Toyota Yaris: Stop And Start System / After Engine Stops due to Stop and Start System, Engine does not Restart

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Engine & Hybrid System / Stop And Start / Stop And Start System / After Engine Stops due to Stop and Start System, Engine does not Restart

DESCRIPTION

  • This is the troubleshooting procedure for situations where the engine does not restart after having been stopped by the stop and start system.
  • For information on stop and start control, refer to the system description.

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CAUTION / NOTICE / HINT

PRECAUTIONS WHEN THE ENGINE STOP AND START ECU AND THE STARTER ASSEMBLY ARE REPLACED

NOTICE:

  • When the engine stop and start ECU is replaced, it is necessary to read the number of starter operations before replacement and store this number in the new engine stop and start ECU after replacement, and to perform external backup boost converter (eco run vehicle converter assembly) existence learning. Moreover, initialization/learning of the air conditioning information and initialization/learning of the deceleration sensor zero point are also required.

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  • When the engine stop and start ECU or electromagnetic oil pump (oil pump assembly w/ solenoid) has been replaced, it is necessary to check the operation of the electromagnetic oil pump (oil pump assembly w/ solenoid).

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  • When the starter assembly is replaced, the number of starter operations stored in the engine stop and start ECU must be reset.

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  • When the starter assembly is replaced, "ST NO. 1 relay" must be also replaced.

PRECAUTIONS WHEN BATTERY IS DISCHARGED AFTER LEAVING VEHICLE FOR A LONG TIME

HINT:

If the vehicle has not been used for a long time, the battery charge may be low and stop and start control operation may be prohibited. After recharging the battery until the charging current decreases to 5 A or below, if the integrated current value still does not increase to the threshold value*1 or above, initialize the integrated current value*2 and drive the vehicle approximately 5 to 40 minutes until stop and start control operates.

  • *1: For information about the integrated current threshold value, refer to the system description.

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  • *2: Use the GTS to perform Integrated Current Value Initialization.

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PRECAUTIONS WHEN CONNECTING/DISCONNECTING CABLE TO/FROM NEGATIVE BATTERY TERMINAL

HINT:

  • If the cable is disconnected from the battery terminal, stop and start control is prohibited until refresh charge is completed. In this case, let the vehicle idle to complete the refresh charge. The refresh charge is complete when the Data List item Status of Battery Charge Control changes from "Refresh Charge Mode". (Usually, idling the engine for 5 to 60 minutes with the battery fluid temperature at 11°C (52°F) or higher, the refresh charge will be completed.)
  • If the GTS is not available and the Data List item Status of Battery Charge Control cannot be checked, charge the battery by idling the engine for approximately 5 to 60 minutes or driving the vehicle, and then drive the vehicle and check that stop and start control operates. If the engine is started with the hood open, the system determines that a jump start has occurred. Therefore, make sure that the hood is closed before starting the engine and driving the vehicle.
  • After the refresh charge completes, turn the ignition switch off, wait for at least 30 seconds, and then start the engine again. If the vehicle enters refresh charge mode again while the engine is idling, the initial refresh charge did not properly complete, so wait for the refresh charge to complete.
    1. If power is not supplied to the navigation system or audio and visual system when the ignition switch is turned to ON for the first time after the battery has been reconnected, DTC P323A19 will be stored. Perform either of the following operations:
      1. Turn the ignition switch from ON to off twice.
      2. After turning the ignition switch from ON to off, clear the DTCs.

IF THE ENGINE FAILS TO RESTART FROM IDLING STOP

NOTICE:

If the engine fails to restart when stopped by stop and start control, the brake actuator may be activated. Brake actuator activation conditions:
  • When the engine fails to restart when stopped by stop and start control.
  • When the brake booster vacuum is insufficient.
  • When the vehicle speed is 3 km/h (2 mph) or more and the brake pedal is depressed*.
    • *: When the engine is not running.

HINT:

  • When the engine fails to restart when stopped by stop and start control and the brake booster vacuum is insufficient, the brake actuator is activated to ensure the braking force. When the brake actuator is activated, sound and vibration may be generated. This is not due to malfunction of the stop and start system or the vehicle.

