OBD1 fault finding (1 Viewer)

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Joined
Jan 6, 2023
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Location
Western Australia
I have an 80 Series, OBD1 and the ECL illumintes occasionally after a few minutes driving (not every time I drive), however, when the engine is shut down and restarted, the CEL is off. Sometimes shutting the engine down and restarting it will clear the CEL and it wont illuminate again on that drive.
I have done the diagnosis port check for fault codes but none have been recorded.
I have researched but cannot find any way to diagnose a CEL fault while the engine is running and the CEL illuminated.
Is anyone familiar with a similar situation that can share information on how to troubleshoot this problem?
 
I've been able to pull codes with the engine running, fwiw
 
not sure if it works on AUS rigs but the toyocom obd1 scanners work great on US spec rigs and will let you pull data while the truck is running.
 

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