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Thread: Coolant temp circuit.

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Posts: 1-9 of 9
2009-06-12 03:47:22
#1
Coolant temp circuit.
So Ive had a few issues with my B13 turbo swap. I got it to start after replacing the dist. rotor. Now its only starting with throttle open. It bucks and runs rich. I pulled ecu codes and got knock sensor and coolant temp. So I pull the KS sensor to check voltage and continuance. probe harness...nothing. turns out it was missing a pin. Now I just need a new plug to splice in

Now I go to check coolant temp sensor voltage with key on. Nothing. checked voltage, resistance beween pins etc. I check the sensor resistance since its brand new, its good.

So the whole CTS circuit is dead. I tested 2 ecus so that is not the issue. Has anyone ever encountered this issue? Can I rewire it directly back to the ecu pins?
2009-06-12 04:06:03
#2
My mechanic is always dissing the Nissan harnesses. You might wanna rig up a direct wire. I think you have got it. That would totally explain the weird starts.
2009-06-12 04:15:50
#3
from what ive found the harness has two wires. One is 5 volt and the other wire is for signal return to the ecu. I was told it tees into another spor in the harness before going to the ecu. im posting from my phone so i cant download or view the pics from fsm unless theyre hosted. hopefully someone has a diagram. Its for a 91 ser. also what years did the harnesses change.
2009-06-12 04:32:15
#4
I'd check for continuity between the F222 connector and the sensor and then between the F7 connector and ECU connector.

That should determine if there is a break and if so what section. A visual check of the suspect wire should reveal any breaks. If that doesn't turn anything up then I'd just splice in a new wire for that section.




Edit: Diagram is from a 1991 FSM
2009-06-12 05:03:12
#5
Thanks man. Ill try this tomorrow since I really dont feel like putting a new harness in.
2009-06-12 16:13:50
#6
found the harness issue for the coolant sensor. Now I just need to get a knock sensor plug.
2009-06-13 05:37:07
#7
got the issue fixed. Thanks AngrySquid for the pic.
2009-06-13 06:08:38
#8
What ended up being the problem, I'm guessing it was pretty minor?
2009-06-13 19:39:43
#9
reaallly stupid actually. the f7 connector was loose. btw ill om you. i work and live in monroe wa.
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