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Hill Holder function not working

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chrisbinsb

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Discussion starter · #1 ·
Just brought home a new to me '05 Gransport and I'm thrilled. I did find that the hill holding feature does not appear to be working. I understand that earlier cars didn't have this feature but my friends '05 does so I assume this car should as well.

Any ideas where to look first for possible fixes? I talked with the previous owner - he loves in a pretty flat are and never realized it was supposed to do that so no way to know how long it's been out.

Thanks!!
 
#2 ·
My car is supposed to have it too, 04 CC. And it never worked, I just keep my left foot on the brake.
 
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#5 ·
The hill holder uses the brake system to hold the car for a very short time when the brake pedal is released to give time to move to the throttle. The clutch action is the same whether it works or not. If the car rolls backward because the hill holder doesn't work or you don't use the brake, then that would be harder on the clutch.
 
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Discussion starter · #7 ·
Anybody know how the system works exactly? I tried to find workshop manuals, but the links in an older thread to download them aren't active anymore. If I know how the system works, what relays, fuses, controllers, cables, etc are involved then maybe I can find the weak link.
 
#8 ·
I heard of people who had older models with the hill holder function who end up losing it after getting their CC software updated. God knows what happens in that electronic brain with the updates. Mine positively does not work so I just use my left foot on the brake to keep the clutch from frying. My friend has a 06 MCV and his hillholder function works fine.
 
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#9 ·
lcdave said:
The hill holder uses the brake system to hold the car for a very short time when the brake pedal is released to give time to move to the throttle. The clutch action is the same whether it works or not. If the car rolls backward because the hill holder doesn't work or you don't use the brake, then that would be harder on the clutch.
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Can you point us to a resource that confirms this is how the system works? I do not believe there is any active brake control in this car.
 
#10 ·
FlyinBrian said:
Can you point us to a resource that confirms this is how the system works? I do not believe there is any active brake control in this car.
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I'll find it when I get home. It's part of the EBD system. I'm not sure about the older cars but the newer ones have it. It's what also gives max braking for emergency braking. Also tied into the MSP for yaw control.
 
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Discussion starter · #11 ·
pigfragger said:
I heard of people who had older models with the hill holder function who end up losing it after getting their CC software updated. God knows what happens in that electronic brain with the updates. Mine positively does not work so I just use my left foot on the brake to keep the clutch from frying. My friend has a 06 MCV and his hillholder function works fine.
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I just stumbled on that issue via google and another maserati forum - like you say apparently some cars lose the feature after an update. Strange though, you would think that this could be reversed with another software update to fix it again.
 
#13 ·
chrisbinsb said:
Any luck finding info on this? Thanks!
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I took a quick look through the prints I have readily available but couldn't find what I wanted. If you look in the description of the system in the owner's manual and the yaw sensor description in the workshop manual, you will see what I'm talking about. The EBD system is what provides stability control instead of simple wheel spin reduction as was in the early models. The active braking (Enhanced Brake Distribution) is what will attempt to straighten the car in ICE mode when you try to get sideways. When the hill holder is working properly, you can come to a stop, release the brake, and without applying throttle, feel the brakes release after a few seconds. It determines the time based on the accelerometer in the yaw sensor. It does require some speed to activate. 5mph IIRC. If you take a look at the brake system under the hood, it's fairly obvious that it isn't just ABS. As to how to find why it isn't working, I don't know of an easy way. The SD3 should tell you what's wrong. Short of that, I would test the yaw sensor longitudinal accelerometer.
 
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chrisbinsb
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