Temperature creeps up on its own

RogerFord
Posts: 7
Joined: Thu Feb 05, 2009 5:21 pm

Temperature creeps up on its own

Postby RogerFord » Sat Feb 28, 2009 11:46 pm

I have the DL1 linked to Dash2. Channel 1 is dedicated to Water Temp. It comes on at a reasonable level, but then gradually creeps higher (without the engine running). In about five minutes it's gone from 5 degrees to 30 degrees, and in half an hour maybe 150 degrees.

The sensor is a standard Caterham water temp sensor, with a 255 ohm pull up resistor to the 12V output of the DL1.

I can't quite figure out what would cause it to creep up in this manner. Other sensors (including oil temp) seem OK Any suggestions for what to check?

CharlesElliott
Posts: 133
Joined: Mon Mar 26, 2007 8:22 pm

Postby CharlesElliott » Sun Mar 01, 2009 11:25 am

Which water temp sensor have you linked it to? The one that services the gauge I assume (rather than the ECU one).

What are the resistance characteristics of the sensor?

RogerFord
Posts: 7
Joined: Thu Feb 05, 2009 5:21 pm

Postby RogerFord » Sun Mar 01, 2009 2:26 pm

Yes, the single wire sensor for the gauge. Resistance characteristics? Don't know - using Tim's config. Will check later.

RogerFord
Posts: 7
Joined: Thu Feb 05, 2009 5:21 pm

Postby RogerFord » Sun Mar 01, 2009 3:20 pm

That's weird, it's not doing it today. Sitting steady at 7 degrees. Hmm....

RogerFord
Posts: 7
Joined: Thu Feb 05, 2009 5:21 pm

Postby RogerFord » Sun Mar 01, 2009 3:36 pm

Spoke too soon. It is rising - seems to do more so when not logging.

The log shows the voltage on that sensor (if I'm doing it properly) is zero most of the time with occasional sudden spikes up to something very small.

Will recheck the wiring.

RogerFord
Posts: 7
Joined: Thu Feb 05, 2009 5:21 pm

Postby RogerFord » Sun Mar 01, 2009 4:18 pm

Leg had broken on the pull-up resistor. Think I'm going to re-do them all.


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