LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Toyota >> 2005 >> Matrix Base, FWD, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> Engine Control System (SFI) (1ZZ-FE (Fwd)) - Diagnostics >> SFI System (1ZZ-FE (Ff)) >> DTC P0171, P0172: System Too Lean/Rich (Bank 1) >> Typical Enabling Conditions
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Typical Enabling Conditions

Fuel-trim: 

TYPICAL ENABLING CONDITIONS (DTC P0171/0172)

Monitor runs whenever following DTCs not present See LIST OF DISABLE A MONITOR 
Fuel system status Closed-loop for more than 13 seconds
Battery voltage 11V or more
Throttle position learning Completed
Either of following conditions A or B set -
A. Engine RPM Below 1,100 RPM
B. Intake air amount per revolution 0.14 g/rev or more