outside temperature sensor

Need technical Q/A then you're in the right place

Moderator: martauto

Post Reply
User avatar
rash_1
E30 Zone Newbie
E30 Zone Newbie
Posts: 110
Joined: Sun Sep 27, 2009 11:00 pm
Location: north london

Thu Jul 01, 2010 4:42 pm

hi my temperature centre keeps saying -30 degrees, everything else works, ie fuel range and mpg etc, do i have to change the entire obc or does it have a sensor.

many thanks
daimlerman
**BANNED**
Posts: 15968
Joined: Mon Feb 27, 2006 11:00 pm
Location: Grumpy Old Man

Thu Jul 01, 2010 4:46 pm

Sensor is(should be!)located in the n/s brake air duct,accessable from underneath the front of your car.Could also be a broken wire in the circuit....
Youth is wasted on the young.
User avatar
rash_1
E30 Zone Newbie
E30 Zone Newbie
Posts: 110
Joined: Sun Sep 27, 2009 11:00 pm
Location: north london

Fri Jul 02, 2010 10:33 am

hi i tried the sensor but still the same. will i need to take out the obc to check the circuit?
daimlerman
**BANNED**
Posts: 15968
Joined: Mon Feb 27, 2006 11:00 pm
Location: Grumpy Old Man

Fri Jul 02, 2010 12:23 pm

Cannot remember the wire colours off the top of me head,but the temp sensor wire enters the car under the fusebox,through that big grommet,and I think there is a connector there,if you check the wire colours at the sensor,then drop the glovebox and it's trim panel and have a hunt among the spagetti for the same two wires you can then check them for continuity.
Youth is wasted on the young.
User avatar
Brianmoooore
E30 Zone Team Member
E30 Zone Team Member
Posts: 49358
Joined: Mon Jan 10, 2005 11:00 pm

Fri Jul 02, 2010 1:17 pm

Colours are brown and blue - the same as UK mains flexible cords.
skipunda
E30 Zone Team Member
E30 Zone Team Member
Posts: 5672
Joined: Thu Sep 04, 2008 11:00 pm
Location: Cornwall/Plymouth

Fri Jul 02, 2010 1:36 pm

Just touching the two wires at the sensor end and observing the result at the obc end should tell you whether there is a break in the wire or significant corrosion at the sensor, no?

don't try this till an expert posts though!
Chris
User avatar
Brianmoooore
E30 Zone Team Member
E30 Zone Team Member
Posts: 49358
Joined: Mon Jan 10, 2005 11:00 pm

Fri Jul 02, 2010 1:38 pm

That should put it off of the scale at the opposite end, but won't do any harm.-
The problem is very likely to be within 6" of the sensor.
skipunda
E30 Zone Team Member
E30 Zone Team Member
Posts: 5672
Joined: Thu Sep 04, 2008 11:00 pm
Location: Cornwall/Plymouth

Fri Jul 02, 2010 1:42 pm

Brianmoooore wrote: The problem is very likely to be within 6" of the sensor.
All of mine have had either corrosion or broken wire within 6" too. Good news is the sensor comes apart
Chris
Post Reply