99 max is throwing a 1320 and knock sensor, I changed the plugs and coils. Stealership has no clue they want to replace the ignition wires. No driveability issues, but can't get a inspection. Has anyone resolved this problem.

 

You can't clear it, or you can't resolve whatever problem is causing the code? Two completely different scenarios.

They want to replace that harness? You can't really replace the harnesses to the coils without opening up the entire engine harness, or just running new wires into the cabin.

Have you checked continuity on the harness to the coils? Checked the CKPS REF and its harness?

 

I can't clear the issue that is causing the code. Dealer stated issue would be coils and plugs, I replaced them to no resolve. Now they want to do the harness. Tech Sheets call for them above listed repairs to clear PO1320. This is only a 99 issue, so what is defective about 99 only that cause the 1320 code.

 

Have you done what I suggested above? That'll tell you whether or not you need to repair/replace the harness.

The TSB for P1320 relies on either ignition coils, or the wire harness TSB that applies to all 4th gens. It can fail where it passes by the right strut tower.

And it's P1320, not PO1320.

 

Have you checked continuity on the harness to the coils? Checked the CKPS REF and its harness?
I have no idea how to do what you requested.

 

if you didnt fix it by changing the coils like pmohr said check continuity from the ecm to each coil connector read the service bulletin theres no need to replace the harness just repair.
good luck

 

Use a multimeter, check continuity between the signal wire on each coil connector and the corresponding pin on the ECU.

For the CKPS REF, details are in the FSM.

 

For the CKPS REF, details are in the FSM. Please plainly translate.

 

...that was plain.

If you're going to reply to a post, quote it, don't just copy and paste text. That just makes following the conversation confusing.

Details for testing the CKPS REF (Crank position sensor under the crank pulley) are all in the FSM, under P1335 (EC-422 for a '99).

 

CKPS REF - Crankshaft position sensor, reference. There are two crankshaft position sensors, REF and POS. The REF sensor is located right beside the oil filter. Follow the wires from the sensor to the harness connector.

FSM - Factory service manual. Available as a collection of .pdf files online. The one you want is EC.pdf. Each diagnostic code has its own procedure, covered in the manual. Usually check voltage or resistance at the sensor, then check continuity between the sensor and the ECM (engine control module).

A dealership that "has no clue" and won't follow the diagnostic procedure (they have a system called CONSULT that makes it easier for them) is no good. Take the car somewhere else.

 

having the same problem got the code p1320. i replaced the ignition switch, spark plugs,coil(bank 4), crank sensor(REF) reset the code but came back on. drove more than almost 100 miles after replace all these parts but the code won't go away. my inspection expired and got a ticket today need to fix this problem ASAP please help!!!!!

 

How'd you know to replace the coil in cylinder #4?

One remaining part the FSM says to check for a P1320 is the ignition circuit condenser. The condenser is a $5 part. It's taped to the front right corner of the wiring harness, while standing at the front of the car looking at the engine. It has a bright red wire coming out of it. The FSM says you should measure a resistance of > 1 M-ohm between the two terminals of the condenser. Seems like if the condenser was bad, the car wouldn't even start, so I don't know - maybe a red herring.

Take a look at this post: http://forums.maxima.org/4th-generat...de-1320-a.html

 

there was a code pop up before this code so i replaced. i don't remember the code but its #4.

 

Did you check the wiring harness?

 

where is the wiring harness and how to check what to look for? i'm a newbie

 

The wiring harness is the massive...harness of wiring. All of the wires from connectors in the engine bay back to the ECU, that's the wiring harness.

You check continuity between the coil connectors and the ECU.

Details are in the FSM under EC, P1320.

 

i will check the FSM see what to do. you helped me alot.THANK YOU!!!

 

I know this is an older thread, but I just started having this issue. I had a p0306 come up (with a p0325) so I swaped #6 and #2, which of course resulted in a p0302 & p0325 (which is what I expected) Had a freind test the coil and it was bad. I just replaced the coil with a used one and I am not getting the misfire or knock sensor code anymore, but now I'm getting the p1320, which I didn't have before. I am waiting for my friend to come by (I don't have a meter) so I wanted to get as much info as possible before he comes.
The car starts better than it did before the coil swap and it runs better, so I think the coil is good.
Any help would be great.

 

Ok, it seems the coil I got works, but not 100%. It provides spark, which is more than the dead coil did, but the spark isn't right. When tested, the resistance isn't what it should be. Thats what I get for getting a coil off Ebay. Gonna try one from a junk yard I guess, too cheap to spring for a new one.