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Ford OBD1 Systems
ADDITIONAL TESTS FOR EEC-IV SYSTEMS - CYLINDER BALANCE TEST
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ADDITIONAL TESTS FOR EEC-IV SYSTEMS
These tests are additional, supplemental tests, and are not
needed to retrieve Diagnostic Trouble Codes. They are
included to further assist in troubleshooting vehicle problems.
Cylinder Balance Test (Vehicles equipped with Sequential
Electronic Fuel Injected (SEFI) systems only)
The Cylinder Balance Test assists in finding a weak or noncontributing
cylinder. The computer shuts off fuel (cuts off power to injectors) to each
cylinder, in sequence, and monitors for RPM changes (drop). Based on
this information, the computer determines if all the cylinders are
contributing power equally (for proper engine operation), or if some
cylinders are only contributing partially or not contributing at all.
Cylinder Balance Test Procedure
Check your vehicle thoroughly before performing any test.
ALWAYS observe safety precautions whenever working on a
vehicle.
1. Locate the vehicle's Data Link Connector (DLC).
Some DLCs have a plastic cover that must be removed before
connecting the Scan Tool cable connector.
2. Connect the Scan Tool (with the Ford Connector Cable Adaptor
attached) to the vehicle's DLC. Connect the Scan Tool to BOTH
connectors. Press POWER/LINK
to turn the Scan Tool ON,
then press ENTER
to continue.
The Ford Menu displays.
3. Highlight Cylinder Balance Test, then
press ENTER
.
An advisory message displays. If
the vehicle is not equipped with
Sequential Electronic Fuel Injection
(SEFI), press SYSTEM MENU
to exit. Otherwise, press ENTER
to continue.
4. An “instructional” message displays. Start and warm the engine to
normal operating temperature. Press ENTER
to continue.
5. When prompted, turn off all vehicle accessories, turn ignition key
OFF and wait for the on screen prompt. If you wish to exit the
Cylinder Balance test at this time, press SYSTEM MENU
.
6. When instructed, start the engine and press ENTER
.
A "One moment please preparation for test is in progress..."
message shows temporarily.
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