Hi all, I have just bought a 2000 Punto Sporting 1.2 16v with ABS and it turns out it has had the 1.4 16v engine fitted from a Stilo at a guess and also started life as a speedgear!.
The car starts and drives fine but has no speedo working and is showing P0500 VSS sensor/circuit.
I have already tried a known good VSS sensor in the gearbox.
The engine loom fitted has a datecode for 2003 so I know its not original.
I have traced the vss wiring back to the multi pin connector by the side of the fusebox and found that the vss pins on the engine loom connector dont continue any further on the body loom connector.
If anyone can shed any light on the pins I need to switch to feed the VSS signal to the BCM I would really appreciate it.
Thanks in advance
Lee

your speedo should work from the abs so it would appear you have deeper problems?

Thanks for the reply,I thought the same at first but I have since been reliably informed that earlier mk2s still use the VSS on the gearbox and only later models use the ABS for the road speed signal for the speedo.
The problem lies in the fact that the VSS signal wires dont continue any further on from the body loom side of the multiplug next to the underbonnet fusebox.
The vss pins in the multiplug need to be switched into what are currently blanks to feed the VSS pulse on to the BCM (behind cabin fuseboard)
I am hoping that someone has encountered this pinout problem before when doing a conversion.
I have checked all sytems with autocom and the only fault showing is p0500 Vehicle speed sensor circuit which makes sense.

if car has original body computer?
abs system working?
and wrong underbonnet loom?
why not put a 2000 sporting underbonnet loom on then?
seems easiest solution

are you now running a manual gearbox but still using the speedgear body computer?

Thats an option I am considering, I just dont want to end up with another incorrect loom.
I am going to trace the Green and Grey signal wire from the body loom side of the multiplug back the BCM before I make any pin switches.
I cant see why there will be any problem switching the pins over to match up at the multiplug as everything else on the current engine loom is working perfectly.

I didnt do the conversion but the BCM and underbonnet fusebox have been changed along with manual dash clocks.
I assume the previous owner did the switch over and then couldnt find the speedo problem?

No idea.

If you get nowhere, a GPS speedo?

if the loom is off a speedgear then it should be ok when that's changed, speedsensor on a speedgear box is different connects to the gearbox loom that then connects to engine loom with a bit square connector.

Thankyou, that makes perfect sense and explains why I cant find any vss related wiring in either of the two connectors by the fusebox on the body loom side.
It sounds like I could possibly pick up the vss wires in the square connector make a small piece of loom up to do the job.
After disturbing the engine loom today I now also have a code that won't clear for throttle position sensor circuit b...
Back on it tomorrow if I get chance.
I will post my findings for anyone interested.

Problem solved, picked up the VSS signal line at pin 17 of connector C on the BCM.
The VSS now gets its 12v line from its original connection the fusebox (blue vss wire), the violet/black VSS wire is a ground and I have fed the green/grey vss signal on an extra wire direct to pin 17 of BCM connector.
Problems resolved speedo working perfectly, thanks to all for your input.
:beer:

well done but photos always speak a thousand words

Body Computer connector A

1 Left hand door open switch
2 Left side indicator repeater lamp
3 Right rear indicator lamp
4 Fuel level sensor (+)
5 Left tail lamp
6 Right tail lamp
7 Alarm sensor serial line
8 Left front door lock - open signal
9 Not connected
10 Autoclose serial line (may be for electric windows)
11 Right hand door open switch
12 Left rear indicator lamp
13 Right side indicator repeater lamp
14 Handbrake "on" switch
15 Fuel level sensor (-)
16 Left rear door lock - open signal
17 Right front door lock - release signal
18 K-line aggregate 3
19 Not connected
20 Not connected
21 Courtesy lamp timer control
22 Right hand brake lamp
23 Courtesy lamp supply
24 Left front door lock - release signal
25 Right front door lock - open signal
26 Left rear door lock - open signal
27 Alarm sensor supply
28 Not connected
29 Not connected
30 Not connected
31 Left rear fog lamp
32 Left hand brake lamp
33 Boot lamp supply
34 Left front door lock - locking signal
35 Right front door lock - locking signal
36 Boot open switch
37 Not connected
38 Not connected
39 Not connected
40 Not connected


