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ADDITIONAL TESTS FOR EEC-IV SYSTEMS - RELAY AND SOLENOID TEST
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 cylinders are malfunctioning. If this is
the case, the CanOBD2&1 Scan Tool will display the
"Lightly press the accelerator half way and release"
message again instead of the "System Pass". Proceed to
step 11.
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 repeat Cylinder Balance tests
have completed, the computer will
identify which cylinder (or cylinders) are
not contributing equally, and will send
this information to the CanOBD2&1
Scan Tool's display.
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" is a special program in the vehicle's computer
that allows the user to energize (turn ON) and de-energize (turn OFF),
on command, most of the actuators (relays and solenoids) that are
controlled by the 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.
See BEFORE YOU BEGIN on page 18 for details.
ALWAYS observe safety precautions whenever working on a
vehicle.
Read and follow Safety Precautions on page 3 before perform-
ing this test.
1. Locate the vehicle's Data Link Connector (DLC). See Data Link
Connector (DLC) on page 77 for connector location.
Some DLCs have a plastic cover that must be removed before
connecting the CanOBD2&1 Scan Tool cable connector.
CanOBD2&1
Ford OBD1 Systems
91
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