LINK CASTING 9J5785 - Caterpillar

Illustration 1 g02653956
Connections of the Transmission Input Speed Sensor
This diagnostic code is associated with the Transmission Input Speed Sensor. The FMI 08 means that the ECM has determined that the signal frequency or the signal pulse width is not within the expected range.Note: Failures of the transmission input speed sensor will be recorded only while the machine is moving.Possible causes of this diagnostic code are listed:
There is a malfunction or misalignment of the sensor.System Response:The machine response is listed:
Transmission shifting may be harsh.
Shift hesitation during directional shifts.Test Step 1. CHECK THE RESISTANCE OF THE SENSOR.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness from the speed sensor.
Measure the resistance between contacts 1 and 2 of the connector for the speed sensor. Expected Result:The resistance should be between 800 and 1800 ohms.Results:
YES - The speed sensor has not failed. Proceed to Test Step 2.
NO - The speed sensor failed.Repair: Replace the speed sensor.STOPTest Step 2. CHECK THE SIGNAL CIRCUIT FOR AN OPEN IN THE MACHINE HARNESS.
The key start switch and the disconnect switch remain in the OFF position.
The key start switch and the disconnect switch remain in the OFF position.
Disconnect machine harness connectors J1 and J2 from the Transmission ECM.
Measure the resistance from the sensor signal J1-15 wire (E908-BR(Brown)) to the return contact J1-16 wire (E909-WH(White)) of the machine harness. Expected Result:There should be continuity (less than 5.0 Ohms resistance).Results:
YES - The machine harness is correct. Proceed to Test Step 3.
NO - There is an open circuit in the machine harness (wire E908-BR(Brown) or wire E909-WH(White)).Repair: Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK THE SIGNAL FOR A SHORT.
Remove the jumper between contact 1 and contact 2 for the machine harness connector for the speed sensor.
Reconnect the speed sensor to the machine harness.
At the J1 and J2 harness connectors, measure the resistance between J1-15 and all possible sources of positive voltage and ground.
Repeat the previous Test Step for contact J1-16. Expected Result:Each resistance should be greater than 5000 Ohms.Results:
YES - The machine harness is correct. Proceed to Test Step 4.
NO - There is a short in the machine harness. The short is between the signal circuit (wire E908-BR(Brown) or wire E909-WH(White)) and the circuit with low resistance.Repair: Repair the machine harness or replace the machine harness.STOPTest Step 4. CHECK IF THE DIAGNOSTIC CODE REMAINS.
Inspect the harness connectors. Clean the contacts of the harness connectors. Check the wires for damage to the insulation that is caused by excessive heat, corrosion, or chafing.
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit.
Reconnect all harness connectors in order to make sure that the connectors are fully seated. Also, make sure that the clips for each connector are fastened.
Turn the disconnect switch and the key start switch to the ON position.
Operate the machine.
Drive the machine.
Determine if the diagnostic code is active. Expected Result:The diagnostic code is active.Results:
YES - The diagnostic code is active. The