Evening all
Got an issue with my Ed30. VAGCOM had shown an intermittent fault with the radiator outlet coolant temp sensor, so I swapped it for a new OEM sensor last weekend. However that doesn’t seem to have fixed the problem so I logged the sensor voltage on my commute yesterday, and it shows the temperature reading intermittently dropping to -45 degrees (which indicates the sensor going open circuit). Now I might be unlucky and have got a dud new sensor, but I’m guessing it’s more likely a break in the wiring loom.
I’m going to try to check this tomorrow by wiggling the wiring loom whilst watching the temp reading on VAGCOM. But if it is a break I’ll need to replace the wires and am thinking I’ll buy a new connector with terminal pins and then run a new pair of wires - but have a couple of questions:
- does anyone have a wiring diagram or can tell me which pins on the ecu this sensor connects to?
- the Haynes “book of lies” says that if the ecu is disconnected then all settings are lost and VW have to reinstate the basic settings. Is this really true? I’ve disconnected several ecu’s in other cars before without issue, and surely there’s no difference between disconnecting the wiring from the ecu and disconnecting the battery?
- finally, is it possible to buy replacement terminals for the ecu connector? I’ve found replacement 2 pin plugs to fit the sensor on eBay.
Thanks
Dave