Body Computer connector B (EOBD socket)

1 K-line ABS control unit
2 Not connected (standardUS)
3 K-line Air bag control unit
4 Power earth
5 Signal earth
6 CAN-bus B
7 K-line engine ECU, auto-transmission
8 K-line immobilizer
9 Preparation for aggregates 1 (dashboard)
10 Not connected (standardUS)
11 Anti-theft device (alarm)
12 Preparation for aggregates 2 (front)
13 Preparation for aggregates 3 (rear)
14 CAN-bus A
15 Not connected (L-line)
16 Supply


Body Computer connector C

1 Reversing signal for steering column switch
2 Not connected
3 Screen
4 Immobiliser CODE aerial
5 Immobiliser CODE aerial
6 ABS serial line
7 Speedometer signal from ABS
8 Front fog lamps relay R14
9 Main beam relay R2
10 INT supply for speedometer generator
11 Not connected
12 Not connected
13 Headlamp washer switch on column
14 Headlamp washer relay R17
15 Earth for speedometer generator
16 K-line for ABS
17 Speedometer signal from pulse generator
18 Brake fluid level sensor
19 Alternator +D signal
20 K-line for ECU diagnostics
21 RF aerial earth (another source states pin C3)
22 Not connected
23 Not connected
24 Bonnet open switch
25 Alarm siren serial line
26 CAN-bus A for electric steering
27 CAN-bus B for electric steering
28 Repeater for speedometer signal
29 ISO5 interface - immobiliser and ECU
30 Right front sidelight
31 RF aerial (another source states pin C1)
32 Not connected
33 Not connected
34 Alarm supply (alarm siren)
35 Preparation for aggregates 2 (K-line for diagnosis)
36 CAN-bus A from ECU
37 CAN-bus B from ECU
38 Left front indicator
39 Right front indicator
40 Left front sidelight


Body Computer connector D

3 Instrument supply (+30)
4 Dipped beam switch on column
5 CAN-bus A to instrument panel
6 CAN-bus B to instrument panel
7 Indicator switch on column (left or right?)
8 Earth, passenger dashboard
9 Earth, passenger dashboard


Body Computer connector E

12 K-line for air bag control unit
20 Front fog lamps switch
22 Radio

Body Computer connector F

29 Hazard switch lamp
30 Indicator switch on column (left or right?)
31 Instrument supply (+15)
32 Heated rear window switch
33 Main beam switch on column
34 Hazard lamps switch
35 Rear fog lamp switch
36 Instrument supply (-)

NOTE: Pin numbering suggests D, E and F share a 36 way plug/socket


Body Computer connector Y (connects directly pin for pin to plug X on passenger fusebox)

1 Central locking supply
2 Top brake lamp signal (ponit between switch and lamp)
3 Reversing signal (point between switch and lamp)
4 Not connected
5 CAN-bus B to fusebox connectors E5 (radio) and D28
6 Heated rear window relay R11
7 CAN-bus A to fusebox connectors E17 (radio) and D10
8 Dipped headlamp relay R1
9 INT supply for body computer (ignition on, before F37)
10 Door locking motors
11 Door unlocking motors
12 Light system supply from ignition switch
13 INT supply for Instrument panel connector (ignition on after F37)
14 Sunroof, electric windows relay R13
15 Heater controls and cigar lighter illumination and number plate lamps
16 Not connected
17 Services / SMBT services supply
18 Body computer supply (immob., CAN-bus, sidelight, rear fog lamp)
19 Supply for indicators, hazards, instrument panel connector (via F53)
20 Central locking earth