Failure to Restart from IG-ON Engine Stall [10/2022 - ]: Procedure

1. Enter the following menus: Powertrain / Stop and Start / Utility / Vehicle Control History (RoB).

   Powertrain > Stop and Start > Utility 

   Tester Display
   Vehicle Control History (RoB)

2. 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

   Result	Proceed to
   Vehicle control history [X0874: Stop & Start Restart Failure (Engine Restart after Engine Stall)] is output	A
   Vehicle control history [X0874: Stop & Start Restart Failure (Engine Restart after Engine Stall)] is not output	B

Result: 

B 

GO TO ENGINE CONTROL SYSTEM (ROB CHART) 

Diagnostic trouble code chart :

Refer to DIAGNOSTIC TROUBLE CODE CHART [10/2022 - 11/2023] , or refer to DIAGNOSTIC TROUBLE CODE CHART [11/2023 - ]

Vehicle control history (RoB):

Refer to VEHICLE CONTROL HISTORY (RoB) [10/2022 - 11/2023] , or refer to VEHICLE CONTROL HISTORY (RoB) [11/2023 - ]

Result: 

A 

See step  2

1. Consult with the customer to determine if they performed operations that could result in an AT engine stall.

   HINT: 

   (ex.) Heavy load, frequent shifts, etc.

   Result

   Result	Proceed to
   Driver operations that could cause engine stall were performed	A
   None of the above conditions are met	B

Result: 

A 

ENGINE STALL DUE TO DRIVER OPERATION 

Result: 

B 

See step  3

1. Enter the following menus: Powertrain / Stop and Start / Utility / Vehicle Control History (RoB).

   Powertrain > Stop and Start > Utility 

   Tester Display
   Vehicle Control History (RoB)

2. Select a vehicle control history item to display the data from the time of control.
3. Check the output data.

   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

   Result	Proceed to
   All recorded sections Starter Motor = 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 Motor = 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

Result: 

A 

REPLACE ENGINE STOP AND START ECU 

Refer to REMOVAL [10/2022 - 11/2023] , or refer to REMOVAL [11/2023 - ]

HINT: 

It is possible that there is a malfunction of the starter drive circuit inside the stop and start ECU.

Result: 

C 

See step  8

Result: 

B 

See step  4

1. Enter the following menus: Powertrain / Stop and Start / Utility / Vehicle Control History (RoB).

   Powertrain > Stop and Start > Utility 

   Tester Display
   Vehicle Control History (RoB)

2. Select a vehicle control history item to display the data from the time of control.
3. Check the output data.

   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

   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

Result: 

B 

REPLACE ENGINE STOP AND START ECU 

Refer to REMOVAL [10/2022 - 11/2023] , or refer to REMOVAL [11/2023 - ]

Result: 

A 

See step  5

1. Disconnect the engine stop and start ECU connector.
2. Turn the ignition switch to ON.
3. Turn off any electrical loads.
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   A34-1 (+B) - Body ground	Ignition switch ON	11 V or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  7

Result: 

OK 

See step  6

1. Enter the following menus: Powertrain / Stop and Start / Utility / Vehicle Control History (RoB).

   Powertrain > Stop and Start > Utility 

   Tester Display
   Vehicle Control History (RoB)

2. Select a vehicle control history item to display the data from the time of control.
3. Check the output data.

   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.
   • 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 V, the value is being calculated.

   Result

   Result	Proceed to
   Battery voltage is 8.92 V or more	A
   Battery voltage is less than 8.92 V	B

Result: 

A 

INSPECT STARTER SYSTEM 

Refer to Starter Signal Circuit [10/2022 - 11/2023] , or refer to Starter Signal Circuit [11/2023 - ]

Result: 

B 

See step  7

1. Measure the voltage of the battery.

   Standard voltage

   11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

INSPECT STARTER SYSTEM 

Refer to Starter Signal Circuit [10/2022 - 11/2023] , or refer to Starter Signal Circuit [11/2023 - ]

Result: 

NG 

REPLACE BATTERY 

1. Enter the following menus: Powertrain / Stop and Start / Utility / Vehicle Control History (RoB).

   Powertrain > Stop and Start > Utility 

   Tester Display
   Vehicle Control History (RoB)

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

   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

   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

Result: 

A 

ENGINE CONTROL SYSTEM (POOR STARTABILITY) 

Refer to Engine Difficult to Start [10/2022 - ]

HINT: 

Check whether the speed value of the EFI ECU is not a higher value than the original NE.

