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Infiniti I30/I35 Similar to a Maxima, yet not really a Maxima. Discussion forum on Nissan's luxury model, the Infiniti I30/I35

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Old 12-10-2004, 08:21 PM   #1
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Where to test ignition coils with ohm meter

This come with a long pre-story but I wont bore you with it, I just need to know how exactly I go about testing the coils with an OHM meter to see which is the bad one.
Here is a pick to help out with possible descriptions.
Click the image to open in full size.
Also if you know of another way to test which is the bad coil that would help, I was told one way is to start the car and remove one and see if the car sounds worse, if its no dif then thatís the bad oneÖ the problem is I am not going to be able to do the work I have to tell a friend how to do it (out of town) but they are not very mechanically savvy, on and off tests he can do for me but he says he wont do the test while the car is on.

-aPeG
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Old 12-10-2004, 08:48 PM   #2
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For the second method, all you have to do is unplug the coil pack. It's right there, just reach over and unplug it.
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Old 12-16-2004, 03:10 PM   #3
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I'm about to do this too to my 99 I30, as I'm starting my winterbreak from college. Anymore help anyone? For the second method, how much "worse" can it sound. Will it be noticeably different, or would I have to try multiple times to notice the difference. Is this method more advisable than the OHM meter thing? Much thanks.
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Old 12-16-2004, 03:47 PM   #4
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Quote:
Originally Posted by apeg
This come with a long pre-story but I wont bore you with it, I just need to know how exactly I go about testing the coils with an OHM meter to see which is the bad one.
Here is a pick to help out with possible descriptions.
Also if you know of another way to test which is the bad coil that would help, I was told one way is to start the car and remove one and see if the car sounds worse, if its no dif then thatís the bad oneÖ the problem is I am not going to be able to do the work I have to tell a friend how to do it (out of town) but they are not very mechanically savvy, on and off tests he can do for me but he says he wont do the test while the car is on.

-aPeG
I was wondering what car is in the picture and from the VIN I see that it is a 2000 I30 and therefore has black intake Mine is silver...

In order to test the coil, take it out. Measure the resistance in the following manner:

POS to 1 and NEG to 2 -- should show infinite resistance
POS to 2 and NEG to 1 -- should show continuity but not zero ohms
POS to spark plug and NEG to 1 -- should show infinite resistance
POS to 1 and NEG to spark plug -- should show infinite resistance

Connector number 3 is a trigger and is not measurable.

Connector:

___|--|___
| 3 | 2| 1 |
-----------

If any coil shows otherwise than it sould be replaced.

If I remeber correctly, the resistance between pin 1 and 2 was about 16- 21 ohms on my 96' but dont quote me on that. I did it long time ago.

Hope it helps.

regards, Bart.
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Old 12-16-2004, 03:49 PM   #5
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Quote:
Originally Posted by lawrencel715
I'm about to do this too to my 99 I30, as I'm starting my winterbreak from college. Anymore help anyone? For the second method, how much "worse" can it sound. Will it be noticeably different, or would I have to try multiple times to notice the difference. Is this method more advisable than the OHM meter thing? Much thanks.
When Youll remove the connector the engine will shake a lot. Trust me, you will notice the difference.

regards, Bart.

ps: why do you guys want to test the coils?
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Old 12-16-2004, 06:32 PM   #6
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i have a bad coil i think. when at drive and stopped, it shakes spontaneously. I think it happens on neutral as well, i don't remember. sometimes it happens sometimes it doesn't, so i'm weary whether taking each ignition coil off then starting the car would work. I'm thinking the ohm reader would work better. i've been told on this board, as well as a dealership that it's most likely a ignition coil gone bad, since 99 maximas/i30s tend to have that problem.

anyone know a site where i can buy 1 cheap ignition coil if i determine which one is bad? the front and rear coils are different, so i'm not sure which one to get yet, but will know after i have a friend test it for me.
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Old 12-16-2004, 06:40 PM   #7
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Quote:
Originally Posted by lawrencel715
anyone know a site where i can buy 1 cheap ignition coil if i determine which one is bad? the front and rear coils are different, so i'm not sure which one to get yet, but will know after i have a friend test it for me.
I went to my local infiniti dealership and bought two for $75ea if I remember correctly. Funny tho because my coils were ok. When I was measuring them, two had slightly higher resistance..... I thought that would make them bad... but I was wrong I still dont know what should be the exact resistance, probably anything over 500ohms is bad... I just dont know..

regards, Bart.
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Old 12-16-2004, 06:45 PM   #8
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Originally Posted by lawrencel715
when at drive and stopped, it shakes spontaneously. I think it happens on neutral as well,
Did you try to clean the intake throttle? My I30 had problems starting and rogh idle. After I cleaned the throttle, everything went away! Try it, see my post at:

http://forums.maxima.org/showthread....40#post3487440

regards, Bart.
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Old 12-16-2004, 07:01 PM   #9
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yea that's been done with the right cleaner already.
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Old 12-18-2004, 04:58 PM   #10
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Some simple direction?

