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S60R intermittant coolant temp sensor failure S60 2006

posted by  Rockytop on  Fri Aug 13 03:01 CST 2010
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last visit: Tue May 10 13:59 CST 2011
[RELATED]

Happened 3 times: 1) no activity on dash temp gauge, totally dead. 2) ECU definitely goes into a "limp home" mode b/c horsepower is down from 300 to about 100 (not kidding). 3) after 4-5 drive cycles, the Check Engine light comes on. 4) eventually a few days later, the gauge returns to normal and Check Eng light goes off several drive cycles later.
Tapped on brass sensor on engine, wiggled wires, etc, w/ no immediate effect. It returns to working while driving each time(?)
The last 2 times it stopped were the same day that I changed oil and then immediately after I filled it up w/ gas yesterday. Coincidence?
Any ideas on what to do until I can take it in? Any help w/ where the wiring would have connections under the hood (other than at the sensor)? thanks








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    UPDATE S60R intermittant coolant temp sensor failure S60 2006

    posted by  Rockytop on  Tue Aug 24 00:46 CST 2010
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    last visit: Tue May 10 13:59 CST 2011
    [RELATED]

    dealer performed warranty work and said that it was a TSB for a software / ECM update. Glitch also applies to other volvo models and supposedly can cause many random, random problems that no one would normally suspect as a computer problem (like a dead temp gauge).
    "Part" on invoice was 30677021 or 30677021-5. Let's hope it works.








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      UPDATE S60R intermittant coolant temp sensor failure S60 2006

      posted by  jadnhm on  Tue Aug 24 03:47 CST 2010
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      last visit: Tue May 22 18:03 CST 2012
      [RELATED]

      Thanks for the part number. Ii wish more folks would share that info on the boards.

      Is there any indication from your bill what the TSB number is? Could you inquire with your dealer (for your records of course) and post the number here for the rest of us?

      --
      1998 V70 AWD->FWD Turbo 200k+








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    S60R intermittant coolant temp sensor failure S60 2006

    posted by  tmannian on  Fri Aug 13 06:56 CST 2010
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    last visit: Sat Sep 20 10:31 CST 2014
    [RELATED]

    Do you know exactly what codes were set?








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      S60R intermittant coolant temp sensor failure S60 2006

      posted by  Rockytop on  Sat Aug 14 15:36 CST 2010
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      last visit: Tue May 10 13:59 CST 2011
      [RELATED]

      Missing signal from sensor. Resistance was ok from sensor and four volts from connecter into sensor. relay to check or common connectors to check?
      --
      Two 1995 854 GLT's (w/ manual transmissions)








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    S60R intermittant coolant temp sensor failure S60 2006

    posted by  KlausC on  Fri Aug 13 04:58 CST 2010
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    last visit: Fri Oct 24 10:15 CST 2014
    [RELATED]

    The new engines no longer have a separate/replaceable ECT sensor, it is part of the housing and it all gets replaced with a new thermostat. $$$.

    So, the next time it fails on the dash, try to check the Ohms at the temp sensor and if it is zero then that is your problem. If the Ohms are at least 200+ (higher with a cold engine), then it is the wiring.

    Klaus
    --
    Two good Volvos, a 220 and a V70R







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