DTC P0171 Fuel Trim System Lean

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Circuit Description

To provide the best possible combination of driveability, fuel economy, and emission control, a closed loop air/fuel metering system is used. While in closed loop, the PCM monitors the HO2S 1 signal and adjusts fuel delivery based upon the HO2S signal voltage. A change made...

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Service Manual Table of Contents

Document Tags

Document Title: DTC P0171 Fuel Trim System Lean

fuel

emission

control

closed

loop

system

indicated

short

term

trim

scan

tool

lean

condition

maximum

authority

operating

diagnostic

idle

purge

commanded

cell

vehicle

sensor

injector

speed

engine

intake

manifold

pressure

throttle

mass

action

consecutive

test

failed

present

records

data

clear

aids

check

wiring

exhaust

poor

grounds

balance

vacuum

leaks

damaged

airflow

water

alcohol

this

contaminants

inspect

harness

observe

display

indicate

value

powertrain

diagnosis

displayed

specified

operate

duplicate

visually

physically

problem

found

repair

valve

perform

electrical

term fuel

fuel trim

trim cells

diagnostic aids

system lean

fuel system

system pressure

pressure test

fuel injector

injector balance

balance test

system check

specified value

operate vehicle

vehicle duplicate

operating vehicle

duplicate records

physically inspect

repair problem

test fuel

short term fuel

term fuel trim

fuel trim values

fuel trim cells

deceleration purge commanded

normal driving purge

driving purge commanded

fuel trim maximum

trim maximum authority

fuel system pressure

system pressure test

fuel injector balance

injector balance test

sensor mass airflow

mass airflow sensor

airflow sensor replacement

alcohol contaminants fuel

contaminants fuel test

powertrain board diagnostic

vehicle closed loop

review record scan

record scan tool

scan tool records

tool records data

operate vehicle duplicate

monitor scan tool

operating vehicle duplicate

vehicle duplicate records

continue operating vehicle

test result scan

result scan tool

scan tool indicate

visually physically inspect

found repair problem

repair problem found

feed pipes vacuum

found repair repair

repair repair procedures

repair procedures electrical

diagnosis problem found