Active damper electronic unit Fault / C5 / X7 /2011

This is the Forum for all your Citroen Technical Questions, Problems or Advice.

Moderator: RichardW

liepinnssm
Posts: 2
Joined: 17 Feb 2020, 15:03

Active damper electronic unit Fault / C5 / X7 /2011

Post by liepinnssm »

Hi all,

I am looking for someone who could help me to understand two faults I have on my C5 (X7), 2011, 2.2 HDi, 200 Hp.
Active damper electronic unit:
    P15AD
      P15AE


      Thank you!
      Attachments
      IMG_20200810_085219.jpg

      User avatar
      GiveMeABreak
      Forum Admin Team
      Posts: 21577
      Joined: 15 Sep 2015, 19:38
      x 2163

      Re: Active damper electronic unit Fault / C5 / X7 /2011

      Post by GiveMeABreak »

      Ok, so these faults are related to the active engine damping system on this engine. It's function is to minimise the awareness of engine vibration in the passenger compartment by means of an electromagnetic actuator. It is connected to the Auto Gearbox ECU, the ESP system and the BSI via the CAN network to obtain information on vehicle speed and conditions.

      The force generated by the actuator is controlled in relation to the frequency, amplitude and phase

      The active damper status as to whether it is active or not can be determined using Diagbox by checking on the ECU and confirming it's status.
      Active Damper A.PNG
      (1) Active damper electronic unit.
      (2) Vehicle vibration accelerometer.
      (3) Active damper.

      First thing I would do is check the connections between the damper itself and the damper ECU. It is a single wiring plug and may have become damaged / split causing a short.

      Fault code: P15ADActuator control fault: Open circuit, meaning the actuator control is in open circuit.

      Conditions for fault: At least one of the following conditions must be fulfilled:

      - During an initialising of the active damper ECU
      - During an actuator test on the active damper ECU

      Conditions of disappearance of the fault: The following conditions have to be met:
      - No faults for 150 ms
      - The actuator control is correct

      Down-grade modes when the fault is present: Operation of the active damper deactivated.

      Symptoms: Noise, Vibration
      Suspect areas: Connectors, Electrical harness, Active damper ECU


      Fault code P15AE Fault in the initialisation of the active damper system: Not characterised. There are several possibilities for this fault:
      Possibility 1: The automatic initialisation has failed
      Possibility 2: The manual initialisation has failed
      Possibility 3: Initialisation could not be performed

      Conditions of Fault: Engine running
      Conditions of disappearance of the fault: At least one of the following conditions must be fulfilled
      - The manual initialisation has been done successfully
      - The first initialisation has been done successfully

      Down-grade modes if fault present:
      Possibility 1: The operating is active using the default values if the first initialisation (at the factory) has not been done.
      Possibility 2: The operating is still active with the last valid value if the automatic initialisation has failed.
      Possibility 3: The operating of the damper is deactivated.

      Symptoms: Noise, Vibration.

      Suspect areas: Active damper ECU, Mass damper.

      liepinnssm
      Posts: 2
      Joined: 17 Feb 2020, 15:03

      Re: Active damper electronic unit Fault / C5 / X7 /2011

      Post by liepinnssm »

      Hi Marc,

      Thank you, this is very helpful.
      I will check the connections between the damper itself and the damper ECU.

      Mareks