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Ford Historic Self-Test Routines
6
Cylinder (Cyl) Balance Test (EEC-IV Vehicles)
✓The Cyl 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
ENTER
.
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.
After pressing
ENTER
to continue, the scan tool waits for the Cylinder ID.
Once the ID is received, a Read KOER Self-Test begins. Follow all user
prompts:
❒Work Steering Wheel
❒Pump Brake Pedal & Cycle OD (overdrive) Cancel Switch.
✓Observe Screen for Prompt to Perform the next action.
❒Quickly Press And Release Throttle. One Time Only!
!
WARNING
!
CAUTION
Ford Function List ?
6)Output Sw Test ]
7)DCL Data [
`8)Cyl Balance Test ~
!
CAUTION