Non-starting '8 with "Engine fault" message but no DTCs
#41
#42
I will pull the BPM and have look for anything obvious, and will check its earth etc.
I can see the errors for the BPM but I didn't think the BPM would prevent fuel/spark. According to the advanced electrical guide, the BPM would prevent cranking from happening - but that's not the case for my car, it cranks fine, it just doesn't get fuel/spark.
But I will pull the BPM out to take a look.
http://www.jagrepair.com/images/Trai...s/680_1998.pdf
I can see the errors for the BPM but I didn't think the BPM would prevent fuel/spark. According to the advanced electrical guide, the BPM would prevent cranking from happening - but that's not the case for my car, it cranks fine, it just doesn't get fuel/spark.
But I will pull the BPM out to take a look.
http://www.jagrepair.com/images/Trai...s/680_1998.pdf
A fast test for correct communication between BPM and SLM is to open the fuel filler flap, if it works (releases) communication bus should be ok.
Last edited by toaster; 01-11-2018 at 10:50 AM.
#43
Thanks Toaster, it does indeed work just fine, filler flap opens perfectly. Apart from lack of fuel/spark, there is nothing else on the car that doesn't work - except one LED in the instrument cluster (the green one for headlights).
By way of update, I pulled the instrument cluster (hoping to see something obvious like failed solder or capacitor) but it is visually fine.
Just waiting on a replacement '97 version of the KTM to arrive (ETA Saturday). If that doesn't work, I am going to check the BPM (visually) but I still have my doubts about the BPM as it is mostly concerned with cranking (which my cars fine) and not so much fuel and spark (which is failing on mine).
By way of update, I pulled the instrument cluster (hoping to see something obvious like failed solder or capacitor) but it is visually fine.
Just waiting on a replacement '97 version of the KTM to arrive (ETA Saturday). If that doesn't work, I am going to check the BPM (visually) but I still have my doubts about the BPM as it is mostly concerned with cranking (which my cars fine) and not so much fuel and spark (which is failing on mine).
Last edited by franksm; 01-11-2018 at 11:39 AM.
#44
#45
Unfortunately the inertia switch is okay - and it enables a huge number of circuits (which are all fine) and cuts the starter motor relay from working (which would stop cranking from happening). I think the inertia switch created P-codes as well.
If only it was something that easy-to-get-to
If only it was something that easy-to-get-to
#46
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Still stumped with this one. Going through the pin-point tests in the '99 version of the workshop manual, it asks to check that the KTM is getting an ignition-switched-negative signal on pin 13 of the connector (FC22) - a white/red wire.
This is failing for me, the resistance is huge.
This is failing for me, the resistance is huge.
#47
No, it turns out that that's a logic signal from the BPM - so it may be okay for that split second that the KTM is lit up to read the transponder within the key (which it does just fine). The fact that the car cranks is important. If it failed to crank then the problems would be much more obvious. Electrical guide says the following.
All of the crank parameters are checking out okay, it's whatever is supposed to set the injector and coil parameters - that initial startup phase is missing. Don't know if that's BPM or ECM, it sounds like ECM.
Anyway, I will try the replacement KTM at the weekend because it's an easy thing to try.
All of the crank parameters are checking out okay, it's whatever is supposed to set the injector and coil parameters - that initial startup phase is missing. Don't know if that's BPM or ECM, it sounds like ECM.
Anyway, I will try the replacement KTM at the weekend because it's an easy thing to try.
#48
No, it turns out that that's a logic signal from the BPM - so it may be okay for that split second that the KTM is lit up to read the transponder within the key (which it does just fine). The fact that the car cranks is important. If it failed to crank then the problems would be much more obvious. Electrical guide says the following.
All of the crank parameters are checking out okay, it's whatever is supposed to set the injector and coil parameters - that initial startup phase is missing. Don't know if that's BPM or ECM, it sounds like ECM.
Anyway, I will try the replacement KTM at the weekend because it's an easy thing to try.
All of the crank parameters are checking out okay, it's whatever is supposed to set the injector and coil parameters - that initial startup phase is missing. Don't know if that's BPM or ECM, it sounds like ECM.
