Scan Tool Diagnostics
Using a scan tool on a Honda Accord I recorded the follow live data.
Engine RPM = 770
Throttle Angle = 9.4 - 9.8
Engine Coolant Temp = 78 degrees C
Intake Air Temp = 25 degrees C
Fuel Inj opening pulse = 2.35 ms
Transmission select position = P/N
Vehicle Speed = 0 Km/H
Oxygen Sensor = .55 v
Air conditioning = OFF
Exhaust Gas Recirculation = 1.27 v
Fuel Evap = Off
Malfunction Indicator Light = Off
Live data is very important and if you know what the components readings should be then it can help you find faults in the engine.
Using the scan tool, I tested for any trouble codes and found none. To test me, my lecturer created a fault and the hood. So i tested for any trouble codes with the scan tool and found code 12 (MAF). Looking at the engine i found the MAF sensor and fixed the fault by plugging it back in. I then cleared the codes and tested again. No fault codes.
Scan tools are a big help in finding faults in a engine, but they don't fix the problem. We still need to do other tests as well such as back-probing and volt drop test do fully understand whats going on.
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