PRECAUTIONS FOR FOUR-WHEEL TOWING

Do not tow the vehicle with all 4 wheels on the ground.

NOTICE:

  • Towing the vehicle with all 4 wheels on the ground may have a detrimental effect on the stop and start system, and could lead to damage.

HINT:

If it is absolutely necessary to tow the vehicle with all 4 wheels on the ground, before towing first turn the ignition switch off. Then, turn the ignition switch to ON without starting the engine, and tow the vehicle.

PRECAUTIONS WHEN REPLACING ECM

NOTICE:

When the ECM is replaced on a vehicle with a non-specified battery, it is necessary to perform battery type switching.

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PROCEDURE

1.

CHECK VEHICLE CONTROL HISTORY (Engine Stall History during Stop&Start (Hood Open))
Powertrain > Stop and Start > Utility

Tester Display

Vehicle Control History (RoB)

(a) Check vehicle control history.

HINT:

  • Checking the freeze frame data allows the vehicle conditions at the time of detection to be confirmed.
  • As Vehicle Control History may be overwritten whenever the trigger conditions are met, make sure to save the Vehicle Control History data before performing any inspections.

Result

Proceed to

Vehicle control history item "Engine Stall History during Stop&Start (Hood Open)" stored

A

Vehicle control history item "Engine Stall History during Stop&Start (Hood Open)" not stored

B
B

GO TO STEP 3

A

2.

CHECK VEHICLE CONDITION (ENGINE HOOD CONDITION)

(a) Check the condition of the engine hood.

Check with the driver to confirm whether or not the engine hood was opened during stop and start control.

Result

Proceed to

Engine hood was not opened during stop and start control

A

Engine hood was opened during stop and start control

B
A

GO TO ENGINE HOOD COURTESY SWITCH CIRCUIT

B

ENGINE STALL DUE TO ENGINE HOOD BEING OPENED DURING STOP AND START CONTROL EXPLAIN THAT ENGINE RESTART BECOMES PROHIBITED

3.

CHECK VEHICLE CONTROL HISTORY (ENGINE STALL HISTORY DURING STOP&START (COLLISION OR BATTERY VOLTAGE LOW))
Powertrain > Stop and Start > Utility

Tester Display

Vehicle Control History (RoB)

(a) Check vehicle control history.

HINT:

  • Checking the freeze frame data allows the vehicle conditions at the time of detection to be confirmed.
  • As Vehicle Control History may be overwritten whenever the trigger conditions are met, make sure to save the Vehicle Control History data before performing any inspections.

Result

Proceed to

Vehicle control history item "Engine Stall History during Stop&Start (Collision or Battery Voltage Low)" stored

A

Vehicle control history item "Engine Stall History during Stop&Start (Collision or Battery Voltage Low)" not stored

B
A

ENGINE STALL DUE TO POWER SOURCE MOMENTARY INTERRUPTION
B

4.

CHECK VEHICLE CONDITION (DRIVER OPERATION ITEMS)
Powertrain > Stop and Start > Utility

Tester Display

Vehicle Control History (RoB)

(a) Select the vehicle control history item "Engine Start Fail" to display the data from the time of control.

(b) Check the output data, and check whether operations were performed that could result in an MT engine stall.

Result

Proceed to

When failure to restart from Stop and Start occurred, check whether the vehicle was put into "Shift Position" and "Clutch Lower Switch" was released (= incorrect operation). Or, for all recorded points, "Neutral Switch" is "OFF" (= driving range)

A

None of the above conditions are met

B
A

ENGINE STALL DUE TO INCORRECT CLUTCH OPERATION
B

5.

CHECK DTC OUTPUT

(a) Following the instructions on the GTS screen, check for SFI system DTCs.

Result

Proceed to

"SFI system poor startability DTCs/RoBs not output", but "SFI system poor startability related/connected DTCs/RoBs are output".

HINT:

  • "Engine stall" DTCs, misfires, poor fuel pressure, crank angle sensor, etc.
  • If SFI system poor startability DTCs/RoBs are output, first check that there was not a failure to restart from Stop and Start in "9. READ VEHICLE CONTROL HISTORY AND CHECK DTCS", and then check "EFI system poor startability DTCs /RoBs".

