DTC P0172 Fuel Trim System Rich

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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 P0172 Fuel Trim System Rich

fuel

emission

control

closed

loop

system

hos

change

short

term

trim

scan

tool

condition

rich

maximum

authority

operating

diagnostic

idle

purge

commanded

cell

vehicle

complete

sensor

evap

injector

speed

engine

kpa

pressure

throttle

angle

mass

action

consecutive

test

failed

present

records

data

clear

aids

check

balance

evaporative

disconnect

replace

airflow

replacement

regulator

vacuum

presence

problem

found

intermittent

inspect

harness

observe

display

indicate

value

powertrain

specified

operate

duplicate

monitor

visually

physically

repair

ignition

perform

hose

term fuel

fuel trim

rich condition

trim cells

diagnostic aids

fuel pressure

fuel system

system pressure

pressure test

fuel injector

injector balance

balance test

sensor replacement

pressure regulator

system check

display scan

specified value

operate vehicle

vehicle duplicate

operating vehicle

physically inspect

found repair

repair problem

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

evaporative emission control

emission control system

sensor mass airflow

mass airflow sensor

airflow sensor replacement

fuel pressure regulator

pressure regulator fuel

pressure regulator replacement

powertrain board diagnostic

vehicle closed loop

fuel trim display

trim display scan

review record scan

record scan tool

scan tool records

tool records data

operate vehicle duplicate

fail records conditions

monitor scan tool

scan tool specific

operating vehicle duplicate

vehicle duplicate records

continue operating vehicle

test result scan

result scan tool

scan tool indicate

visually physically inspect

problem found repair

found repair problem

repair problem found

display scan tool