Equus 3120 - OBD 2&1 Tool Kit - Manual (Page 58)

56 OBD2 & 1
E
Ford OBD1 Systems
ADDITIONAL TESTS FOR EEC-IV SYSTEMS - CYLINDER BALANCE TEST
■ See Viewing DTCs in the Tool's Memory on page 13 to view
DTCs stored in the Tool's memory.
All retrieved DTCs will remain in the Tool's memory. If the
KOER Test procedure is performed again, DTC's from a prior
test will automatically clear and will be replaced by the most
current DTCs retrieved.
12. All KOER codes that are retrieved by the Tool during the KOER Self-
Test represent problems that are present now (at the time the test
is performed). The related vehicle problems that caused the codes
to be sent must be repaired using the procedures described in the
vehicle's repair manual.
The green, yellow and red LEDs are used (with the LCD dis-
play) as visual aids to make it easier to determine engine sys-
tem conditions. See Servicing Diagnostic Trouble Codes
on page 78 for information on interpreting LEDs and servic-
ing DTCs.
13. After all repairs have been completed, repeat the KOER Self-Test.
14. If a "pass code" (code 11 or 111) is
received, it indicates that the repairs
were successful and all the related sys-
tems are working properly.
15. If a "pass code" (code 111 or 111) is not
received, the repair was unsuccessful.
Consult the vehicle's service manual
and recheck repair procedure.
ADDITIONAL TESTS FOR EEC-IV SYSTEMS
These tests are additional, supplemental tests, and are not
needed to retrieve Diagnostic Trouble Codes. Ford has
included them to further assist the technician / do-it-your-
selfer in the troubleshooting of vehicle problems.
Cylinder Balance Test (Vehicles equipped with Sequential
Electronic Fuel Injected (SEFI) systems only)
The Cylinder Balance Test assists in finding a weak or noncontributing
cylinder. The computer shuts off fuel (cuts off power to injectors) to
each cylinder, in sequence, and monitors for RPM changes (drop).
Based on this information, the computer determines if all the cylinders
are contributing power equally (for proper engine operation), or if some
cylinders are only contributing partially or not contributing at all.