oil sender unit

[spivvy]

for some reason my oil pressure guage is not registering pressure
i am pretty certain it must be a short somewhere but is there any way to check if you have oil pressure as i don't want to risk damaging the engine ,
also anyone know a way of testing the unit ??


thanks in advance for any help

[Le TVR]

Can you measure a voltage at the sensor terminal?
If yes, disconnect wire from sensor and measure the resistance between the terminal and ground. (IIRC should be less that 500 ohm)

No voltage - check gauge and wiring
No resistance - check sensor
Volts + resistance OK - check engine

[WildfireS3]

If it is the sender unit that has gone, it is about £35 from TVR as it is a specific part, or so I am told.

[spivvy]

Le TVR said:

Can you measure a voltage at the sensor terminal? If yes, disconnect wire from sensor and measure the resistance between the terminal and ground. (IIRC should be less that 500 ohm) No voltage - check gauge and wiring No resistance - check sensor Volts + resistance OK - check engine

thanks will check tonight

[Rozza!!!]

I think they are becomming few and far between too. I had to ring quite a few places to get hold of one about six months back, but then that could have been me being unlucky.

Roy.

[spivvy]

Le TVR said:

Can you measure a voltage at the sensor terminal? If yes, disconnect wire from sensor and measure the resistance between the terminal and ground. (IIRC should be less that 500 ohm) No voltage - check gauge and wiring No resistance - check sensor Volts + resistance OK - check engine

is this with engine on or off
i seem to get 5 volts at the sender with engine on but no resistence

[Le TVR]

That was with ign on, motor not running.

If there is no resistance (open circuit) then it sounds like the pressure sensor has gone awol.