Diagnostic Method
WARNING: This page is about a different car, the 2013 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
Fuel system is diagnosed by comparing the target air fuel ratio calculated by ECM with the actual air fuel ratio measured by sensor.
- Abnormality Judgment
Compare the diagnostic value (fsobd) with the threshold value, and if a condition meeting the malfunction criteria below continues for 10 s x 5 time(s) or more, judge that there is a fault in the fuel system.
JUDGMENT VALUE
| Malfunction Criteria | Threshold Value |
|---|---|
| fsobd = (sglmd - tglmda) + faf + flaf | ≤ Value from Map 2 |
| In this case: sglmd = measured lambda | |
| tglmda = target lambda | |
| faf = main feedback compensation coefficient (every 64 milliseconds) | |
| flaf = main feedback learning compensation coefficient |
MAP 2
| Amount of air (g (oz)/s) | 0 (0) | 3.2 (0.11) | 6.4 (0.23) | 9.6 (0.34) | 12.8 (0.45) | 16 (0.56) | 19.2 (0.68) |
| fsobdL1 (%) | 1.4 | 1.4 | 1.332 | 1.25 | 1.25 | 1.25 | 1.25 |
Time Needed for Diagnosis: 10 s x 5 time(s)
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.
- Normality Judgment
Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.
JUDGMENT VALUE
| Malfunction Criteria | Threshold Value |
|---|---|
| fsobd = (sglmd - tglmda) + faf + flaf | < 1.15 |
Time Needed for Diagnosis: 10 s