Ecu temp sensor fault finding

[Jim_w]

Morning all,

Got an ecu temp sensor fault according to sp6 software. I'm about to investigate but wonder if anyone knows what the cold resistance reading should be across the sensor.

Cheers.
Jim

[Mattt]

IIRC I had that once, it went away next time I drove the car.

[Jim_w]

Cheers - unfortunately this is a 'reliable fault' and isn't going away. Apparently the ECU defaults to 95degs if there is any fault with the engin etemp sensor chain and that is the reading I'm getting - also getting the lower temp fan on all the time. The dash temp is different and more believable so I recon the fault lies between sensor and ECU and just wondered if anyone knew the correct sensor resistance when cold so I could start there - if not and the wiring/connectors look Ok I'll just get another one and see if that sorts it.

Jim

[mindstar]

Jim_w said:

Cheers - unfortunately this is a 'reliable fault' and isn't going away. Apparently the ECU defaults to 95degs if there is any fault with the engin etemp sensor chain and that is the reading I'm getting - also getting the lower temp fan on all the time. The dash temp is different and more believable so I recon the fault lies between sensor and ECU and just wondered if anyone knew the correct sensor resistance when cold so I could start there - if not and the wiring/connectors look Ok I'll just get another one and see if that sorts it.

Jim

Sorry but I'm of no help either on this.
If you do end up changing it, measure the old and new one and let us know too :-)

Kim

[shep1001]

Just measured a new sensor I have. 1.37 ohms

[mindstar]

shep1001 said:

Just measured a new sensor I have. 1.37 ohms

Noted!

you do know it's Sunday evening right?? Or is any excuse good enough to escape to the garage

[Jim_w]

Thanks - 0-2k  ohms when min - 10 max 95 degc courtesy of Graham V so seems about right. Will let you know what mine reads if faulty. Thanks for your help.

Jim

[Jim_w]

Thanks - 0-2k  ohms when min - 10 max 95 degc courtesy of Graham V so seems about right. Will let you know what mine reads if faulty. Thanks for your help.

Jim

[Basil Brush]

Jim_w said:

Cheers - unfortunately this is a 'reliable fault' and isn't going away. Apparently the ECU defaults to 95degs if there is any fault with the engin etemp sensor chain and that is the reading I'm getting - also getting the lower temp fan on all the time. The dash temp is different and more believable so I recon the fault lies between sensor and ECU and just wondered if anyone knew the correct sensor resistance when cold so I could start there - if not and the wiring/connectors look Ok I'll just get another one and see if that sorts it.

Jim

The dash is driven by it´s own seperate sensor further forward on the same side of the engine as the ECU sender, which is why it´s still giving a sensible reading.

[VARLEYHYD]

Jim_w said:

Thanks - 0-2k  ohms when min - 10 max 95 degc courtesy of Graham V so seems about right. Will let you know what mine reads if faulty. Thanks for your help.

Jim

Sorry it's -10 to 135 at 0-2k range with 95 default on fault

G

[Jim_w]

Thanks all - got 4.5k across faulty temp sensor - just put new one in - sp6 software happy, efi fault gone off dash and car starts - very happy boy.

[Jim_w]

Thanks all - got 4.5k across faulty temp sensor - just put new one in - sp6 software happy, efi fault gone off dash and car starts - very happy boy.

Edited by Jim_w on Saturday 12th March 22:42