Can you help?
Can you help?
(OP)
This will probably sound like a very stupid question but I am a recruitment consultant working within the automotive industry and I am trying to get my head around the difference between on board and off board diagnostics within powertrain. Can any body explain this to me in a simple way?





RE: Can you help?
From what you're asking, "off-board diagnostics" seems like what we refer to as "no code diagnostics". The engine is just not running right, but the computer does not detect a fault. A perfect example of this can be found on Ford's 4.6l V-8's. The throttle body has a tendency to get dirty, resulting in a rough idle, hard starting, and stalling at times. The computer will rarely determine a problem. No-code diagnostics can be time consuming and aggravating. When the computer can supply a trouble code, it may not tell you the exact problem, but it's usually a good place to start. Without a code indicating the proximate cause, it becomes a matter of checking the basic engine functions which aren't generally monitored directly, i.e. compression, fuel pressure, etc.
RE: Can you help?
Just guessing
Cheers
Greg Locock