Faultmate not detecting Deisel ECU

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Trevor Thompson

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I have been having trouble sterting a 1998 P38 with a Deisel engine. Had to reset the Becm memory with the engine code last week. Seemed to lose it when cranking with a low battery. It started reluctantly.

I replaced the heater plugs over the weekend (only 2 were doing anything) and started it to make sure everything was OK. Started on the first turn with a charged battery, and ran it for half an hour.

Went out today to use it and it would not start. Cranking OK - just not firing. So after a change of plans I put the faultmate onto it expecting to have to reset the code again only to find I cant communicate with the engine ecu. I can get into the BECM, and the air con computers OK, but each time I try the engine ECU I get the message that it cant get a responce from the ecu - "try checking the connections and is there actually an ECU there etc".

I have checked the engine ECU fuses, and the connectors on the ecu, and at the engine (near the infection pump. Makes no difference.

The only other thing to mention is that it has a tuning chip fitted which goes between the pump and the ecu.

Does this look like a replacement ECU - or have I missed something obvious?

Trevor
 
Trevor Thompson said:
I have been having trouble sterting a 1998 P38 with a Deisel engine. Had to reset the Becm memory with the engine code last week. Seemed to lose it when cranking with a low battery. It started reluctantly.

I replaced the heater plugs over the weekend (only 2 were doing anything) and started it to make sure everything was OK. Started on the first turn with a charged battery, and ran it for half an hour.

Went out today to use it and it would not start. Cranking OK - just not firing. So after a change of plans I put the faultmate onto it expecting to have to reset the code again only to find I cant communicate with the engine ecu. I can get into the BECM, and the air con computers OK, but each time I try the engine ECU I get the message that it cant get a responce from the ecu - "try checking the connections and is there actually an ECU there etc".

I have checked the engine ECU fuses, and the connectors on the ecu, and at the engine (near the infection pump. Makes no difference.

The only other thing to mention is that it has a tuning chip fitted which goes between the pump and the ecu.

Does this look like a replacement ECU - or have I missed something obvious?

Trevor
Click to expand...
Check the underbonnet fuse box and try an earth to the EDC.
The Power box in the cable to the FIP will not stop the Faultmate communicating with the EDC although if it failed it could stop the engine running. Good idea to remove it until you find the problem.
 
Grit Valve said:
Yes :D OBDII

Bind and dyslexic:)
Click to expand...

OBDII readers can read some engine data on the petrols, but NOTHING at all on a diesel. The diesels systems are NOT OBDII compliant. The only thing OBDII compliant on a diesel is the socket you plug the Nanocom into.
 
wammers said:
OBDII readers can read some engine data on the petrols, but NOTHING at all on a diesel. The diesels systems are NOT OBDII compliant. The only thing OBDII compliant on a diesel is the socket you plug the Nanocom into.
Click to expand...

But you can check both types sockets. Pins right ?
 
Thanks for the responces to the question.

To respond to the various points: I have been using the faultmate nano over 2 years on this vehicle. The issue can't be the OBD2 connector since it works with the other computers on the same data bus. The diagnostics system only uses pin 7 and 15 as far as I can see from the electronic fault finding manual - and they must be OK if I can communicate with the BECM sucessfully. It could of course be a problem with the 2 wires at the ECM of course.

I have just spotted that when I turn on the ignition (no faltmate connected) the engine warning light does not illuminate at all. I have looked in the manual again and that is conected to the ECM via a single wire between the ECM and the instrument panel. So I am going to point the finger back at the ECM and stick my neck out to claim that it isnt a wiring problem! I would hate to have to buy a new engine loom and fit it!

Is there any one in the South/West Wales area who can test an ECM off the vehicle?

I know Turners of Pontadawy could do it on the vehicle, but will ring them tomorow to see if they can help if I bring the ECM on its own.
 
I was referring to the nanocom evolution self test
Where you plug your green OBD Lead into your cars socket .

I didn't know weather the faultmate had this function .

 
Trevor Thompson said:
Thanks for the responces to the question.

To respond to the various points: I have been using the faultmate nano over 2 years on this vehicle. The issue can't be the OBD2 connector since it works with the other computers on the same data bus. The diagnostics system only uses pin 7 and 15 as far as I can see from the electronic fault finding manual - and they must be OK if I can communicate with the BECM sucessfully. It could of course be a problem with the 2 wires at the ECM of course.

I have just spotted that when I turn on the ignition (no faltmate connected) the engine warning light does not illuminate at all. I have looked in the manual again and that is conected to the ECM via a single wire between the ECM and the instrument panel. So I am going to point the finger back at the ECM and stick my neck out to claim that it isnt a wiring problem! I would hate to have to buy a new engine loom and fit it!

Is there any one in the South/West Wales area who can test an ECM off the vehicle?

I know Turners of Pontadawy could do it on the vehicle, but will ring them tomorow to see if they can help if I bring the ECM on its own.
Click to expand...

The wires from the ECM are connected to the BECM by splices S213 and S214 via connectors C0203, C0448, C0067 and C0229. I would suggest you look at those connectors.
 
Grit Valve said:
I was referring to the nanocom evolution self test
Where you plug your green OBD Lead into your cars socket .

I didn't know weather the faultmate had this function .

Click to expand...

Yes the Nanocom is testing the connections to the OBDII port. Just because the interface is an OBDII port it does not mean the vehicles systems are OBDII compliant. Faultmate does not have that function. It is just plug and play.
 
Just to make things plain. NO OBDII reader will access the P38 diesel systems. Will read some engine data on petrols but non of the other systems. When you first connect the FCR it reads the VIN and locks to it. If you can get into BECM with it, it is working. If you can read the BECM, Hevac Etc, but not read the ECM then one of the connections quoted earlier must be faulty.
 
Hi,

Just an update in case anyone out there is interested in what the issue was in the end.

I have replaced the Deisel engine management system. (There seem to be all sorts of acronims going round!) The faultmate (MSV2) now recognises the presence of the engine system, and the engine fault light lights and goes out as it should, but of course the engine will not start until the codes match and it is un-immobilised.

Of course the faultmate also identifies that the software is not licenced to access this new unit, and I am now trying to get the licence changed. Without the licence I cant find the immobilisation code in the engine management unit and change the one in the BECM.

I am sure that it will all be OK in the next few daya!!!

Trevor
 
Trevor Thompson said:
Hi,

Just an update in case anyone out there is interested in what the issue was in the end.

I have replaced the Deisel engine management system. (There seem to be all sorts of acronims going round!) The faultmate (MSV2) now recognises the presence of the engine system, and the engine fault light lights and goes out as it should, but of course the engine will not start until the codes match and it is un-immobilised.

Of course the faultmate also identifies that the software is not licenced to access this new unit, and I am now trying to get the licence changed. Without the licence I cant find the immobilisation code in the engine management unit and change the one in the BECM.

I am sure that it will all be OK in the next few daya!!!

Trevor
Click to expand...
I'm not aware that there is a licence problem with changing the EDC, the VIN is held in the BECM which the Faultmate checks before allowing access.
 
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