deterioration of the Mazda M Hybrid battery. (Have customer determine if Mazda M Hybrid battery is to be replaced or not.) • Perform the repair completion verification.
No	Go to the next step.
6	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 and perform the repair completion verification. (See SYMPTOM DIAGNOSTIC INDEX [SKYACTIV-G].)
7	INSPECT AMBIENT TEMPERATURE SENSOR FOR MALFUNCTION • Inspect the applicable part. (See AMBIENT TEMPERATURE SENSOR INSPECTION.) • Is the part normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification. (See AMBIENT TEMPERATURE SENSOR REMOVAL/INSTALLATION.)
8	INSPECT EVAPORATOR TEMPERATURE SENSOR FOR MALFUNCTION • Inspect the applicable part. (See EVAPORATOR TEMPERATURE SENSOR INSPECTION.) • Is the part normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification. (See EVAPORATOR TEMPERATURE SENSOR REMOVAL/INSTALLATION.)
9	INSPECT PASSENGER COMPARTMENT TEMPERATURE SENSOR FOR MALFUNCTION • Inspect the applicable part. (See PASSENGER COMPARTMENT TEMPERATURE SENSOR INSPECTION.) • Is the part normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification. (See PASSENGER COMPARTMENT TEMPERATURE SENSOR REMOVAL/INSTALLATION.)
10	DETERMINE IF MALFUNCTION CAUSED BY AIR MIX ACTUATOR MALFUNCTION • Inspect the applicable part. (See AIR MIX ACTUATOR INSPECTION.) • Is the part normal?	Yes	Inspect the air mix door and linkage for sticking. (See 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 and perform the repair completion verification.
No	Repair or replace the malfunctioning location and perform the repair completion verification. (See AIR MIX ACTUATOR REMOVAL.) (See AIR MIX ACTUATOR INSTALLATION.)
11	INSPECT AIRFLOW MODE ACTUATOR FOR MALFUNCTION • Inspect the applicable part. (See AIRFLOW MODE ACTUATOR INSPECTION.) • Is the part normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning location and perform the repair completion verification. (See AIRFLOW MODE ACTUATOR REMOVAL.) (See AIRFLOW MODE ACTUATOR INSTALLATION.)
12	INSPECT EPS CONTROL MODULE FOR MALFUNCTION • Inspect the applicable part. (See EPS CONTROL MODULE INSPECTION.) • Is the part 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 {32 ft 10 in} 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	Repair or replace the malfunctioning location and perform the repair completion verification. (See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION.)
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.) • 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. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
No	Replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

Step

Inspection

Results

Action

VERIFY DTC

• Perform the DTC inspection for the following modules.

(See DTC INSPECTION.)

― PCM

― DC-DC converter (Mazda M Hybrid)

― Mazda M Hybrid battery

― Integrated starter generator (ISG)

― 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)].)

(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [TCM (ET6A-EL, ET6AX-EL)].)

(See DTC TABLE [DASH-ELECTRICAL SUPPLY UNIT].)

(See DTC TABLE [BODY CONTROL MODULE (BCM)].)

(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 [ELECTRONICALLY CONTROLLED BRAKE UNIT].)

(See DTC TABLE [SAS CONTROL MODULE (TWO-STEP DEPLOYMENT CONTROL SYSTEM)].)

(See DTC TABLE [ELECTRIC POWER STEERING (EPS) CONTROL MODULE].)

Go to the next step.

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.

(See PID/DATA MONITOR INSPECTION.)

(See PID/DATA MONITOR TABLE [SKYACTIV-G].)

• 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.

Repair or replace the malfunctioning location and perform the repair completion verification.

VERIFY REMAINING LEVEL OF Mazda M Hybrid BATTERY

• Access the Mazda M Hybrid battery PID [HV_EV_BATT_SOC] using the M-MDS.

(See PID/DATA MONITOR INSPECTION.)

