Temp gauge re-code

[Overboost]

Originally Posted by wpoll

Hmm... so that info. requires a re-think of how the alerts etc. work...

Still trying to track down my spare sensor so I can test my new 110c setting. I guess a chunk of cardboard down the grill might do it too..

Yes, with this new info I am wondering if the 115C alarm I set will actually work if the message is limited to the CAN message from the DME.

[wpoll]

Originally Posted by Overboost

Yes, with this new info I am wondering if the 115C alarm I set will actually work if the message is limited to the CAN message from the DME.

So the second sensor wired to the IKE drives the gauge but the warning comes from the DME/DDE via CAN bus... so to test this we need to futz with the engine temp sensor and not the gauge temp sensor, to convince the DME/DDE that the engine is overheating... sounds a bit dodgy..

[Overboost]

Originally Posted by wpoll

So the second sensor wired to the IKE drives the gauge but the warning comes from the DME/DDE via CAN bus... so to test this we need to futz with the engine temp sensor and not the gauge temp sensor, to convince the DME/DDE that the engine is overheating... sounds a bit dodgy..

Well to prove our alarm settings in the LCM are indeed working, we need to verify the temp at 110C in your case and see if it alerts.

[wpoll]

Originally Posted by Overboost

Well to prove our alarm settings in the LCM are indeed working, we need to verify the temp at 110C in your case and see if it alerts.

Might try the suggested methods combined - drop the alarm temp setting to 100c then go for a drive with the radiator blocked by cardboard - 100c shouldn't stress my diesel cooling system overly and at least we'll then know!

Although I 'spose that not really any different than dong what Crowz suggests - setting the alarm at 85c.

I'm back at work now, after our summer break, so have less daylight hours to play with this.. But at least its warm here!

P.S. - I'm NOT actually going to stick cardboard in front of the radiator - there's too many other things up there that need air flow, like the intercooler, oil cooler etc.

[Overboost]

Originally Posted by wpoll

Might try the suggested methods combined - drop the alarm temp setting to 100c then go for a drive with the radiator blocked by cardboard - 100c shouldn't stress my diesel cooling system overly and at least we'll then know!

Although I 'spose that not really any different than dong what Crowz suggests - setting the alarm at 85c.

I'm back at work now, after our summer break, so have less daylight hours to play with this.. But at least its warm here!

P.S. - I'm NOT actually going to stick cardboard in front of the radiator - there's too many other things up there that need air flow, like the intercooler, oil cooler etc.

Right, I didn't think about the oil cooler and intercooler...

[80stech]

Originally Posted by wpoll

So the second sensor wired to the IKE drives the gauge but the warning comes from the DME/DDE via CAN bus... so to test this we need to futz with the engine temp sensor and not the gauge temp sensor, to convince the DME/DDE that the engine is overheating... sounds a bit dodgy..

From what I get out of reading that factory info and poking around is that the gauge side of the sensor doesn't get used for anything. I did a ton of futzing on the DME side with no dodgyness happening other than setting a code for it being shorted.

[wpoll]

Originally Posted by 80stech

...

I did a ton of futzing on the DME side with no dodgyness happening other than setting a code for it being shorted.

Good to know - thanks for blazing the trail.