Quote:
Originally Posted by 3554me
.....tps as soon as i work out how to check it , i have a multimeter but lack any knowledge
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With the key switched on you should have 0 to 0.9v at closed throttle, and 4.9v at wide open throttle.
Black with yellow stripe is earth (Via ECM).
Grey is 5volt supply (from ECM).
Blue is the wire that should have the above mentioned volts (signal to the ECM).
You measure the voltage between black/yellow wire and the blue. You can also check the black/yellow to a good earth. A major variation would indicate a poor earth somewhere.
EFI systems develop all types of problems with bad earths.