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