Click the image to open in full size.

How to get the green clips to unplug? In the picture you see the green clips which I assume are the connection to the ignition coils, I need to get those off to do the tests on the coils but am having very little luck? I tried to a pair of pliers but I donít want to go too hard because they are just plastic clips and I may break them.
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Old 01-10-2005, 10:39 PM   #11
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Well after all this time I finally took care of the Ignition coil problem and thought i would post my finding for people who may be is the same situation:

I decided to try the ohm meter test first just because it is easy and I want to see if it will actually work... and IT DID ;-)

Now i forget which direction I was holding the coil @ the time of testing but you should get the idea, ohh and thanx to SKORPiO for the method but just to play it safe i did all combinations:
--------------------------------------------------------------------------
Results front 3 coils (looking @ the front of the car) left to right, i__ = infinity or 0
_________Coils
Pins._| #1 | #2 | #3 |
-2,+3 |06.5|07.0|06.5|
+2,-3 | i__ | i__ | i__ |
-1,+2 |35.0|35.0|35.0|
-1,+3 |15.0|14.0|12.5|
+1,-2 |12.0|16.0|13.0|

Results back 3 coils (looking @ the front of the car) left to right, i__ = infinity or 0
_________Coils
Pins._| #4 | #5 | #6 |
-2,+3 |06.5|06.0|06.0|
+2,-3 | i__ | i__ | i__ |
-1,+2 | i__ |32.0|30.0|
-1,+3 | i__ |12.0|12.0|
+1,-2 | i__ |250.|13.0|
--------------------------------------------------------------------------
Without a doubt coil #4 is the dead one, reporting "i" results when the rest were all uniform, I have order the new coil and it will be here tomorrow. Coil #5 is the one that worries me, as you can see it reports values just like all the others EXCEPT for (+1,-2) I tested it 5x and came up with 250-300, which is WAY off. So currently the plan is to replace #4 then resent to ECU and see if the light comes back because of #5.

Hope this helps you guys out

-aPeG
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Old 02-04-2011, 12:13 PM   #12
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Quote:
Originally Posted by apeg View Post

Now i forget which direction I was holding the coil @ the time of testing but you should get the idea, ohh and thanx to SKORPiO for the method but just to play it safe i did all combinations:
--------------------------------------------------------------------------
Results front 3 coils (looking @ the front of the car) left to right, i__ = infinity or 0
_________Coils
Pins._| #1 | #2 | #3 |
-2,+3 |06.5|07.0|06.5|
+2,-3 | i__ | i__ | i__ |
-1,+2 |35.0|35.0|35.0|
-1,+3 |15.0|14.0|12.5|
+1,-2 |12.0|16.0|13.0|

Results back 3 coils (looking @ the front of the car) left to right, i__ = infinity or 0
_________Coils
Pins._| #4 | #5 | #6 |
-2,+3 |06.5|06.0|06.0|
+2,-3 | i__ | i__ | i__ |
-1,+2 | i__ |32.0|30.0|
-1,+3 | i__ |12.0|12.0|
+1,-2 | i__ |250.|13.0|
--------------------------------------------------------------------------
Without a doubt coil #4 is the dead one, reporting "i" results when the rest were all uniform, I have order the new coil and it will be here tomorrow. Coil #5 is the one that worries me, as you can see it reports values just like all the others EXCEPT for (+1,-2) I tested it 5x and came up with 250-300, which is WAY off. So currently the plan is to replace #4 then resent to ECU and see if the light comes back because of #5.

Hope this helps you guys out

-aPeG

To be sure to understand,

you apply + battery 12 V on the pin 2
and you apply the negative - battery 12 V on the pin 1

after you read with ohm meter the resistance between the pin 2 and pin 1 ?


we must read between on ohm meter: between 15 and 36 ohm ?


thanks
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Old 02-04-2011, 12:25 PM   #13
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Hey Dan, its been a chunk of years since i made this post... but heres what i can remember:

each coil has 3 pins, i want to test all permutation for those 3 pins (1-2)(1-3)(2-3). but there is also - + from the ohm meter, so that gives (-2,+3)(+2,-3)(-1,+2)(-1,+3)(+1,-2)

from there just graph all your results and the odd ball out will be your bad coil. good luck.

