P Am Ge Ripp

5ms/QIV _E MgiMd

Fig. 7.2(b) Charging system voltage tests

Fig. 7.2(b) Charging system voltage tests correctly, this source voltage must be accurate within certain limits. This requires careful voltage measurement. Figure 7.3 shows a backprobe test to check source voltage. In this case the Bosch PMS 100 scope is being used. The reading obtained is shown as 5.09 V.

In all of the above tests it is important to ensure that good quality leads and clips, or probes are used. It is essential that 100% effective electrical connections are made between the test leads and the electrical connections that are being tested. If this is not achieved, a great deal of time and effort can be lost because of false readings.

Fig. 7.3 Checking source voltage

7.2 Vehicle specific details

Those readers with experience of working on different makes of vehicles will know that the range of differences that are to be found within computer controlled systems makes it virtually impossible to cover all different systems in one volume. Changes in computing technology and electronics occur frequently and this means that the design of computer controlled systems on vehicles also changes quite frequently as new designs incorporate the new technology. This means that data and information is frequently updated and it is a major task to keep abreast of these changes. Technicians in franchised dealerships are normally notified of changes and, with modern technology, this updating can be done rapidly. In the case of the general garage workshop, technicians will probably have to rely on data and information from specialized companies. An updating and information back-up service is offered by companies such as Robert Bosch Ltd and Lucas Aftermarket Operations etc. Whatever the case, it is essential that the information that relates exactly to the system that is being worked on should be readily to hand and that all procedures are properly understood before work commences.

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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