Originally Posted by
oldford
The fault code P0103 is normally set when the voltage on the signal line is very high.
Depending on the actual system this is usually around 4.5 or 4.6 volts.
That kind of voltage normally cannot be reached when the enige is idling.
So, you're probably looking at some wiring fault or a defective ecu.
The plug for the maf sounds suspicious and is a good place to start investigating.
Oldford, cheers for the input so far - much appreciated.
Stuck a multi-meter on the battery last night and running at between 12v - 12.5v within engine off, when engine idling it was running @ 13.8v - 14.1v, looks normal to me? What do you think?
Interestingly, I pulled the MAF plug when engine was idling and started to "hunt" quite violently, it stopped immediately and engine was rescued from stalling, engine began to compensate from lack of air flow measurement and ticked over @ a higher rate but no more "hunting".
How do I go about testing power input to MAF plug? I can't probe the back of connectors as I'm guessing that could damage rubber cable bungs, right? I don't have a wire-piercing probe so would I make a small incision in the wire and test, then cover with electrical tape?
Cheers.