Caution / Notice / Hint

HINT: 

• DTC P1604
  • In contrast to normal malfunction diagnosis for components, circuits and systems, DTC P1604 is used to determine the malfunctioning area from the problem symptoms and Freeze Frame Data when the user mentions problems such as starting difficulty.

    As this DTC can be stored as a result of certain user actions, even if the DTC is output, if the customer makes no mention of problems, clear the DTC without performing any troubleshooting and return the vehicle to the customer.

  • As DTCs may be stored when an Active Test or learning is performed, make sure to clear the DTCs before returning the vehicle to the customer.
  • If any other DTCs are output, perform troubleshooting for those DTCs first.
• DATA LIST / FREEZE FRAME DATA
  • Read Freeze Frame Data using the Techstream. Freeze frame data records engine conditions when a malfunction occurs. This information can be useful when troubleshooting.
  • When confirming the Freeze Frame Data, be sure to check all 5 sets of Freeze Frame Data.

    Refer to FREEZE FRAME DATA [04/2020 - 11/2022]

  • When confirming the Freeze Frame Data, if there are multiple items related to the cause of the malfunction, perform troubleshooting for all related items.
  • Try to start the vehicle under the conditions recorded in the Freeze Frame Data which were present when the malfunction occurred. Confirm the data at this time and compare it with the Freeze Frame Data.
  • If the malfunction does not recur, carefully check the vehicle conditions from when the malfunction occurred using Freeze Frame Data.
• PRECAUTIONS
  • When performing inspections, jiggle the relevant wire harnesses and connectors in an attempt to reproduce malfunctions that do not always occur.
  • If the same inspection or replacement procedure appears 2 times when performing an inspection procedure, it is not necessary to repeat the procedure the second time.