Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Chevrolet >> 2000 >> Tracker 4D Utility, RWD, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics >> Diagnostic Tests >> DTC P0171: Fuel Trim System - Lean (1.6L) >> Circuit Description

Circuit Description

Changes in fuel delivery will be indicated by long term and short term fuel trim values that are displayed on scan tool. Ideal fuel trim valve is about zero percent. PCM will add fuel when oxygen sensor signal is indicating a lean condition. PCM will reduce fuel when oxygen sensor signal is indicating a rich condition. Additional fuel is indicated by fuel trim values that are greater than zero percent. Fuel reduction is indicated by fuel trim values that are less than zero percent.

DTC will set when total fuel trim is greater than 43 percent in 128 firing events, short term fuel trim is equal to or greater than 20 percent in 128 firing events, and barometric pressure is greater than 75 kPa.

scientia non olet · About Mike's Workshop Manuals