Typical Malfunction Thresholds
| Both of the following conditions 1 and 2 are met | - |
| 1. Average engine load value ratio | Less than 0.84, or more than 1.15 (varies with estimated engine load) (except U880F) Less than 0.85, or more than 1.18 (varies with estimated engine load) (for U880F) |
| 2. Average air-fuel ratio | Less than -20%, or more than 20% |