Cylinder Balance Test:
• Before using Cylinder Balance Test, Performance Diagnostic routines should be followed to insure no other performance concerns are present.
• Cylinder Balance Test measures the increase of engine RPM during each firing cycle. The test then compares the RPM contribution of each individual cylinder to determine a weak cylinder.
When performing Cylinder Balance you should use the following procedure:
• Using WDS, connect to the vehicle and perform a POWER BALANCE TEST.
• With POWER BALANCE still running switch to DATALOGGER and select an injector PID (1-8, it doesn’t matter which one). Highlight the injector pid and take active command of the pid. Do not shut the injector off.
• The FICM has a fuel correction feature that is used to smooth idle operation by adding fuel to any cylinder that lowers engine speed during a firing cycle.
• Following these steps will disable the FICM’s fuel correction feature. Taking active command of an injector will cause all eight injectors to use a base line fuel rate.
• Using the tabs at the top of the screen switch back to the POWER BALANCE and look for any injector that falls below 15 RPM.
• If a cylinder drops below 15 RPM perform an INJECTOR ELECTRICAL TEST and a RELATIVE COMPRESSION TEST to check for base engine problems. If no other problems are found replace the injector for the indicated cylinder.
• Note: Active command will only disable fuel correction for about 1 min.
