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Is it safe to assume the sensor sends a reading to the CCU? If so, can I unplug the TH2 plug from the ccu and take a reading from the unplugged (still plugged in at the sensor) wires to see if the data is "making it to" the ccu from the sensor?
Does that make sense?
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Originally Posted by: sabresfan  Is it safe to assume the sensor sends a reading to the CCU? If so, can I unplug the TH2 plug from the ccu and take a reading from the unplugged (still plugged in at the sensor) wires to see if the data is "making it to" the ccu from the sensor?
Does that make sense? Sabrefan, Very good, you're on top of it. I thought I had mentioned that in my post, but I guess I forgot it. You'll need some "pin point" meter probes or a couple of large paper clips to do the test at the TH2 connector, but you'll do fine. :) :) :)
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Makes sense. I am going to assume the "contacts" are recessed too far to standard MM probes? So just so I have it straight....I should disconnect the TH2 connection from the CCU. fashion some paperclips to stick in there and test using the MM. I should see the same reading there as I should at the sensor itself. If not, the reading is getting lost somewhere between the sensor and the CCU. Does that sound right?
Thanks for all the help!
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Rank: Advanced Member
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Originally Posted by: sabresfan Makes sense. I am going to assume the "contacts" are recessed too far to standard MM probes? So just so I have it straight....I should disconnect the TH2 connection from the CCU. fashion some paperclips to stick in there and test using the MM. I should see the same reading there as I should at the sensor itself. If not, the reading is getting lost somewhere between the sensor and the CCU. Does that sound right?
Thanks for all the help! Sabrefan, You have it exactly right, Great job. :D :D :D
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Did you ever resolve this? I'm got another post about the same thing - replaced the sensor, heater relay and now the CCU and still getting an F05. (Heater element tests fine at 15ohms.) I'm at a loss!
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Originally Posted by: twarnock Did you ever resolve this? I'm got another post about the same thing - replaced the sensor, heater relay and now the CCU and still getting an F05. (Heater element tests fine at 15ohms.) I'm at a loss! Twarnock, You'll need to perform the resistance checks the the thermistor at the CCU, using paper clips and a multi meter, like the last APP post to Sabresfan. You've coverred everything except the harness and the plug connector pins in the connector. Good Luck and Thanks
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Thanks. I just posted an update/resolution to my original post in this forum. It turns out it was the wiring harness between the temp sensor and the CCU - one of the black wires was open. Ran a replacement wire and all is well! Thanks!
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Originally Posted by: twarnock Thanks. I just posted an update/resolution to my original post in this forum. It turns out it was the wiring harness between the temp sensor and the CCU - one of the black wires was open. Ran a replacement wire and all is well! Thanks! Twarnock, Great, We're glad for you. So you're up and running and all is good. Thanks for the update, we appreciate it. Good Luck and Thanks
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I am having same problem and curious how you found that it was the wire. I don't know how to test that to find out if it is my problem. I checked the water temp sensor and found that it reads about 9ohms at room temp, but don't know how to find out if it is a wire, heater, relay or what??? I am a novice. If you can direct me, please help. thanks!
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Having same problem, f05 code after 2-3 minutes and only hot water regardless of setting. Can you tell me how to perform resistance checks on wire harness at ccu, heater element and heat relay? I have tested water temp sensor and it tests fine... but I am a novice and do not know how to check the other things. Thanks
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