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Discussion Starter #1
Good morning everyone,

Well Im back in a Maserati drivers seat :). A 2004 Spyder

Sadly, she has the listed DTC codes, will not shift passed 2nd gear, and no speedometer.

Just to share in case anyone encounters this issue, it is the abs module. Like many parts on our cars, we share several parts with more average vehicles. In this example our ABS unit being a Bosch 5.7 used in several audi, vw cars, and some Bentley. Anyhow, I switched it out with a module from an a8 and sent it to the dealer to have it flashed.

Dealer cant communicate with the module at all. Says he feels there is a short somewhere. I tested for power and before i shipped it off and he says that he did to so now they feel it is an issue on the CAN bus. He asked Maserati for wiring diagrams on Wednesday and we haven't heard anything back.


I have seen several request for full wiring diagrams for the 4200 but I have not found a completed set. I do already have the workshop manuals located here:

Anybody have anything better or have a final answer on, as crazy as this sounds, if they exist?

oh, and any chance there is Maserati tech on here that can tell me the ABS coding for my model? I cant communicate with the maserati but i could throw it in my jag or audi to code it.

Thanks in advanced!
 
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Ok, you are kinda all over the place here..Yes, you need the ABS module for the speedo and the gearbox to work correctly... The CAN bus can be checked by going to pins 6 and 14 on your OBD2 connector..It should read 60 ohms...basic shit here...Sounds like your dealer couldn't fix a toy wagon....Just because a vehicle uses a 5.7 Bosch ABS module doesn't mean you can just swap them from make to make or code/configure them....All these manufactures have different protocols(languages) they use and you can't even communicate with the unit...What is ABS coding? My best advice is check the CAN bus and look for a good used unit on EBAY...The rebuilders can't always fix them when they don't communicate.....Jason
 

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Welcome back and good luck on the 2004 spyder... Really too bad you're having problems out of the gate but as Jason mentioned, you can't just swap the parts from other cars even if they appear to be the same. The tech should be able to read codes and do trouble shooting on the transmission issues. Can bus tech is likely needed as well and the pins are OBDII standard so a shop should know this. In any case, if they can't seem to figure it out, try another shop. Good luck hope it comes out well for you

Best Regards,
 

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I suspect it is just a bad wheel speed sensor, they are integral with the wheel bearings. the communication issue seems to be just the tech not having proper equipment. most scanners will not communicate. And yes, the ABS unit has to be from a Cambiocorsa spyder, nothing else will work, coupe will work but will have wrong calibration.
 
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The dealer can't communicate with the module because there is a Audi module in a Maserati.. You can't flash, reprogram, or configure anything in this case....Jason
 

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I can offer this. I was working on an older VW Passat and could not clear the abs module fault.
internet search led me to a small shop that repairs them. Send them yours and the repair it. So no problem with cross switching.
Somewhere north of 100 bucks got it fixed. Plus shipping.
The problem is you could never find it searching under Maserati. Look under VW. Then call them and show them the model number on your unit. They will say yes or no.
if you can’t find them PM me and I will dig it up.
The fix, apparently is just resoldering a connection that fails.
 

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Discussion Starter #7
Ok, you are kinda all over the place here..Yes, you need the ABS module for the speedo and the gearbox to work correctly... The CAN bus can be checked by going to pins 6 and 14 on your OBD2 connector..It should read 60 ohms...basic shit here...Sounds like your dealer couldn't fix a toy wagon....Just because a vehicle uses a 5.7 Bosch ABS module doesn't mean you can just swap them from make to make or code/configure them....All these manufactures have different protocols(languages) they use and you can't even communicate with the unit...What is ABS coding? My best advice is check the CAN bus and look for a good used unit on EBAY...The rebuilders can't always fix them when they don't communicate.....Jason
I just brought car home. Dealer couldn't figure it out. Wtf!?

I ordered a abs pump from an 05 QP. Still no communication.

Now that I have the car home. I checked my OBD connector and there certainly seems to be an issue on the canbus.

I have an Open connection when testing for resistance across 6 & 14. Also, I am showing roughly 10v of voltage on pin 14 with key off. 0v on pin 6 with key off.