(See PID/DATA MONITOR TABLE [SKYACTIV-G].)

• Is the PID value less than 20%?

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.

Go to the next step.

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.

(See PID/DATA MONITOR INSPECTION.)

(See PID/DATA MONITOR TABLE [SKYACTIV-G].)

• 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.

Go to the next step.

VERIFY DETERIORATION CONDITION OF INTERNAL RESISTANCE IN Mazda M Hybrid BATTERY

• Access the Mazda M Hybrid battery PID [HV_EV_BATT_RES] using the M-MDS.

(See PID/DATA MONITOR INSPECTION.)

(See PID/DATA MONITOR TABLE [SKYACTIV-G].)

• Is the PID value approx. 0%?

Yes

Deterioration of the Mazda M Hybrid battery can be considered. (Internal resistance increase)

• Explain to the customer that it is difficult for the vehicle to operate the i-stop function due to deterioration of the Mazda M Hybrid battery. (Have customer determine if Mazda M Hybrid battery is to be replaced or not.)

• Perform the repair completion verification.

Go to the next step.

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.

Verify the i-stop (engine-stop control) permit condition and perform the repair completion verification.

(See SYMPTOM DIAGNOSTIC INDEX [SKYACTIV-G].)

INSPECT AMBIENT TEMPERATURE SENSOR FOR MALFUNCTION

• Inspect the applicable part.

(See AMBIENT TEMPERATURE SENSOR INSPECTION.)

• Is the part normal?

Yes

Go to the next step.

Repair or replace the malfunctioning location and perform the repair completion verification.

(See AMBIENT TEMPERATURE SENSOR REMOVAL/INSTALLATION.)

INSPECT EVAPORATOR TEMPERATURE SENSOR FOR MALFUNCTION

• Inspect the applicable part.

(See EVAPORATOR TEMPERATURE SENSOR INSPECTION.)

• Is the part normal?

Yes

Go to the next step.

Repair or replace the malfunctioning location and perform the repair completion verification.

(See EVAPORATOR TEMPERATURE SENSOR REMOVAL/INSTALLATION.)

INSPECT PASSENGER COMPARTMENT TEMPERATURE SENSOR FOR MALFUNCTION

• Inspect the applicable part.

(See PASSENGER COMPARTMENT TEMPERATURE SENSOR INSPECTION.)

• Is the part normal?

Yes

Go to the next step.

Repair or replace the malfunctioning location and perform the repair completion verification.

(See PASSENGER COMPARTMENT TEMPERATURE SENSOR REMOVAL/INSTALLATION.)

DETERMINE IF MALFUNCTION CAUSED BY AIR MIX ACTUATOR MALFUNCTION

• Inspect the applicable part.

(See AIR MIX ACTUATOR INSPECTION.)

• Is the part normal?

Yes

Inspect the air mix door and linkage for sticking.

(See 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 and perform the repair completion verification.

Repair or replace the malfunctioning location and perform the repair completion verification.

(See AIR MIX ACTUATOR REMOVAL.)

(See AIR MIX ACTUATOR INSTALLATION.)

INSPECT AIRFLOW MODE ACTUATOR FOR MALFUNCTION

• Inspect the applicable part.

(See AIRFLOW MODE ACTUATOR INSPECTION.)

• Is the part normal?

Yes

Go to the next step.

Repair or replace the malfunctioning location and perform the repair completion verification.

(See AIRFLOW MODE ACTUATOR REMOVAL.)

(See AIRFLOW MODE ACTUATOR INSTALLATION.)

INSPECT EPS CONTROL MODULE FOR MALFUNCTION

• Inspect the applicable part.

(See EPS CONTROL MODULE INSPECTION.)

• Is the part 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 {32 ft 10 in} 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.

Repair or replace the malfunctioning location and perform the repair completion verification.

(See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION.)

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)

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.)

• 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.

(See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

Replace the PCM.

(See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)