Ok so here's the story, really need some help from someone that knows more about these than I do. Bought this as a project, did not run. Had been sitting for 5 yrs. Has no spark and no injector pulse. Here's some info:

Have power to the coils 12v
Have ground (the constant one)
5v ref reads 4.87 with key on
No pulse.
Have sent the computer off for testing and they said it's working like it should.
Have replaced the crank sensor (and bench tested)
950cca battery. 12.6 and 10.7 cranking
Gear indicators light up
Have several codes on the dash:
Trac not available
Asc not available
P0197
P0706
P1642
P1638
P1224

Have been working on a doing a pin out on the ecm but have not finished, have confirmed good many powers, haven't done grounds. (My wiring diagram is a pain lol)

So on my list to check is
Can sensors
Ecm pin out


Any and all advice appreciated

 

How old is the battery?

 

Near brand new. Pulled out of another vehicle to test with a newer battery. The one it came with the car when cranking was 9.6v.

 

The DTC codes that you posted (P1224, etc.), do those same codes immediately reappear each time after you have done a hard reset (battery disconnect, touch battery leads together, reconnect battery), or cleared the codes?
- a poor battery will cause the engine management unit to throw huge amounts of false errors, hence the advice to ensure an excellent battery as first step.
- the ECM is extremely reliable, so I would try and get repeatable error codes from it, and see where that leads to start with. Tough to figure out where to start.

I imagine after sitting 5 years the fuel system was in a pretty bad state, and you have cleaned it all up.

One (of a myriad, at this stage) of possibilities:

P1224 is the nastiest of the DTCs you listed (IMHO), and is a throttle position sensor (TPS) error. If that, or the pedal position sensor (PPS), are not working well you could have a really hard time getting the engine to start.
I would suggest checking the TPS operation, and that the throttle plate actually moves.
Get the AJ26-27 ecm 881 Manual (e.g. from jagrepair.com, under Xk8 > Jaguar training guides) and review the material on TPS and PPS output curves - and try to validate they are working ok.

 

I have not done a hard reset since the new battery was put in. I will do that tomorrow. Do you think the throttle issue could cut off fuel injectors and spark all together? I definitely see it as an issue but curious if it could effect spark etc. First time working on a car like this. This ain't no mustang lol
Yes fuel tank has been flushed and new pump installed, not currently plugged in while I've been hunting down the spark issues.

 

Have you checked the inertia switch?
Power to the Throttle relay, fuel injection relay, fuel pump relay, coil relay, ems relay?
Engine crank signal from the BCM?

 

If it's been sat for that long, it's worth checking the wiring for rodent damage, just in case.

 

Why was it left sitting for 5 years in the first place?

If you have fuel, and if the switches on the J-Gate are ok... it should start huffing and puffing..

Btw, have you checked out the channel "To The Garage" in the youtube... he was dealing with exact same ting what you are dealing with now. :-)

 

The inertia switch is not tripped
Coil relay only is for the power or the 12v sent to the coils, correct? If so I have that power. Only thing missing for spark is the pulse ground from the PCM if I'm looking at this right. I have not checked
Throttle relay
Fuel injectors relay
Ems relay (never heard of it lol)
Also could you expound on the bcm crank signal? Where is it and can I do a connector back probe to test?

 

The 4 pins on coils are; power from relay, ground, pulse signal from ECM and pulse (5V on/off) feedback to ECM
I wrote crank signal, but I was thinking security signal. There are two signals from the key transponder module. Security OK and OK to start. I dont know what happens if you dont have those. Maybe it wouldnt crank? Or maybe it cranks but dont fire coils and fuel injectors?
Next step would be to check if you have signals from crank and cam position sensors. But I assume you dont have an oscilloscope?

 

I don't have an oscilloscope. I have tested both the cam sensors and the crank sensors, all are producing voltage when passed over magnetic object. Have also tested them installed and same result, there all making voltage.

Far as the transponder module, how would I go about testing that? Any idea what signal it sends to the ecm? Maybe I could bypass it to confirm?

 

Judy skipped through his videos. Yeah pretty much at the point I'm at, I need a part 7 like yesterday lol

Can the j gate cut off spark and fuel if it's still lighting up the gear selector light? It also rapid beeps when I put it in drive or reverse with key on. Sounds like it working but Im questioning everything now

 

Yes and I've found some small signs. I have been doing continuity checks to look for any places wires might be touching. I've looked at what I can see from the engine bay for any damage on main harnesses

 

Are you sure it's not simply a fuel pressure related problem? Have you tried starting the engine with the fuel pump connected?

 

Put an inline spark tester in and no spark, no ground pulse signal being sent by ecm

 

On the later 4.2 I believe if there is a P1224 code the ECM will shut down the engine and not allow it to start. Don't know if this applies to your 2001 but a good chance it might.
Worth checking if the throttle butterfly/motor is moving/actuating OK

 

Oh I've got some hope now. Anyone have recommendations on a test procedure?

 

I would definitely start by checking all your fuses and relays and make sure you have power and ground where you expect it to be at the throttle body. This is what the DTC Summary says trigger P1224:-

• Throttle adaptions not performed after battery disconnect
• TPS disconnected
• TPS to ECM sense circuits:
• open circuit, high resistance
• Throttle motor power relay failure
• Throttle motor power relay to ECM circuit fault
• Throttle motor power relay power supply: open circuit
• ECM ground circuit fault (relay coil drive)
• Throttle motor to ECM drive circuit:
• open circuit, short circuit, high resistance
• Throttle motor failure
• Throttle assembly failure

It also says that a P1224 will put you in limp home mode:-

When RED MIL is activated
(DTC logged; first trip), ECM:
– Switches off throttle motor
(via relay)
– Initiates throttle “limp home”
mode: engine speed controlled
to between 1000-1250 rpm by
fuel cutoff to cylinders
– Inhibits idle speed control
– Inhibits cruise control
– Inhibits traction control / stability
control

 

What is the red security light on the dash doing? Maybe a security issue is preventing starting
.
.
.

 

Hey everyone, here's an update

After some recommendations to hunt down the tps issues/codes found that the input to the ecm from it is sending no voltage. None at all. Connecter em81. Thoughts?


I'm stupid, have to back probe lol was thinking its input so can unplug, nope. Here's what I'm getting
All on connector em81

9 - idle .58 full throttle 3.15v
10 .86 idle to full throttle no change
18 idle .58 full throttle 3.15
19 1.6v no matter imput

10 and 19 are supposed to be moving and are not.
The others are close but not at spec