Initially The automatic gearbox with torque converter and manual gearbox were two entirely different concepts, they did not even look the same, manual gearbox basics consisted first motion shaft, main shaft, and lay shaft with a free spinning reverse gear which was mechanically pulled into position receiving transmission from a flywheel clutch disc and pressure plate. The automatic gearbox received transmission through a torque converter, solenoids and hydraulics enabled gear selection. The comfortmatic gearbox is basically a manual gearbox with robotic additions added it does require more Driver awareness so the Comfortmatic handbook plays an essential part in the understanding of robotic automatic transmission as it does not operate as a traditional automatic such as Borg Warner. Hope this throws a bit more light onto the subject folks.
21 - 35 of 35 Posts
Hi, folks i have heard of the term no faults were recorded but the diagnostic print out with the VIN number of the vehicle and no diagnostic troubles codes found on all canbus systems message seems never to be presented to customers to endorse the findings of the report printing out the diagnostic results is standard practice. A MIL {malfunction indicator light } illuminates even when a stop lamp is not operating, and that fault is stored within the OBD along with how many times the fault has occurred and the time and that is only a simple stop lamp bulb. Trying to investigate trouble codes as people are experiencing can take an awful lot of time professional workshops included this I know first hand, and yes the causes can be of the simplest things not even component failure, but the time taken to investigate has got to be economically viable. If you were to post the actual symptoms people may be able to help in your dilemma.
Attachments
Here are four typical screen shots of an investigation into the comfortmatic robotic gearbox. 1 select model and type X290 DUCATO. 2 typical recorded faults one in the body controller, and one in the powertrain. 3 the actuators associated with the gearbox. 4 the adjustments this is into the professional territory. This may explain a little or confuse a lot, when a code PO68A-68 is stored it means that the engine / powertrain control module has detected a defect in the de-energizing procedure for the relay which supplies it with voltage. In this case the relay has de-energized too soon, again I am only trying to explain diagnostics and not trying to dishearten folk, having the diagnostic trouble codes can help with the diagnoses, extracting diagnostic trouble codes by a none franchised dealer will most likely effect any warranty, that is why obtaining a diagnostic print out is important.
Attachments
Hi, Every bus which there are up to five on the vehicle CANBUS has sensors which communicate with their appropriate controller which in turn communicates with the other controllers on different buses, the buse's have different speeds of data transfer, some are fault tollerent, some are not. The sensor's are many, ie pressure, speed, temperature, stability, position, [ gear selector ] they are everywhere all communicating. Lets say the sensor on the engine crank pulley or flywheel measuring the rpm of the motor has a resistance caused by a dirty or bad connection the signal or value that it sends to the Engine POwer Controller, code PO, is sent to the other controllers, they interpret that signal to perform their task, looking at this diagnostic print out would show that it would be highly unlikely for three of those sensor's to be faulty more likely to be something common to all of those sensor's GROUND CONNECTION from the engine's harness to the chassis on the Ducato there are rows of these ground points, the gear position sensor's signal looks correct, but the information that the transmission controller has received alters the pressure, or whatever else determines the physical selection of the gear, remember this is a robotic automatic gearbox it is basically a manual gearbox with solenoids, actuators etc which try to simulate the human element of depressing the clutch pedal, and selecting the appropriate gear at the appropriate engine RPM changing down when an incline is approached, the MAF airflow sensor determines the amount of air intake into the engine from the position of your foot on the accelerator drive by wire TPS throttle position sensor, the later Fiat Ducato has a 9 speed conventional automatic gearbox with Torque converter, hope this helps folks, quite logical when explained, if you were to get a puncture in a front tyre before OBD oh dear something not quite right here you feel the unevenness through the steering wheel the steering wheels becomes more difficult to rotate, the vehicle will dip on the corner that is punctured, with OBD the tyre inflation MIL, the ABS MIL, the stability control MIL, the steering angle sensor will all communicate that TPMS receives a signal from ABS the front wheel is not rotating at the same speed as the others as it rolling circumference has altered, stability controllers sensor detects the vehicle is not level , steering angle sensor detects you physically trying to correct the biased your speed may be restricted . I am i child from the analogue world, this is just a different way of thinking it is not rocket science
Check out the updated Comfortmatic posting under the engine and gearbox heading for enhanced confusion
21 - 35 of 35 Posts
