DTC and Freeze Frame Data

DIAGNOSIS SYSTEM (LBC)

DIAGNOSIS DESCRIPTION : DTC and Freeze Frame Data


DTC AND 1ST TRIP DTC

The following shows 2nd trip detection diagnosis that illuminates the MIL.
The 1st trip DTC number is the same as the DTC number.
If a malfunction is detected during the 1st trip, the 1st trip DTC is saved in the Li-ion battery controller (LBC)
memory. At this time, the MIL does not illuminate. Some of the diagnoses illuminate the hybrid system warning lamp and other diagnoses do not illuminate them.
If the same malfunction is not detected in the 2nd trip (meeting the required driving pattern), the 1st trip DTC is cleared from the LBC memory. If the same malfunction is detected in the 2nd trip, both the 1st trip DTC and
DTC are saved in the LBC memory and the MIL, the hybrid system warning lamp illuminate.
The procedure for erasing the DTC and the 1st trip DTC from LBC memory is described in "How to Erase DTC
and 1st Trip DTC" in Hybrid Battery System.
Refer to Testing and Inspection for the malfunctions for which the 1st trip DTC is displayed.
1st trip DTC is specified in Service $07 of SAE J1979/ISO 15031-5.
When a 1st trip DTC is detected, check, print out or write down and erase (1st trip) DTC and Freeze Frame data as specified in Work Flow procedure Step 2, Work Flow.
Then perform DTC Confirmation Procedure or Component Function Check to try to duplicate the malfunction.
If the malfunction is duplicated, the item requires repair.

FREEZE FRAME DATA AND 1ST TRIP FREEZE FRAME DATA

LBC stores the Li-ion battery status, such as voltage, current, temperature, and SOC (state of charge) at malfunction detection.
Data which are stored in the LBC memory, along with the 1st trip DTC, are called 1st trip freeze frame data.
The data, stored together with the DTC data, are called freeze frame data and displayed on CONSULT or
GST. The 1st trip freeze frame data can only be displayed on the CONSULT screen.
LBC can store three sets of freeze frame data (one set for MIL-illuminating DTC and two sets for non-MIL-illuminating DTC). 1st trip freeze frame data is stored in the LBC memory along with the 1st trip DTC.
For MIL-illuminating DTC, there is no priority for 1st trip freeze frame data and it is updated each time a different 1st trip DTC is detected. However, once freeze frame data (2nd trip detection/MIL on) is stored in the LBC
memory, 1st trip freeze frame data is no longer stored. Remember, only one set of freeze frame data can be stored in the LBC.
For non-MIL-illuminating DTC, the freeze frame data of the 1st trip DTC has no priority. Every time another 1st trip DTC is detected after two freeze frame data of the 1st trip DTC are stored, the older freeze frame data is updated. However, once freeze frame data (2nd trip detection/MIL on) is stored in the LBC memory, 1st trip freeze frame data is no longer stored. Remember, only one set of freeze frame data can be stored in the LBC.
The LBC has the following priorities to update the data.





Both 1st trip freeze frame data and freeze frame data (along with the DTC) are cleared when the LBC memory is erased. For the procedure for erasing the LBC memory, refer to "How to Erase DTC and 1st Trip DTC" of
Hybrid Battery System.