General Comfortmatic sensor

[Code Breaker]

2015 x250 3.0 Comfortmatic.

Have error P0919 - Selection and engagement position sensor

Note: I have cleaned original earth, added a new one, added a second earth to gearbox and it now shows an improvement on gearbox voltage by one volt, going to replace battery with a 110Ah.

Question: before I order this expensive sensor to replace, is there anything else to check in case fault is being caused by something else? also could the battery cause this error? I read voltages this morning after vehicle last used 24 hours before and voltage readings as attached, (with engine is running voltage is over 14 volts in engine ECU and about 12.1 volts on gearbox), any info would be appreciated, thank you

Thanks

 

[CheeseMonster]

2015 x250 3.0 Comfortmatic.

Have error P0919 - Selection and engagement position sensor

Note: I have cleaned original earth, added a new one, added a second earth to gearbox and it now shows an improvement on gearbox voltage by one volt, going to replace battery with a 110Ah.

Question: before I order this expensive sensor to replace, is there anything else to check in case fault is being caused by something else? also could the battery cause this error? I read voltages this morning after vehicle last used 24 hours before and voltage readings as attached, (with engine is running voltage is over 14 volts in engine ECU and about 12.1 volts on gearbox), any info would be appreciated, thank you

Thanks

You could try:


for help, he used to post on this forum too. He did a few videos on comfortmatic repair etc.

 

[Code Breaker]

Carrying on with the DTC P0919 - Selection and Engagement Postion Sensor.

Ok so I removed the sensor, I tested it using an Ohm meter, results as follows:

There are 4 pins labeled 1,2,3 &4
Pins 2 to 3 read 59 ohms
Pins 1 to 4 read 27 ohms
Pins 1 to 2 is reading open circuit
Pins 3 to 4 is also reading open circuit

Pins 1 to 2 and 3 to 4 should be reading up to 10k ohms, therefore I've concluded this sensor is faulty and will look to order a new sensor.

Anyone have any advice otherwise?

 

[Anthony489]

The linear inductive position sensor has two isolated windings. One connects to pins 1 & 4, the other to Pins 2&3. There is supposed to be no conduction (open circuit) between them, the spec is for the measured resistance to be Greater than 10 kilohms.

If your battery is reading over 14 volts on charge (normal) but the gearbox is only getting 12.1 volts, I would be suspicious that you have a poor connection e.g. a tarnished fuse/holder. A 2 volt drop seems excessive to me, especially as it might be more than 2 volts drop when more current is demanded during operation.

 

[Code Breaker]

So this sensor is ok then(?), the transmission error symbol and the P0919 error come up intermittently, then its still likely related/affected to the voltage at the gearbox which was worse at 11.8 till I added another earth, I will have to see where the fuses are for the gearbox and check them and also replace battery as it's a 95Ah one instead of the 110Ah it's supposed to be, then see what happens.

The reason to suspect sensor was the DTC (P0919) came up, the engine running and vehicle moving, but the gearbox voltage when DTC came up was 13.49v

 

[Code Breaker]

OK so I replaced the battery with a Brand New Varta 110Ah, took vehicle out today and gearbox wasn't happy, jumped into neutral several times but also did several things that it hadn't done before, wouldn't go into reverse, felt like clutch was depressed whilst in motion several times, it skipped 3rd and went 2nd to 4th a few times then the dreaded gearbox symbol came up. Luckily I managed to pull off into a petrol stn as it wouldn't go into any gear, then read the fault codes, cleared them and it drove home (about a mile) fine after that!..... stressed out!
Managed to get home and readings are attached.

Also did the calibration and it said 'Correct' then after ignition is turned off and back on it defaults to 'Not Performed' never managed to save it as Correct every time I try it's the same.
Readings with Engine running and gearbox in Neutral

 

[MSjoberg]

Sorry to hear that the problem persists. I dont have my Windows MES app available right now, only the iPhone version which does not provide any help text explaining what the Gearbox/clutch self-calibration actually refers to. Maybe the Windows version has a help text? If not, I would not bet it is 100% related to the procedure you have executed.

I compared your sensor readings with those I have recorded for my Ducato which has a CFC448. The values are similar but not identical, and I dont think we should expect that either. Do you have the possibility to log values while driving, and all gears being used? Enclosed are the values I've recorded, with your N values indicated in red, very approximately. (Sorry about the German text, I first made this graph for another forum)

 

[jackwhoo]

As long as it states correct after being performed I believe that is normal

 

[Code Breaker]

Sorry to hear that the problem persists. I dont have my Windows MES app available right now, only the iPhone version which does not provide any help text explaining what the Gearbox/clutch self-calibration actually refers to. Maybe the Windows version has a help text? If not, I would not bet it is 100% related to the procedure you have executed.

