I hope someone might be able to shed some light on this and where I should go next. I have an issue with the OBD2 port on my 1997 F355. Also my car is a Canadian Model if that makes a difference with a near complete engine rebuild. I have the new Foxwell NT530 scanner that works great on my BMW and Lexus, but it will not read the Ferrari. The local shops seem to be able to read the codes but I suspect they are not using the DLC, but a 3 pin connector. The DLC appears to have the recall service bulletin done to it. (Figs C and D) I did find a bent pin in the 9 Pin connector but it was not the blue wire which goes to the DLC. (Fig A) In a former post I was reading that there should only be 4 wires as follows: Pin 4 - ground - black Pin 5 - ground - black Pin 16 - +12V 2 data pins not specified as to which pins or colors and where they are to be in the My connector is wired as follows: Pin 4 - black - ground Pin 5 - black - ground Pin 7 - gray - traced to a 3 pin connector near the Motronic ECU and color changes to gray/blue (Fig B and C) Pin 13 - blue - traced to the 9 pin connector near the Motronic ECU (Fig A) Pin 15 - gray/red - traced to a three pin connector near the Motronic ECU and color is gray/red Pin 16 - +12V - orange Which colors are the data lines? I have checked continuity all the way though the scanner cable to the 9 pin and other three pin connector respectfully. I assume the grounds are working because the scanner is getting power. I suspect the wires are not at the correct pin locations. Help anyone, i want to stop always taking this vehicle somewhere to get the codes identified or cleared. BTW I am not a sparky. Fig A Fig B Fig C Fig D
Missing Figures from Original post. Fig A Image Unavailable, Please Login Fig B Image Unavailable, Please Login Fig C Image Unavailable, Please Login Fig D Image Unavailable, Please Login
Here it is The pins below are the 88 connector pin at the ECU. Row 3 80 Brown Black Diagnostic Port Input (OBD2?) from port to ECU Row 3 87 Red Grey Diagnostic Port Output (OBD2?) from ECU to port You also need to disable the Immobilizer before the OBD2 port is active.
+1 A common mistake. Unfortunately, I don't have a diagram which includes the USA/Canada OBD2 port, but we may be able to piece together something. Do you have an F1 car or gated manual? Here's the gated car diagram based on a number of different diagrams (which doesn't include the USA/Canada 16 pin OBD2 port) Fig11a_1997_5.2_Injection_System_Ignitionv2 The only variation I've found is the wire colour on the ECU side of the 3 pin plug, but I assume it goes to the same pin. It's grey-black in my diagrams. Using this diagram, and your descriptions, I've created this diagram... F355(5.2) OBD2 Port Wiring (USA) Interestingly, I see some of the wiring goes to the Alarm Interface Unit. It's a mystery what's inside it. Can you confirm on your car that the wiring on the ECU side of the 9 and 3 pin plugs matches the last diagram? (Just the OBD2 port-relevant wiring)
Sorry, posted the wrong diagram (but it did include relevant parts of the circuit, including the Alarm Interface Unit). Here's the diagram I intended to post: Fig11_1998_F355_5.2_Engine_Control_System
I'm not sure what this wire is hooked up to. Does it need the ignition to be on for power to be present?
Qavion, I will try to look at this today. I have a gated manual. The +12V orange wire is always hot. The Key does not affect it. Regards
Thanks. Interesting. I wonder if it's powered by Fuse 29 (Roof lights, doorlocks & clock). They use orange wires.
Ian, Thanks for your schematics. They are easy to read compared to what I had. Where are they from? I have now traced or verified the following: OBD2 port Pin 16 has +12volts OBD2 port Pin 15 has continuity to Pin 87 of ECU connector 20030 OBD2 port Pin 13 has continuity to Pin 60 of ECU connector 20030 OBD2 port Pin 7 has continuity to Pin 9A of connector 41090 OBD2 port Pin 4 and 5 are at ground These have been verified through the Foxwell connectors and cable as well. So it appears that the scanner cable is OK. Pin 87 of ECU connector 20030 has continuity to Pin 8A of connector 41090 Would check Pin 8B and 9B to the ALARM INTERFACE UNIT if I new where that is? Still no scanner connection with disabling the immobilizer with the key fob. Is this OK? Could someone tell me where the ALARM INTERFACE UNIT is and is it fused? I am running out of options or the problem lies in the Motronic ECU (which I am skeptical about). Next thing is to complain to Foxwell perhaps the software on the scanner is corrupt for Ferrari. IDEAS?
