Models Covered - Astra - Belmont
- Carlton - Cavalier - Opel - Tigra - Vectra
Vauxhall ECO TEC 1.6 Lt. Multec
The double ended coil in this particular case, differs from many
other systems as it has the ignition amplifier built into the coil
pack. The coil/amplifier pack will have 4 electrical connections.
The pack receives a 12 volt supply from the ignition switch, has
an independent earth return and the remaining two connections are
in the form of a 5 volt 'squarewave' digital signal from the Electronic
Control Module (ECM).
The ECM will receive information from the engines sensors and calculates
the point of ignition by the ECM from its internal pre-set parameter.
At the designated point, the 5 volt supply drops to zero volts,
signaling the amplifier to remove the earth path on the coil primary,
firing the coil.
The coil/amplifier pack has two separate sides (one for cylinders
1 + 4 and the other for cylinders 2 + 3). Using an oscilloscope
with dual trace both circuits can be monitored and it can be seen
that the coils are fired alternately, as the example shows.
Parallel measurement is one of the ways in which we do measure vehicle
electronics. This way of measurement gives you the values going
into and out from the ECU*.
All the values are displayed in real time.
The connection to the car is fitted between the ECU and the ECU
harness using one of our cable adaptors
The Parallel way of measuring is in many cases the only way to
measure on cars from the time before OBD. But even on cars with
OBD the Parallel measure is of a great value when it comes to the
exact localisation of a fault.
*ECU = Electronic Control Unit
Serial measurement is the most common way to perform tests on
vehicle electronics. In modern cars a standard connector can be
found. From this connector we read the cars diagnostic system codes
and data’s. This diagnostic system is called OBD (On Board
By this technology it is in most cases also possible to activate
components, turn off service lamps, erase fault codes. test airbag
components, re-program immobiliser units,keys, and read Data.
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