3200 Issues after a Lay-Up

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Duncanofengland

Junior Member
Messages
86
At the throttle body:

White 2.23 (not running), 2.04 (running)

Green 2.75 (not running), 2.50 (running)


Pressing the throttle fully makes no difference to these voltages.

Duncan
 
CatmanV2

CatmanV2

Member
Messages
48,734
Duncanofengland said:
2.34v
Click to expand...

Someone who knows will be along to correct me in a minute, but I think that's your problem. Voltages on the white and yellow need to be really close or the system decides there's a fault. From memory that's well outside the permitted tolerance

This is why Phil suggested splicing them together to see if that cleared it. Obviously if commoned, they will present identical voltages to the ECU. Not recommended long term, though

C
 
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Duncanofengland

Junior Member
Messages
86
I've just tried that, but there's no difference in the way that the engine is behaving. The fault occurs with the throttle at rest and the 'CHECK ENGINE' light, which is cleared once the ingnition 'on' self test sequence has run its course, comes on within about 0.5 seconds of the engine starting.

I have another question? Should the throttle flap open with the throttle pressed fully down and the engine not running?

Duncan
 
Oneball

Oneball

Member
Messages
11,107
I think your problem is the throttle body, either itself or the connection to it. This would explain your symptoms.

When you turn the ignition on it should do a self test of opening and closing. I’m not 100% but I think this happens irrespective of any pedal issues.

Vid link of my old one below.

oneball.smugmug.com

Maserati - oneball

This video hosted by SmugMug; your photos and videos look better here.
oneball.smugmug.com oneball.smugmug.com
 
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Duncanofengland

Junior Member
Messages
86
Oneball said:
I think your problem is the throttle body, either itself or the connection to it. This would explain your symptoms.

When you turn the ignition on it should do a self test of opening and closing. I’m not 100% but I think this happens irrespective of any pedal issues.

Vid link of my old one below.

oneball.smugmug.com

Maserati - oneball

This video hosted by SmugMug; your photos and videos look better here.
oneball.smugmug.com oneball.smugmug.com
Click to expand...
Thanks, mine doesn't do that. Perhaps it needs a tap with a hammer!
 
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Duncanofengland

Junior Member
Messages
86
Athough this a Magneti Marelli warranted part, with 'Warranty Void if Removed' security labels, it it a right hack inside.

The connectors to the ring motor all ALL dry-jointed and came apart with only gentle pressure. I guess that the damp over the lay-up has finally rendered these joints open circuit.

I'll have a go at re-soldering the joints, just to see if I can salvage it.

Duncan6802668027
 
davy83

davy83

Member
Messages
2,821
OK. The full throttle voltage is way too low. The minimum full throttle voltage is 2.9 volts. So while you can simple move the adjuster bolt I am wondering how it got like this? What voltage does the power wire read? It should be 5v DC and this should be the same on both. I am wondering if the power to the pedal sensor is running low for some reason? The idle votlages are jsut inside the spec but again are a little on the low side, so i am worried as to why your voltages are so low.
 
davy83

davy83

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2,821
ah well yes the TB should not fall apart like that either. And i am not suire but should it not be full of green potting compound? There are contactless rotary sensor kits for this TB available miight be worth doing while you have it in pieces anyway?
 
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Duncanofengland

Junior Member
Messages
86
Thanks for your advice.

I've re-soldered the joints and they are now good - but the engine is still behaving exactly the same. Is it possible that the engine ECU is preventing the throttle signal from reaching the throttle body - and if so, what could be causing that and how do I overcome that issue?
 
Contigo

Contigo

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davy83 said:
OK. The full throttle voltage is way too low. The minimum full throttle voltage is 2.9 volts. So while you can simple move the adjuster bolt I am wondering how it got like this? What voltage does the power wire read? It should be 5v DC and this should be the same on both. I am wondering if the power to the pedal sensor is running low for some reason? The idle votlages are jsut inside the spec but again are a little on the low side, so i am worried as to why your voltages are so low.
Click to expand...
Echo Echo Echo.... lol
 
Contigo

Contigo

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That TB is a right mess, it's been hacked with a homemade DIY contactless kit by the looks of things. Shockingly poor.
 
Contigo

Contigo

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Have you cleaned the pedal pot connector which clips onto the top of the pedal? And also cleaned the electrical connector in the engine bay which connects to the TB?
 
davy83

davy83

Member
Messages
2,821
On this one, be very clear the pedal sensor votlages are never fed directly to the Throttle body, there is a computer in between them and its down to Maserati engineers what the Throttle body is told to do, based on a number of inputs the pedal being one of them. so there is no direct relationship between the pedal sensor output and the throttle body demand. you need to get the Pedal sensor and TB working independently of each other and then let the ECU do its thing!!! This is not an electronic replacement for a throttle cable, it allows the ECU to do almost anything it wants with the actual throttle position, regardless of what the pedal is doing as is clearly demonstrated by limp home mode!! :)

Is it possible that the engine ECU is preventing the throttle signal from reaching the throttle body - and if so, what could be causing that and how do I overcome that issue?
allandwf said:
You clear any stored engine codes.
Click to expand...
 
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