electro power steering failure

[nooteboom]

I have a citroen dispatch 2012 and have ongoing power steering failure .I thought I would post this before I lash out £459 for a new steering wheel control module .To date I have replaced the electro pump with a re conn unit twice .So now I have to disconnect the battery for 10 secs. it seems to re sett and the steering works until I stop for 5 minuits or so then I have to go through the battery disconnect to make it work again .
Fault code the have come up are P0215,U1105,U1108,U1113.
I have had the van to Perrys citroen and they cannot say what the exact fault is as it displayed intermittent faults and there is no relevant technical bulletin available .
I have had a remote computer share with easydiagnostics Scotland and he managed to get the steering rotation fault and his sugestion was to replace the steering wheel angle sensor which he thought would be in the region of £40 .this is not the case with this paticular van with a newer system of a combined steeing control module at £450 .I have checked all the fuses in th BSI and also the underbonnet fuses .I havent touched the ECU at the moment which apperas to be under the bonnet and above the L.H. wheel with a riveted metal frame above it .
I have spoken to the company who did the pump refurbishment and they thought it would be unlikley that it was faulty but would test it if I brought it in
It may be that the original pump was never faulty at all and it was something else electronicly .
I am by no means expert with my Lexia digibox and have been trying to double check the steering agian before replacing the steering module which may not be the problem either
Any help ro sugestions would be appreciated ,Peter

[GiveMeABreak]

First off, pop your VIN up (automasked on post submission) so I can relate the faults directly to your specific vehicle.

[nooteboom]

VIN: VF7**************[VIN obfuscated, can be read by forum staff] Enterprise model

[GiveMeABreak]

I don't have any detail for fault U1108, it just says: No communication with the engine management ECU fault: No signal

Here are the other descriptors. Most of these relate to lack of network communication with the engine ECU or connections to / from it.

Fault Code:	P0215
Description of Fault:	Principal relay: Incorrect operation of the relay, the engine management ECU does not have the correct power supply. Possibility 1 Engine ECU still supplied for 2 s despite a request for cutting of its supply. Possibility 2 Loss of supply of the engine ECU for 2 s without a prior request being detected, due to an incorrect value memorised at the following wake-up.
Conditions for Fault to clear:	Driving with the engine hot for 5 minutes
Downgrade Modes whilst Fault is active:	None
Symptoms:	Starting problem
Suspect Areas:	Electrical harness Connectors Principal relay

Fault Code:	U1105
Description of Fault:	Communication: network; ESP ECU. Fault in communication between ECUs. Fault activated when at least one of the following conditions must is fulfilled: - Ignition on - Engine running
Conditions for Fault to clear:	Driving for 5 minutes
Downgrade Modes whilst Fault is active:	None
Symptoms:	Engine hesitating, cutting out Lack of power Starting problem
Suspect Areas:	Engine ECU (ECU internal failure; Communication on the network)

Fault Code:	U1113
Description of Fault:	Intersystem CAN network: No communication with the ABS or ESP ECU. Communication fault between ECUs detected for 3 secs. Fault activated when at least one of the following conditions must is fulfilled: - Ignition on - Engine running
Conditions for Fault to clear:	Driving with the engine hot for 5 minutes
Downgrade Modes whilst Fault is active:	Deactivation of the limitation of the Easy Move torque Reversible deactivation of the speed limiter and cruise control functions Replacement gear if there is a vehicle speed fault Deactivation of the air conditioning Deactivation of the request for regeneration of the particle filter from the diagnostic tool Deactivation of the injector resetting strategy Function for limitation of the static torque for the protection of the gearbox Irreversible deactivation of the vehicle speed curbing function (Need to switch the ignition off and then on, in order to make the function available again) Irreversible deactivation of the vehicle speed limiter (Need to switch the ignition off and then on, in order to make the function available again) Irreversible deactivation of the vehicle cruise control (Need to switch the ignition off and then on, in order to make the function available again)
Symptoms:	Engine hesitating, cutting out Lack of power Starting problem
Suspect Areas:	Engine ECU

