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Home >> Toyota >> 2023 >> Prius LE >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System - Diagnostic Codes (P050B-P0627) >> SFI System >> DTC P0604-44: Internal Control Module Random Access Memory (RAM) Error Data Memory Failure [03/2023 - ] >> Caution / Notice / Hint
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Caution / Notice / Hint

NOTE:
  • After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) battery terminal.

    Refer to BEFORE DISCONNECTING BATTERY [12/2022 - ]

  • When disconnecting and reconnecting the battery.

    HINT: 

    When disconnecting and reconnecting the battery, there is an automatic learning function that completes learning when the respective system is used.

    Refer to AUTOMATIC LEARNING CHART [03/2023 - ]

  • Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.

    for HEV Model: Refer to VEHICLE CONTROL HISTORY (RoB) [12/2022 - ]

    for PHEV Model: Refer to VEHICLE CONTROL HISTORY (RoB) [03/2023 - ]

    (Select Powertrain in Health Check and then check the time stamp data.)

  • If any "Engine Malfunction" Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Vehicle Control History.

    for HEV Model: Refer to VEHICLE CONTROL HISTORY (RoB) [12/2022 - ]

    for PHEV Model: Refer to VEHICLE CONTROL HISTORY (RoB) [03/2023 - ]