About 5v on pin 14 with key on and ground with fluctuations to about 2.5v on pin 6 with key on.

Not sure exactly how I'd like to approach this. I'm not sure of all nodes on can bus but I know ecu, tcu, and abs for sure.

I am thinking I may want to start by testing resistance between the nodes and see how that returns. I certainly feel as if there is an open wire or short but I'm not sure how 10v is on the can bus.

Could one of the terminating resistors (120ohms) be bad. If so, where are those located? In all my years, I've never had to replace one.

ABS Coding is the configuration of the Bosch abs module to configure it to the correct manufacturer, engine size, etc. I've done it on AUDI products using VCDS but I do not know the manufacturer prefix for Maserati which is why I sent it to the dealer. He told me another manufacturer abs pump could be recoded to work in the Maserati as long as it was the Bosch 5.7 module. I'm not sure if he was incorrect or not considering my entire canBus appears to be down.

Thanks
 

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Discussion Starter #10
You need a wiring diaphragm before you go any farther...Jason
Is your CAN bus connector for the SD unit connected? It's under the dash.

View attachment 129773

Thank you I will check that connection.

I would LOVE a set of FULL diagrams. Anyone have them??

Mine are very limited but seem to be the best that is available on the net.
WorkShopManual pg671 for diagrams

Ok so I just did a little bit of further investigation and here is what I have.

There is 10-11v showing at the OBD connector pin14 with key off.

This voltage does not show at the CAN lines at the TCU or ABS Module.
Also the resistance at the ABS and TCU read correctly at 60ohm or 120 with ABS disconnected.

(In case anyone cared to know our Terminal resister is in the Bosch 5.7 Module. I assume the other is in the ECU but I will confirm and report back)

I pulled fuses until I was able to make find source of the voltage and it is coming from Fuse F23 in the Dashboard Branching ECU in the passenger footwell.

It says this fuse is responsible for "ECU for CAN line interface, OBD, Maserati CODE system, multi-function display"

Would that be P/N 196622??
THIS???

Has it failed? Anyone know how to test it?
I guess that would make sense.
 

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ABS units are coded to the specific car, even if the units themselves look identical, they will not communicate. each time you turn the ignition on, the ABS unit performs a handshake with other modules such as engine ECU and confirms that it is indeed installed in the right car. if this operation is not successful, it will not communicate and go into fault mode. you MUST get the right part # ABS unit and use an maserati/ferrari SD2 scanner to have it initialized, including calibration of the steering position sensor. unfortunately, there are absolutely no shortcuts to this process. no substitutions, no alternatives. ABS units can not be reprogrammed. The only trick or shortcut available would be using a different scanner instead of SD2, but that is a long long shot. some high end expensive scanners may communicate, but would require hours and hours of trial and error, with a very slim chance of success. if you want to spare yourself the frustration, give up the hope of finding a way around it, get the exact replacement ABS and have someone with SD2 initialize it for you.
 

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The CAN bus is a two wire serial bus so a wiring diagram will show you nothing. It's what the ABS unit says vehicle speed is that the ECU reads, or not in this case. It's like looking at your Internet cable and trying to guess what signal is being transmitted between two computers.
 
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You need a wiring diagram so you can see how the network is arranged and then possibly start by pulling nodes of the network...You can have a module that knocks the thing out...These cars don't have much of a network so you can pull each module offline( unplug) and see if you can communicate withe the ABS...A module can work just fine and still knock out the network...After that then start checking the continuity of the wires between the modules..I'm not sure why you are measuring voltages at the OBD2 connector..? You do have a Maserati ABS module in the car correct? I'm also assuming that someone checked for proper power and ground at the ABS module along the way? Jason
 

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Discussion Starter #14
You need a wiring diagram so you can see how the network is arranged and then possibly start by pulling nodes of the network...You can have a module that knocks the thing out...These cars don't have much of a network so you can pull each module offline( unplug) and see if you can communicate withe the ABS...A module can work just fine and still knock out the network...After that then start checking the continuity of the wires between the modules..I'm not sure why you are measuring voltages at the OBD2 connector..? You do have a Maserati ABS module in the car correct? I'm also assuming that someone checked for proper power and ground at the ABS module along the way? Jason
Yes. If I had a diagram of the canbus that would go a long way.

