Coolant Temp Sensor Drama

[040jqm]

Hey guys, for early r32 rb20det

Ive replaced coolant temp sensor 2 times, and replaced plug once, i can not find any problem with loom yet ECU still is reading Error 13 (Coolant Temp Sensor) - i know this is ECU pin 28 - what should this read at operating temp, and is there a way to bypass it or trick it into think all is well, as car is running rich as a mofo permanently and is basically undriveable

Edited April 7, 2007 by 040jqm

[Scooby]

checked continuity everywhere with a meter?

[040jqm]

cant work out where to find that wire in the loom, as it is all taped and covered in conduit....

it says 1v at 80deg, 3v at 20deg, so can i technically just bridge a wire from pin 27 which is AFM related and should only read from 1-1.5v

[WogsRus]

if the coolant sensor has been replaced, it's the CAS belevie it or not, been there done that.

see if you can borrow one to confirm.

[13thracer]

something simple you may allready know but there is two temp sensors on the engine one for the cluster and one for the ecu the one with the single spade/wire on it is for the cluster and the two pin one is for the ecu.

is the sensor you replaced the two pin one or the single pin one?

[MANWHORE]

040 - when you said it's been replaced 3 times - just making sure all bases are covered, but was it replaced with a new one?

[040jqm]

nah i replaced it with known working ones - CAS you reckon? interesting - may have to investigate!

[WogsRus]

i had something simmilar happen in a mates car, the car was constantly comming up with code 13, and it turned out to be a CAS.

[040jqm]

interesting!!! may have to investigate this possibility

[Scooby]

cant work out where to find that wire in the loom, as it is all taped and covered in conduit....

it says 1v at 80deg, 3v at 20deg, so can i technically just bridge a wire from pin 27 which is AFM related and should only read from 1-1.5v

just try between the temp sensor and the ecu connector, no need to dig through the loom.

[blind_elk]

Did you reset the ECU? The ECU retains error codes for 50 "start cycles" before clearing the error from memory.

[040jqm]

ok checked the voltage at the coolant temp sensor and ecu and they were both the same!!!

i have reset the ecu, and the code disappears, but comes back a few starts later!!!

[040jqm]

god damn cars!!!

[blind_elk]

ok checked the voltage at the coolant temp sensor and ecu and they were both the same!!!

They should be

i have reset the ecu, and the code disappears, but comes back a few starts later!!!

According to the good book, error 13 is "Break or short circuit in engine temperature sensor signal system"

I'm guessing you have a break somewhere in the wire, but it only breaks the circuit under some strange orientation condition. I would guess it will be close to the plug onto the sensor. Try wiggling the wire while measuring ohms between the plug and the ECU end.

[WogsRus]

yess but error sensor 13 is also connected to CAS, TRUST me on this, try a new one or one that works for sure. My mates skyline had the same issues,