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Most
modern vehicles have a computer or ECU
(Electronic Control Unit) that controls engine operation.
The ECU relies on the sensors on your car to make it run
at its optimum performance at all times to meet with today's strictest
emission regulations. When a sensors goes wrong or there is a fault
with the engine, the ECU sees this problem and logs the fault code within
it's memory ( not all problems are logged, depends on what system your
car is using).
Often the ECU warning light on the dash board may light up, indicating
to you that there is a problem but not always the case.
The engine needs to be constantly and precisely adjusted according to
various conditions such as speed, load, engine temperature, fuel quality,
ambient air temperature which are all controlled by sensors sending
a signal to ECU.
According to these inputs, the ECU makes initial adjustments to fuel,
ignition timing, idle speed, ect also the primary oxygen sensor installed
in the exhaust before the catalytic converter that monitors the quality
of combustion in the cylinders. Based on the feedback from this oxygen
sensor the ECU makes fine adjustment to the air-fuel mixture to further
reduce emissions.
Besides that there are few additional emission control related vehicle
systems. For example, there is an Evaporative system (EVAP), designed
to prevent fuel vapors from the fuel tank from being released into the
atmosphere. It also contains a number of sensors and actuators controlled
by the ECU.
The ECU has self-diagnostic capability and constantly tests the operation
of sensors and other components. When any of the sensor signals is missing
or out of normal range, the ECU sets a fault and illuminates the "Check
Engine" also called MIL (Malfunction Indication Light) storing
the corresponding Diagnostic Trouble Code (DTC) in the ECU memory.
The same will happen if a mechanical component of the controlled system
fails. For example, if the EGR valve fails, this will also cause the
"check engine" light to come on.The stored trouble code can
be retrieved with a special diagnostic tool. The code itself does not
tell exactly which part to replace; it only gives a direction where
to look for. It is then up to the mechanic to use his experience to
correctly identifying and replace the faulty item.
We are able to fault find systems
such as:
• Engine Management fuel and Ignition
control systems
• Anti lock Braking Systems (ABS)
& Electronic Stability control
• Air conditioning control systems
• Airbag and Seatbelt control systems
• (OEM) Alarm systems
• Key coding (Only certain Vehicles)
• Resetting Service Lights
Please contact us for
any diagnostics, repairs
or DTC reading required.
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We are able to scan many electrical and electronic faults from a comprehensive
range of manufactures list below:
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