bjbj The E C M grounds inputs, as simple as they may sound, are 90% of the times overlooked
by technicians. The E C M grounds are, in the majority of the times, independently connected
to the E C M. Here in this diagram, we take the example of the O2 sensor. As you can see,
the O2 sensor is connected to the E C M microprocessor inputs on one side, and to the ground on the
other. However, it is connected to only one ground. It is often the case, where the O2
sensor generates a fault, it is replaced and to no avail. The D T C or faulty code keeps
coming back. In this case, check the E C M ground that feeds this O2 sensor. A breakage
at this ground, whether inside or outside the E C M will cause the issue above. Modern
E C M grounds are independently connected due to the differences in current draw and
to prevent E M F or interference at the different circuits. It is for this reason that e fault
at one specific ground will keep the engine running, but will generate difficult to diagnose
codes at one specific system. The E C M grounds inputs, as simple as they may sound, are 90%
of the times overlooked by technicians Mandy Concepcion Normal.dot Mandy Concepcion Microsoft
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