Freightliner AMT 3 and Mercedes-Benz Automated-Manual Transmissions 26.03 Output Shaft Speed Sensor Faults (PID 191) PID 191, FMI 02, 05, 08—The Output Shaft Speed Sensor Circuit Gives Invalid Data, Is Open, or Not Broadcasting a Signal Failure Reason: The TCU has a hardware prob- lem. The sensor is mounted too loose (air gap too big). 1 4 7 10 13 The sensor connectors are dam- aged or bent. 2 5 8 11 14 The wiring harness has had an electrical failure. 3 6 9 12 15 X2 Either one of the sensors or the TCU has failed. 07/16/2004 f544484k Procedure Results Action Using a sensor known to be good, replace each sensor in turn (see Subject 120 for procedures). The fault becomes inactive.
No further action needed. The fault is still active. Contact Mercedes-Benz Transmissions Service Support with the AGS codes and results of the electrical pre-test. NOTE: One hour of troubleshooting time is alloted for printing the AGS codes and completing the electrical pre-test. 1. Using ServiceLink, print the AGS codes (130). 2. Complete the electrical pre-test result sheet in Subject 301 . 3. With the results, contact Mercedes- Benz Transmissions Service Support by fax (503.961.8435), email (MBTServiceSupport@ Freightliner.com), or phone (503.745.4965 or 503.745.4988).
Table 1, The Output Shaft Speed Sensor Circuit Gives Invalid Data, Is Open, or Not Broadcasting a Signal PID 191, FMI 14—The Output Shaft Speed Sensor Is Providing Invalid Data Failure Reason The antilock brake system (ABS) is not broadcasting wheel speed data. There is a defective output shaft speed sensor. Procedure Result Action Check for other PID 191 fault codes. Other PID 191 fault codes are active. Troubleshoot PID 191. See Table 1 . No other PID 191 fault codes are active. Go to the next step in the table. Business Class M2 Workshop Manual, Supplement 20, September 2011 317/2