A

None of the above conditions are met
  • After engine stall, starter does not rotate.
  • Even after vehicle brought in, starter does not rotate.

B
  • When restarting engine from idling stop, starter did not rotate.
  • Even after vehicle brought in, when restarting engine from idling stop, starter does not rotate.

C
  • When restarting engine from idling stop, starter rotated.
  • Unknown whether starter rotated (does not remember).

D
A

GO TO SFI SYSTEM (RoB CHART)

B

GO TO THEFT DETERRENT/SMART ENTRY (START FUNCTION) (ENGINE DOES NOT START)

C

INSPECT STARTER SYSTEM
D

6.

STOP AND START SYSTEM OPERATION CHECK

(a) Perform an operation check of the stop and start system to confirm what kind of operations result in the engine failing to restart after it has been stopped by the stop and start system.

Click here

Result

Proceed to

While vehicle is stopped with the engine stopped by idling stop, the engine cannot restart when attempting to drive forward.

A

During idling stop, an operation that should restart the engine (brake off, shift operation, etc.) is performed, but there is no response to the start request (refer to Data List).

B
B

IDENTIFY START REQUEST LOCATION
A

7.

CHECK VEHICLE (FAILURE TO RESTART FROM STOP AND START)
Powertrain > Stop and Start > Utility

Tester Display

Vehicle Control History (RoB)

(a) Check the vehicle control history.

HINT:

  • Checking the freeze frame data allows the vehicle conditions at the time of detection to be confirmed.
  • As Vehicle Control History may be overwritten whenever the trigger conditions are met, make sure to save the Vehicle Control History data before performing any inspections.

Result

Proceed to

"Failure To Restart From Stop And Start" exists in Vehicle Control History

A

"Failure To Restart From Stop And Start" does not exist in Vehicle Control History

B
A

GO TO SFI SYSTEM (RoB CHART)

B

8.

CHECK VEHICLE CONTROL HISTORY AND PROBLEM SYMPTOMS
Powertrain > Stop and Start > Utility

Tester Display

Vehicle Control History (RoB)

(a) Select the vehicle control history item "Failure to Restart from Stop and Start" to display the data from the time of control.

(b) Check the output data.

Result

Proceed to

All recorded sections "Starter Status"*1 = OFF, and all recorded sections "Engine Speed" = 0 rpm

HINT:

It is possible that the starter drive command is not being sent from the engine stop and start ECU.

A

"Starter Status"*1 = ON for any sections, and all recorded sections "Engine Speed" = 0 rpm

HINT:

It is possible that the drive command is being sent from the engine stop and start ECU but the starter itself is not moving.

B

"Engine Speed" > 0 rpm for any sections

HINT:

It is possible that cranking was achieved but the engine stopped.

C
  • *1: Starter Motor Status in the case of tandem starter.
A

REPLACE ENGINE STOP AND START ECU

C

GO TO STEP 13

B

9.

CHECK VEHICLE CONTROL HISTORY AND PROBLEM SYMPTOMS
Powertrain > Stop and Start > Utility

Tester Display

Vehicle Control History (RoB)

(a) Check the vehicle control history item "Engine Starting Time".

Result

Proceed to

"Cranking Time" is 1.5 seconds or more

HINT:

It is possible that there is an external malfunction outside of the stop and start ECU (drive circuit).

A

"Cranking Time" is less than 1.5 seconds

HINT:

It is possible that there is a malfunction in the stop and start ECU (drive circuit).

B
B

REPLACE ENGINE STOP AND START ECU

A

10.

CHECK ENGINE STOP AND START ECU (+B VOLTAGE)

(a) Disconnect the A67 engine stop and start ECU connector.

(b) Turn the ignition switch to ON.

(c) Turn off any electrical loads.

(d) Measure the resistance according to the value(s) in the table below.

OK:

11 V or higher

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A67-1 (+B) - Body ground

Ignition switch ON

11 V or higher
NG

GO TO STEP 12

OK

11.

CHECK VEHICLE CONTROL HISTORY (BATTERY VOLTAGE)
Powertrain > Stop and Start > Utility

Tester Display

Vehicle Control History (RoB)

(a) Check the voltage of the auxiliary battery.