I do have a known working Maserati ABS Module in the vehicle.

I checked the resistance and voltage at the OBD connector 6&14. Expecting 60ohms and about 2.5v when normal.

I am showing OPEN across 6&14 or higher resistance than my meter can read. Also showing 10v on the Can L with key off and around 5v with it on.


When I pull F23 fuse the key off voltage goes away which is leading me to believe the defective device is the can bridge.

Anyone know any more about this device? Or the circuit attached to fuse F23?


ABS Coding is the programming of the Bosch ABS module to be compatible with whatever vehicle it is being installed into. I did not know the soft coding information for Maserati which is why i sent it to the dealer for repair when i thought the abs module had failed. I was told by the tech that he could re-code my audi/vw/etc module to the vehicle.....clearly he didnt

ExampleOf_ABS_Coding


Does anyone have a canBus diagram?
 
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http://www.maseratitechinfo.com......They have the diagrams, but you need to pay a subscription fee...

Like I mentioned before...You can't take Audi/VW modules and put them on a Maserati...They don't use the same protocol and speak a different language..You would bolt it up and then get a communication failure warning.. If that was the case you could just take VW software and work on a Maserati...Clearly the tech. doesn't know what he is talking about.....Jason
 

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I have downloaded the 3200 GT manuals and in many ways the 3200 is similar to the 4200 (except for the engine and transmission). There is a diagram for the CAN bus there. You should be able to find the 3200 GT manuals on the Internet.
 

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Discussion Starter #17
I have downloaded the 3200 GT manuals and in many ways the 3200 is similar to the 4200 (except for the engine and transmission). There is a diagram for the CAN bus there. You should be able to find the 3200 GT manuals on the Internet.
Thank you! I'm searching for them now.

I do feel I have found at least part of the issue and that is the CAN Bridge I mentioned above.

Just from what I have discovered with my handy dandy meter so far I can tell a few things about the CAN bus layout and my issue.

1. The OBD Connector passes thru the CAN Bridge to gain access to the CAN network.
(I was wondering why the wires for pin 6/14 were not the same white/green as the rest of the network.
2. There is continuity between pin 6/14 at the OBD connector and the pins coming in at the CAN Bridge.
3.The CAN bus lines leaving the CAN Bridge read ~57ohms.(normal)
!!(PROBLEM)!!
4. I am showing ~6kOhms of resistance when i plug up the CANBridge and I read the resistance between CAN L and the incoming pin from the OBD adapter. No resistance on CAN H back to adapter.

I am thinking CAN Bridge has an issue for certain. Showing resistance and leaking voltage onto CAN L. Any thoughts?

I was going to attempt to jumper the pins on the plug at the C/B to see if I can then scan the network successfully.

If you know where I can find those 3200 diagrams I would greatly appreciate it. Thanks!
 

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http://www.maseratitechinfo.com......They have the diagrams, but you need to pay a subscription fee...

Like I mentioned before...You can't take Audi/VW modules and put them on a Maserati...They don't use the same protocol and speak a different language..You would bolt it up and then get a communication failure warning.. If that was the case you could just take VW software and work on a Maserati...Clearly the tech. doesn't know what he is talking about.....Jason
Jason. He now has an '05 QP abs pump/module in there. Probably not compatible or plug and play. Correct?

According to what muratokcu said it wont work.
 
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I'm not real sure as this not how would do it...You maybe able to communicate with it because of the same protocol, but it still won't work or function correcly.. I would use the same part # to avoid hassles as mentioned above...I have an older 2005 QP in the shop now...I'll use M138 software and see if I can talk to it in the morning, but that still really doesn't mean much..Use the correct parts is my answer.....I find the entire thread puzzling honestly...There are the incorrect parts fitted to the car and then the OP ask a question and then gives an answer about something different in the reply.. It is entertaining ...It is still broken so whatever...Jason
 

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Nomorejags...If your convinced its a can bus issue why dont you put the original correct abs module back in and start over. Seems like your going in circles with an after market scanner and different modules and no way to know what does or doesn't work and why.

After market scan tools have very spotty results on Maseratis. Might communicate with some models and years but not others, or some modules but not others.
 
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