NO SPEEDO, NO ASR LIGHT ON & NO TRIP INFO (2002 Coupe CambioCorsa)

I require help diagnosing a problem I have with my 4200,

1). The Speedometer/Odometer doesn't work - the dash itself has been tested and works (all dials/lights are functional) no movement what so ever when driving.
2). The (No ASR) light is on, so traction control is off permanent - I believe this is because it needs to know the vehicles speed to operate.
3). There is no Trip data available on the Infotainement system apart from Travel Time. (No MPG, Range, Aveage Speed Etc.

Would be great if I could resolve this before the the winter starts.

Kind Regards,

Kyle (2002 Coupe CambioCorsa)

Hi Kyle, lovely looking car in the best colour, but I'm biased.
Your best move is to take it to a Maserati specialist, an independent will be best value, who has the proper diagnostic tools.
Error codes will show them where to hunt down the cause/s.
Your photo looks like the UK, so let the guys know where you are and there will be lots of suggestions of who is recommended.
I had an irritating random interior fan glitch that after replacing lots of bits turned out to be a loose connection, so I know how frustrating some issues can be.
All the best.

Kyle, has the speedo ever worked?

C

BL330 said:

Hi Kyle, lovely looking car in the best colour, but I'm biased.
Your best move is to take it to a Maserati specialist, an independent will be best value, who has the proper diagnostic tools.
Error codes will show them where to hunt don the cause/s.
Your photo looks like the UK, so let the guys know where you are and there will be lots of suggestions of who is recommended.
I had an irritating random interior fan glitch that after replacing lots of bits turned out to be a loose connection, so I know how frustrating some issues can be.
All the best.

Click to expand...

That interior fan connector is becoming a bit of a known issue

C

On the 3200 there is some very funky fuse wiring and fuse 16 is well know for blowing causing a block of instruments to fail, including the indicators. there is a wiring issue around fuse 16 where several system run from more than one fuse (yes the fuses appear to be in parrallel). I would check fuses and relays as these are often a cause of problems. the other alternative would be road speed sensor? This is mounted to the gearbox i think. This should however show up as an ECU error, so if you have no error codes that is odd. 4200 is not my area really just throwing out some thoughts as the 4200 and 3200 do share some common DNA

Have a look at the Bridge Can unit, sounds like one of the multiplugs has worked itself loose. All the dash electronics are run through it.

Hello, thank you for your replies - I've had the speedo unit out and tested - this all works as does the bridge can (I replaced this also), the No ASR light is on permantley so I'm guessing this may have something to do with it not getting any speed info, I plugged a obdii diagnostic tool in and when I drove it came up with the speed so the ECU is getting a speed signal, I don't have ABS light on so could it be one of the wheel speed sensors gone? Or maybe a connection between the wheel speed sensor and the infotainment system/speedo. I know there's lots of different sensors on the 4200 that control the traction and suspension

You checked the fuse for the ABS/ASR controller and ABS relays?

I had my Car hooked up to a SD2 system,
Errors:

ABS/ASR 5.3 BOSCH

ASR not switched off but driver
ASR passive control
ABS passive control
BLS off
SPEED 2.75 Km/h

Points to note;
only my No ASR Light is ON
My ABS light is OFF
My Speedo/Odometer does NOT work

Kind Regards,

Kyle

I would venture a guess that your abs ecu is dead.
Try taking the car to a stretch of empty Road, speed to 30 or 40 then slam the brakes hard.

If the abs is working you will feel it kick in, if not the car will simply lock up the wheels.

Do the test with caution as you could lose control if the car if going too fast

The SD2/3 normally gives an ECU no response if it is dead. I reckon it's a wheel sensor.

Wheel sensor should trigger a specific wheel fault and light up the abs light.

This abs might have failed in a different way that they usually fail.

Also, there is a speed reading but I suppose the test was done with the vehicle stationary.
If that was the case it's most likely the ecu

jluis said:

I would venture a guess that your abs ecu is dead.
Try taking the car to a stretch of empty Road, speed to 30 or 40 then slam the brakes hard.

If the abs is working you will feel it kick in, if not the car will simply lock up the wheels.

Do the test with caution as you could lose control if the car if going too fast

Click to expand...

Or - point gun at foot, pull trigger, if hole appears - gun was loaded.

What did the person with the SD2 reckon was wrong? People guessing over the internet are no substitute for a tech with the car in front of them.

Have you checked that the speed sensor at the box is working? Are you getting correct vehicle speed readings at the ECU, TCU and/or ABS ECU?

