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Post by korjaa on Jan 29, 2020 7:23:59 GMT
Anyone know if I can read coolant level sensor value with OBDeleven? I think it might be just on-off signal, but that would be useful as well.
The turned on the coolant level warning few times now randomly (in cold weather) even if there is plenty of coolant liquid. I was thinking that I could read the sensor value from OBDeleven and go wiggle the wires to see if there is bad contact somewhere.
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Post by Matthew on Feb 8, 2020 18:06:00 GMT
It is just an on/off connection as you said. This is only used in instrument cluster #17. The ECU and transmission doesn't get this information.
The 2 wires from the connector literally connect to the back of the instrument cluster with the coolant electrically closing the circuit.
In your case, you have a bad contact in your wiring. If I didn't change my MK5 clock to a MK6 one, earlier this week, I'd tell you where in live data to look for it.
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Post by korjaa on Feb 11, 2020 6:25:28 GMT
This is good info, I'll try to look more closely to the instrument cluster, thank you.
I haven't got the error recently and the only time I got it, it was cold morning with -20 °C outside. Also I took off the connector to the coolant container used a chemical pin cleaner + protector to maybe aid the issue in future.
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Post by Matthew on Feb 12, 2020 13:47:25 GMT
Are you using genuine G12 / G13 coolant? Plain tap water or filtered water isn't as conductive. Can you measure the resistance of the electrodes from the water bottle itself with the coolant in it (both when the engine is hot and cold)? Is there a drastic difference in electrical resistance?
Edit: I noticed your response mentioned -20*C weather, so I assume you aren't using actual water in your cooling system to risk freezing.
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Post by korjaa on Feb 14, 2020 10:52:18 GMT
It's not plain tap water, but It's not the genuine one either. I picked it up from local parts store.
The labeling says:
- 50% LongLife coolant
- Contains corrosion inhibitors and monoethylene glycol.
- Anti-freeze up to -36 °C
- Replace in 5 years
- Partially bio degradable
- Color is red, if it's any worth
The whole system got drained from the bottom during the thermostat change so there should be no mixture.
I tried to measure the sensor last time I had the hood open (30min standby after warm engine), but I couldn't get any readings in the 200kΩ range. Not sure what kind of readings it should be giving.
And of course I forgot to re-plug the sensor and got immediate coolant warning. Plugging in the sensor removed the warning, so I guess it's at least partially functioning.
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Post by korjaa on Feb 14, 2020 10:58:49 GMT
G12+ sounds to be kind of similar stuff (https://www.blauparts.com/vw/vw_fluid/vw_coolant_engine_fluid.shtml)
"Eco-friendly monoethylene glycol based coolant. Phosphate, borate, silicate, nitrite, amine free."
"Superior cold temperature performance with freezing protection up to -37° C (50/50 ratio) and up to -52° C (60/40 ratio). Excellent frost protection in severe winter climates."
"Contains premium corrosion additives for optimal corrosion prevention for all metals and metal alloys including aluminium in cooling systems. Doesn't eat away at plastic and rubber components of the cooling system."
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Post by Matthew on Feb 14, 2020 13:49:09 GMT
And of course I forgot to re-plug the sensor and got immediate coolant warning. Plugging in the sensor removed the warning This is sufficient. Any further fault codes would be an intermittent open circuit in your wiring somewhere. It becomes a time-consuming process just to replace the section of the wiring harness from the coolant bottle to the instrument cluster itself. |
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Post by korjaa on Feb 28, 2020 18:13:44 GMT
Got some more beeps again this morning with -18 °C.
Saw a video today on YouTube where they hinted for the resistance value of the coolant sensor.
On the video the coolant level sensor was 283 kΩ with warm engine (88 °C). Of course there is going to be variance there with different coolants and mileage, but around that and not 1 MΩ.
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