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3rd December 2018, 19:22 | #11 | ||
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Simon
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3rd December 2018, 20:05 | #12 | |
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The actual fault is described as "CANBUS Messages Failure Instrument Pack 3" by T4, and the symptoms are specifically no rev counter, temperature gauge, or heated rear window. It is not caused by low battery voltage, a spike, or indeed anything other than an internal failure of one specific IC on the DDE4, and replacing the battery, charging it up, disconnecting it for a while is going to do absolutely nothing If you wish to try this out, unplug your instrument pack, then see if it is possible to activate the heated rear window Brian P.S. almost every DDE4 with this defect is from an age range encompassing VIN 1M, and rarely if ever are these units ever water damaged. I tend to use them as donor units for conversion of NNN100693 ECM units to make them into NNN100692SR Last edited by marinabrian; 3rd December 2018 at 20:17.. Reason: added post script |
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4th December 2018, 11:20 | #13 | |
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PS. Cor, you did hammer poor old Simon a bit.----He didn't seem to be specific. Just that he would be SURPRISED if the heated rear window was involved. PPS. Couldn't you see your way to just letting him be SURPRISED and not totally wrong.---------------------------------------- |
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4th December 2018, 15:51 | #14 | |
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4th December 2018, 21:31 | #15 |
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Thanks for all the answers guys.
I changed the battery to a Varta Silver Dynamic 74Ah 750A. The voltage it's 12.7 - 12.8 now, the alternator charging at 14.4 - 14.5. The car starts much better now. After that, the gauges works intermittent - > VIDEO The problem it's the NEC marked with blue in this PHOTO? If this is, isn't easier to take out the NEC from my spare DDE4 and put it on my main one? Like this I can still have the car original ECU. I've did that before on a navigation system (android aftermarket) and it worked. |
4th December 2018, 22:34 | #16 | |
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Brian |
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4th December 2018, 23:05 | #17 | |
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5th December 2018, 08:15 | #18 | ||
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Nothing you have said assists with my original statement that I would be surprised if the CAN bus has anything to do with the HRW operation, which I stand by. Simon
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5th December 2018, 12:27 | #19 |
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I'm sorry Simon but you are incorrect.
Why then does replacing the EMS ECU correct the problems? I have a pile of ECU's with this exact problem, it's failure of the Can-bus controller within the ECU, as Brian said above there's no particular reason. Some of the ones I have are prestine with no sign of water ingress they can and do sometimes give up the ghost. The Can-bus does indeed have a direct link to the operation of the HEVAC and operation of the HRW Russ
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5th December 2018, 13:13 | #20 | |
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Thanks for your attempted explanation Russ but I'm afraid it's not clear.
The EMS? I think you mean the ECM don't you? Quote:
The HRW relay is controlled by the BCU which has no CAN bus connection. This is how the HRW works (on my KV6). The on-off button provides an earth to the BCU (C0662-5) which in turn energises the HRW relay (C0660-14). The elements supply is directly from the battery. When the external temperature is below 10°c the BCU uses that data (C0660-18) provided by the IPK on the K bus (C0230-3) also to energise the HRW relay. The IPK converts the external temperature sensor analogue signal (C0233-4) into digital for transmission on the K bus. Your mission Russ is to explain how the CAN bus allegedly fits into that straightforward scenario! Simon
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"Whatever is rightly done, however humble, is noble." Sir Henry Royce. Last edited by SD1too; 6th December 2018 at 08:04.. Reason: Additional explanation |
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