User Manual

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• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Ford Historic Diagnostics
5
A Vehicle Data List header marks the
beginning of the data list. Use the
83'2:1 arrow keys to scroll through the
PIDs.
When done, press
%$&. to return to the Ford Function List.
CYL BALANCE TEST (EEC-IV VEHICLES)
✓ The Cyl Balance Test (Cylinder Balance Test) is only applicable to engines
equipped with EEC-IV Sequential Electronic Fuel Injection (SEFI or SFI) .
The Cyl Balance Test identifies a weak cylinder(s) on EEC-IV vehicles. A weak
cylinder may be caused by low compression, poor valve seating, fouled spark
plugs, damaged fuel injectors, and other cylinder faults. The PCM shuts off the
fuel supply to each cylinder and measures the RPM drop. The PCM then
calculates variations between cylinders thus identifying the weak ones.
Exhaust gases are harmful or lethal. Always operate vehicle
in a well-ventilated area.
The Cyl Balance Test is done with the engine running
. Do
not over-rev engine. Observe all safety precautions.
Select Cyl Balance Test from the Ford
Function List and press
(17(5 .
Keep hands and tools away from fan and engine during
test.
Follow the instructions on the tool screen that prompt the user to:
1) Set Parking Brake.
2) Put Transmission In Park Or Neutral.
3) Turn A/C Off.
4) Start Engine — Let Idle Until Hot.
5) Turn Ign Key Off.
6) Wait 10 Seconds. Start Engine — Let Idle.
7) If Vehicle Has A Manual Trans., Release Clutch.
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