Temp gauge re-code

[Overboost]

So it seems as though we do have an alarm for overheating engine on the high clusters which would be a gong and a text message in the cluster coming from the LCM as per wpoll's advice. I looked at my trace file for my C22 LCM and found the following.

KUEHLMITTELTEMP = melden (reported)
(CHECK CONTROL FOR COOLANT TEMPERATURE)

KUEHLMITTELUEBERTEMP_CAN = activ
(CAN-BUS COOLANT OVERHEATING)

MOTOR_UEBERTEMP = 125_grad_celsius - 125 ºc (257 ºf)
with an option of 130_grad_celsius - 130 ºC (266 ºf)
(ENGINE OVERHEATING [TEMPERATURE_ºC=DATA])

So if MOTOR_UEBERTEMP are the alarm thresholds:

I will add another parameter to MOTOR_UEBERTEMP:

115_grad_celsius - 115 ºc (239 ºf)

Open up the LCM.Cxx file with NCS Dummy without loading any FSW_PSW files, go down to MOTOR_UEBERTEMP, right click it, and click "add parameter". Name it whatever you want, and under data put the hex value of the temp alarm you want. Then click on module -> update module.

You will be able to select that new parameter when coding the LCM now.

[80stech]

I found light does indeed come at 125 C. The DME will read the DME side of the coolant sensor when engine is running. When engine is not running and there is a fault with the guage side of the sender the mapping using the ACT seems to take over. If gauge side is working it will be read when engine is not running. Next I will try to look at NCS Dummy for the low clusters.

I imagine then the extra display portion on the high cluster reads info from the can bus?

[wpoll]

Originally Posted by 80stech

I found light does indeed come at 125 C. The DME will read the DME side of the coolant sensor when engine is running. When engine is not running and there is a fault with the guage side of the sender the mapping using the ACT seems to take over. If gauge side is working it will be read when engine is not running. Next I will try to look at NCS Dummy for the low clusters.

I imagine then the extra display portion on the high cluster reads info from the can bus?

I'm pretty sure that the display section on the high cluster is as you suggest, 80stech. Data is sent to this display by various modules via the I-Bus (not CANbus), just like the MID display.

Given that the high temp warning originates in the LCM module, it's possible that this I-Bus telegram is still interpreted by the low cluster and turns on the red over-temp lamp (LED?). If so, then the re-code is possibly the same for high or low cluster, esp. given that it's a re-code in the LCM.

Worth a crack...

BTW, is there an audible alert to go with the red lamp on the low cluster, as there would be with the CC message on the high cluster? If so, this would be further support for the theory that both cluster types receive the same telegram from the LCM but just display it differently.

[80stech]

Interesting, it looks like the bus topology between the 2 clusters is a lot different but neither has access between the DME (CAN bus)and the LCM (I or K bus) without going through the cluster. I don't get an audible warning when I trigger the light, but that might be codeable. Will see!

[wpoll]

Originally Posted by 80stech

Interesting, it looks like the bus topology between the 2 clusters is a lot different but neither has access between the DME (CAN bus)and the LCM (I or K bus) without going through the cluster. I don't get an audible warning when I trigger the light, but that might be codeable. Will see!

Yep, the high IKE is a bus datagram translator between the K, I and CAN buses and the low IKE only has K and CAN buses. This does make things subtly different...

[80stech]

There also seems something strange going on with the guage data points, I think the posted gauge data point simulator might be a little misleading. Not a big deal if we can count on the light or gong but might be somethng to look into that later.

[Overboost]

Originally Posted by 80stech

There also seems something strange going on with the guage data points, I think the posted gauge data point simulator might be a little misleading. Not a big deal if we can count on the light or gong but might be somethng to look into that later.

My markers on my gauge seem to be spot on. What do you have for your markers/values? I know that SilberVogel had a discrepancy on facelift vs. prefacelift and has the PFL/FL check boxes on his simulator. I believe our E53 uses the PFL?

[80stech]

I didn't look to carefully, part of it could be that the values are changing because I had the the engine running and I was trying to keep up with my old rotary switch type decade box.
Pretty sure though the guage will not go to the end of the red until temp is a lot higher 140-150 C. Again, I didn't even double check the numbers I have coded so might be just me. Light does come on over 125 C regardless of the guage though, which is good!

[Overboost]

Originally Posted by 80stech

I didn't look to carefully, part of it could be that the values are changing because I had the the engine running and I was trying to keep up with my old rotary switch type decade box.
Pretty sure though the guage will not go to the end of the red until temp is a lot higher 140-150 C. Again, I didn't even double check the numbers I have coded so might be just me. Light does come on over 125 C regardless of the guage though, which is good!

I have never been able to check the values over my normal operating temperatures so I am interested in your findings. The values being on the money for everything leading up to the operating temperatures lead me to believe the higher marks would be accurate?

Also, what light are you seeing? You have the high cluster in your 2004 and I am under the impression the high clusters went away from the light for a message?

[80stech]

No, I have the low cluster.