Freightliner AMT 3 and Mercedes-Benz Automated-Manual Transmissions 26.03 Output Shaft Speed Sensor Faults (PID 191) 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 active fault codes in MID 136 (ABS). Active MID 136 fault codes are found. Troubleshoot the ABS system (see the applicable section in Group 42 ). Table 2, The Output Shaft Speed Sensor Is Providing Invalid Data Business Class M2 Workshop Manual, Supplement 20, September 2011 317/3