Diagnostic Aids
Perform this test when directed by QUICK TEST. PCM uses adaptive fuel logic to compensate for normal variances in fuel system components. If fuel system appears to be too rich or too lean, adaptive fuel will make appropriate shift in fuel delivery calculations to compensate.
If possible, measure several known good MAP/BARO sensors. Average voltage reading will be typical for location and day of testing.
| Elevation (Feet) | Volts |
|---|---|
| 0 | 1.55-1.63 |
| 1000 | 1.52-1.60 |
| 2000 | 1.49-1.57 |
| 3000 | 1.46-1.54 |
| 4000 | 1.43-1.51 |
| 5000 | 1.40-1.48 |
| 6000 | 1.37-1.45 |
| 7000 | 1.35-1.43 |
| Acronym | Definition |
|---|---|
| HO2S | Heated Oxygen Sensor |
| KAM | Keep-Alive Memory |
1) Continuous Memory Codes 181, 183, 189 & 192 These codes identify a lean fuel condition resulting in adaptive fuel strategy enriching fuel system to compensate.
- Code 183
Indicates single right or rear HO2S detected a problem and adaptive fuel rich limit has been reached at idle.
- Code 192
Indicates left or front HO2S detected a problem and adaptive fuel rich limit has been reached at idle.
- Code 181
Indicates single right or rear HO2S detected a problem and adaptive fuel rich limit has been reached.
- Code 189
Indicates left or front HO2S detected a problem and adaptive fuel rich limit has been reached.