ESP light on and in limp

[Allan Viano]

Hi there all. Van has been running sweet as a nut since my DPF issues and then last night upon hoping up on curb ESP came on. pluged in compute and a strange list came up. Engine oil sensor defective, sensor supply 1 voltage outside of range, DPF pressure sensor dropped below and pedal value sensor low. Wow cleared and reset by disconnecting battery and plugging in computer. after short period returned...any advise will be appreciated....cheers in advance.. OOh Viano 2011 with OM 642 v6 engine

 

[AMGeed]

ESP fault is usually a wheel speed sensor or rusty reluctor ring. Check your tyre pressures too. One with very low pressure can cause a temporary fault.
You need to visit a Mercedes specialist with Star which will pinpoint the fault (and which wheel speed sensor if it is faulty)
Olly at PCS Horndean is probably your closest indy.

Mercedes Benz & Smart Specialists | Prestige Car Service | Horndean, Hampshire

www.prestigecarservice.co.uk

 

[mioba]

you wont clear the codes by disconnecting battery. They need deleting after offending item is fixed or they will come back.
forget the guesswork. a competemt MB indy

 

[Allan Viano]

ESP fault is usually a wheel speed sensor or rusty reluctor ring. Check your tyre pressures too. One with very low pressure can cause a temporary fault.
You need to visit a Mercedes specialist with Star which will pinpoint the fault (and which wheel speed sensor if it is faulty)
Olly at PCS Horndean is probably your closest indy.

Mercedes Benz & Smart Specialists | Prestige Car Service | Horndean, Hampshire

www.prestigecarservice.co.uk

Run on road diagnostic with my snap on computer, all speed sensors working in sync and tyre presures where the first thing i checked as well as ensuring no sensor disconected or pads needing replacement. My issue is I clear code and start engine and all good till I breathe on Accelarator pedal and that in Neutral.

 

[Allan Viano]

you wont clear the codes by disconnecting battery. They need deleting after offending item is fixed or they will come back.
forget the guesswork. a competemt MB indy

Fully agree but initially I could not clear codes until I disconnected battery then unit ran fine until I parked it off again and upon restart fault returned.

 

[Allan Viano]

OK. so I disconected my ECU overnight and the battery and upon reconecting I was again able to clear fault codes and unit driving full efficency again but I am sure after I switch it off and wait a few hours I will again have the ESP issues and Others as stated. let me not be preemptive I will give a follow up in a few hours.

 

[Allan Viano]

Its back... my main concern and if anybody can share any light code 124600 which states Sensor supply1 - voltage outside range....I have checked fuses....

 

[mioba]

post 2 and 3

 

[M80]

Happy to be corrected but if the wheels have moved I don't see a rusty ring as culprit.

I would be looking to identify a bad wheel sensor, or connection to whichever one is throwing up the code.

 

[M80]

It might be possible to clear,
then replicate the fault when manipulating the connectors with ignition on.
Someone monitoring the dash could be useful.

 

[supernoodle]

I'm a little confused, you say ESP light came on and have read codes but only list codes that are on ECM. Title says limp, in which case that should mean MIL/CEL should be on?

 

[Allan Viano]

I'm a little confused, you say ESP light came on and have read codes but only list codes that are on ECM. Title says limp, in which case that should mean MIL/CEL should be on?

Hi there. ESP light comes on immediately after I touch pedal but no reference to ESP on faults on computer plug in. Have run all relevent test on sensors and all appear in order and as stated I can clear the ESP issue on fault list but dash lights up as soon as I press accelerator even in neutral.

 

[Allan Viano]

It might be possible to clear,
then replicate the fault when manipulating the connectors with ignition on.
Someone monitoring the dash could be useful.

Hi there, I took a chance and checked battery voltage as I am familiar with canbus systems and voltage lower than 12.60 can cause issues. Battery voltage was 12.30 and charge rate is 13.60. I decided to purchase and install a brand new battery but to no avail...my concern is the code 124600 Sensor supply 1 voltage out of range low... Checked earth straps with ohm meter. Now thinking possible pedal assembly as when i go in through live data I only get to 62 % when pedal on floor???

 

[Allan Viano]

post 2 and 3

Have a mercedes specialist and like most he would start at a point and replace everything related to codes that are 99% of time not the culprit. Only way we learn is by trial and error and can then share relevent info to help some other person.

 

[M80]

I would expect gremlin codes at a fair bit below 12 volt battery voltage.
I'm testing mine and engine off voltage often approaches 11 volts w/o gremlins, others may be more sensitive.

 

[Allan Viano]

I would expect gremlin codes at a fair bit below 12 volt battery voltage.
I'm testing mine and engine off voltage often approaches 11 volts w/o gremlins, others may be more sensitive.

Typically yes but a fly by wire system etc and lowered cranking voltage causes dips...my experiance is on the new Hyster Fortens forklifts they are a nighmare regarding voltage as some canbus entities run on different voltages.

 

[supernoodle]

Sensor supply voltage is nothing to do with the battery supply.
ECM has multiple internal 5v supplies for the sensors and actuators. Each will supply may be 5 or 6 sensors/actuators. Each of those internal supplies will be monitored. If they deviate from the 5v it will throw an error. The main reasons why they would deviate is that one of the sensors/actuators connected to that supply or the wiring for them has gone bad and dragging the supply down. Start disconnecting those sensors that have also thrown a fault.

 

[Allan Viano]

Sensor supply voltage is nothing to do with the battery supply.
ECM has multiple internal 5v supplies for the sensors and actuators. Each will supply may be 5 or 6 sensors/actuators. Each of those internal supplies will be monitored. If they deviate from the 5v it will throw an error. The main reasons why they would deviate is that one of the sensors/actuators connected to that supply or the wiring for them has gone bad and dragging the supply down. Start disconnecting those sensors that have also thrown a fault.

hello again. I removed the DPF presure as well as the engine oil sensor and the pedal and cleared faults. however I have to replug pedal to test and then the ESp comes back on as soon as I depress it..so the question is at 125 pound for a new pedal will that clear the ESP issue or am I throwing good money after bad.

 

[Allan Viano]

hello again. I removed the DPF presure as well as the engine oil sensor and the pedal and cleared faults. however I have to replug pedal to test and then the ESp comes back on as soon as I depress it..so the question is at 125 pound for a new pedal will that clear the ESP issue or am I throwing good money after bad.

Also why would this cause a fault on engine oil sensor and lower limit value B28/20 DPF presure sensor dropped below to occur??

 

[M80]

Bearing in mind what Mr Noodle says,
if you've seen my thread

DPF Differential Sensor 'Implausible'.​

it may be worth you checking the DP wiring in case it has also suffered at the exhaust.
Different engine but is the wiring close enough to contact the exhaust?