P1174 BUICK, CADILLAC, CHEVROLET, GMC, ISUZU, PONTIAC, SATURN - FUEL TRIM CYLINDER BALANCE
POST UPDATED IN June, 2023
P1174 BUICK, CADILLAC, CHEVROLET, GMC, ISUZU, PONTIAC, SATURN - FUEL TRIM CYLINDER BALANCE
The function of the fuel cylinder balance diagnostic is to check for fuel mixture imbalances between a rich and lean cylinder. It monitors the frequency and amplitude characteristics of the oxygen sensor (HO2S) signal upstream of the catalytic converter. Therefore, it calculates the voltage that builds up over a predetermined time.
When an unbalance is found, it is because several samples of the accumulated voltage turn out to have inconsistencies higher than the expected value. After that, the diagnostic code P1174 OBDII will be set.
The causes of storing the P1174 OBD2 fault code are:
The steps to troubleshoot the OBDII DTC P1174 are: