Equus 3145 - Digital Ford Code Reader (1981 - 1995) - Manual (Page 46)

Retrieving Codes
ADDITIONAL TESTS FOR EEC-IV SYSTEMS
43 Chapter 4
■ The Cylinder Balance Test can be repeated by
pressing and releasing accelerator pedal (as described
in step 6, on page 41) within two minutes after the
last cylinder balance code is retrieved.
Use the A, B, C, and D examples in the "TEST
RESULTS CHART" to determine the meaning of the
test results. The chart uses the #2 cylinder as an
example, but the procedures are the same for any
cylinder.
TEST RESULTS CHART
Test Results Chart (Examples) Explanation
A: If a code 90 is retrieved the 1st time the cylinder balance
test is performed (example A in TEST RESULTS
CHART), the system is OK, and no further testing is
required. Proceed to step 8.
4
TEST RESULTS TEST PROBLEM POSSIBLE
1st 2 nd 3rd DEFINITION INDICATION CAUSE
A 90 * * System passed System passed. •System OK
1st test All cylinders are
contributing
equally.
B 20 90 * Fails 1st test Weak cylinder, •Bad spark plug
Passes 2nd test cylinder is firing, wire or spark plug
but not contribu- •Partially clogged
ting the same as
injector or injector
the others circuit problem
•Mechanical
problem - rings,
valves, etc.
C 20 20 90 Fails 1st test Same as above, but • Same as above,
Fails 2nd test condition is more but the condition
Passes 3rd test severe. is more severe.
D 20 20 20 Fails 1st test Very weak or dead • Bad spark plug
Fails 2nd test cylinder wire or spark plug
Fails 3rd test •Open or shorts on
injector circuit,
clogged injector
•Mechanical
problem - rings
valves, etc.