Help with P0128 Error

Quack? · 05-07-2014, 08:54 AM

Trying to find it online, no luck so far - any chance anyone has pics/manual for the sensor location for the water temp sensor?

SouthArk370Z · 05-07-2014, 08:56 AM

Quote:

Originally Posted by Quack?

Trying to find it online, no luck so far - any chance anyone has pics/manual for the sensor location for the water temp sensor?

Download the FSM. It has all the factory specs and procedures and lots of pretty drawings. Link in my sig.

Quack? · 05-07-2014, 09:00 AM

Thanks guys - I looked the code up and saw all the possibilities, but this newest funky issue is leading me to lean towards the water temp sensor being the issue. No way engine temps can go from dead cold to at temp to halfway between to cold again in two seconds, and same thing with the fan - fan turns on, temp doesn't plummet in a second or two.

I can't access the DL for the FSM here at work, but thanks much for the link - hopefully I can get it when I get home.

SouthArk370Z · 05-07-2014, 10:32 AM

Quote:

Originally Posted by Quack?

Thanks guys - I looked the code up and saw all the possibilities, but this newest funky issue is leading me to lean towards the water temp sensor being the issue. No way engine temps can go from dead cold to at temp to halfway between to cold again in two seconds, and same thing with the fan - fan turns on, temp doesn't plummet in a second or two.

I can't access the DL for the FSM here at work, but thanks much for the link - hopefully I can get it when I get home.

I agree - sounds like coolant temp is the problem.

In my experience with industrial temperature measurement, RTDs and other resistive sensors _usually_ fail catastrophically and don't cause weird readings - they either work or they don't. I'd look at the wiring closely before deciding to change the sensor. A cheap VOM and the FSM should be enough to troubleshoot the problem; at this point, you are looking for erratic readings from the sensor or wiring, not necessarily accuracy.

Quack? · 05-22-2014, 12:23 PM

Finally getting the chance to work on this over the weekend - was out of town - and have been continuing to read up on possibilities. It seems on a number of cars the coolant temperature send unit can go bad, with the symptoms being typical of the exact problem I'm having - coolant values jumping all over the place. However, I'm looking through Nissan parts/online retailers and can't find one for the 370z. Does anyone know if the send unit is built into the sensor unit (as is the case on some cars)? That would explain why I can't find the replacement part, if it happens to be the case on our cars.

05-07-2014, 09:00 AM	#3 (permalink)
Quack? Base Member Join Date: Sep 2013 Location: Tampa, Florida Posts: 4 Drives: 04 370z Red 6MT Rep Power: 12	Thanks guys - I looked the code up and saw all the possibilities, but this newest funky issue is leading me to lean towards the water temp sensor being the issue. No way engine temps can go from dead cold to at temp to halfway between to cold again in two seconds, and same thing with the fan - fan turns on, temp doesn't plummet in a second or two. I can't access the DL for the FSM here at work, but thanks much for the link - hopefully I can get it when I get home. SouthArk370Z likes this.

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05-07-2014, 08:54 AM	#1 (permalink)
Quack? Base Member Join Date: Sep 2013 Location: Tampa, Florida Posts: 4 Drives: 04 370z Red 6MT Rep Power: 12	Trying to find it online, no luck so far - any chance anyone has pics/manual for the sensor location for the water temp sensor?

05-22-2014, 12:23 PM	#5 (permalink)
Quack? Base Member Join Date: Sep 2013 Location: Tampa, Florida Posts: 4 Drives: 04 370z Red 6MT Rep Power: 12	Finally getting the chance to work on this over the weekend - was out of town - and have been continuing to read up on possibilities. It seems on a number of cars the coolant temperature send unit can go bad, with the symptoms being typical of the exact problem I'm having - coolant values jumping all over the place. However, I'm looking through Nissan parts/online retailers and can't find one for the 370z. Does anyone know if the send unit is built into the sensor unit (as is the case on some cars)? That would explain why I can't find the replacement part, if it happens to be the case on our cars.