DTC AND 1ST TRIP DTC (FOR TWO TRIP DETECTION LOGIC THAT MIL TURNS ON)

- The 1st trip DTC number is the same as DTC number.
- When detecting malfunction at the 1st trip, TCM stores the 1st trip DTC. MIL does not turns ON at this step. When not detecting the same malfunction at the 2nd trip (required driving conditions met), the 1st trip DTC is erased from TCM memory. When detecting the same malfunction at the 2nd trip, TCM stores DTC and MIL turns ON simultaneously.
- The 1st trip DTC is defined in Service $07 of JIS D 5405-2 (Service $07 of ISO 15031-5). MIL is not turned ON by the 1st trip DTC detection.
- For the procedure to erase DTC and the 1st trip DTC from TCM memory, refer to “How to Erase DTC and 1st Trip DTC” of CONSULT-III Function (GT-R certified NISSAN dealer).

FREEZE FRAME DATA AND 1ST TRIP FREEZE FRAME DATA (FOR TWO TRIP DETECTION LOGIC)

- TCM stores driving conditions at the moment malfunction is detected, such as engine speed, vehicle speed, range, and accelerator pedal opening.
- Data stored with DTC are called freeze frame data. Both DTC and freeze frame data are indicated on the CONSULT-III screen.
- After the Freeze frame data of the 1st trip DTC are stored, they are not updated even when the same DTC is detected at the 2nd trip. In this case, the data stored at the malfunction occurrence of the 1st trip.
- TCM can store four freeze frame data or freeze frame data of the 1st trip DTC. When the fifth DTC or the 1st trip DTC is detected, the oldest freeze frame data or the freeze frame data of the 1st trip DTC is updated.
- When TCM memory is erased, freeze frame data or that of the 1st trip DTC is erased (together with DTC).