Equus 3145 - Digital Ford Code Reader (1981 - 1995) - Manual (Page 44)

Retrieving Codes
ADDITIONAL TESTS FOR EEC-IV SYSTEMS
41 Chapter 4
Cylinder Balance Test Procedure
• Always observe safety precautions before and during
testing process.
• ALWAYS check Code Reader battery before retrieving
fault codes.
• The vehicle must pass the KOEO test before performing
this test.
1. Turn ignition off.
2. Turn the Code Reader off (press the ON/OFF button, as
necessary), then connect the Code Reader to the vehicle's
test connectors.
■ Both the large and small connectors must be
connected.
3. Turn the ignition on and start the engine.
4. Press and release the TEST/HOLD button to put the
Code Reader in test mode. The vehicle's computer will
perform a Key On Engine Running Self test.
■ A square icon (on the right-hand side of the screen)
displays and flashes each time the Code Reader
receives a code. The code is then shown on the Code
Reader's display.
NOTE: Each code is repeated twice
5. Wait until all the codes are sent (the flashing square icon
no longer appears), then, without disconnecting or turning
Code Reader or the engine off, proceed to step 6.
NOTE: Do not concern yourself with the KOER test results
or any KOER fault codes received at this time. The purpose
of briefly performing the KOER test is to put the computer
into the "Cylinder Balance Test Mode"; this mode will
allow the user to determine if all the cylinders are
contributing equally to vehicle operation.
6. After all the KOER codes have been received by the Code
Reader, lightly press the accelerator, about one quarter of
the way down, then release.
■ For 1986 models ONLY: Fully press accelerator
once and release.
4