Freeze Frame Data

• The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was moving or stationary, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

  Freeze frame data records the engine conditions (fuel system information, calculated load, engine coolant temperature, fuel trim, engine speed, vehicle speed, etc.) when a malfunction is detected.

  HINT: 

  If it is impossible to duplicate the problem even though a DTC is output, check the freeze frame data.

• The ECM records engine conditions in the form of freeze frame data every 0.5 seconds. Using the Techstream, 5 separate sets of freeze frame data can be checked.
  Fig 1: Identifying Freeze Frame Data Graph

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  • 3 data sets from before the DTC was stored
  • 1 data set from when the DTC was stored
  • 1 data set from after the DTC was stored

These data sets can be used to simulate the condition of the vehicle from around the time of the occurrence of the malfunction. The data may assist in identifying the cause of the malfunction, and in judging whether it was temporary or not.

HINT: 

Pending freeze frame data is stored when a 2 trip DTC is first detected during the first trip.

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
5. Select a DTC in order to display its pending freeze frame data.

   HINT: 

   • Pending freeze frame data is cleared when any of the following occurs.
     • Using the Techstream, the DTCs cleared.
     • The cable is disconnected from the negative (-) battery terminal.
     • 40 trips with the engine fully warmed up have been performed after returning to normal. (Pending freeze frame data will not be cleared by only returning the system to normal.)
   • With previous pending freeze frame data stored, if pending freeze frame data is newly stored when a 2 trip DTC is detected in the first trip, the old freeze frame data will be replaced with the new one of the newly detected DTC in the next trip.
   Fig 2: Identifying Two Trip Detection Example With Diagnostic Trouble Codes

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   Fig 3: Identifying Two Trip DTC First Detected In First Trip And Another Two Trip DTC Is First Detected In Second Trip

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Refer to "Data List / Active Test". Refer to DATA LIST / ACTIVE TEST .