Coolant temperature sensor

[Tinymartin]

Hi all, I have a 69 plate vw transporter and I have the EML on and get the code p218500 coolant temperature sensor 2 circuit high. Can you please confirm there are three sensors? One below the radiator, one in the block (i have changed both) and I think the other near the aux coolant pump. Can anyone please tell me if this code relates to the last sensor. Thanks in advance.

 

[mmi]

P2185 - Engine Coolant Temp Sensor on Radiator Outlet (G83)

 

[Tinymartin]

Changes all sensors and still has a fault

 

[mmi]

Wiring to the sensor? Unplug the sensor. Please verify that you have exactly 5.00 Volts at pin 1 (red) and solid ground at pin 2 (brown).

 

[Tinymartin]

If I don't have 5v to one of the sensors can I bridge 5v from another sensor or somewhere else?

Wiring to the sensor? Unplug the sensor. Please verify that you have exactly 5.00 Volts at pin 1 (red) and solid ground at pin 2 (brown).

 

[mmi]

If I don't have 5v to one of the sensors can I bridge 5v from another sensor or somewhere else?

No, the wire at connector pin 1 is ECU's "sensing" line - not a power (the simply shows as 5 Volts when open, less when connected as the sensors "pulls" the voltage down). Every sensor has it's own sensing line.

The missing 5 Volts at open connector means that also the ECU can't see the sensor - a wiring break somewhere between the connector and ECU. Of course could be the ECU itself at fault (not likely) - would indicate as e.g. "reference voltage" fault.

 

[catfood12]

G83 you say?..... Suspected broken wires, sign up to the club below;

EML/CEL and radiator fans running constantly

After around 700 miles of mainly motorway driving last week, I got a CEL. Also noticed that the radiator fans were running constantly. That was when I arrived home after a long drive, not stuck in traffic. Same next morning from cold, CEL and fans running constantly. Van still ran well, it did...

www.t6forum.com

 

[sharpej514]

Did you you find this fault I have the same issue. No ref voltage on pin1 when disconnected for sensor. New sensor fitted also