P1174 HUMMER – Fuel Trim Cylinder Balance Bank 1

P1174 HUMMER Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P1174 HUMMER Possible Causes

Clogged Fuel Injectors,Faulty Oxygen sensor,Ignition problem,Fuel injection problem,Engine mechanical condition

P1174 HUMMER Description

The Fuel Trim Cylinder Balance diagnostic detects a rich or lean cylinder to cylinder air/fuel ratio imbalance in each bank. The diagnostic monitors the pre-catalyst heated oxygen sensor (HO2S) signal’s frequency and amplitude characteristics by calculating an accumulated voltage over a predetermined sample period. An imbalance is indicated when multiple samples of the accumulated voltage are consistently higher than the desired value.