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9: FUNCTIONAL TESTS
“Functional Tests” gives the operator the possibility to activate components of the
engine management system, such as Actuator Tests, Wiggle Tests, Output State
Tests, etc. The n u m b e r o f tests depends on the p r i m a r y c a r t r i d g e , some examples
are listed below:
REVIEW ECU ID
Information concerning the ECU is displayed in this test. Select “Functional Tests”
from the “Main Menu” and press Y. Select “Review ECU ID” and press Y. The
Scanner displays the identification data of the ECU under test. Press Y again to
return to the “Functional Tests” menu.
ACTUATOR TESTS
Which actuators can be activated is dependant on the ECU under test and the
vehicle itself. For example:
• Injectors
• Idle Air Stepper Motor
• Air Conditioner Relay
The Scanner commands the ECU to activate a component. But it doesn’t check
whether the component is actually operating correctly. In most cases the effect
can be clearly heard; a relay clicks or a pump runs. Be aware, actuators can be
mounted anywhere within the vehicle, e.g. under the dashboard, under the bonnet
and even in the boot. If no reaction can be heard at all, measure the actuator with
an Oscilloscope or a Multimeter, this will indicate whether the ECU is controlling
the component properly or not.
NOTE: Often a certain actuator may not be present on a vehicle, although
according to the manuals it should be. Please check this first
after failing to hear a reaction from the actuator under test. Have
the engine running only when instructed to do so by the Scanner.
IGNITION ADJUST
Use this test to increase or decrease the ignition correction. Select “End” and
press Y to exit this test.
FUEL ADJUST
Use this test to increase or decrease the CO correction. The engine must be
running to perform this test. (The values displayed are dependant on the MAP
sensor and the ECU). Select “End” and press Y to exit this test.
NOTE: For both the Ignition and the Fuel Adjustments, the maximum and
minimum adjustment values are dependant on the ECU type.
OPERATION
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