xk8 will not start

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xk8 will not start

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xk8 will not start - 4/8/2008 7:26:07 AM

redhounds1

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Joined: 4/8/2008
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I have a 1997 xk8 non supercharged that will not start. Good battery voltage, fuel pressure at about 45 psi, mass air flow sensor responding on OBDII monitor mode testing. Coil connector voltage seems o.k. on passenger side but no voltage on drivers side when checking with a digital meter. Voltage check is being performed at the connector plug terminals at each coil. This car was running fine and then will not run. Any suggestions would be greatly appreciated. If any more info needed just let me know. THANKS

Post #: 1

RE: xk8 will not start - 4/8/2008 12:56:55 PM

jag_genius

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have you got spark on both banks..?

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RE: xk8 will not start - 4/8/2008 1:47:01 PM

redhounds1

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Joined: 4/8/2008
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I have no spark. If we are checking it correctly, maybe you could lend a hand on correct procedure. I would greatly appreciate any help. We originally removed the coil, installed a plug and cranked the engine---no spark at plug. Thanks again for the help.
redhounds1

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Post #: 3

RE: xk8 will not start - 4/8/2008 4:56:20 PM

FactoryJaguarTech

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You can also get a coil on plug tester....just place it on the coil and will tell you if it is firing.

Do a hard reset (disconnect battery 5 minutes) see if it then fires up. I always try the hard reset first....lol

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RE: xk8 will not start - 4/8/2008 11:54:47 PM

JagtechOhio

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Joined: 3/12/2008
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Greetings Red,

Maybe you don't have any DTC codes stored, it seems you would have P0300, or P0351 thru P0354, or P0355 thru P035. That would show either random missfire or one bank of dead coils.

Both ignition modules, and the coils, are powered through one relay. So that's out of the equation.

The two modules are the same, LJA1450AF. I verified this on a parts car, and checked if there was enough wiring harness to see if you could switch connections between the two: no problem.

Try that, and the live bank and dead bank should now be switched also. If that test does not identify a bad ignition module, then you have a wiring harness fault or no signal to the dead bank's module from the ECM. Hope for the module. Good hunting!

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Post #: 5

RE: xk8 will not start - 4/9/2008 5:21:17 AM

redhounds1

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Joined: 4/8/2008
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I have hooked up an OBDII diag tool and the only code i get is p1000. Something about not all readiness tests completed. No other codes came up. Thanks again for your post, very helpful.

redhounds1

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Post #: 6

RE: xk8 will not start - 4/9/2008 5:55:54 AM

JagtechOhio

Posts: 477
Joined: 3/12/2008
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Hey Red,

Unless your ECM or dianostic socket is brain-dead, you will always get either P1000 or P1111. That just tells you the lights are on, and whether or not somebody is home.

Try switching the modules.

Please let us know what you find.

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Post #: 7

RE: xk8 will not start - 4/9/2008 11:04:32 AM

redhounds1

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Joined: 4/8/2008
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We have switched the module connecting wiring harness from one side to the other and the power remains on the passenger side. Still no power to the drivers side. Does this mean that the wiring harness to the coils on the drivers side is bad ??? PLease advise. Thanks again---alot
Redhounds1

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Post #: 8

RE: xk8 will not start - 4/9/2008 1:30:01 PM

JagtechOhio

Posts: 477
Joined: 3/12/2008
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Sounds like you need to purchase a wiring diagram.

On Figure 04/02 of mine, for 1997 N/A Engine management, the power feed is from the ignition coil relay and splices off to power both of the ignition modules and all eight coils. All of these wires are Purple/ white, they all should have 12V with the key on, and yours probably do. I didn't look this far, but I presume that you could test each coil PW wire for continuity to ground (short) by turning off the key, disconnecting the ignition module, and testing.

The other wire to each coil is as follows:

B (left) 1: Green/ black
2: Green/ red
3: Green/ orange
4: Green/ purple

The diagram shows these ECM- controlled ground wires as running directly from the B bank ignition module directly to each coil. The only intermediate point of connection is P11, pins 43-46. I did not find P11 in the wiring diagrams, and I am looking on my WDS to identify it positively. I suspect it is the big Sumitomo block connector for the engine wiring harness. Those spade terminals can corrode, I clean them with contact cleaner and a flexible emery board that I stole from my girlfriend's manicure toolbox.

Test each Green/..... wire from module connector to coil for continuity and short to ground also, hopefully you will find a problem.

Andrew Bernstein

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Post #: 9

RE: xk8 will not start - 4/9/2008 3:01:36 PM

JagtechOhio

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Joined: 3/12/2008
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Hey Red,

My mistake, it is connector PI1, not P11. That is shown as PI001 on the WDS, which is the big black Sumitomo connector I was talking about. Not much more I can do without looking at the car for myself, good hunting.

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Post #: 10