I wonder if someone who understands this diagram better than me can explain wiring in the diagram. Specifically where does the power go whenyou turn the key on to energise the pump. Thanks Image Unavailable, Please Login
From what I know key turns on send power to relay 13 and then to the pump is that write? Also what is relay number 17 for??
No would love to get hands on one. My thinking was same hiwever to confirm some of that I unplugged the two plugs for the F1 in the engine bay and when I turned key on the pump still primmed and shut off. I think I unplugged all F1 connections so ecu should not have know the pressure. Likely the pressure is on the pump and shuts it off like an air compressor works but someone that understands the system better could maybe help. Maybe with keyon first time a relay energises pump, then after the computer re energizes, or the pump has onboard pressure monitoring which I think is more likely. That might explain the extra relay with no description. Relay 17 not sure what it does.
Looking at some of the diagrams posted earlier on the FChat Forum... The pump is controlled by the pump relay. The Transmission Control Unit (TCU) controls the pump relay (it provides power to the solenoid of the relay). TCU pin 48 provides this solenoid power. As far as I can see, the ignition powers up the TCU or rather, some of the lower power circuits in the TCU. The TCU needs some heavier duty power though. After the ignition powers up the lower power circuits, at some point the TCU then activates the TCU Power Up Relay which provides battery power (via the 20 Amp fuse) to the TCU (on pin 1). Hope this makes sense. Caveat: This is the first time I've looked at the circuit and I'm still figuring it out. Cheers Ian
The workshop manual says it's the "starter relay enabling" (relay). I assume the TCU can inhibit the engine starter motor if something is not right with the F1 system. The diode box on top of the relay appears to be some kind of latch for the relay (say, if the TCU power dips too low during the start).
Courtesy of Miroljub... http://www.ferrarichat.com/forum/144961415-post10.html (EDIT) I think the labels on the relays on page 2 may be mixed up, but just follow the relay wiring to the pump/TCU/etc and it should be self-explanatory. Also on page 2... The circular symbol below the pump motor is the ignition switch ("30" is power from the battery. "15" is the normal running position. "50" is the start position). The relay on the left hand side is the starter relay enabling relay. It is controlled by the TCU. The diode setup enables the relay to latch during during cranking.
It would make sense because if the tcu sees a gear the starter will not turn over. When my transmission locked up the gauge read N but was still in gear car woukd start but jump forward. So it gets its feedback fromthe gauge. This is confirmed in the WSM.
Ian would it make sense to you that the pump has pressure sensor onboard so it does not need the tcu to see the pressure?
I don't see any wiring which doesn't involve the TCU. The pressure sensor on the power unit/pump feeds directly to the TCU (pin 18 on the TCU provides power to the sensor, pin 51 receives the sensor output). A third wire on the sensor is an earth. The TCU then controls the pump via the relay. Looking at the workshop manual, the pump (with sensor) and TCU are at the front of the car, so disconnecting plugs in the engine bay perhaps wouldn't affect the pump (priming) function. Cheers Ian
Except it needs the feedback fromthe pump. I figured if unpluged the pump would not activate or the pump would keep pumping. It seemed like it shut off once primed so I figured the sensor was by the pump and no feedback to the tcu was needed. I obviously missed a plug.
Ooops... Sorry... One of the diagrams in the workshop manual gave the impression that the pump was forward of the cockpit. I'll stick to reading wiring diagrams I'll keep looking to see what I can find. Cheers
I wonder if pulling the plug off the pressure sensor simulates low pressure? If the pump motor was still hooked up, perhaps the disconnected sensor plug caused the pump to run?
It's hard to see the components in your wiring diagram. I've never seen one in with my own eyes but from its operating characteristics I can say there are at least two elements in a series logic; the key switch and a pressure switch. When the key is turned, it powers and closes the relay. It in turn closes a set of contact which provides electrical power down the wire leading to the motor. However, the motor doesn't run unless the pressure switch is closed and only does when the hydraulic pump is below a predetermined pressure. Because the pump primes itself after first start up or after a shutdown, I believe the pump system does not hold pressure. My conclusion is based on the fact that the pump goes through the priming stage even when new and not because it's worn out. It is plausible that another timing logic requires the pump to prime itself at first start up to ensure adequate pressure regardless of the state it's in. There maybe other requirement also but need to see the pump system to make that assessment. Image Unavailable, Please Login
Roth... Were you aware the diagram has 3 pages? The second one shows the circuit a little more clearly, plus there are additional elements.
No, only the first blurry page. I can't even indentify the components on it. Can you post all three pages with reference to the numbers ? I'm on an iPad. Probably the reason only one page shows up
Sorry, they're not my diagrams. I've been trying to redraw, label and colour them, but it's very labour intensive and my incentive is a little low (I have a stick shift ). Could take a week or so. The index (numbers and component names) is on the 3rd page. Cheers Ian
Taz can you post three separate pages? Maybe in higher resolution but I understand if you're using a Winslow machine.
As mentioned before, the original poster of the diagrams was Miroljub Stojanovic Here's my first attempt to make it iPad compatible... http://www.members.iinet.net.au/[email protected]/FerrariF355Spider/F355F1WiringSchematic.gif Let me know if any of the numbers are illegible. The colour codes are standard Ferrari. Cheers Ian.
