Scan Tool Diagnostics

These days none of the workshops can perform all work without a scan tool, its an expensive piece of equipment but on late model cars such as BMW, Merc, VW and Audi when electrical fault occurs, you can not do anything without scan tool, it became a must have equipment for workshops. Late model cars comes with a lot of electrical equipment which can only be diagnosed with proper scan tool, other wise mechanic would be guessing whats wrong with car, but this guess can cost a lot for customer.
We used Hanatech scan tools at Unitec to read and clear fault codes, read life data stream from sensors and actuators input and outputs.

Here is a life data from Ario's 1995 Honda Civic. The car running closed loop as we can see oxygen sensor working.



We scan the car for trouble codes and there is no faults in a system. So we disconnected MAP and TPS sensors, then scan the car once again and scan tool came up with two fault codes, MAP and TPS no signal.

Then we open current data and found that MAP sensor value changed to 0.3 volts and TPS voltage changed to 5.1 volts. We plugged plugs back into the sensors, and then deleted trouble codes. After scanning car once again no fault codes came up on a screen. So with the help of scan tool, which can point up towards fault direction we can fix cars faster and easier. Scan tool is an expensive piece of equipment, which can point onto faults, but it wont fix faults, as some technicians think.