Cylinder (cyl) balance test (eec-iv vehicles), Cylinder (cyl) balance test (eec-iv vehicles) -9 – Actron Professional Enhanced Scan Tool 9640A User Manual
Page 69
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Ford Historic Self-Test Routines
6
5) Turn Ign Key Off.
6) Wait 10 Seconds. Turn Key On-Engine Off. Do not Start Engine.
Avoid Cooling Fan! It May Turn On During Test.
The test screen indicates the time
remaining. Do not touch vehicle or tool
keys during this time until the next
screen appears.
Depress the accelerator pedal fully to
turn ON relays and solenoids. Do the
same to turn them OFF. This can be
repeated as many times as required to
locate the fault.
Turn the ignition key Off and press
FUNC
to return to the Ford Function List.
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 cal-
culates variations between cylinders thus identifying the weak ones.
Exhaust gases are harmful or lethal. Always operate vehi-
cle 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.
!
CAUTION
Procedure Runs Less
Than 3 Minutes.
Time Remaining=1:56
Relays & Solenoids |
Are *Off*. Depress &]
Release Throttle
[
Fully To turn On. ~
!
WARNING
!
CAUTION
Ford Function List |
6)Output Sw Test ]
7)DCL Data
[
` 8)Cyl Balance Test ~
!
CAUTION