Could someone clear this up for me. Looking at the attached schematic, Is the main connector the plug from the injector harness side or the plug on the main harness side on the car?

 

"View = wire side"

I interpret that as being the connector on the F.I. harness itself. Not the connector on the harness in the car

Cheers
DD

 

Thanks, Doug. I am making a new FI harness. I am just waiting for the FI connector plugs to come in.

 

Looking at the diagram in Post #1 and comparing it to the attached pics, it looks like the diagram shows the plug from the harness coming from the car not the fuel injector harness.

fuel injector harness plug

this is the plug on the harness in the car
This looks like the plug shown in the diagram above. If I turn either of the 2 plugs they will not be correct.
Since I am building a new FI harness, I will connect the plugs and mark the appropriate wires for each injector and bank. The harness I am making will have the A bank and B bank separated for diagnostic purposes later on. What do you all think about that.

 

Yeah, I guess my wording on that diagram isn't super clear. The idea is looking at a plug as if you were inserting the wires into it's backside.



BTW, Andreas Eckert in Switzerland is now offering / making a stunningly GOOD looking harness with Tefzel wiring, and a 3D printed connector that matches the OE one, along with a choice of coverings and a new wiring diagram to include in your manual. It may not look exactly OEM, but it should last in the engine bay much much longer than an OE replacment - e.g. SNG Barret - and for about the same cost

.











~PK

 

Thank you for clearing that up. Appreciate it.

 

FerrariGuy,

Do you have a link to Andreas' website? I want to get an injector harness made for my pre-HE.

Tks

Paul

 

I'm not sure if he's got a template for the preHE (assuming it is different) though I'm sure he'd like to be able to make them. AFAIK he has no website setup *YET*. He's on FB and in many of our XJS groups (beware it's mostly the OLD groups that are legit, many of the new ones are created by scammers for scammers). AFAIK he's not YET on these forums - at least findable by his name. I can ask him and suggest he makes a profile so he can be contacted. His FB ID is: andreas.eckert.71

You can also see an unboxing of the entire harness for use by Bob Knodt @ the Camp Chaos YT channel:


~PK

 

The pre-HE harness is different. The injector connectors are different, and it interfaces with the injection amplifier which the HEs don't have.

Jon

 

Hello everyone,
Did I hear my name?
As already mentioned by Paul, at the moment I do not offer the pre H.E. version of my uprated harness. However, if someone is interested in it and not under extreme time pressure, I would be more than happy in working together with him to get this project realized in the same high quality as the H.E. harness.
The harnesses I offer at the moment will work with any H.E. that has the Lucas ignition system (1980-1989).
I also do not have a website yet as I manufacture these harnesses in small batches.

Andreas

 

Are you dead sure about that?

Granted I don't have direct exp with a pre-HE other than diagrams pics etc, but lets take Bernard Embden's old 1979 D-Jet XJS V12, for which he rebuilt the harness:
https://bernardembden.com/xjs/fiharness/index.htm

His pinout is EXACTLY the same as the HE connector. Those are EV1 style injectors (yes the flow rate is different but the body is the same).
The pre_HE does have the additional cold-start injectors, with EV1 connectors, but those I believe are another attached harness, or bundled in with the EFI harness, but not wired in.

Lets have a look at the D-Jet Injector Amp and wiring - at least as pictured by 1979 V12 pre-HE XJS owner Bernard Embden:



Pre-HE Injector Amp



Pre-HE Injector Amp Connector(s) - 4 pin should be the 2 channel control from the 3CU ECU D-Jet ECU.



Pre-HE Injector Amp Connector(s)




HE Pinout (above)







Pre-HE illustration (above)

Pre HE pinout numbered - same as HE pinout.





1979 OE XJS V12 EFI Harness End





1979 OE XJS V12 EFI Harness





Looks to be the same connectors




Note Bernard sourced the WRONG style connectors and had to cut them (the push-spring-clip release style) rather than the correct low-profile ones as Andreas uses.




Same connector... Bernard here holding the additonal cold start injector routing.






I'd like to know more, but it would make sense to me that Jag re-used the base harnesses from the D-Jet cars when they went to the P-Jet system. Much cheaper and they were in a cash crunch. I've definitely seen extra unused injector connectors on harnesses laying in the valley of VERY early HE's suggesting they just pulled existing harnesses from the parts bin leaving the cold start injector connectors unused.


~PK

 

Injector connector and boot:



HE connector and boot:

Cold start valve wring is part of the harness:


I don't remember this ground as part of the HE harness, but I may be mistaken:

The main plug is the same for the cylinder injectors.
HE injector connectors won't fit pre-HE injectors as the connector on the injector body is physically different.
Pre-HE;

HE:

So, in summary, as a minimum, he'd have to change all of the injector connectors and add all of the cold start valves wiring and connectors. You are correct that the main harness connector is the same, which is a plus.

Jon

 

Ahh yes I see now. I had indeed forgotten about those early odd style connectors. Thanks for clarifying for me/us!

Interesting the pre-HE injector receptacle is *almost* right, just has no bosses to click-lock the EV1 connectors

So the pre-HE injector would have used a combo of these items for terminals:





Ahh. and as can be seen from the side, the D-Jet injector has a rim around the top edge:




I guess the connectors are maybe more pricy to source but WUF!

One of the Pre-HE harnesses currently on the market:

https://www.britishwiring.com/product-p/xj2212.htm

Pricy!

~PK

 

After reading all of the posts, I just need to clear things up. The FI harness is the male and the car harness is the female

Fuel Injector harness (MALE)

Harness on car (FEMALE)
Which one is indicated in the diagram in Post #1. The male side or the female side.

 

Sachez, this should help. See last page in particular. In Post 1 above, you are looking at the back of the male plug on the injector loom as the wires enter it coming from the injectors. This view is, of course, the same as looking into the front (ie interface joint) of the car loom female plug.

 

Thanks Greg. Your post made it very clear for me to understand. Just what I needed. I will be splitting the harness in two using two 4-pin connectors from DEL CITY. These 4-pin plugs also fit the Marelli coils. I had to replace both of them since they were falling apart. Thanks again.
I am in the process of double/triple checking everything before I attempt to start the engine.
Also do you know where I can find the part numbers for the cheaper aftermarket Crank Position, Engine Speed sensors and the two Ignition Amplifiers? You never know with these cars.

 

Sorry I didn't get back you but Greg's expansive document really helps flesh things out.

BTW for some words on the AMP module:

https://forums.jag-lovers.com/t/xj-s...-contd/332366/

Re the VR sensors, AFAIK all years are interchangeable at the sensor end... that is to say, the connectors varied by the year, and that's the main thing you sometimes have to sort out if you can't find one with YOUR connector. I would suspect that most VR sensors would actualy work IF spaced from the reductor ring properly. One day perhaps we should document the dia and depth of the VR sensor and then if some ABS sensor or GM VR sensor turns up that physically fits... try that...


~PK

PS:
@Greg:
Suggestion for your PDF: You might modify or make note of, so that it's clear, that the ECU itself is a 2 channel unit. A & B bank. The outputs of each bank are fused as a unit on the PCB itself. So although although there's multiple pins for the open, or hold session, those are really all ONE output. So I suppose you could call it 4 outputs. An OPEN on A, a HOLD, on A, and an OPEN on B, and a HOLD on B. (Though injectors are grouped external to the ECU).