Hello all, this is my first post. I was a professional land rover technician from 2006 to 2016. Factory training ect. I am from Oregon but moved to California about a year and a half ago. yay, intro done.

So i am working on a 2004 XJ8 with ECATS. Somebody swapped in coil springs which is fine, but they merely unplugged the module. This causes a P167x (i cant remember but its the one for CAN fault to suspension module) which I'm pretty sure will cause me to fail SMOG. Arnott will not sell their bypass module separately, Strutmaster will, for $400.

Now the Arnott module splices in to a power and a ground, then two other wires. I know that on Rovers of a similar vintage u can usually power and ground a couple wires then the module goes in to manual mode, is there a similar bypass for this vintage? I have all the factory diagrams if anyone knows which wires to splice where, i just need pin numbers.

Now I am fairly new to California and not well versed in the SMOG laws. There is some speculation that this fault is not an emissions fault and thus will not cause a fail. When the module was unplugged we had parking brake fault, but this appears to be a failed brake cable, parts here shortly.

I will pay the $400 to fix this right, its not a big deal. But after looking at what the modules are I have a feeling it is like the old Atlantic British "module" that was a fancy box around direct splices. I just dont wanna pay $400 for a fancy box.

I love fun discussion, but please keep from posting shade tree speculation. Modules aren't cheap and you cant put the magic smoke back once its out.

Thanks everyone

 

Take a peak at post 13 here:
https://www.jaguarforums.com/forum/x...ersion-110745/

 

Thanks Sean! I did come across that post. Or maybe just leaving the height sensors in and using a resistor for the compressor, then calibrating to current height. I would rather buy the module though I think. my experience makes me concerned about loading the trunk, if the ecu cant level it logs a fault code.

 

Hi BangoSkank,

Welcome to the Jaguar Forums!

Sorry in advance for this rambling post - it's too late at night for me to edit it for brevity.

I can't answer your questions directly, but I can offer some peripheral info that may help you figure it out.

The first time I installed an Arnott coil conversion kit, I attempted to measure the circuits inside the sealed Electronic Bypass Module (EBM). I measured for resistance and diode function across each combination of wire pairs, but with no definitive results. I think I recall that I measured 150 ohms across a couple of the terminals, but couldn't get any other measurable results, and I may even be wrong about the 150 ohms.

To see which wires the EBM connects to, see pages 9 and 10 of the instruction manual available at this link:

http://arnottinfo.com/manuals/C-2745.pdf

To see how these wires relate to the ASM circuit, see pdf page 77 of the Electrical Guide:

2004 Jaguar X350 Electrical Guide

Now that I think about it, the ASM sits at one end of the CAN network, so the resistance I measured was probably 120 ohms, which is the value of the termination resistors in the CAN network. At the other end of the CAN network is the Engine Control Module, which has its own 120 ohm termination resistor. The 120 ohm termination resistor in the ASM connects across the Yellow and Green wires which connect via pins 7 and 8 of what the Electrical Guide calls a black connector, but which must be the yellow connector shown in the Arnott instruction manual. Replacing the termination resistor in the ASM with one in the EBM would prevent at least one CAN fault code from being flagged.

That leaves the Brown/White stripe (NW) wire and the Black (B) wire. According to the Electrical Guide, the NW wire carries battery voltage via the Transit Isolation Relay (TIR), which is adjacent to the battery in the trunk. The B wire connects to ground below the right rear seat. So the question is, what does the EBM do with that battery voltage and ground? Surely it doesn't simply connect them together, or the 20A fuse in the TIR would blow. It appears the NW battery power is subject to a Timer circuit in the TIR - I wonder if that has something to do with it?

I hope this helps you figure it out and that you will share your discovery with the rest of us!

BTW, I thought that only Powertrain (P) codes could cause an emissions test fail, or does California check for mechanical safety issues as they do as part of the MOT testing in the U.K.?

Cheers,

Don