Well, this is strange. Photos of the ECU show different plugs to those shown in the wiring diagrams.. Image Unavailable, Please Login It seems that only the middle plug has 9 pins. I guess only 5 are used. Now I'm not sure of the pin numbering or even plug orientation.
My head is starting to hurt If the flap closed switch showed permanently closed (i.e. due to a failure) and you were trying to close the roof, I guess the pump wouldn't (need to) run. If the flap closed switch showed permanently closed and you were trying to open the roof, I guess that might stop the motor running (or does the pump motor logic rely on the flap open microswitch in this case?)
Ha that makes two of us! Firstly, I am very grateful for the effort you have put in so far with this debacle of mine! Secondly, I have no idea what the motor logic utilizes to run or not run. I'm not that smart on convertibles. And I have no idea which position the capote flap microswitch thinks its in. If we assumed the microswitches were all good (per my mech), where would that lead us next?
If no volts on relay pin 86 (with roof switch activated), then that would point in the direction of the ECU. I would still make sure, however, that all the fuse power is reaching the Roof ECU connectors. I've figured out the ECU pin numbering and plug orientation... The middle plug only fits half of the roof ECU plug. Image Unavailable, Please Login Image Unavailable, Please Login
There should be power on pin 25 of the top Roof ECU plug (key power) and pin 1 of the middle plug (live battery power)
I'll throw in my 2 cents, a failure point in the main harness is right near the drivers side secondary cylinder where the harness bends due to the top rasing and lowering..I would check there for any wire damage. Also,the only Scan Tool I have found that reads the Capote Top Live Data (the microswitch position) is the Foxwell NT520Pro with Ferrari Info. I have access to numerous other brand Scan Tools and for some reason the Foxwell is the only one that reads the Capote.
Thank you for that! I am open to whatever help or suggestions anyone has so I appreciate it and will check it out. I have a launch X431 but that's my only scan tool.
Ok, so I called Ricambi just to see what an ECU ran (I was hoping around $1,000).... yeah, its almost $3,900! Gulp. Any leads on other sources? With a new ECU for the top, is there any computer stuff that needs to happen or is it just a plug and play?
Options like eBay will run less than $1k. I would doubt it's the ECU. I've never heard of one going bad and I've been watching this forum for years. It's likely to be something else, something silly simple.
I hope so, but so far my mech and all these tests seem to be pointing to the ECU. I’m open to other suggestions though. Every wire or cable I can see seems to be connected and in good condition. No clue about the motor itself, but the lack of power getting to the motor when the switch is activated definitely steers us clear of the motor. I’ve heard that thing is an utter PITA to get access to if it is busted.
Note that I'm using wiring diagrams from the 360. Just in case the 430 pump relay is wired up slightly differently from the 360.... could you check that you have a ground/earth on pin 85 of the pump relay. i.e. do a resistance check to the chassis from pin 85. 360 diagram: Image Unavailable, Please Login I'd be interested to know what the resistance of the motor is. Maybe you could check pin 30 to ground.
Have all the earth connections been checked? An earth connection with a high resistance can test out with a meter to be fine but when a load is applied, the amps go to near zero. It can look like motor failure and all sorts of weird problems. Your top stopping mid-way the first time is that kind of thing, or it could signal a failure of a component, like the ECU. Since the rest of the capote tests out and the ECU is not known to fail, I would go for Occam's razor and look at all the grounding points. Disconnect, clean, apply dielectric grease, reconnect. Can't hurt and it could be the issue. A voltage reading only measures the voltage. It doesn't measure the load carrying ability of the circuit. My mother went to radio school in the Air Force during the Korean war. For some crazy reason, they put her in a technical field when she was unable to use a screwdriver without assistance. She's a smart woman but not mechanical in the slightest. After two times through the course, they finally gave up and sent her to the Pentagon. She learned two things from her time in radio school. 1. Check the power source. 2. Check the ground. That's it. Good stuff though. Usually fixes most things.
Heck I don't even know where all the grounding points are!! How on earth do you even begin that project?
Sounds good. 0.0 ohms is the earth, 0.5 ohms should be the resistance of the motor. F355 Roof ECUs have been known to fail (probably because they also power the seats). Maybe the 360s and F430s are getting older and these kinds of faults will appear. With no F430 spider diagrams, that's probably going to be difficult. However, you can check the main earth for the ECU by checking pin 3 on the middle plug. Image Unavailable, Please Login You've already checked the earth for the pump motor. There is also an earth on pin 4 (brown or black wire) on connector 1Q/31H which should be directly below the ECU. i.e. the bottom half of the plug should go to earth Image Unavailable, Please Login You should be able to determine pin numbers from wire colours and pin configuration. Image Unavailable, Please Login What is the resolution of your ohmmeter. Does it go to 1 milliohm (0.001 ohms) or 10 milliohms 0.01 or 0.1 ohms?
Pin 3 on the middle plug? i.e. on the wiring harness plug, not the ECU. "pin 3" may be a socket. ECUs usually have pins. Image Unavailable, Please Login (EDIT: Sorry, make sure the 14 pin plug "1Q/31H" under the ECU is connected.... assuming the F430 has this plug) If confirmed, the resistance is crazy high for an earth. Could be a wiring defect or faulty earth.
Yes it’s all connected. And yes I put the lead into the number 3 pin socket to test it. I’ll check it again in once the sun’s up, but I got around 30 ohms each time on the earth/ground.
Check the socket for signs of corrosion. As the earth wire goes to connector 1Q/31H then to an earth lug, perhaps you could check the resistance between pin (or socket) 4 on plug 31H and earth (chassis). Image Unavailable, Please Login Unfortunately, we are working with the assumption that the wiring from the ECU to the earth is the same as on the 360 (since we don't have 430 wiring diagrams). Perhaps you can see the colour of the wire on pin 4. Hopefully it is back (perhaps brown, further upstream, at the ECU connector). It would certainly be a great find if the earth was faulty (if we can find it).
Look for major earth studs behind the driver. There is one here, but I don't know if this is the one for the roof: Image Unavailable, Please Login Retighten as required. I'm a little reluctant to suggest you remove and clean any you find. You may upset a few systems. Computer resets may be required.
Pin 3 is brown, I will check the socket for pin 4 on 31H for the color. I can't get that connector apart, its a pain in the butt. I'll also check the tightness of the grounds and agree, I don't want to mess up the computers anymore than they may be already. I'm still hunting for a radio code after pulling the power cuttoff switch. My radio removal tools will arrive today but we're heading out of town for thanksgiving.