HINT:

  • Depending on RoB detection timing, the minimum voltage from the previous startup will be stored for the Minimum Voltage (Cranking) and the Minimum Voltage (Starter Solenoid Engagement). For the battery condition at the start of the current driving cycle, see Battery Voltage.
  • When the value is 20, the value is being calculated.

Result

Proceed to

Auxiliary battery voltage is 8.92 V or more

A

Auxiliary battery voltage is less than 8.92 V

B
A

INSPECT STARTER SYSTEM

B

GO TO STEP 12

12.

INSPECT AUXILIARY BATTERY

(a) Measure the voltage of the auxiliary battery.

Standard Voltage:

11 to 14 V

OK

INSPECT STARTER SYSTEM

NG

REPLACE AUXILIARY BATTERY

13.

CHECK VEHICLE CONTROL HISTORY (CRANKING TIME AND STARTER OFF PERMISSION HISTORY (ECM))
Powertrain > Stop and Start > Utility

Tester Display

Vehicle Control History (RoB)

(a) Select a vehicle control history item to display the "Cranking Time" and "Starter OFF Permission History (ECM)" data from the time of control.

(b) Check the output data.

Result

Proceed to

"Cranking Time" is less than 1.5 seconds

"Starter OFF Permission History (ECM)" is ON

HINT:

It is possible that the ECM made a judgment of complete combustion and the ECM then stopped the starter.

A

"Starter OFF Permission History (ECM)" is OFF

HINT:

It is possible that the engine stop and start ECU made a judgment of complete combustion and the engine stop and start ECU then stopped the starter.

B

"Cranking Time" is 1.5 seconds or more

HINT:

It is possible that the stop and start ECU did not stop the starter.

-

C
A

SFI SYSTEM (Poor Startability)

C

GO TO STEP 17

B

14.

READ VALUE USING GTS (Engine Speed)
Powertrain > Stop and Start > Data List

Tester Display

Engine Speed

(a) Using the Data List, check the current engine speed value of the stop and start ECU.

OK:

Stop and Start ECU "Engine Speed" > "Engine Speed (ENG)" + 300 rpm

NG

GO TO STEP 16

OK

15.

CHECK DATA POINTS (Engine Speed)

(a) Check the RoB data points.

OK:

For each and all of the data points, "Engine Speed" > "Engine Speed (ECM)" + 300 rpm

OK

READ VALUE USING GTS (Engine Speed)

NG

GO TO STEP 16

16.

CHECK ENGINE STOP AND START ECU (STA SIGNAL)

*a

Component with harness connected

(Engine Stop and Start ECU)

-

-
Powertrain > Stop and Start > Active Test

Tester Display

Starter Motor Drive Magnet Switch(Hood Close)

(a) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tandem Starter

Tester Connection

Condition

Specified Condition

A67-21 (STA) - A67-6 (DGND)

Performing Active Test, while cranking.

6 to 14 V

(b) Using an oscilloscope, measure the waveform immediately after starting.

Item

Content

Tester Connection

A67-21 (STA) ←→ A67-6 (DGND)

Tool Setting

10 V/DIV, 200 ms./DIV

Condition

During cranking

OK:

Voltage and waveform both normal
OK

INSPECT ENGINE (Pre-ignition, SFI System, Poor Startability)

NG

REPLACE ENGINE STOP AND START ECU

17.

CHECK DATA POINTS (Engine Speed)

(a) Check the RoB data points.

OK:

When "Starter Status"*1 is ON, there is even 1 point at which "Engine Speed" < 300 rpm

* "Starter Status" in the case of other than tandem starter, "Starter Motor Status" in the case of tandem starter.

OK

INSPECT STARTER SYSTEM

NG

18.

CHECK OPERATION

(a) Check how long it took the engine to stall after turning the starter off.

Result

Proceed to

After starter turned off, engine immediately stalls.

HINT:

Engine stalls within 2 seconds.

A

After starter turned off, engine stalls after a time.

B
A

SFI SYSTEM (Engine Difficult to Start)

B

SFI SYSTEM (Engine stalls)

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