Where are you located?

The Engine ECU reads vehicle speed perfectly !!
If no ABS faults and the Engine ECU has vehicle speed can we rule out all speed sensors and the ABS ECU ?

Could no speedo , no trip and no ASR be due to the transmission speed sensor mounted on the 4200 F1 box ?

The Specialist said it could be a wheel sensor gone but the funny thing is only the ASR light is on and not the ABS, the same module runs both so I would assume if it was a speed sensor a fault would come up and the ABS light would be on, speed is coming from the ECU just fine, maybe a connection from the module itself back to the speedo/infotainment system.

It seems the ABS sensors are fine, no error messages using the SD2, only a engine maintenance message so I'm guessing the module isn't communicating or it's fried, there's no ABS light on only the ASR as soon as the ignition is switched on, I will have to look at the wires and check continuity, if it's not that then maybe a new Bosch module.

**solved** no speedo, no asr light on , no trip info

Issue **SOLVED** in order of events :-

1. NO SPEEDO , ASR DISABLED LIGHT ON , NO TRIP DATA ON NIT , SUSPENSION FAULT LIGHT ON WHEN MOVING.

2. SD2/3 FOUND NOTHING TO PIN POINT , ONLY SHOWED "ENGINE MAINTENANCE MESSAGE" FOR THE ABS/ASR ECU

3. NOTHING TO DO WITH WHEEL SPEED SENSORS AS ABS WARNING LIGHT WAS OFF , IF ANY SENSOR FAULT THEN ABS LIGHT WOULD BE ON.
VEHICLE SPEED DATA IS FROM ABS/ASR ECU ONLY NEEDING ONLY 1 SENSOR FOR SPEEDO TO WORK , NORMALLY AVERAGING THE FOUR.

4. NOTHING TO DO WITH BRIDGE-CAN AS ALL OTHER FUNCTIONS WERE WORKING.

5. NOTHING TO DO WITH DIODES IN WIRING LOOM AS THAT WOULD AFFECT OTHER SYSTEMS.

6. THE ENGINE ECU DID SHOW VEHICLE SPEED WHICH WAS ODD , BUT NO FAULT ON ABS SO STILL POSSIBLE.

7. THE SYSTEM WORKS BY THE VEHICLE SPEED DATA AND ASR ON/OFF COMMUNICATION OVER C-CANBUS BETWEEN THE BRIDGE-CAN , ABS/ASR ECU AND THE ENGINE ECU.
THE BRIDGE-CAN RESENDS THE SPEED DATA TO THE NIT VIA THE B-CANBUS FOR THE TRIP COMPUTER DATA. THE BRIDGE-CAN ALSO CONVERTS THE SPEED DATA TO ANALOG FOR THE SPEEDO , THE SUSPENSION ECU , THE WINDOW ECU AND CLIMATE CONTROL.
THE BRIDGE-CAN IS PROGRAMMED WITH THE STOCK WHEEL DIAMETERS AND TRANSFERS THIS INFORMATION TO THE ABS/ASR ECU AT IGNITION ON.

8. AT THIS POINT IT LOOKED LIKE SOME VECHICLE SPEED DATA ISSUE BETWEEN THE ABS/ASR ECU AND THE BRIDGE-CAN , BUT WHY AS NO SYSTEM SHOWING ANY FAULT - ONLY THE RED ASR OFF LIGHT ON.

9. DECIDED TO LOOK AT THE ABS/ASR MODULE PART NUMBER 184827 , THE ABS/ASR VALVE BODY SHOULD BE BOSCH 0265 220 623 AND ABS/ASR ECU SHOULD BE BOSCH 0273 004 577.

10. WOULD YOU BELIEVE IT I FOUND A FERRARI 360 ABS/ASR ECU BOSCH 0273 004 202 FITTED INSTEAD !!

11. FITTED THE CORRECT ABS/ASR ECU AND ALL SORTED.

12. SO THE INCORRECT ABS/ASR ECU WAS OKAY FOR STANDARD ABS FUNCTION AND SENDING SPEED DATA TO THE ENGINE ECU. BUT ITS INTERNAL SOFTWARE WAS NOT DESIGNED TO SEND/RECEIVE DATA TO/FROM THE BRIDGE-CAN HENCE THE MISSING SPEED INFO.

Regards
Kyle

Result

That would mean that you either bought the car with the fault, or that ECU worked well for some time.
Was your car faulty when you bought it?