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ENGINE
CONTROL UNIT ( ECU ) ENGINE CONTROL MODULE
( ECM ) FAQS
Q. What is an
engine control unit ( ECU ) or engine
control module
(
ECM )?
The fuel injection system of your car
or truck is controlled by a small unit
called a engine
control unit ( ECU ), it is also
called many different things by different
manufacures, ECM , PCM, FUEL COMPUTER
ECT… Transmission Control Units
are called TCM’s.
Q. What are the
functions of an Engine Control Unit /
Engine Control Module?
The engine
control unit is connected to several sensors and sending units on the
engine and then automatically calculates the optimum amount of fuel
to be injected into the combustion chamber. The benefit is smoother
and faster acceleration, crisp throttle response, maximum fuel
economy thus ensures quick and reliable starting regardless of the
ouside temperature.
Q. How to identify Engine
Control Unit ( ECU ) failure?
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Warning
light REMAINING ON at all times
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Vehicle
breaking down at any time without warning. Breakdown services
diagnose loss of ignition spark.
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Erratic
idle/stall at traffic lights/general poor running and starting
problems which can be intermittent.
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History
of intermittent breakdown - car starts and runs OK but cuts out
when hot. But restarts OK when engine begins to cool down.
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Intermittent
failure to start from cold (but car runs ok once started)
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4
wheel steering check/warning light illuminates continuously and 4
wheel steering does not operate
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loss
of spark on 2 cylinders
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ONE
injector ceasing to function.
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Nonsense
fault codes when code reader is connected or code reader not
communicating with the ECU.
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