VALVE GRINDING 6V2526 - Caterpillar

Conditions Which Generate This Code:
Illustration 1 g01379157
Schematic of the speed sensor for the work modeThis diagnostic trouble code is associated with the speed sensor for the work mode. The "FMI 08" means that the ECU has determined that the signal frequency is not within the expected range. The possible causes of this diagnostic trouble code are listed below:
The sensor has failed.
The circuit has intermittent connections or poor connections.
Mechanical devices are loose.
The ECU has failed. This is unlikely.Note: The following test procedure may create other diagnostic trouble codes. Ignore these created diagnostic trouble codes and clear the diagnostic trouble codes when the original diagnostic trouble code has been corrected. Ensure that the diagnostic trouble code of CID 2998 FMI 08 is active before performing this procedure. The engine must be running in order for the diagnostic trouble code to be active.Note: Use a digital multimeter for the measurements in this procedure. Test Step 1. CHECK THE SENSOR.
Turn the disconnect switch and the key start switch to the ON position.
Ensure that the diagnostic trouble code is active.
Disconnect the sensor from the machine harness.Expected Result:The diagnostic trouble code is NO longer active.Results:
OK - The diagnostic trouble code is NO longer active. The sensor has failed.Repair: Replace the sensor. Verify that the new sensor corrected this diagnostic trouble code. The diagnostic trouble code is NOT active.STOP
NOT OK - The diagnostic trouble code remains active. The sensor is not the cause of the diagnostic trouble code. Proceed to Test Step 2.Test Step 2. CHECK FOR A SHORT IN THE HARNESS.
The sensor remains disconnected from the machine harness.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the J1 and J2 machine harness connectors from the Transmission ECU.
At the J1 machine harness connector for the ECU, measure the resistance between contact J1-6 (wire E900-WH) to all other J1 and J2 contacts.
At the J1 machine harness connector for the ECU, measure the resistance between contact J1-7 (wire E901-GN) to all other J1 and J2 contacts.Expected Result:Each resistance measurement is greater than 5000 ohms.Results:
OK - The resistance that is measured is greater than 5000 ohms for each measurement. The harness is correct. The ECU may have failed. Proceed to Test Step 3.
NOT OK - The resistance that is measured is NOT greater than 5000 ohms for each measurement. The machine harness has failed.Repair: There is a short in the machine harness. The short is in the circuit for wire E900-WH or wire E901-GN and the circuit with the low resistance measurement. Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK IF THE DIAGNOSTIC TROUBLE CODE REMAINS
Inspect the harness connectors. Clean the contacts of the harness connectors and check the wires for damage to the insulation that is caused by excessive heat, battery acid, 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