Mercedes-Benz Automated Manual Transmission Guide (EN)

Freightliner AMT 3 and Mercedes-Benz Automated-Manual Transmissions 26.03 General Troubleshooting IMPORTANT: Always use ServiceLink when at- tempting to diagnose problems with the AGS (Automated Gear Shift) transmission. But in most cases, the J1587 fault code is the start- ing point for the troubleshooting procedures. See Table 1 to find information for SID fault codes. See Table 2 to find information for PID fault codes. How To Start Before starting any procedures, use ServiceLink to depressurize the AGS hydraulic system. For detailed procedures, see Subject 160 .

To gain a baseline for troubleshooting when there is no definite problem, when the malfunction is erratic or intermittent, or to determine the general health of the electrical system, start with the electrical pre-test in Subject 301 . Fault Code Guide To troubleshoot a given fault code, look up the sub- ject number in Table 1 (for SIDs) and Table 2 (for PIDs). Follow the procedures for that fault code until the fault is corrected. In a few cases there will be a definite problem and no J1587 fault code will be sent (engine will not crank, no information on gear display, fluid level fault). For these problems, see the appropriate table in Subject 301 .

Fault Code Guide (MID 130 SIDs) SID FMI Text Message Failure Reason Procedure 33 03 MultiPress Ind Short Hi The hydraulic pressure sensor circuit is shorted to power. See Subject 303 . 18 02 Prim Selector Erratic The shift lever does not shift gears. See Subject 302 . 33 04 MultiPress Ind Short Lo The hydraulic pressure sensor circuit is shorted to ground. See Subject 303 . 33 05 MultiPress Ind OPEN The hydraulic pressure sensor circuit is open. See Subject 303 . 52 05 Hydraulic Sys OPEN The hydraulic pump circuit is open. See Subject 304 . 52 07 Hydraulic Sys NoRESPONSE The hydraulic pressure does not increase even though the hydraulic pump is activated. See Subject 304 .

52 11 Clutch Act Not Known The hydraulic pump temperature is too high. See Subject 304 . 55 00 Clutch Act HIGH The clutch is too hot. See Subject 305 . 55 07 Clutch Act NoRESPONSE The clutch does not operate properly. See Subject 305 . 55 13 Clutch Act Calibrate The clutch needs to be calibrated. See Subject 305 . 231 02 SAE J1939 Datalink Erratic The J1939 datalink is not communicating properly. See Subject 306 . 231 09 SAE J1939 Datalink UPDATE The J1939 datalink has timed out. See Subject 306 . 231 12 SAE J1939 Datalink Bad The J1939 datalink is not communicating with the transmission. See Subject 306 . 251 00 POWER SUPPLY HIGH The power supply voltage is too high. See Subject 307 .

251 01 POWER SUPPLY Low The power supply voltage is too low. See Subject 307 . 251 05 POWER SUPPLY OPEN There is no power to the transmission with the engine running. See Subject 307 . 251 14 POWER SUPPLY RSRVD The power supply is not properly grounded. See Subject 307 . 253 02 Calibration Memory Erratic The transmission needs to be recalibrated. See Subject 308 . 253 12 Calibration Memory Bad The transmission needs to be recalibrated. See Subject 308 . 253 13 Calibration Memory Calibrate The transmission needs to be recalibrated. See Subject 308 . 253 14 Calibration Memory RSRVD The transmission needs to be recalibrated. See Subject 308 .

Business Class M2 Workshop Manual, Supplement 20, September 2011 300/1

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Freightliner AMT 3 and Mercedes-Benz Automated-Manual Transmissions 26.03 General Troubleshooting Fault Code Guide (MID 130 SIDs) SID FMI Text Message Failure Reason Procedure 254 04 Controller Short Lo The TCU is shorted to ground. See Subject 309 . 254 05 Controller OPEN The TCU has an open circuit. See Subject 309 . 254 11 Controller Not Known The TCU AUTO mode software module has an error. See Subject 309 . 254 12 Controller Bad The TCU has a hardware problem. See Subject 309 . 254 13 Controller Calibrate The TCU has a software memory problem. See Subject 309 .

Table 1, Fault Code Guide (SIDs) Fault Code Guide (MID 130 PIDs) PID FMI Text Message Failure Reason Procedure 33 02 Erratic The clutch position sensor gives invalid data. See Subject 310 . 33 03 Short Hi The clutch position sensor circuit is shorted to power. See Subject 310 . 33 04 Short Lo The clutch position sensor circuit is shorted to ground. See Subject 310 . 33 05 OPEN The clutch position sensor circuit is open. See Subject 310 . 33 14 RSRVD The clutch position sensor gives incorrect resistance readings. See Subject 310 . 59 02 Shift FNGR Gear Erratic The shift rod position sensor gives invalid data. See Subject 311 .

