1.6.3.2 Similar Conditions Function
When a failure in either the misfire or the fuel systems is identified, the engine management system is required to record the conditions present when the fault occurred. The conditions recorded include engine speed, engine load (MAF), and the warm-up status of the first event that resulted in storing a code. These stored conditions are referred to as similar conditions.
When the similar conditions are met without a failure in the misfire or the fuel system, the flag is set to 1. When this flag is set, the driving cycle counter for that failure can be decremented.
The DTC and the stored freeze frame conditions may be erased if similar conditions are not encountered during the next 80 driving cycles that immediately follow the initial malfunction detection.
The MIL may be extinguished after three sequential driving cycles in which similar conditions have been encountered without exceeding the fuel system diagnostic thresholds.
Variables list:
| T_SUM_MIN | Time counter sum below threshold |
| T_SUM_MAX | Time counter sum above threshold |
| LAM. | Short term fuel trim |
| ADAP. | Long term fuel adaptation |
| CTR_LAM_LIM_AD_REQ | counter sum above or below threshold |
Figure 12: Variables List Chart