Ford Historic (OBD I) Diagnostics
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6
✓If throttle is moved after pressing and releasing the Scan Tool
displays an error message indicating the test failed due to throttle
movement.
✓Noise from the throttle position sensor (TPS) may cause the test
to abort even though the throttle was not moved.
5. View test results.
✓If the engine operates properly, the
screen to the right displays. Press
ENTER to continue.
✓If a problem exists with one or
more cylinders, the Scan Tool
displays a list of failed cylinder(s).
Press
ENTER to continue.
✓Refer to the applicable service
manual for cylinder numbering
sequence. Cylinder failure may be
caused by faulty injectors, sparks
plugs, or wiring.
✓Press ENTER to continue — the Scan Tool prompts the user to
retest (up to three times). If required, rerun the test to double check
the results, or to check for weaker or dead cylinders.
6. Return to On Demand Test Menu.
•Press BACK.
Stage 1 completed.
Code 90: Cylinder
balance test passed.
Press ENTER to cont.
Cyl Balance Test
Stage 1 completed.
Failed cylinders:
1
Press ENTER to cont.
Cyl Balance Test