Circuit Description
WARNING: This page is about a different car, the 2000 Isuzu Hombre. However, it is still accessible from the selected car via links, so may be relevant.
PCM monitors oxygen sensor signal voltage and adjusts fuel delivery based on signal voltage. A change made to fuel delivery is indicated by long and short term fuel trim values. Ideal fuel trim value is about 128 (zero percent).
A fuel trim value of greater than 128 indicates PCM is adding fuel to compensate for a lean condition. A fuel trim value less than 128 indicates PCM is reducing amount of fuel to compensate for rich condition. DTC will set if PCM detects an excessively lean condition.
Conditions for setting this DTC are:
- DTCs P0106, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0125, P0232, P0132, P0133, P0134, P0200, P0300, P0301, P0302, P0303, P0304, P0335, P0341, P0342, P0401, P0404, P0405, P0502, P0503, P0506, P0507, P0601, P0602, P1133, P1404 and P1441 not set.
- IAT is -13-175°F (-25-115°C).
- ECT is 140-239°F (60-115°C).
- Engine speed is 550-3400 RPM.
- Vehicle speed is less than 72 MPH.
- MAP greater than 27 kPa.
- BARO greater than 72 kPa.
- EVAP purge is not occurring.
- Fuel trim index is greater than 160.
- Conditions present for longer than 4 seconds.