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Ford OBD1 Systems<br />
ADDITIONAL TESTS FOR EEC-IV SYSTEMS - CYLINDER BALANCE TEST<br />
SEFI Introduction<br />
Sequential Electronic Fuel Injection (SEFI) belongs to a family of fuel<br />
injection systems called "Multi-port/Multipoint Fuel Injection". Multi-port<br />
(MFI) fuel injection systems contain one fuel injector per cylinder, and<br />
the vehicle's computer electronically controls their operation. On some<br />
multi-port fuel injection systems, the injectors all fire at the same time<br />
and at every engine revolution. On other systems the injectors fire in<br />
groups and/or at every other engine revolution. What distinguishes<br />
Sequential Electronic Fuel Injection systems from other multi-port fuel<br />
injection systems is that each injector is independently energized and<br />
fires sequentially one after the other in the proper firing order. This gives<br />
the vehicle's computer more control to cut the fuel to one injector at a<br />
time (this can't be accomplished on the other systems because they fire<br />
in groups of two ore more injectors).<br />
Cylinder Balance Test Procedure<br />
Check your vehicle thoroughly before performing any test. See<br />
BEFORE YOU BEGIN on page 31 for details.<br />
ALWAYS observe safety precautions whenever working on a<br />
vehicle. Read and follow Safety Precautions on page 3 before<br />
performing this test.<br />
1. Locate the vehicle's Data Link Connector (DLC). See TEST<br />
CONNECTORS on page 63 for connector location.<br />
Some DLCs have a plastic cover that must be removed before<br />
connecting the Tool cable connector.<br />
2. Connect the Tool cable (with the Ford<br />
Connector Cable Adaptor attached) to<br />
the Tool, then connect the adaptor to<br />
the vehicle's DLC. Press the<br />
POWER/LINK button to turn the<br />
Tool ON, then press the ENTER<br />
button to continue.<br />
� The Ford OBD1 Menu displays.<br />
Use the and buttons, as<br />
necessary, to make menu selections.<br />
3. From the Ford OBD1 Menu, highlight<br />
Cylinder Balance Test, then press the<br />
ENTER button.<br />
� An advisory message displays. If the vehicle is not equipped<br />
with Sequential Electronic Fuel Injection (SEFI), press the LD/M<br />
button to exit. Otherwise, press the ENTER button to<br />
continue.<br />
4. Start and warm-up engine to normal operating temperature. Press<br />
the ENTER button to continue.<br />
OBD2&1 75
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