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Ford OBD1 Systems<br />
ADDITIONAL TESTS FOR EEC-IV SYSTEMS - RELAY AND SOLENOID TEST<br />
If the computer detects a problem with a cylinder(s) when<br />
performing the initial Cylinder Balance Test, it needs to<br />
repeat the test two more times to properly determine<br />
which cylinder or cylinders are malfunctioning. If this is<br />
the case, the CanOBD2&1 <strong>Scan</strong> <strong>Tool</strong> will display the<br />
“Lightly press the accelerator half way and release”<br />
message again instead of the “System Pass”. Proceed to<br />
step 11.<br />
11. If a cylinder is not contributing at the same level as the other<br />
cylinders, the computer prompts you to repeat the test two more<br />
times by displaying the “Lightly press the accelerator half way and<br />
release” message again. Each time the message displays, perform<br />
the procedures as instructed.<br />
12. After the repeat Cylinder Balance tests<br />
have completed, the computer will<br />
identify which cylinder (or cylinders) are<br />
not contributing equally, and will send<br />
this information to the CanOBD2&1<br />
<strong>Scan</strong> <strong>Tool</strong>’s display.<br />
� If any weak cylinders are identified,<br />
consult the vehicle’s service repair<br />
manual to perform further testing<br />
and/or repairs.<br />
Relay and Solenoid Test (Output State Check)<br />
The "Output State Check" is a special program in the vehicle's computer<br />
that allows the user to energize (turn ON) and de-energize (turn OFF),<br />
on command, most of the actuators (relays and solenoids) that are<br />
controlled by the computer.<br />
Use this test to check computer output voltages and relay/solenoid<br />
operation.<br />
The fuel injectors and fuel pump are not energized during this<br />
test. Check your vehicle thoroughly before performing any test.<br />
See BEFORE YOU BEGIN on page 18 for details.<br />
ALWAYS observe safety precautions whenever working on a<br />
vehicle.<br />
Read and follow Safety Precautions on page 3 before performing<br />
this test.<br />
1. Locate the vehicle's Data Link Connector (DLC). See Data Link<br />
Connector (DLC) on page 77 for connector location.<br />
Some DLCs have a plastic cover that must be removed before<br />
connecting the CanOBD2&1 <strong>Scan</strong> <strong>Tool</strong> cable connector.<br />
CanOBD2&1 91
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