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Go Back   REVscene Automotive Forum > Technical Discussion > Maintenance, Engine & Driveline Tech

Maintenance, Engine & Driveline Tech This forum is brought to you by The Speed Syndicate (TSS) in Burnaby.
Discussion of maintaining your engine, transmission, differentails, rear ends, and mods associated with "driveline" parts..

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Old 11-06-2009, 08:59 PM   #1
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code 6 engine coolant temp sensor

like the title says...finished a engine swap on a 93 accord and this is what is coming up when i jump it.

I thought it was because of an air lock in the system, Ive bled it many differnt ways and still cannot clear the code.

I beileve im not clearing the codes properly..from what ive been told you have to remove a "back up" fuse for coolant and a/c control, you have to do this for 10 seconds and then start it again. i have done this everytime after I have bled the coolant but it still comes up.

was just wondering if anyone here knows somethin i dont. thanks for readin
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Old 11-07-2009, 12:30 AM   #2
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Here's how my train of diagnoise would go,


after bleeding the system I would reset the ECU by pulling the negative for ten minutes.

if the code popped up again I would change the sensor since there cheap and reset the ECU again.

after that, try tracing some wires, one of my buddys had a car that wouldnt pass aircare and it turned out the o2 sensor wires were backwards.

and if all else fails pull the bulb and call it a day
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Old 11-07-2009, 01:33 AM   #3
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that's correct. remove the backup fuse for the ecu. to reset codes.

i agree with everything 00EM1 says except for pulling out the bulb lol.
that will only cause bad fuel consumption and you're just ignoring a problem.

but more than likely its just a bad sensor or disconnected.
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Old 11-07-2009, 12:48 PM   #4
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yeah ive tried pulling the negitive cable...also tried connecting the negitive and positive cable to drain any remaing memory out of the ECU to reset it, ive tried a differnt sensor (not brand new)

Is the back up fuse in the engine bay or inside under the kick pannel? and how long does it have to be removed? i was told 10 seconds...
does the car have to have power runnin when you pull it??

Last edited by neilb33; 11-07-2009 at 12:50 PM. Reason: typo
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Old 11-08-2009, 08:06 PM   #5
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Check the wiring between the sensor and the ecu using a multimeter.
There may be a short or broken wire; I had that problem with my CRX last summer.
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Old 11-08-2009, 09:48 PM   #6
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yeah, do i test just at the connector that plugs into the sensor? what do i test for? resistance? i cant imagine a wire bein broken, everythings soo very clean.
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Old 11-08-2009, 11:12 PM   #7
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The simple thing to check is the sensor itself, there should be around 200-400ohms between the pins.

Then see if you have 5volts between the Red/White wire and Ground: If not there is a break between the sensor connector and ECU Pin D13.

Then check to see if you have 5volts between the Red/White wire and the Green/White wire at the temp sensor; If not there is a break in the wire between Green/White and D22.

Hopefully that works for you; It's straight out of the Helms manual.
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