I made them myself (blood, sweat, tears and dollars involved) Interesting. I thought 88 was supposed to be connected to pin 8A. I did have trouble with these particular wires when drawing the diagrams, as all the official Ferrar paper and electronic diagrams I have (except one) show 89 pins on the ECU which is clearly wrong. The first pin is marked as "1" and the last pin is marked as "88", but if you physically count the number of pins on the official Ferrari diagrams, there are 89 There is a numbering error between 1 and 10. I have corrected my diagrams, however and I and others have tested them in the field. When you did your wiring checks on pin 87, did you have the connector connected (or did you backprobe the pins/sockets)? I'm just wondering if pin 87 is hooked up to 8A by an alternate route, say, though the alarm interface unit and data plug. It's behind the left hand seat under a leather cover (and hopefully not a riveted metal cover under that). It's the smaller of the two boxes there. My tech said that sometimes you have to plug a Ferrari SD tool into the alarm unit data plug to reset it before you can talk to the ECU with a scanner. Hopefully this does not apply in your case. Here's a diagram for the alarm system, although there does seem to be variations between cars. 5.2_Alarm_System The interface unit only has black wires going to it, so it's quite difficult to figure out which wire is which. I don't know if the box is fused, but I've marked pin 7 in red, so you may find power on that pin (battery or otherwise). Some scanners won't work if you tell the scanner your car is a Ferrari. Sometimes it helps to say your car is an Audi or other European car. It will still give the right codes, but not necessarily the right interpretation for those codes. (EDIT: Sorry, I've messed up the formatting... ignore all the underscoring and blue lettering)
Ian when my car was converted to RHD when came to Australia the company that did the work installed an Australia style 16 OBDII plug and that was put under the dash. It only has the wires from the Ferrari OBDII (Fiat compatible 3 pin OBDII) plug connected to it. +12V, Earth & Diagnostic as per YelCab's previous comments. My car is 96. Key on and immobilized or it WILL NOT connect to scan tool.
Confusing... So far, we have 2 or more variations... Although I haven't got an OBD2 port on my 1998 car, I'm pretty sure my car's 3 pin plug is wired up as per the official Ferrari 1997 wiring diagrams (which are the same as my colour diagrams for the 5.2 car). If your car (Paul) and Mitchell's car has the 3 pin plug wired up directly to pins 87 and 88 via the 3 pin plug, then is this applicable to the earlier 5.2 cars only (96 and possibly early 97)? I don't have any engine diagrams for the '96 cars. Although I do have paper diagrams for 97 USA (5.2) cars, they don't show a 16 pin OBD2 port. Maybe Laserman could try interrogating the ECU via the 3 pin plug with a cheap Fiat 3-pin OBD2 adaptor? Paul, do you only have 3 wires on your 16 pin OBD2 port or do you have a power wire, too? My pin 1998 ECU pin 80 (brown-black wire) only goes to the tachometer. This is even shown in the original Bosch ECU diagrams (dated 1993!). Interestingly, the Ferrari 550 wiring diagrams show a brown-black wire going to OBD2 port from ECU pin 88 (via the "K" line on the 3 pin plug). I'm not sure what function pin 88 has on the 550, however. The 550 has one ECU for 6 cylinders, so the pin functions might be quite different.
Do you mean something like this Image Unavailable, Please Login Then do I plug this into the three pin connector near the Motronic ECU. And then use my scanner?
Correct. Note however that some folks on FChat bought one like that recently (also advertised as a Fiat 3-pin adaptor) and the pins on the plug were too big. I recall they either had to modify the pins or go to Fiat to get one. I can't find the message thread relating to this (which showed the faulty one). I also bought a cigarette lighter adaptor from a local electronics store to provide power to the Fiat adaptor.
