![]() | Home > Technical (L322) > HDC Inactive and Air suspension inactive |
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Richcl Member Since: 23 Sep 2010 Location: Tewkesbury, Glos Posts: 1011 ![]() ![]() ![]() |
Usually after a few hours having been not started it's fine when I start car. Then it's either as soon as I move off, or a minute or so after driving off. Lights come on , and warnings on dash.
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Richcl Member Since: 23 Sep 2010 Location: Tewkesbury, Glos Posts: 1011 ![]() ![]() ![]() |
Sometimes as soon as I come off the brakes, when pulling away. Not the first use of brakes either, I did nearly 3 miles the other day without any lights/warnings... (I'd hope I used the brakes sometime during that journey! |
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SteveMFr Site Sponsor Member Since: 22 Nov 2009 Location: Strasbourg, France Posts: 1641 ![]() |
The correct answer is: D - all of the above. ![]() Low ambient temp: the viscosity of the oils increases, tolerances decrease - the motor becomes much harder to turn over. And diesels require longer cranking to attain adequate combustion temps. Low battery voltage: the battery stores and releases electrcity by way of a chemical reaction. Chemical reations are generally slowed at lower temps so the battery will not be putting out as much power on a winter cold start as in the summer. Obviously a new battery will be affected less than an older battery. The older the battery, the lower the voltage and the greater the voltage drop on starting. ABS ECU: the ABS, EAS, and HDC are all tied together through the DSC (got that?). If the voltage drops too far for too long, the ABS assumes that there is not enough power available to run the solenoids/ABS pump. The engineers obviously didn't take the real world into account during the software development and this problemwill have been rectified in a later sw version. ![]() RRC 2Dr, RRC 4Dr, P38, and 2 L322s (wife thinks I'm nuts - prob right, too) |
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Richcl Member Since: 23 Sep 2010 Location: Tewkesbury, Glos Posts: 1011 ![]() ![]() ![]() |
So.....Can I get software upgraded, or do I have to fit new ECU somewhere? |
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SteveMFr Site Sponsor Member Since: 22 Nov 2009 Location: Strasbourg, France Posts: 1641 ![]() |
double post |
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SteveMFr Site Sponsor Member Since: 22 Nov 2009 Location: Strasbourg, France Posts: 1641 ![]() |
quoting your post:
LR says fit a new ECU - that's how to upgrade the sw. ![]() There are savvy types, who remove the epropm from a new unit, read the sw, and flash it to a new eprom which is then installed into the old ECU. For the average guy, it's less expensive to get a new ecu, tho. ![]() ![]() RRC 2Dr, RRC 4Dr, P38, and 2 L322s (wife thinks I'm nuts - prob right, too) |
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Richcl Member Since: 23 Sep 2010 Location: Tewkesbury, Glos Posts: 1011 ![]() ![]() ![]() |
Thanks, Which ECU do I need to replace, ABS?
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SteveMFr Site Sponsor Member Since: 22 Nov 2009 Location: Strasbourg, France Posts: 1641 ![]() |
That's what it says in the TSB you posted. I would really triple check everything before doing this, tho. And if you have a dealer confirm the diagnosis and replace the ecu for you, you can at least fight for your money back if the problem is not cured. |
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