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Discussion Starter #21
So, today I discovered I had RAC cover at home.... so called them as the car is sat there with all the faults still present...they couldn't get it going :-( but have sent me a diagnostic report(attached). They think the issue maybe related to various things not being able to talk to the Driver Motor Control module.
Anyone heard of this particular module and where it is so I can check for obvious things like water ingress and dodgy connectors ?
TIA
Rich
 

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MY 2012 XF S Portfolio Ultimate Black
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So, today I discovered I had RAC cover at home.... so called them as the car is sat there with all the faults still present...they couldn't get it going :-( but have sent me a diagnostic report(attached). They think the issue maybe related to various things not being able to talk to the Driver Motor Control module.
Anyone heard of this particular module and where it is so I can check for obvious things like water ingress and dodgy connectors ?
TIA
Rich
Did they clear the codes first before reading?
these could show up when voltage is low but also when can bus is disturbed.
Where about is the car? You might find someone with SDD near you.
Does the engine start at all?
 

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Discussion Starter #23
Did they clear the codes first before reading?
these could show up when voltage is low but also when can bus is disturbed.
Where about is the car? You might find someone with SDD near you.
Does the engine start at all?
Hi. Not sure if codes were cleared first
Car is on drive in Kidderminster, Worcestershire
The engine doesn’t start at all. Ignition comes on. Dash and electrics all light up. Just no turn over


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It looks like the H/S can bus is down from the fault codes, as has been said it is usually battery. You need to get someone with a test meter to check the resistance between pin 6 and 14 on the OBD socket . It should be 60 ohms if it is 120 you have a break in the can bus cables. If lower you have a short or a faulty module. Any of the modules on the can bus can bring down the system which would give those fault codes. Whatever it is it is going to be technical and needs an expert to fix it with the correct tools. The way to find it will be to use an oscilloscope on the can bus to see a nice pulse code modulated signal if not, unplug modules one at a time until the PCM looks good. It could be any of the modules on the can, which could even be a faulty power or earth connection. Each module has a + 12 volt and an earth also the thin twisted can pair. I know you have said you are not technical but you may know someone who is who may be able to do the above. The module with the 120 ohm resistor at the start of the can is the instrument cluster and the end module is the engine control module I think.
 

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It looks like the H/S can bus is down from the fault codes, as has been said it is usually battery. You need to get someone with a test meter to check the resistance between pin 6 and 14 on the OBD socket . It should be 60 ohms if it is 120 you have a break in the can bus cables. If lower you have a short or a faulty module. Any of the modules on the can bus can bring down the system which would give those fault codes. Whatever it is it is going to be technical and needs an expert to fix it with the correct tools. The way to find it will be to use an oscilloscope on the can bus to see a nice pulse code modulated signal if not, unplug modules one at a time until the PCM looks good. It could be any of the modules on the can, which could even be a faulty power or earth connection. Each module has a + 12 volt and an earth also the thin twisted can pair. I know you have said you are not technical but you may know someone who is who may be able to do the above. The module with the 120 ohm resistor at the start of the can is the instrument cluster and the end module is the engine control module I think.
^ this completely
 

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Discussion Starter #26
It looks like the H/S can bus is down from the fault codes, as has been said it is usually battery. You need to get someone with a test meter to check the resistance between pin 6 and 14 on the OBD socket . It should be 60 ohms if it is 120 you have a break in the can bus cables. If lower you have a short or a faulty module. Any of the modules on the can bus can bring down the system which would give those fault codes. Whatever it is it is going to be technical and needs an expert to fix it with the correct tools. The way to find it will be to use an oscilloscope on the can bus to see a nice pulse code modulated signal if not, unplug modules one at a time until the PCM looks good. It could be any of the modules on the can, which could even be a faulty power or earth connection. Each module has a + 12 volt and an earth also the thin twisted can pair. I know you have said you are not technical but you may know someone who is who may be able to do the above. The module with the 120 ohm resistor at the start of the can is the instrument cluster and the end module is the engine control module I think.
Thanks for the explanation. I’ll pass on the advice to the expert reviewing the error codes


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Thanks for the explanation. I’ll pass on the advice to the expert reviewing the error codes
Who have you found, Richard?
 
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Who have you found, Richard?
Hi John. Techno-mend in Kidderminster came recommended. They are currently reviewing the Fault report to see if they are happy to take on the job


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Hi John. Techno-mend in Kidderminster came recommended. They are currently reviewing the Fault report to see if they are happy to take on the job


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Yes, fingers crossed! Keep us posted.

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Thanks for the explanation. I’ll pass on the advice to the expert reviewing the error codes


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Have a look here. Some symptoms are similar:
 

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Hi @RichardB , have you managed to get any progress on this yet?
 

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Hi @RichardB , have you managed to get any progress on this yet?
Hi, great question, great timing ! I had the car recovered this morning on the back of a truck and taken to Local specialist, TechnoMend-Remaps of Kidderminster. They are starting work on it tomorrow, see where the issue lies. Will keep you posted of what they find



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Fingers crossed for you.
 
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