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Ford OBD1 Systems
ADDITIONAL TESTS FOR EEC-IV SYSTEMS - RELAY AND SOLENOID TEST
40
7. When prompted, lightly press the accelerator pedal half way and
release to activate the cylinder balance test.
For 1986 models ONLY: Fully press accelerator once and
release.
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 Scan Tool.
8. If the vehicle's computer fails to enter Cylinder Balance Test mode,
do the following:
Lightly press the accelerator pedal
again as described in step 7.
9. After the Cylinder Balance Test is
completed, the test results are sent to
the Scan Tool.
10. If all cylinders are contributing equally, a
“System Pass” message displays.
If the computer detects a problem with a cylinder(s) when
performing the initial Cylinder Balance Test, it needs to repeat the
test two more times to properly determine which cylinder or cylin-
ders are malfunctioning.
11. If a cylinder is not contributing at the same level as the other
cylinders, the computer prompts you to repeat the test two more
times by displaying the “Lightly press the accelerator half way and
release” message again. Each time the message displays, perform
the procedures as instructed.
12. After the Cylinder Balance tests have
completed, the computer will identify and
display which cylinder (or cylinders) are
not contributing equally.
If any weak cylinders are identified,
consult the vehicle’s service repair
manual to perform further testing
and/or repairs.
Relay and Solenoid Test (Output State Check)
The "Output State Check" lets you energize (turn ON) and de-energize
(turn OFF), on command, most of the actuators (relays and solenoids)
that are controlled by the vehicle’s computer.
Use this test to check computer output voltages and relay/solenoid
operation.
The fuel injectors and fuel pump are not energized during this
test.
Check your vehicle thoroughly before performing any test.
ALWAYS observe safety precautions whenever working on a
vehicle.
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