Actron 9640 user manual Cylinder Cyl Balance Test EEC-IV Vehicles

Ford Historic Self-Test Routines

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.

Select Cyl Balance Test from the Ford Function List and press ENTER.

Ford Function List ? 6)Output Sw Test ]

7)DCL Data [ ` 8)Cyl Balance Test ~

!CAUTION

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

6

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!

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