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E888 CJC1

PostPosted: Wed Sep 15, 2021 9:38 pm
by Ralph
Hi all
running out of CAN slots on old ADL to bring in E888 diagnostics.
CJC 1 reads -53.6 on ADL
ambient temp is approx 18C
EGTS relevant (cold engine) read 17degrees C

Is that value of COLD Junction Comp 1 expected? (-53.6)


Re: E888 CJC1

PostPosted: Thu Sep 16, 2021 9:15 am
by SDean
Hi Ralph,

In the later dash CAN templates, the CJC channels have a Multiplier of 10, a Divisor of 1 and an Adder of -2000 to get the raw CAN data to align correctly, do you have this configured in your templates?

Re: E888 CJC1

PostPosted: Fri Sep 17, 2021 7:38 am
by Ralph
Thanks for your quick response Stephen.

As it turns out that in the ADL, I had allocated the CJC channel to a ExAV4(a wired but unused input).( more than a little silly)
Looks like I would need to have the expander diagnostics allocated to a CAN slot to read the actual CJC1 temp. (with your suggested multiplier and adder).

Unfortunately with the M800, and 2 PDMs I have no ADL-8 CAN slots left. Was just trying to confirm all the installation prior to have the engine running. If I need that I could reallocate a slot/ read /check/ then put back the original use. Looks like artificially changing the temp of the CJC sensor alters the 4 EGT readout temps. Thus system appears to but functioning( the CJC comp).