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Discussion Starter #1 (Edited)
On an 8 hour drive yesterday I found there's a data display easter egg in the 300C Electronic Vehicle Information Center (EVIC).

There are 7 pages of additional EVIC data you can access by pressing mode (music note) and compass on the steering wheel simultaneously for about 10 seconds. Use the leftmost Up/Dn arrows to scroll through the pages.

Page 1 - CCN SW P/N
Page 2 - Speed/RPM/Coolant Temp/BattV
Page 3 - Temp_AVG/Temp_RAW/Pedal_Position
Page 4 - Compass/Compass_RAW
Page 5 - Left/Right fuel tank level info
Page 6 - last VTA trig (???)
Page 7 - Chime request info,

Enjoy
 

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Sweet ... Thanks :)
 

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I do recommend trying this..... It was interesting watching the digital tach and speedo. But watching the pedal position was cool too. No, I didn't see if I could reach 100% .... But I wanted to... :-D
 

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Awesome little trick. Now I can't stop driving without it on. Its incredible watching the RPMS climb to the to the exact number.
 

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What does that gas tank data mean? I have had the pedal at 100%, it was easy :)
 

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Is that Left and Right data for the gas tank? It only has one tank! I thought it was Yaw data for the Yaw sensor and ESP...Hmmm...Need to re-read my display. But, Romli, thanks for the new toy. I was starting to get bored!
 

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arnoldw said:
Romli, thats a neat feature, how'd you figure it out? I wonder if there's some other little secrets?
I don't recall seeing this one in the manual (not that I actually read it or anything). Maybe this is something intended for the service technicians.
 

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My service manual should arrive in a few days - I hope to find other little technician tricks like this in there. My GM manuals used to list some of these as well.

Now if only that car would arrive....
 

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If you find any.... Please don't be shy with the info.... :-D
 

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LWOOD said:
Is that Left and Right data for the gas tank? It only has one tank! I thought it was Yaw data for the Yaw sensor and ESP...Hmmm...Need to re-read my display. But, Romli, thanks for the new toy. I was starting to get bored!
I just put my 300C on the hoist for it's first oil change, couldn't wait to have a look underneath. Guess what? The gas tank , or tanks are on both sides of the driveshaft just ahead of the rear axle! It looks like they ARE connected above the driveshaft however.
 

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I had seen that, too when underneath my C at an oil change. I guess it could be a left and right side fuel pick up since the tank is so oddly shapen, which would make sense. Also the display on that screen shows a symbol that never changes and that is 19g. 19 gallons is the capacity of the tank.
BUT, what I don't understand it the moving numbers in the L and R columns...They don't ever seem to equal anything less or more than one hundred. If it was a fuel totalizer, the numbers from both columns would decrease over driving time. Maybe they do and I'm not paying close enough attention. I AM trying to drive and look at the same time.
Next time I go to the DLR I plan to get to the bottom of this. I'll let you know if nobody figures it out befor that.
 

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LWOOD said:
I had seen that, too when underneath my C at an oil change. I guess it could be a left and right side fuel pick up since the tank is so oddly shapen, which would make sense. Also the display on that screen shows a symbol that never changes and that is 19g. 19 gallons is the capacity of the tank.
BUT, what I don't understand it the moving numbers in the L and R columns...They don't ever seem to equal anything less or more than one hundred. If it was a fuel totalizer, the numbers from both columns would decrease over driving time. Maybe they do and I'm not paying close enough attention. I AM trying to drive and look at the same time.
Next time I go to the DLR I plan to get to the bottom of this. I'll let you know if nobody figures it out befor that.
I notice when I make turns it affects the L + R columns accordingly. Maybe it IS tied into the ESP. I'm going to fill the tank and see if that makes a difference.
 

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Maybe it's the percent fuel remaining in the left and right side of the tank. After a fillup, I would expect it to read close to 50/50. Just a thought.
 

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Ok, I filled my tank today, it took 15 gallons. The readout read MinL=191,MinR=197,Lt=35,Rt=6,avg=38 before fillup.
After fillup it read,MinL=181,MinR=181,Lt=80,Rt=72,avg=149.
I have no idea what this means.
 

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Well, at first I thought maybe they were resistance values, but after looking that up in the service manual, I don't think they are. For what its worth (probably not much) here is some info on info received from the fuel sending unit to the instrument cluster. Also - - I don't know if this is common knowledge, but you can apparently put the cluster into a test mode or get info like engine hours using the trip odometer button... here is the excerpt:

Fuel Level Sending Unit Input - The cluster provides a constant current source to the fuel level sending unit
and monitors a return input on a fuel level sense circuit. The resistance through the fuel level sending unit
increases as the fuel level falls and decreases as the fuel level rises causing changes in the sense input voltage.
The cluster programming applies an algorithm to calculate the proper fuel gauge needle position based
upon the fuel level sense input, then moves the gauge needle to the proper relative position on the gauge
scale. This algorithm is used to dampen gauge needle movement against the negative effect that fuel sloshing
within the fuel tank can have on accurate inputs from the fuel tank sending unit to the cluster.


While in the odometer mode with the ignition switch in the On position and the engine not running, depressing the
odometer/trip odometer switch for about six seconds will display the engine hours information. Holding this switch
depressed while turning the ignition switch from the Off position to the On position will initiate the EMIC self-diagnostic
actuator test. Refer to the instrument cluster diagnosis and testing service information for additional details on
this cluster function. The EMIC microprocessor remembers which display mode is active when the ignition switch is
turned to the Off position, and returns the VFD display to that mode when the ignition switch is turned On again.
 

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So, it appears that that screen is the raw data for the Fuel mileage and Distance to Empty displays on the EVIC. The reason why the numbers don't change dramatically is they ARE resistance (Min resistance 181) so as the tanks get lower, resistance would increase causing the guage to fall on the panel. But the numbers always fall within a specific envelope.
That makes sense to me, I think we found an answer. Thnks to kampsville for showing the way!
 
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