OBD | On-board diagnostics | Part 2: OBD light, diagnostic trouble codes
Why does the OBD light go out again?
What do the OBD diagnostic trouble codes mean?
How do you read out the diagnostic trouble codes?
Where is the OBD’s plug connection?
This video gives you the answers.
00:00 Introduction
02:09 OBD diagnostic trouble code (DTC)
03:07 Diagnostic connection
04:13 Operating modes
04:36 Readiness-Code
5:43 The OBD malfunction indicator lamp (MIL)
Monitoring in the vehicle
The OBD monitors all systems and components that are relevant to exhaust gas. Some components are permanently monitored. Other components are only monitored when passing through a driving cycle – e.g. in the case of defined operating conditions, or when certain operating points are reached. Examples of cyclical monitoring include the catalytic converter, the fuel tank ventilation system and the exhaust gas recirculation. Only if a fault occurs in two consecutive driving cycles will the code be saved, causing the error lamp to light up. If the fault does not recur, the lamp will go out automatically after three consecutive cycles. After 40 faultless driving cycles, the diagnostic trouble code will also be deleted from the OBD memory again.
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