Equus 3140 - Scan Tool CanOBD2&1 Kit - Manual (Page 83)

CanOBD2&1 81
E
Ford OBD1 Systems
ADDITIONAL TESTS FOR EEC-IV SYSTEMS -RELAY AND SOLENOID TEST
■ Check your vehicle's fuel injection system and make sure that it
is a Sequential Electronic Fuel Injection (SEFI) system. This test
is applicable only to SEFI or SFI systems.
9. After the Cylinder Balance Test is com-
pleted, the test results are sent to the
CanOBD2&1 Scan Tool.
■ The computer compares the power
contribution that each cylinder makes
to engine operation.
10. If all cylinders are contributing equally,
the computer determines that power dis-
tribution is normal and a “System Pass”
message will display.
If the computer detects a prob-
lem 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 cylin-
ders, 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 iden-
tify 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 com-
puter 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.