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Unhappy 612 - Suspension control system failure and engine control failure

Discussion in '612/599' started by Diny, Sep 12, 2021.

  1. Diny

    Diny Karting

    Jun 24, 2017
    68
    I'm looking for a bit of guidance in troubleshooting this. The car is a 2005 612 with 25k miles. Here we go:

    This started just over a week ago when, after driving the car quite a distance on a Friday, found the battery completely drained 2 days later. In summer I drive enough to not have to put it on a battery tender, but the battery being drained in 2 days is the main reason why I have a theory as to what this problem might be. Still, didn't drive the car until a week later (car was left on the battery tender just in case).

    Car drove fine to work (a 30 mile trip) and then, on the way back, things started going downhill. On a somewhat bumpy highway, I got the suspension control system failure light. Car didn't feel any different, and I was on my way home already. A few moments later (maybe a minute or two), the engine control system failure warning joined the party. I pulled over and restarted the car just to see if this was a matter of resetting. It wasn't. What I did notice is that the car hesitated to start moving. I'd give it gas and it wouldn't raise revs much. Then it would hook up and chirp the tires. Once the car was moving, there was no bad behavior at all.

    Once home, I started with the simple stuff: Checked the battery. It was 6 years old. Figured it's time to change it anyways. Even after resetting the ECU (as per the owner's manual), the suspension control system light would come on soon after starting the car with the engine control system failure being added a few moments later. It's worth noting that after resetting the ECU and starting the car back up, the car would start moving just fine until the suspension control system warning would come on. The behavior (having trouble starting to move) applies in 1st and reverse as well as in manual and automatic modes.

    My current hypothesis is that I have a bad relay somewhere that drained the battery quickly and is causing all this. I'm not overly familiar in where to start looking, so any help would be appreciated. I'd like to see if I can tackle this on my own first (especially if it's as simple as a relay or fuse) before taking the car to a shop.

    Thanks for the help!
     
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  3. F612

    F612 Formula Junior

    Feb 5, 2018
    497
    Leeds,AL
    Full Name:
    David D. Hood
    Replace the battery first. Problem may go away.
     
  4. Diny

    Diny Karting

    Jun 24, 2017
    68
    Sorry for not being clear. I replaced the battery already.
     
  5. brogenville

    brogenville Formula 3
    Silver Subscribed

    Apr 24, 2012
    1,145
    UK
    Full Name:
    Robin
    You have any means of reading the codes for us?


    Sent from my iPhone using FerrariChat
     
  6. Diny

    Diny Karting

    Jun 24, 2017
    68
    Only codes I get is P1093 twice (so clearly nothing useful). If I clear the codes, I have a few seconds until the suspension warning comes back and, during that time, the car gets moving no problem. I'll have to bite the bullet and take it to the shop. I couldn't find a parasitic draw, as my test showed only 35 milliamps being drawn when the car was asleep. I'll certainly post updates when I can.
     
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  8. mcw

    mcw Karting

    Aug 10, 2008
    56
    Have you checked for mice or rats eating some of the wiring?
     
  9. brogenville

    brogenville Formula 3
    Silver Subscribed

    Apr 24, 2012
    1,145
    UK
    Full Name:
    Robin
    This is a powertrain fault code, so presumably its from the engine ecu; have you/can you scan the suspension module?
     
  10. Diny

    Diny Karting

    Jun 24, 2017
    68
    Any idea how I can do that?

    The thought crossed my mind last night so I set some traps in the garage. The car's not the only one in the garage, so if this is the case then it's clearly a rodent of taste and class!
     
  11. brogenville

    brogenville Formula 3
    Silver Subscribed

    Apr 24, 2012
    1,145
    UK
    Full Name:
    Robin
    OK, so if you have a running issue and the suspension light is on, then its crucial that you scan the suspension module to see whats going on. The low cost go-to tool for me is the Autel AP200; I bought one for £50 a couple years ago and it gives you lifetime access to all modules for a given manufacture. You can do a bunch of special functions on mainstream cars (sadly none for Ferrari), however it will read and clear codes on every ecu as well as allow you to see the live ecu data.

    Either way, you need a tool that can go beyond basic engine ecu scanning to see whats happening on other systems.
     
    Makuono likes this.
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