Safety computer Warm start resistant memory cell defective
|  | Description
|  | Effects on the driving operation
|  | Possible causes
|  | Function of the safety computer
|  | Place of action
|  | Instruction
|  | Setting conditions of the event
|  | Test conditions of the event
|  | Final function check
|  | See also:
Description Memory location for watchdog test defective. The watchdog test is located in a certain memory cell of the RAM (warm-start-resistant memory cell defective). Effects on the driving operation Driving operation is blocked for safety reasons. The transmission assumes a safe state. Possible causes Internal fault of the safety computer Function of the safety computer The safety computer (S-CPU) monitors safety-relevant signals which the function computer (F-CPU) sends or receives. If the safety computer detects an inadmissible condition, it initiates a reset of the function computer. During that time, the transmission system is in a safe mode (neutral). Driving operation is only released if both the function computer AND the safety computer give their approval simultaneously. After the release the safety switch in the transmission control unit is closed and the ground of the solenoid valves is connected to the battery ground. Only then can the solenoid valves be activated and enable driving operation.
|  |  |  | monitored signal private CAN (gear selection)
S-CPU |  |  | N1 / N2 | monitored speeds
ALIVE | alive signal of F-CPU to S-CPU |  | MV | monitored actuation of all solenoid valves
COMM | communication between F-CPU and S-CPU |  | MV-GND | ground applied by safety switch
|  |  | -BATT | battery ground
Place of action No description available. Instruction Should the fault not disappear, please contact the VOITH customer service. Setting conditions of the event No description available. Test conditions of the event No description available. Final function check If the defective component cannot be clearly identified, you should try to reproduce the fault: Reinstall the component in the vehicle. Test the function. After the fault has been eliminated, the following steps have to be carried out: Conduct a test drive with function check. Read out the fault memory. Check the transmission for leaks. Perform a final visual inspection. These steps are necessary to ensure the entire vehicle functions. See also:
|  | Aftersales service index
© by Voith Turbo GmbH & Co. KG, S. Brunnengräber send remarks to stefan.brunnengraeber@voith.com (documentation department)