SEAL-LIP TYPE 7K5191 - Caterpillar

Transmission ECM
The following is a list of diagnostic codes that are associated with the Speed Sensors of the machine.
Table 1
Transmission ECM (MID 27)    
DTC    Code Description    System Response    
585-2     Transmission Output Speed Sensor #1 : Data Erratic, Intermittent, or Incorrect     Transmission shifting may be harsh
Shift hesitation during directional shifts
A Warning Level 1 Will Be Generated    
669-2     Transmission Input Speed Sensor : Data Erratic, Intermittent, or Incorrect     Transmission shifting may be harsh
Shift hesitation during directional shifts
A Warning Level 1 Will Be Generated    
673-2     Transmission Output Speed Sensor #2 : Data Erratic, Intermittent, or Incorrect     Transmission shifting may be harsh
Shift hesitation during directional shifts
A Warning Level 1 Will Be Generated    
674-2     Transmission Intermediate Speed Sensor #1 : Data Erratic, Intermittent, or Incorrect     Transmission shifting may be harsh
Shift hesitation during directional shifts
A Warning Level 1 Will Be Generated    
675-2     Transmission Intermediate Speed Sensor #2 : Data Erratic, Intermittent, or Incorrect     Transmission shifting may be harsh
Shift hesitation during directional shifts
A Warning Level 1 Will Be Generated    
3810-2     Transmission Intermediate Speed Sensor #3 : Data Erratic, Intermittent, or Incorrect     Transmission shifting may be harsh
Shift hesitation during directional shifts
A Warning Level 1 Will Be Generated    Possible causes for an FMI 2 Diagnostic codes are:
The sensor has failed
The spacing of the sensor is incorrect
Intermittent connections or poor connections
Mechanical devices are loose
Incorrect software is loaded to the ECM
The ECM has failed. ECM failure is unlikely
Illustration 1 g03651652
Transmission ECM J1 Speed SensorsNote: The diagram above is simplified schematic of the Transmission ECM connections. The schematic is electrically correct. However, not all of the possible harness connectors are shown. Refer to the latest revision of Electrical Schematic, UENR3921 for the complete schematic.Diagnostic Trouble Code Procedure
Note: Prior to beginning this procedure, inspect the harness connectors that are involved in this circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all connections in the circuit are clean, secure, and in good condition. If a problem with a connection is found, correct the problem and verify that the diagnostic code is active before performing a troubleshooting procedure. For sensors powered via the fuse panel, check the condition of the appropriate fuse before beginning the troubleshooting procedure.
Table 2
Troubleshooting Test Steps    Values    Results    
1. Identify Active DTC Code Associated With Sensor Circuit    
Code present     FMI 2 diagnostic code, proceed to Test Step 2.
   
Begin Process For FMI 2 Troubleshooting HERE    
2. Check The Resistance Of The Sensor
A. Turn the key start switch and the disconnect switch to the OFF position
B. Disconnect the machine harness from the speed sensor
C. Measure the resistance between contacts 1 and 2 of the connector for the speed sensor    
The resistance should be between 800 and 1800 Ω     OK -The speed sensor has not failed
Proceed to Test Step 3.
NOT OK -The speed sensor failed
Repair:Replace the speed sensor
STOP    
3. Check The Signal