Component description EDC Pin Connection to component ( O =Output , I =Input) 25 Not used 26 Not used 27 Drive stage selection (signal) I 28 Engine speed signal output from control unit (square–wave pulses) O 29 Multiplex signal O 30 CAN-L 31 CAN-H 32 Needle movement sensor (signal) 33 Turbo pressure sensor (supply) O 34 Fuel temperature sensor I 35 Resistor bank 36 Turbo pressure sensor (signal) I 37 Not used 38 Not used 39 Empty fuel switch signal 40 External engine cut-out 41 Intermediate engine speed control ZDR 2 I 42 Not used 43 Not used 44 Resistance group I 45 Drive stage selection (supply) 46 Relay power supply batt.+ (main relay) O 47 Relay power supply n/o contact I 48 Diagnostic connection (K-link) 49 Diagnostic connection (L-link) 50 Not used 51 Resistor bank 3 k W 52 Assigned to batt.+ (to enable multiplex signal) I 53 Coolant temperature sensor I 54 Resistance group 55 Turbo air temperature sensor I 9