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Retrieving Codes
ADDITIONAL TESTS FOR EEC-IV SYSTEMS
Chapter 4 42
■ The computer is now in Cylinder Balance Test Mode,
and will start cutting fuel to each cylinder in sequence
to determine if all the cylinders are contributing
equally. It may take up to five minutes before the
test results are transmitted to the Code Reader.
7. After the computer finishes performing the Cylinder
Balance Test, the test results are sent to the Code Reader
in the form of two digit codes.
■ The computer compares the power contribution that
each cylinder makes to engine operation. If a cylinder
is not contributing at the same level as the other
cylinders, the computer sends a two digit code to the
Code Reader that identifies that particular cylinder
(see code description below).
■ If all cylinders are contributing equally, the computer
sends a pass code (code 90) to the Code Reader to
indicate that the system is OK, and that all cylinders
are contributing equally.
Cylinder Balance Test Code Definitions
CODE CODE DEFINITION
10 Cylinder #1 has a problem
20 Cylinder #2 has a problem
30 Cylinder #3 has a problem
40 Cylinder #4 has a problem
50 Cylinder #5 has a problem
60 Cylinder #6 has a problem
70 Cylinder #7 has a problem
80 Cylinder #8 has a problem
90 System is OK, all cylinders are
contributing equally
NOTE:
The severity of an improperly contributing
cylinder may be anywhere from mild to no
contribution at all. In order for the computer to
determine the severity of an improperly contributing
cylinder, the Cylinder Balance Test may have to be
consecutively repeated up to three times
4
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