-aPeg
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Old 02-04-2011, 01:40 PM   #14
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Quote:
Originally Posted by apeg View Post
Hey Dan, its been a chunk of years since i made this post... but heres what i can remember:

each coil has 3 pins, i want to test all permutation for those 3 pins (1-2)(1-3)(2-3). but there is also - + from the ohm meter, so that gives (-2,+3)(+2,-3)(-1,+2)(-1,+3)(+1,-2)

from there just graph all your results and the odd ball out will be your bad coil. good luck.

-aPeg
Hi aPeg,

I have Maxima 95

To test:

Turn on your ohmmeter and place the positive wire on the 1st prong in the electrical plug of the coil pack. The negative wire should be touching the middle prong. Verification of the ohmmeter at this time should say infinite...

if it's anything else, the pack should be changed. Next test: reverse the wires... positive on the middle prong and negative on the 1st prong.... on a new coil pack, value of approximately 1.1-1.2 mega ohms for all coils

i do not have your values with ohm meter like: +1,-2 |12.0|16.0|13.0| ohms

thanks
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Old 02-09-2011, 04:04 PM   #15
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On my Maxima 95

With Ohm meter

Results front 3 coils (looking @ the front of the car) left to right, i__ = infinity

K: Kilo
M: Mega
_________Coils
Pins._| #1 | #2 | #3 |
-2,+3 |1.45K ohm | 1.61K ohm | 1.81K ohm |
+2,-3 |1.45K ohm | 1.61K ohm | 1.81K ohm |
-1,+2 |1.16M ohm | 1.11M ohm | 1.07M ohm |
-1,+3 |1.16M ohm | 1.11M ohm | 1.07M ohm |
+1,-2 | i | i | i |

Last edited by Dan177; 02-09-2011 at 04:08 PM..
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Old 02-09-2011, 04:07 PM   #16
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On my Maxima 95

With Ohm meter

Results back 3 coils (looking @ the front of the car) left to right, i__ = infinity

K: Kilo
M: Mega
_________Coils
Pins._| #4 | #5 | #6 |
-2,+3 |1.52K ohm | 1.49K ohm | 1.71K ohm |
+2,-3 |1.52K ohm | 1.49K ohm | 1.71K ohm |
-1,+2 |1.16M ohm | 1.18M ohm | 1.10M ohm |
-1,+3 |1.16M ohm | 1.18M ohm | 1.10M ohm |
+1,-2 | i | i | i |

Last edited by Dan177; 02-09-2011 at 04:15 PM..
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Old 02-09-2011, 04:14 PM   #17
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Problem with my Nissan Maxima 95 when we have humidity.

When he starts the morning, if we have humidity, he starts, but RPM not to keep 700 tr/min and will go down (stall)
i need to give a little bit gaz to keep RPM above 700 RPM for 1 sec and it's OK

No problem when it's cold (-15 celsius) and no problem when it's dry or beautiful, the Nissan Maxima starts very good
i have only this problem when we have humidity

No engine code about that

May be a coil cracked ? or Mass Air Flow ?

I have other Coil ignition to make a test

thanks
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Old 06-28-2011, 07:35 PM   #18
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i suspect my ignition coils are bad and i followed the instructions on this thread to test them. the problem is my ohm meter only shows any reaction at connections -1, +2 or +1, -2. all others it doesn't even seem to register.
it shows results ranging from 1.3k to 1.5k. somehow i feel like im doing this wrong..
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Old 01-02-2012, 08:29 AM   #19
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Quote:
Originally Posted by nadleeh View Post
i suspect my ignition coils are bad and i followed the instructions on this thread to test them. the problem is my ohm meter only shows any reaction at connections -1, +2 or +1, -2. all others it doesn't even seem to register.
it shows results ranging from 1.3k to 1.5k. somehow i feel like im doing this wrong..
I get the same results as you. I am testing with coil packs out of the engine. It shouldn't matter whether the coil is in the car or not, since the coil only contacts the plug electrode and does not have a ground connection when unplugged, but perhaps it still conducts in the MOhm range through the plastic case?
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Old 01-02-2012, 08:29 AM
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