I found this post on another forum after looking on here for 2 hours Thought i would share the function of the sensor for the F1 that sits under our gearboxes. I think I must be the only one needing these sensors in bulk. Last year i had to replace it because of a large hole in a drive through and i did not take it at an angle. This year i was having a very spirited drive and I bottomed the car out hard enough that the sensor got pushed in and cracked the bottom case and the sensor lightly touched the gear. The actuator was not hit. It appeared the sensor was ok so I did not replace it. Now the interesting part, the sensor i believe was still partially working because the F1 functioned fine under slow accelarations, ie below 6500 rpm and with the throttle not floored. Under full throttle and above 6500 it would shift then apply the clutch for a very brief period and then release it making for a very jerky shift. It would only do this under a full throttle above 6500 shift. You would not know it was malfunctioning under less abbusive driving conditions. It says this nowhere i could find but this does happen. Replacd sensor and all is perfect again.
I thought I would post this because maybe this is my current problem Even though the sensor was not hit or damaged maybe a wire is causing grief. in the past the f1 brotherhood has speculated this sensor is mostly used for when car is stopped to ensure reverse can not be engaged while moving and for the f1 to autodownshift if stopped and in a gear higher than 1 I originally thought it had to do with ignition either spark or fuel but after checking all those this could be possible. Will keep you posted I need to consult Ian’s wiring diagram which is awesome by the way. Thanks Ian
Can't? I was just going to say the same thing. Are we talking about this sensor? Image Unavailable, Please Login
There are two F1 wiring diagrams in the WSM and neither show a "gearbox input shaft revolution sensor"... only these sensors: Throttle position sensor (Sometimes it's called an "accelerator pedal sensor" but it's on the engine) Engagement and Control Actuator (with position feedback) : on gear selection actuator Clutch position sensor Hydraulic pressure sensor Oddly, the WSM does mention and show 5 sensors. There are also car speed and engine speed sensors, but they are found on all F355's, not just the F1. Looking at the wiring diagrams, there are 11 pins on the TCU which don't have any wires attached to them: 6, 7, 8, 19, 26, 40, 42, 44, 45, 46 & 54. I don't have any paper wiring diagrams for the F1 which may have shown the missing wiring.
The F360 and F430 have the same sensor and the wiring diagrams show the sensor (Their TCU has two plugs, however, so no wiring match up to the 355F1) Image Unavailable, Please Login Part number #168729 Image Unavailable, Please Login 3 -pin plug (on F360): 1) black wire - goes to earth (perhaps for shielding) 2) purple/black wire - to TCU 3) green wire - to TCU
Does anyone have the wiring diagram for the clutch position sensor? What readings I'm supposed to get in each pin of the socket. There are 5 pins with 5 wires. Want to know the value of resistances or voltage values in the pins.
Is it a 6 pin plug with 5 wires? Looking at the labelling in the WSM diagram, it suggests that the sensor has redundant/duplicate outputs: Image Unavailable, Please Login Pin 5 is the shield, 6 is unused. The other 4 pins may be paired together (P1 & P2 or P1 & S1, etc). "S" may be sensor output (?). "P" may be power (?). I would check for dc voltage (on the other 4 pins) on the Interface Unit side of the plug (with the ignition switched on and the sensor disconnected). If two particular pins have power, then compare the resistances between these two power pins and the other pins on the Position Sensor side of the plug. See if a pattern emerges.
Ye Yes it's a 6pin plug with 5 wires/pins. When you say 5 is the shield you mean it's in contact with ground right? I'll check out the other things you mentioned. Any idea how I would know if the sensor is out of commission? No resistance on either of the pairs of the pins? Thank you for the information. Greatly appreciated.
Looking at the diagram, it seems to be. The ground is on the Clutch Position Interface Unit side of the plug. You won't get a ground if the 5-pin plug is disconnected and you're checking the wiring on the Clutch Position Sensor. If you can establish the power pins (if there are any), see if the resistance readings on the sensor are the same on both power/signal "pairs". One may be broken, one may be ok. Maybe the readings change when the car is started ? Unfortunately, I don't know if the sensor is inductive, resistive or whatever. What is currently wrong with the car?