Anyway, I will try the replacement KTM at the weekend because it's an easy thing to try.
Maybe it is something like in this thread: https://www.jaguarforums.com/forum/x...k-71752/page5/
Last edited by toaster; 01-12-2018 at 05:49 AM.
#51
Not yet - I have a replacement ECM coming this week, but will have to wait for the snow to stop here before pushing the car outside (the cylinders have oil in them from compression testing so if it does happen to be resolved, it needs to be done outdoors!) so I doubt I will have news until the weekend.
The ECM was a cheap and easy thing to replace, and doesn't need coded as it's coming with a matching KTM and transponder key. So if this doesn't solve it, it's off to the experts. I don't have software to code in a replacement BPM, in case that it the issue as mentioned by a few here.
The ECM was a cheap and easy thing to replace, and doesn't need coded as it's coming with a matching KTM and transponder key. So if this doesn't solve it, it's off to the experts. I don't have software to code in a replacement BPM, in case that it the issue as mentioned by a few here.
#52
Just a possible suggestion...
I had this same problem a couple of years back - I drove my XK8 to the pub for lunch with no problems at all. Got back in an hour later turned the key and continuous cranking with no sign of any fuel. Also accompanied by an engine fault message on the dash.
After weeks of research and trials I happened to be sat cranking over and noticed that the gear shifter had not fully located into the P position. This was only apparent by the absence of the illuminated P.
I gave the shifter a wiggle, the P illuminated and hey presto she fired straight up!
So worth a check!
Good luck
I had this same problem a couple of years back - I drove my XK8 to the pub for lunch with no problems at all. Got back in an hour later turned the key and continuous cranking with no sign of any fuel. Also accompanied by an engine fault message on the dash.
After weeks of research and trials I happened to be sat cranking over and noticed that the gear shifter had not fully located into the P position. This was only apparent by the absence of the illuminated P.
I gave the shifter a wiggle, the P illuminated and hey presto she fired straight up!
So worth a check!
Good luck
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franksm (01-17-2018)
#53
The Auto Enginuity code description differs from the Jaguar one:
https://www.jaguarforums.com/forum/a..._2003range.pdf
The ignition switch is really ok?
B1595 is weird.
https://www.jaguarforums.com/forum/a..._2003range.pdf
The ignition switch is really ok?
B1595 is weird.
Last edited by toaster; 01-17-2018 at 06:26 AM.
#54
Yeah - I took the back off the ignition switch and measured what happens when the key turns, all okay. And the wiring looked fine, no damage. I checked upstream of the ignition key and various items were getting signals from the ignition mech.
I know that people have had problems with the gearstick/shift with B1595, but mine checks out fine as far as LEDs go, and some live data from Autoenginuity. Also, it cranks but doesn't fire in neutral just as it cranks/no fire in Park
I know that people have had problems with the gearstick/shift with B1595, but mine checks out fine as far as LEDs go, and some live data from Autoenginuity. Also, it cranks but doesn't fire in neutral just as it cranks/no fire in Park
#55
#56
#57
#58
All ideas welcome
I took a look under the column, everything is tight and buttoned up. Ran a few continuity tests and all were fine.
I am hoping it's not the BPM as that's one thing I can't fix (needs coded) so am getting everything else out of the way. BPM is last resort. It looked okay from what I could see, and its connections were tight and clean.
This weekend will tell (replacement ECM arrives)
I took a look under the column, everything is tight and buttoned up. Ran a few continuity tests and all were fine.
I am hoping it's not the BPM as that's one thing I can't fix (needs coded) so am getting everything else out of the way. BPM is last resort. It looked okay from what I could see, and its connections were tight and clean.
This weekend will tell (replacement ECM arrives)
#59
#60
I have that disabled, but the column returns to a parked position whenever the battery is reconnected - I know this because I have to extend the column in order to take the cowlings off the steering wheel/ignition.
Fob works perfectly, locks and unlocks, alarm chirps as normal, deadlocking also works.
Fingers crossed for ECM still but I get the point about WDS (and BPM) !
Fob works perfectly, locks and unlocks, alarm chirps as normal, deadlocking also works.
Fingers crossed for ECM still but I get the point about WDS (and BPM) !