Caution / Notice / Hint

NOTE:

Before replacing the engine stop and start ECU, read the number of starter operations and write it into a new engine stop and start ECU.
Refer to REGISTRATION [12/2019 - 10/2022]
After replacing the engine stop and start ECU or air conditioning amplifier assembly, reset and perform learning of the air conditioning information in the engine stop and start ECU.
Refer to REGISTRATION [12/2019 - 10/2022]
After replacing the engine stop and start ECU or airbag sensor assembly, clear and calibrate the deceleration sensor zero point in the engine stop and start ECU.
Refer to REGISTRATION [12/2019 - 10/2022]
When the engine stop and start ECU or oil pump with solenoid assembly is replaced, check the oil pump with solenoid assembly.
Refer to REGISTRATION [12/2019 - 10/2022]
After replacing the engine stop and start ECU assembly, perform learning of the external backup boost converter (eco run vehicle converter assembly).
Refer to REGISTRATION [12/2019 - 10/2022]
After replacing the starter assembly, perform initialization of the number of starter operations stored in the engine stop and start ECU.
Refer to REGISTRATION [12/2019 - 10/2022]
When the starter assembly is replaced, "ST relay" must be also replaced.
Inspect the fuses for circuits related to this system before performing the following procedure.

HINT:

If other DTCs are output, perform troubleshooting for this DTC first.
Unlike other DTCs that are stored due to a malfunction in parts, circuits or systems, DTC P1603-00 allows determination of a malfunctioning part according to problem symptoms and Freeze Frame Data related to a problem recognized by the customer. As this DTC may be stored due to an operation by the customer, it is not necessary to service the vehicle unless the customer recognized a problem. Clear the DTCs and return the vehicle to the customer.
Using the GTS, read the Freeze Frame Data before troubleshooting. System condition information is recorded as Freeze Frame Data the moment a DTC is stored. This information can be useful when troubleshooting.
Refer to FREEZE FRAME DATA [12/2019 - 10/2022]
DTCs for the stop and start system are not cleared even if the malfunction has been repaired. After repairing the malfunction, be sure to clear the DTCs.
Refer to DTC CHECK / CLEAR [12/2019 - 10/2022]
Stop and Start Control Mode Transition:

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. *1: Engine stop conditions are met.
2. *2: Engine stop judgment is determined.
3. *3: Engine start conditions are met before the engine is judged as stopped.
4. *4: Engine start conditions are met.
5. *5: Engine determined to be started (engine speed reaches a specified rpm).
6. *6: Collision detected or engine hood opened and mode changed to "stalled".
7. *7: 0.6 seconds elapse after engine stop judgment is established.
8. *8: Engine is started using the push start switch assembly.