CAN gear range selector E330 CAN warning
|  | Description
|  | Effects on the driving operation
|  | Possible causes
|  | Connection of the CAN gear selector switch
|  | Connector pin assignment of transmission control unit
|  | Connector pin assignment of CAN gear selector switch
|  | Place of action
|  | Instruction
|  | Setting conditions of the event
|  | Test conditions of the event
|  | Troubleshooting
|  | Final function check
|  | See also:
Description Communication on the CAN bus is disturbed due to ´CAN warning´ conditions. A ´CAN warning´ is caused by a CAN controller receiving too many invalid data. A CAN controller in warning condition can still read data from the CAN bus but it can no longer send data. The warning condition is automatically cancelled once the CAN controller has received a certain percentage of valid data. Effects on the driving operation Transmission shifts sporadically to neutral. Lighting of the gear range selector becomes dark. Possible causes CAN bus incorrectly terminated (bus terminating resistor). There is a cable break, loose contact or too high contact resistance in the CAN cabling. Connection of the CAN gear selector switch The jumpers on the transmission control unit (D13 to D17) and on the CAN gear range selector (6 to 7) activate the integrated CAN terminating resistors since the transmission control unit and the CAN gear range selector are usually the only CAN bus nodes at CAN2. The CAN bus must always be wired with the terminating resistors on both sides. Connector pin assignment of transmission control unit
Pin | Stecker A | Stecker B | Stecker C | Stecker D
1 | SHIELD | EK | FLEXI-1 | -BATT
2 | TIM+ | DK | --- | IGN
3 | TIM- | SK | FLEXI-3 | FLEXI-11
4 | N1+ | RBK | FLEXI-4 | K-LINE
5 | N1- | TB | FLEXI-5 | CAN1-H
6 | N2+ | --- | FLEXI-6 | CAN1-H
7 | N2- | RBG | FLEXI-7 | CAN-SHLD
8 | N3+ | PB | FLEXI-8 | CAN1-L
9 | N3- | WR | FLEXI-9 | CAN1-L
10 | --- | WP | FLEXI-10 | CAN2-H
11 | --- | --- | FLEXO-2H | CAN2-H
12 | EKM | FLEXI-12 | FLEXO-4H | CAN2-L
13 | DKM | S-GND | FLEXO-3H | CAN2-L
14 | SKM | OIL-LVL | FLEXO-5L | CAN1-R
15 | PBM | T-SUMP | --- | ---
16 | TBM | --- | --- | FLEXO-1L
17 | RBKM | T-CONV | --- | CAN2-R
18 | MVM-GND | MV-GND | --- | +BATT
Connector pin assignment of CAN gear selector switch
Pin | Name | Pin | Name | Pin | Name
1 | IGN | 6 | CAN-H | 11 | FLEXI-4
2 | -BATT | 7 | CAN-R | 12 | FLEXI-5
3 | CAN-L | 8 | FLEXI-1 | 13 | FLEXI-6
4 | CAN-L | 9 | FLEXI-2 | 14 | FLEXO-1H
5 | CAN-H | 10 | FLEXI-3 |  |
Place of action No description available. Instruction Check the cabling (cable break, loose contact, high contact resistance). Measure between CAN-H and CAN-L: the resistance must be approx. 60 ohms - install / repair bus terminating resistor if necessary. Setting conditions of the event No description available. Test conditions of the event No description available. Troubleshooting
|  | NOTE The following service work may only be performed by persons who are authorised by the vehicle manufacturer: Loading software and/or datasets into the transmission control unit. Service work at vehicle components which are not included in the VOITH delivery.
Measure resistance between CAN-H and CAN-L. The nominal value is 60 Ω. A terminating resistor of 120 Ω each is installed at each end of the CAN bus.The two terminating resistors together yield a parallel connection resistance of 60 Ω. Check CAN wiring including plug-in connectors for loose contact and contact resistances. 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)