Freightliner AMT 3 and Mercedes-Benz Automated-Manual Transmissions 26.03 Troubleshooting Without Fault Codes Electrical Pre-Test Procedure Result Action Check for resistance between pin 2 (ground) of the X3 connector and the battery ground terminal. Resistance is greater than 0.3 ohms. Repair or replace the wiring as needed. See Section 54.06 , Subject 100. Resistance is 0.3 ohms or less. Go to the next row in the table. Remove the X1 (vehicle 21-pin) connector from the transmission control unit (TCU). Check the battery power circuit.
20 21 17 18 14 15 12 11 8 9 6 5 2 3 19 16 13 10 7 4 1 07/16/2004 f544483b X1 Check for voltage from pins 12 and 15 (battery power circuit 232D) of the X1 connector to the battery ground terminal. Voltage drops more than 0.2 volts from the voltage measured at the battery. Repair or replace the wiring as needed. See Section 54.06 , Subject 100. Voltage is within 0.2 volts of the voltage measured at the battery. Go to the next row in the table. Turn on the ignition switch. Check the ignition power circuit. 21 18 15 12 9 6 3 20 17 14 11 8 5 2 19 16 13 10 7 4 1 X1 07/16/2004 f544483c Check for voltage from pin 9 (ignition power circuit 232E) of the X1 connector to the battery ground terminal.
Voltage drops more than 0.2 volts from the voltage measured at the battery. Repair or replace the wiring as needed. See Section 54.06 , Subject 100. Voltage is within 0.2 volts of the voltage measured at the battery. Go to the next row in the table. Business Class M2 Workshop Manual, Supplement 20, September 2011 301/2