59 03 Shift FNGR Gear Short Hi The gear position sensor circuit is shorted to power. See Subject 311 . 59 04 Shift FNGR Gear Short Lo The gear position sensor circuit is shorted to ground. See Subject 311 . 59 05 Shift FNGR Gear OPEN The gear position sensor circuit is open. See Subject 311 . 59 14 Shift FNGR Gear RSRVD The gear position sensor gives incorrect resistance readings. See Subject 311 . 60 02 Shift FNGR Rail Erratic The rail position sensor circuit gives invalid data. See Subject 312 . 60 03 Shift FNGR Rail Short Hi The rail position sensor circuit is shorted to power. See Subject 312 . 60 04 Shift FNGR Rail Short Lo The rail position sensor circuit is shorted to ground.

See Subject 312 . 60 05 Shift FNGR Rail OPEN The rail position sensor circuit is open. See Subject 312 . 60 14 Shift FNGR Rail RSRVD The rail position sensor gives incorrect resistance readings. See Subject 312 . 64 09 Dir Switch Update The output shaft speed sensor is not providing accurate directional information. See Subject 313 . 64 11 Dir Switch Not Known The output shaft speed sensor is not providing accurate directional information. See Subject 313 . 158 00 Volts (BattSw) HIGH The voltage in the ignition power circuit is too high. See Subject 314 . 158 01 Volts (BattSw) Low The voltage in the ignition power circuit is too low. See Subject 314 .

161 02 In shaft SPEED Erratic The input shaft speed sensor circuit gives invalid data. See Subject 315 . 161 03 In shaft SPEED Short Hi The input shaft speed sensor circuit is shorted to power. See Subject 315 . 161 04 In shaft SPEED Short Lo The input shaft speed sensor circuit is shorted to ground. See Subject 315 . 161 05 In shaft SPEED OPEN The input shaft speed sensor circuit is open. See Subject 315 . 161 08 In shaft SPEED Update The input shaft speed sensor circuit is broadcasting an abnormal frequency. See Subject 315 . Business Class M2 Workshop Manual, Supplement 20, September 2011 300/2

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Freightliner AMT 3 and Mercedes-Benz Automated-Manual Transmissions 26.03 General Troubleshooting Fault Code Guide (MID 130 PIDs) PID FMI Text Message Failure Reason Procedure 163 02 RANGE Attained Erratic The gears do not shift properly. See Subject 316 . 162 02 RANGE Selected Erratic The transmission is not properly calibrated. See Subject 316 . 191 02 OUTPUT SPEED Erratic One or both of the output shaft speed sensor circuits give invalid data. See Subject 317 . 191 05 OUTPUT SPEED OPEN One or both of the output shaft speed sensor circuits are open. See Subject 317 . 191 08 OUTPUT SPEED SIGNAL There is no signal coming from one or both output shaft speed sensors. See Subject 317 .

191 14 OUTPUT SPEED RSRVD The output shaft speed sensor is providing invalid data. See Subject 317 . Table 2, Fault Code Guide (PIDs) Business Class M2 Workshop Manual, Supplement 20, September 2011 300/3

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Freightliner AMT 3 and Mercedes-Benz Automated-Manual Transmissions 26.03 Troubleshooting Without Fault Codes IMPORTANT: Always use ServiceLink when at- tempting to diagnose problems with the auto- mated gear shift (AGS) transmission. Use the electrical pre-test instructions given in Table 1 as a baseline for troubleshooting when there is no definite problem, the malfunction is erratic or intermittent, or as an informational step to determine the general health of the electrical system. To record your findings, a result sheet is provided at the end of this subject. For locations of serial numbers, see Fig. 1 and Fig. 2 .

In most cases, the J1587 fault code is the starting point for the troubleshooting procedures. See Sub- ject 300 for a list of fault codes and the location of troubleshooting procedures for each code. Electrical Pre-Test Instructions Before starting any procedures, use ServiceLink to depressurize the AGS hydraulic system. For detailed procedures, see Subject 160 . Procedure Result Action Electrical Pre-Test Make sure that the selector switch on the SmartShift lever is set to N. Turn on the ignition switch to power up the transmission. The current gear indicator does not power up normally. No fault codes display. Troubleshoot the current gear indicator. See Table 4 . NOTE:

If the hydraulic pump starts up with its characteristic humming noise, this means the main power cables are OK (see the steps below to check the X3 connector). The current gear indicator goes through its normal power-up sequence, ending by displaying "N." Turn off the ignition switch and go to the next row in the table. With the ignition switch off, check the voltage at the battery. Voltage is less than 11 or greater than 13 volts. Charge or replace the battery. For battery charging procedures, see Section 54.12 , Subject 150. Voltage is between 11 and 13 volts. Go to the next row in the table. Remove the X3 (electric motor 2-pin) connector from the transmission control unit (TCU).

Check the electric motor power circuit. 1 2 06/01/2004 f544485 X3 Check for voltage between pin 1 (power circuit 232) of the X3 connector and 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 301/1

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