Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Chevrolet >> 2001 >> Tracker 2D Utility, 4WD, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics >> Diagnostic Tests >> DTC P0172: Rich Fuel Trim System >> 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 short term fuel trim is equal to or less than 11 percent in 128 firing events, long term fuel trim is equal to or less than 11 percent in 128 firing events and total fuel trim is equal to or less than 30 percent in 128 firing events.

scientia non olet · About Mike's Workshop Manuals