Coil Resistance Range

[Uwon]

Just changing the spark plugs on my '06 C2S so I thought that I should also check the resistance on the coils which are only 3 years old with about 30K miles. Searched the forum but can't find any info on the acceptable range. The Bentley manual does not have any info either. Would appreciate help on this.

Thanks in advance.

Cheers,

Johan

[Loren]

Resistance between terminals 1 and 15 at 20 °C: 0.3 - 0.7 Ω

[Uwon]

Hmm..... I presume that terminals 1 and 15 are the outer pins in the three prong plug receptacle. Right? All my coils measure .1-.2 ohms at about 24 degrees Celsius. Don't know what the effect is as a result of the temperature change. Also, my ohm meter may have a slight permanent offset. Thought?

Thanks in advance.

Johan

[Loren]

If the car has the newer style coils then they will be labeled A1 and A3

If they are the older style they will still be labeled  1 and 15

[Uwon]

OK, got the high powered magnifying glass and found the 1 and 15 labels. Any thoughts on the ohm readings at 24 degrees? On second thought, I'll put one in the fridge and report.

Johan

Edited August 18, 2015 by Uwon

[Uwon]

Pulled out my old ohm meter which turned out to be more accurate.than the new one. Coils read .4 and it made little difference in readings after being in the fridge for an hour and freezer an hour after that.

Thanks for your help, Loren.

Cheers,

Johan