Actron CP9190 manual Cylinder Cyl Balance Test EEC-IV Vehicles

Ford Historic (OBD I) Diagnostics

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.

!WARNING

!CAUTION

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.

From the On Demand Test Menu:

1.Select Cyl Balance Test. •Use the UP or DOWN arrow keys until Cyl Balance Test is highlighted.

•Press ENTER.

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On Demand Test Menu

Wiggle Test

Output Sw Test

￿Cyl Balance Test STAR Test Mode Review Data Print Data Tool Setup

!CAUTION

Keep hands and tools away from fan and engine during test.

2.Perform the following: 1) Set parking brake.

2) Transmission in park (P) or neutral (N).

3) Turn A/C off.

4) Start engine and let idle until hot.

5) Turn ignition key off.

6) Wait 10 seconds. Start engine and let idle.

7) If vehicle is equipped with a manual transmission, release clutch.

Press ENTER to continue.

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