Priority of freeze frame data
ECM has 4 frames where the freeze frame data can be stored. The first frame stores the freeze frame data of the malfunction which was detected first. However, the freeze frame data stored in this frame is updated according to the priority described below. (If malfunction as described in the upper square "1" below is detected while the freeze frame data in the lower square "2" has been stored, the freeze frame data "2" will be updated by the freeze frame data "1".)
| Priority | Freeze frame data in frame 1 |
|---|---|
| 1 | Freeze frame data at initial detection of malfunction among misfire detected (P0300 - P0304), fuel system too lean (P0171, P2096) and fuel system too rich (P0172, P2097) |
| 2 | Freeze frame data when a malfunction other than those in "1" above is detected. |
In the 2nd through the 4th frames, the freeze frame data of each malfunction is stored in the order as the malfunction is detected. These data are not updated.
Shown in the table below are examples of how freeze frame data are stored when two or more malfunctions are detected.
| Frame | Frame 1 | Frame 2 | Frame 3 | Frame 4 | |
|---|---|---|---|---|---|
| Malfunction detection order | Freeze frame data | 1st freeze frame data | 2nd freeze frame data | 3rd freeze frame data | |
| 1 | No malfunction | - | - | - | - |
| 2 | P0443 | P0443 data | P0443 data | - | - |
| 3 | P0112 | P0443 data | P0443 data | P0112 data | - |
| 4 | P0117 | P0443 data | P0443 data | P0112 data | P0117 data |
| 5 | P0480 | P0443 data | P0443 data | P0112 data | P0117 data |
| 6 | P0171 | P0171 data | P0443 data | P0112 data | P0117 data |
-: No freeze frame data