Fault Code Guide

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).
• The sensor connectors are dam-
aged or bent.
• The wiring harness has had an
electrical failure.
• Either one of the sensors or the
TCU has failed.
07/16/2004 f544484k
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
X2
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 [phone]), 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.
Freightliner AMT
3
and Mercedes-Benz Automated-Manual
Transmissions
26.03
Output Shaft Speed Sensor Faults (PID 191)
Business Class M2 Workshop Manual, Supplement 20, September 2011317/2