Diagnostic Method
Compare the diagnostic value with the threshold value, and if a condition meeting the criteria continues for 10 s x 3 times or more, judge that there is a fault in the fuel system.
JUDGMENT VALUE SPECIFICATION
| Malfunction Criteria | Threshold Value |
|---|---|
| Diagnostic value {[Short term fuel trim B1] + [Long term fuel trim B1] + ([A/F Sensor #1] - [Target Equivalence Ratio]) x 100} |
Less than value of Map |
WARM-UP INCREASE COMPENSATION COEFFICIENT SPECIFICATION - MAP
| Warm-up increase compensation coefficient | 0 | 0.05 | 0.1 | 0.14 | 0.2 | 0.25 |
|---|---|---|---|---|---|---|
| Threshold Value | 0.65 | 0.6 | 0.56 | 0.51 | 0.47 | 0.44 |
WARM-UP INCREASE COMPENSATION COEFFICIENT SPECIFICATION - MAP
| Warm-up increase compensation coefficient | 0.3 | 0.35 | 0.39 | 0.45 | 0.5 | 0.55 | 0.6 |
|---|---|---|---|---|---|---|---|
| Threshold Value | 0.41 | 0.36 | 0.34 | 0.31 | 0.29 | 0.27 | 0.24 |
Time needed for diagnosis: 10 s x 3 times
Malfunction indicator light illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.
NOTE:
When a short period (distance) driving from the engine start to stop is repeated, engine warm-up followed may cause detection of P0172 due to gasoline evaporation within the engine oil and blow-by gas increase.