Freeze Frame Data and 1ST Trip Freeze Frame Data

FREEZE FRAME DATA AND 1ST TRIP FREEZE FRAME DATA
The ECM has a memory function, which stores the driving condition such as fuel system status, calculated load value, engine coolant temperature, short term fuel trim, long term fuel trim, engine speed and vehicle speed at the moment the ECM detects a malfunction.
Data which are stored in the ECM memory, along with the 1st trip DTC, are called 1st trip freeze frame data, and the data, stored together with the DTC data are called freeze frame data. The 1st trip freeze frame data can only be displayed on the CONSULT screen, not on the GST.
Only one, either 1st trip freeze frame data or freeze frame data can be displayed. Therefore, the ECM has the following priorities to update the data.




For example, the EGR malfunction (Priority: 2) was detected and the freeze frame data was stored in the 1st trip. After that when the misfire (Priority: 1) is detected in another trip, the freeze frame data will be updated from the EGR malfunction to the misfire. If data already stored in the ECM memory and data which occurs later have the same priority, the preceding freeze frame data remains unchanged in the ECM memory. 1st trip freeze frame data is replaced by the most recent data. Both the freeze frame data and 1st trip freeze frame data are cleared from the ECM memory, along with DTC using procedures.