PLANETARY GP-FINAL DRIVE 2925373 - Caterpillar

Illustration 1 g02703779
Connections of the "transmission output speed sensor 2"This diagnostic code is associated with the output speed sensor 2. This sensor produces a square wave output. 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: The diagnostic code will not be cleared until the machine has been driven.The sensor has a hall cell at one end that is placed just above the gear teeth in the transmission. The sensor sends a two state current waveform to the ECM as the gear teeth pass the hall cell. The frequency is proportional to the speed of the transmission. The possible causes of this diagnostic code are listed below:
The supply voltage has failed
The sensor has failed.
The spacing of the sensor is incorrect.
Intermittent connections or poor connections
Mechanical devices are loose.
The ECM has failed. This condition is unlikely.Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear these diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 0673 FMI 08 is active before performing this procedure.Note: Use a digital multimeter that has been calibrated for the measurements in this procedure.Test Step 1. CHECK THE VOLTAGE AT THE SENSOR
Disconnect the machine harness from the sensor.
Turn the disconnect switch and the key start switch to the ON position.
At the machine harness connector for the sensor, measure the voltage between contact 1 (wire J850-WH) and contact 2 (wire F914-YL).Expected Result:The voltage is 8 0.5 VDC.Results:
OK - The voltage is approximately 8 0.5 VDC. Proceed to Test Step 4.
NOT OK - The voltage is NOT approximately 8 0.5 VDC. Proceed to Test Step 2.Test Step 2. INSPECT THE HARNESS CONNECTIONS
Turn the disconnect switch and the key start switch to the OFF position.
Inspect all harness connections that are related to the sensor. Make sure that the connectors are clean and tight.
Check the connectors for proper mating. Ensure that all the seals are present and in place.
Check the harness for signs of damage or abrasion.
Check the wires at the connector. Ensure that the wires are secured tightly into the connector.
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit. Take care not to pull the wire out of the connector.
Check the exposed wires at the connectors for nicks or signs of abrasion.
Check for moisture inside the connector.
Check the connectors for dirty contacts or corroded contacts.
Check each pin and each socket of the machine harness connectors. Ensure that the contacts are properly installed. The contacts should mate correctly when the two pieces of the connector are placed together.Expected Result:The machine harness connectors are tight and free of corrosion.Results:
OK - The machine harness connectors are tight and free of corrosion. Proceed to Test Step 3.
NOT OK - The machine harness connectors are in need of repair.Repair: Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK THE CIRCUIT FOR AN