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Ford OBD1 Systems<br />
ADDITIONAL TESTS FOR EEC-IV SYSTEMS - CYLINDER BALANCE TEST<br />
5. When prompted, turn off all vehicle<br />
accessories, turn ignition key OFF and<br />
wait for the on screen prompt. If you<br />
wish to exit the Cylinder Balance test at<br />
this time, press the LD/M button.<br />
6. When instructed by the message on the<br />
Tool's display, start the engine and<br />
press the ENTER button.<br />
� A "One moment please preparation<br />
for test is in progress..." message<br />
shows temporarily on the Tool's<br />
LCD display.<br />
7. When prompted by the message on the<br />
Tool's display, lightly press the<br />
accelerator pedal half way and release<br />
to activate the cylinder balance test.<br />
For 1986 models ONLY: Fully<br />
press accelerator once and<br />
release.<br />
� The computer is now in Cylinder<br />
Balance Test mode, and will start<br />
cutting fuel to each cylinder in<br />
sequence to determine if all the<br />
cylinders are contributing equally. It<br />
may take up to five minutes<br />
before the test results are<br />
transmitted to the Tool.<br />
8. If the vehicle's computer fails to enter<br />
Cylinder Balance Test mode, do the<br />
following:<br />
� Lightly press the accelerator pedal<br />
again as described in step 7 above.<br />
9. After the Cylinder Balance Test is<br />
completed, the test results are sent to<br />
the Tool.<br />
� The computer compares the power<br />
contribution that each cylinder<br />
makes to engine operation.<br />
10. If all cylinders are contributing equally,<br />
the computer determines that power<br />
distribution is normal and a “System<br />
Pass” message will display.<br />
76 OBD2&1
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