I compared your sensor readings with those I have recorded for my Ducato which has a CFC448. The values are similar but not identical, and I dont think we should expect that either. Do you have the possibility to log values while driving, and all gears being used? Enclosed are the values I've recorded, with your N values indicated in red, very approximately. (Sorry about the German text, I first made this graph for another forum)

View attachment 488912

Thank you for the reply. I don't know what the sensor readings mean. I will try another test run on Wednesday if I can muster up the courage and get back. I'm not sure I can log the values as I'm unsure as to how to do that and how long to run that process if I can do it.

Would you know what the reoccurring fault with the gear change sensor is please? as I wrote in previous posts I took the sensor off and measured it and as far as I can tell it is fine.

As for the self calibration, I've had this issue since I've had this vehicle (mind you I've done less than 100miles in this vehicle in over two years I've had it!) , it always shows 'Not Performed' once I 'perform' it, it shows 'Correct' then turn off ignition then back on and read it, it then reverts to 'Not Performed'

 

[Code Breaker]

As long as it states correct after being performed I believe that is normal

Hey Jack, But it immediately reverts to 'Not Performed'

 

[MSjoberg]

Hey Jack, But it immediately reverts to 'Not Performed'

Have you seen any description or other signs indicating that the Gearbox/clutch self-calibration data in the Parameters section has a 1:1 relationship to the procedure you executed? If you are not absolutely sure it is, it may be wrong to conclude that the calibration failed.
The fact that the parameter is named different than any of the calibration procedures makes me suspicious. But maybe the developer was just clumsy when labeling or translating.

 

[jackwhoo]

Hey Jack, But it immediately reverts to 'Not Performed'

Yes I noted that and was trying to indicate that may be normal .

Another forum member has suggested t that it may be clumsy program wording and I agree.

 

[Code Breaker]

So am I to understand that 'after' the calibration has been performed and the 'Correct' reading appears, and then reverts to 'Not Performed', this is normal?, does everyone else have the same on the CFC348F reading 'Not Performed' then?

 

[Code Breaker]

Have you seen any description or other signs indicating that the Gearbox/clutch self-calibration data in the Parameters section has a 1:1 relationship to the procedure you executed? If you are not absolutely sure it is, it may be wrong to conclude that the calibration failed.
The fact that the parameter is named different than any of the calibration procedures makes me suspicious. But maybe the developer was just clumsy when labeling or translating.

Forgive me I don't understand this

 

[MSjoberg]

Sorry if I confused you and maybe I have misunderstood but this is how I have interpreted your descriptions:
It is not the calibration routine itself (in MES Adjustments section) that gives you the ’Not performed’ message, but a parameter in MES Parameters section. If so, is there anything apart from an (understandable) assumption that supports the conclusion that this parameter represents the outcome of that calibration routine? If not, the parameter just might represent something else.

 

[Code Breaker]

Sorry if I confused you and maybe I have misunderstood but this is how I have interpreted your descriptions:
It is not the calibration routine itself (in MES Adjustments section) that gives you the ’Not performed’ message, but a parameter in MES Parameters section. If so, is there anything apart from an (understandable) assumption that supports the conclusion that this parameter represents the outcome of that calibration routine? If not, the parameter just might represent something else.

No need to apologise, I really appreciate any help, at this age and with what I've been through I'm all to easily confused LOL, its just that not having any experience with this means a huge learning curve and I'm not too aware of diagnostic procedures via MES or how to interpret them

 

[jackwhoo]

One member had success checking the comfortmatic wiring harness and cleaning all the connectors

 

[Jakeroyd]

One member had success checking the comfortmatic wiring harness and cleaning all the connectors

If it helps I had a poor earth on my Ducato towing relay.
It turned out to be a spring loaded connector. There was plenty of spring pressure but one side of the connector had a very lightly tarnished cable inserted.
I replaced it with a single choc block connector.
The screw was able to pierce the cable and make a good connection.
Without measuring voltage with a multimeter at each end of the connector I would never have found it.

 

[Code Breaker]

One member had success checking the comfortmatic wiring harness and cleaning all the connectors

I have run a new conduit along the wiring last year trying to eliminate this possibility

 

[Code Breaker]

If it helps I had a poor earth on my Ducato towing relay.
It turned out to be a spring loaded connector. There was plenty of spring pressure but one side of the connector had a very lightly tarnished cable inserted.
I replaced it with a single choc block connector.
The screw was able to pierce the cable and make a good connection.
Without measuring voltage with a multimeter at each end of the connector I would never have found it.

Are these fitted as standard? as I don't have any towing bar or electrics