Freightliner AMT 3 and Mercedes-Benz Automated-Manual Transmissions 26.03 Troubleshooting Without Fault Codes Electrical Pre-Test Procedure Result Action With the ignition switch off, remove the X1 connector from the TCU and check for resistance between pins 7 and 13 (J1939 datalink). Resistance is less than 55 or greater than 65 ohms. Troubleshoot the J1939 datalink. See Freightliner Service Bulletin 54-133 . Resistance is between 55 and 65 ohms. The vehicle has passed the electrical pre-test. Troubleshoot active fault codes, if any. Table 1, Electrical Pre-Test NOTE: To see the identification plate on the TCU it may be necessary to remove the splash guard. DaimlerChrysler 1 Bez:
G 60−6 IdNr 715053 123456 Code C07−00036−031 Var. 041962 2 2 0 0 3 0 0 4 0 0 6 0 0 0 1 4 7 7 000525 5 9 0 3 2 6 0 9 7 0 A 3 5 4 Bez: G 60−6 IdNr 715053 123456 Code C07−00036−031 DaimlerChrysler Var. 041962 1 10/05/2006 f261383 1. Transmission Identification Plate 2. Serial Number 2 10/05/2006 NOTE: The TCU and X-Y Actuator each have their own WABCO identification plate (arrows) with unique serial numbers. 1. TCU (Transmission Control Unit) 2. Splash Guard 3. WABCO Identification Plate f261384 Troubleshooting Tables, No Fault Codes Fig. 2, Transmission Serial Number 4. Serial Number 5. X-Y Actuator In a few cases there will be a definite problem and no J1587 fault code will be sent.
If the engine will not crank and there are no transmission fault codes, see Table 2 . Fig. 1, Serial Numbers for TCU and X-Y Actuator Business Class M2 Workshop Manual, Supplement 20, September 2011 301/4