Found the message thread.... Don't buy from these guys... https://www.ferrarichat.com/forum/posts/147176413/
I can't remember where I bought mine but I have had no issues with it. I can plug in at the 16 pin ODBII or the 3pin Fiat plug behind the seat.
So what is the difference in buying the Fiat plug or taking the pin 13 blue wire out of the the DLC plug? That seem to be the only change. Or am I missing something? Seems to me that that might actually be easier.
I think this was only suggested in case there was, perhaps, an internal problem with the OBD plug... or it was wired up incorrectly stopping the data flow. My blue wire is connected to ECU pin 60 and pin 6 of plug 41090, but it doesn't go anywhere else. It doesn't seem important to my car, but I don't know about yours (I have a USA ECU and wiring harness, but it may have a different part number to yours. Did you figure out where all the wires on the 3 pin plug went to (on the ECU side)? i.e. specifically, the gray-blue (OBD "L" line) and gray-red (OBD "K" line) wires. Mitchell says ECU pins 80 and 87. I'll redraw the wires on that diagram if you can tell where they go (and we can figure out what the differences are)
Got the scanner to work today. I let the scanner think it was a BMW. Then went back and did the standard OBD2 code scan. It came back with P0153 and P0133 both of which are for the Bank 2 and 1 O2 sensor slow response sensor location 1 (I assume these are the O2 sensors in front of the cats). This make some sense since I found a bend pin in connector 41090 and I think it was for O2 sensor heaters. Then it indicated it had found factory codes so Identified it as Ferrari and it spit out the following: P1451 - Secondary air pump relay control (short ground). P0159 - Same as the P0153 Bank 2 sensor 2 P0422 - Catalyst 2 efficiency below threshold Bank 1 1. damaged or leaking exhaust 2. Faulty Bank 1 Sensor 2 Oxygen Sensor 3. Faulty Bank 1 Sensor 1 Oxygen Sensor 4. Faulty Bank 1 Catalytic converter P0422 - Catalytic converter temperature out of range (that light did go on before but is now off). I have cleared the codes and will now see the next time I drive if they reappear. I deal with that when and if it reoccurs. As for: Did you figure out where all the wires on the 3 pin plug went to (on the ECU side)? i.e. specifically, the gray-blue (OBD "L" line) and gray-red (OBD "K" line) wires. Mitchell says ECU pins 80 and 87. I'll redraw the wires on that diagram if you can tell where they go (and we can figure out what the differences are) I found the following for this car. Connector 40210 Position L is color HR and connects to Connector 20030 Pin 87 Position G is color M and connects to ground Position K is color HR and connects to Connector 41910 Pin 9A No position 80 at all. Your existing drawing is OK except the wire colors have changed.
Excellent. Thanks. Didn't you say earlier that one wire changed to HL? So two wires the same colour? If L and K are the same colour, it sounds similar to the new harness I bought (which was different from the original harness. Anyway, it great news that you got the reader to work. Hope the codes stay away P.S. By the way, you're not the first FChatter to have problems with the pins on connector 41090
At the very beginning of the thread I wrote that pin 7 on the OBD2 plug starts out as GRAY (H) but by the time it get to connector 40210 it is GRAY/ BLUE (HL). Somewhere along the way the color changes (how Ferrari like is that). Exiting the connector 40210 toward ECU 20030 and 41090 line K and line L are both GRAY/RED (HR). Hope that clarified it for you
Yes, thank you. I'll try to add notes to my previous diagrams showing the colour options. If it's not too much to ask, if your car is still in pieces, it would be great if you could confirm that the 16 pin OBD2 connector power comes from fuse 29 (on the orange wire) Something like this: F355 (5.2) OBD2 Port Wiring 1997 Cheers
I will try but the car is still on the left right now with the wheels out for refurb. This make it difficult getting in an out. This might be a while until I get the wheels and tires in order.
