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Thread: R15's Coolant temperature sensor failed for 4th time

  1. #1
    Rusted Juris's Avatar
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    Default R15's Coolant temperature sensor failed for 4th time

    I have 2009 (20P) R15, with 21.5K Kms on Odo. For last 1 year, the Coolant temperature sensor has gone kaput on 4 occasions. It first started after a Free Servicing (Yamaha free servicing camp). Later it showed in normal city riding. Third time it happened just after 600 kms from last occasion. On all these three occasions the Coolant temperature sensor was changed after diagnosing Thermosensor failure.
    After the third occasion, I got radiator setup, fan and relays checked. Infact, replaced the fan and relays. I have always ensured that the coolant level is upto the mark and I use Motocool coolant and Motul FS 15W50 engine oil (top up whenever required till 2.5k-3K kms). After 3rd occasion, I got my bike Joeled(big bore + Camshaft + FFE + Simota air filter+ head work+ Clutch springs and valve springs) and changed the CO2 level to 5. Since than the setup ran fine. After 4 months (run-in, extended run-in and normal run for around 3.5 kms post modifications) I tested my bike for 2 hours non stop ride and the engine warning light never popped up.
    However, on last Thursday the warning light popped again, after 2.5 hours of run, with one break in between. Checked with FID for the error code and it (error code 21) pointed to coolant temperature sensor.
    I want to put an end to the root cause. Need pointers to get this problem rectified. I am assuming wiring harness could be a possible culprit, which can cause short circuit. Apart from that I can't think of anything else.
    Experts please help.

    PS: I have no electrical modifications on my bike. I am not running HIDs or anything that can drain the battery and cause the engine warning light to pop. On every occasion I checked with FID and found that Coolant temperature sensor was malfunctioning and got it replaced.

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    Super Moderator Noor's Avatar
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    Query approved
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    Rusted Joel's Avatar
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    Please swap the wiring harness and check. Thats all that is left to change!
    [SIGPIC][/SIGPIC]
    joel@raceconcepts.in

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    Rusted Juris's Avatar
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    Quote Originally Posted by Joel View Post
    Please swap the wiring harness and check. Thats all that is left to change!
    Thanks Joel. Will swap and check.

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