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Automotive Engineering: Powertrain, Chassis System and Vehicle Body
In certain automobile models, the instrumentation computer can perform the important function of diagnosis of
the electronic engine control system. This diagnosis takes place at several different levels. One level is used during manufacturing to test the system, and another level is used by mechanics or interested car owners to diagnose engine control system problems. Some levels operate continuously and others are available only on request from an external device that is connected to the car data link for diagnostic purposes by a technician.
In the continuous monitor mode, the diagnosis takes place under computer control. The computer activates
connections to the vehicle sensors and looks for an openor short-circuited sensor. If such a condition is detected, a failure warning message is given to the driver on the alphanumeric display or by turning on a labeled warning light.
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