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Ask Jay Your Own Question
Jay, Certified Infiniti Technician
Category: Infiniti
Satisfied Customers: 3818
Experience:  20+years, Nissan and Infiniti experience and currently now working for a Infiniti Dealer
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I got t code P1320, The exact code is P1320 ignition signal

Customer Question

i got t code P1320
JA: Just to clarify, what's the exact code? And have you tried to reset it?
Customer: The exact code is P1320 ignition signal primary
JA: What is the model/year of your Infiniti?
Customer: 2001 infiniti QX4
JA: Are you fixing your QX4 yourself? What have you tried so far?
Customer: yes i ran the code detector on it now am looking for the best solution to fix it
JA: Anything else you want the mechanic to know before I connect you?
Customer: nope
Submitted: 9 months ago.
Category: Infiniti
Expert:  david craig replied 9 months ago.

Hi Im David, thanks for visiting the site. allow me a moment to look up some info for you, thanks

Customer: replied 9 months ago.
Hello DavidThanks
Expert:  david craig replied 9 months ago.

Possible causes - Faulty power transistor unit built into ignition coil - Ignition primary circuit is open or shorted (circuit to ignition coils) - Ignition primary circuit poor electrical connection (circuit to ignition coils) - Faulty ignition system condenser - Crankshaft position sensor circuit

The most common cause that will trigger the P1320 code is the ignition coils, one or more ignition coils may have failed. Even tough the coils may be working OK, the resistance for one or more of the coils is greater or smaller that what the Engine Control Module (ECM) is expecting. Measuring the resistance with the coil out of the vehicle may not show any failures, usually the coil fails under heavy conditions (hard acceleration) or certain temperatures. The P1320 code means that there is problem with the "Ignition Coil" or the wire to the ignition coil. For some models without individual ignition coils the Ignition Coil is inside the distributor and the distributor need to be replaced to fix the problem.
The ignition signal from the Engine Control Module (ECM) is sent to and amplified by the power transistor. The power transistor turns on and off the ignition coil primary circuit. This on-off operation induces the proper high voltage in the coil secondary circuit.

Expert:  david craig replied 9 months ago.

you can test each coil to see if its reading the correct amount of resistance. somewhere between 5-8 ohms. if one doesnt read anything then that coil is bad. you can also test for 12vdc at each coils connector to make sure its not a wiring issue.

Customer: replied 9 months ago.
OK Because i just purchase new coils and replace all 6 of them and problem still is occurring
Customer: replied 9 months ago.
the new coils is defective as well?
Expert:  david craig replied 9 months ago.

did you replace them with coils from the dealer or were they aftermarket?

Customer: replied 9 months ago.
OEM parts order then from rock auto so i think they were originals
Expert:  david craig replied 9 months ago.

no, they are aftermarket. they will not fix your vehicle. they are junk

Expert:  david craig replied 9 months ago.

instead of replacing all of the coils. find out which one is the problem the way i described above.

Customer: replied 9 months ago.
do you have any site in which you can refer me to?
Expert:  david craig replied 9 months ago.

im not going to refer you to any site until we find out which coil is bad.

Expert:  david craig replied 9 months ago.

and when we do find out which one. you will need to go to your local dealer and purchase the part

Expert:  david craig replied 9 months ago.

i dont throw parts at vehicles. i find the root cause of the problem

Customer: replied 9 months ago.
Thanks David. ill locate the coil problem and get back to you
Expert:  david craig replied 9 months ago.

no problem

Expert:  david craig replied 9 months ago.

hows it going?