Result: 

C 

See step  12

Result: 

B 

See step  9

1. Enter the following menus: Powertrain / Stop and Start / Data List / Engine Speed and Engine Speed (ECM).

   Powertrain > Stop and Start > Data List 

   Tester Display
   Engine Speed
   Engine Speed (ECM)

2. Compare the Data List items displayed on the GTS.

   Result

   Result	Proceed to
   Engine Speed > Engine Speed (ECM) + 100 rpm	A
   None of the above conditions are met	B

Result: 

B 

See step  11

Result: 

A 

See step  10

1. Enter the following menus: Powertrain / Stop and Start / Utility / Vehicle Control History (RoB).

   Powertrain > Stop and Start > Utility 

   Tester Display
   Vehicle Control History (RoB)

2. Select a vehicle control history item to display the data from the time of control.
3. Check the data points in the data that was output.

   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

   Result	Proceed to
   For each and all of the data points, "Engine Speed" > "Engine Speed (ECM)" + 100 rpm	A
   None of the above conditions are met	B

Result: 

A 

READ VALUE USING GTS (ENGINE SPEED) 

Refer to DTC P0335-62: Crankshaft Position Sensor "A" Signal Compare Failure [10/2022 - 11/2023] , or refer to DTC P0335-62: Crankshaft Position Sensor "A" Signal Compare Failure [11/2023 - ]

Result: 

B 

See step  11

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Enter the following menus: Powertrain / Stop and Start / Active Test / Starter (Hood Close)

   Powertrain > Stop and Start > Active Test 

   Tester Display
   Starter (Hood Close)

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

   Refer to TERMINALS OF ECU [10/2022 - 11/2023] , or refer to TERMINALS OF ECU [11/2023 - ]

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A34-21 (STA) - A34-6 (DGND)	Performing Active Test, while cranking.	6 to 14 V

3. Using an oscilloscope, measure the waveform immediately after starting.

   Item	Content
   Tester Connection	A34-21 (STA) ←→ A34-6 (DGND)
   Tool Setting	10 V/DIV, 200 ms./DIV
   Condition	During cranking

   OK

   Voltage and waveform both normal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Result

   Proceed to
   OK
   NG

Result: 

OK 

INSPECT ENGINE (ENGINE CONTROL SYSTEM, POOR STARTABILITY) 

Refer to PROBLEM SYMPTOMS TABLE [10/2022 - ]

Result: 

NG 

REPLACE ENGINE STOP AND START ECU 

Refer to REMOVAL [10/2022 - 11/2023] , or refer to REMOVAL [11/2023 - ]

1. Enter the following menus: Powertrain / Stop and Start / Utility / Vehicle Control History (RoB).
2. Select a vehicle control history item to display the data from the time of control.
3. Check the output data.

   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

   Result	Proceed to
   When Starter Motor is ON, there is even 1 point at which Engine Speed < 300 rpm	A
   None of the above conditions are met	B

Result: 

A 

INSPECT STARTER SYSTEM 

Refer to Starter Signal Circuit [10/2022 - 11/2023] , or refer to Starter Signal Circuit [11/2023 - ]

Result: 

B 

See step  13

1. Check how long it took the engine to stall after turning the starter off.

   Result

   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

Result: 

A 

ENGINE CONTROL SYSTEM (ENGINE DIFFICULT TO START) 

Refer to Engine Difficult to Start [10/2022 - ]

Result: 

B 

ENGINE CONTROL SYSTEM (ENGINE STALLS) 

Refer to Engine Stalls [10/2022 - ]