Help Using Volt-Ohm Meter

[parimento1]

I was checking the coils on my 97 Avalon today with a digital volt-ohm meter, and I checked two coils and the resistantce was 122.8 for both coils, warm. How can this be posible. The coil resistance listed as per Toyota's manual is from .68-.980 ohms. I do not think I am reading this meter correctly. It is a regular radio shack meter, I set the dial to ohms and hooked them up...I have no idea what the problem could be. I was doing all this to day to investigate the P1300 DTC.

 

[Quest]

122.8ohms section is your primary (HV side), 0.68~0.98ohms section is your secondary side where spark plugs connect.

Check the readings again.

Q.

 

[parimento1]

It says that .68 to .980 is the "primary coil resistance (hot)" The system I have is a waste-spark system if that makes any difference to you guys. I checked the primary coil it has the big electronic box on the coil.

 

[Quest]

Originally Posted By: parimento1
It says that .68 to .980 is the "primary coil resistance (hot)" The system I have is a waste-spark system if that makes any difference to you guys. I checked the primary coil it has the big electronic box on the coil.


Sorry, you are right (I was out of caffine all day).

you are correct (what was I thinking., sheesh!). 0.68~0.98ohms should be primary section (12V end), and the higher ohms section (122ohms yours read?) is where the spark plug connects.

Q.

 

[onion]

Yep. The lower resistance will be on the 12V powered side of the coil. The high voltage side will have a MUCH higher resistance.

 

[parimento1]

The coils checked out fine...I wonder whats with the CEL. I pulled a few plugs, they look BRAND NEW they are double platinum NGKs with 90k miles on them, I think they will probably out last the car. Anyway, coils and plugs look good, igniter is very new..I wonder whats causing this?

 

[onion]

http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=943612

 

[parimento1]

Last time this CEL came on (~2 years ago) I replaced the ignitor with no success.

 

[Quest]

what was the code?

 

[parimento1]

P1300

 

[ATS-V]

What type of car?

 

[parimento1]

97 Avalon