[nooteboom]

Thanks for the information ,I have a note for the U1108 fault as CAN failure in BSI unit
Can you tell me where the principle relay might be located .everything else works fine ,speed limiter ,air conn .none of these faults seem to point to electro power steering motor or the steering wheel angle sensor ,but they all seem to point to the engine ECU or wiring connections .The van has only done 61000 miles and had an easy life ,now converted to a camper van.Right at the begining of the problems the ABS brake failure came up on the screen as well as power steering failure but no other messages since .the 4 control areas I have in mind are
BSI which has some relays at the bottom of it and in a realy awkward place in the drivers footwell
Steeing wheel angle sensor ,under the drivers airbag
engine ECU ,LH side under bonnet and has a metal bracket riveted over it
Power steering electric motor which has an ECU inside , LH side behind the bumper
I have looked through the forum and not seen anything which may help
there may be something or someone who has seen this problem before

[wheeler]

Can you tell me where the principle relay might be located

This is an integral part of the BSM (under bonnet fusebox)

[GiveMeABreak]

My only thoughts are that now you mention it, you may have disrupted something essential during the conversion.

You have to understand that with modern multiplexed CAN vehicle networks, less wiring is used. Most ECUs are interconnected using an 'Intersystems CAN' data network on which they receive and send digital data messages along. The master controlling computer like the BSI keeps an eye on everything in conjunction with the Engine ECU, so when there is a communication problem along the network, you can receive multiple faults coming from different systems. You may not have an actual fault with a particular system, but it can register as a comms fault which is what most of the 'U' codes are.

In the case of the ESP / ABS system, as this is a critical safety system, if there is an issue detected here, the data it is, (or is not), sending to the engine ECU means the engine ECU will deactivate certain features (as indicated in table for fault U1113), which will prevent those functions from working for safety reasons.

My first thoughts are that I don't know how far after the conversion these faults started appearing, or after any recent work you have done (especially anything wiring related), but that is where I would start looking. Did you cut or splice any wiring? If you did this can affect the equipment on the CAN network. So start retracing steps, checking wiring blocks, connections, plugs, sockets to rule out the obvious. Even check the pins on the plugs of the electrical connectors as we have seen these get mangled or damaged and therefore causing problems.

Not disconnecting the battery before undertaking any work can cause electrical shorts - so I would also check the engine fusebox and fuses.

If it's a relay in the engine fusebox, then you need a replacement fusebox as they are not user serviceable. So check the obvious first and then you may need to get it to an auto electrician who can try to localise the issue for you. Show them the fault code info above.

[nooteboom]

I am taking onboard what you are sying regarding the possible problems doing the conversion .It has a sepperate battery for the domestic supply which has pos.and neg. direct to the main battery with fused issolator and a spilt charge relay which is supposed to sepperate both batteries by sensing voltage difference and ony charging the domestic battery when it falls below 12v. giving prority to the van battery so that it would not flatten it .As i have never had any starting problems Ihave assumed it was working OK but who knows .I will disconnect this domestic supply but the damage may have been done it that all the ECU are thoroghly messed up now

[GiveMeABreak]

My thoughts are that something has happened during the conversion, though nothing is certain and you may have an issue not related to that - but it's going to be hard to diagnose on a Forum. So basic checks aside, you may need an auto electrician to take a look with the appropriate CAN testing equipment.

[Smike22]

Did this ever get fixed?
I have the same issue but this came about after i had a new clutch and starter motor fitted.

[wurlycorner]

Did this ever get fixed?
I have the same issue but this came about after i had a new clutch and starter motor fitted.

If it was from straight away after the clutch was changed, then my first suspicions would be that they forgot to reconnect something - a ground, or a connector - or they perhaps damaged/pinched or pulled a wire going to the rack during the work, all within the engine bay.