HOLDER 2V7452 - Caterpillar

Illustration 1 g02751137
Location of the Left Front Drive Motor Speed Sensor (Drum)
Illustration 2 g02716139
Connections of the Left Front Drive Motor Speed Sensor (Drum)This diagnostic code is associated with the Left Front Drive Motor Speed Sensor #1 (Drum). The FMI 08 means that the ECM has detected that signal frequency or signal pulse width or the period of the signal is abnormal. The possible causes of this failure are listed below:
The sensor has failed.
The signal circuit #1 of the sensor is shorted to a voltage source.
The signal circuit #1 of the sensor is shorted to ground.
The ECM has failed. This situation is unlikely.Note: Before performing this procedure, inspect the harness connectors that are involved in the circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all connections in the circuit are clean and secure. Verify that all connections in the circuit are in good condition. If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing this procedure. After making any possible fix to the circuit, cycle the Key Switch in order to determine if the Diagnostic Code still exists. Some Diagnostic Codes may not display until the engine is running. Verify that the CID 2319 FMI 08 is active before performing this procedure.Use a digital multimeter for the measurements in this procedure.System Response:A Level 2 warning is generated.Test Step 1. INSPECT THE SENSOR
Perform a visual inspection of the sensor, the wiring for the sensor and the hardware that is associated with the sensor.Expected Result:There is no apparent damage to the sensor, the wiring for the sensor or the hardware that is associated with the sensor.Results:
OK - There is no apparent damage to the sensor, the wiring for the sensor or the hardware that is associated with the sensor. Proceed to Test Step 2.
NOT OK - There is apparent damage to the sensor, the wiring for the sensor or the hardware that is associated with the sensor. Repair: Replace the damaged part.STOPTest Step 2. CHECK FOR POWER AT THE SENSOR
Do not disconnect the harness connector from the sensor.
At the back of the harness connector for the sensor, insert a 7X-1710 Multimeter Probe along the voltage supply wire J852-OR (contact 1).
Turn the key start switch and the disconnect switch to the ON position.
Measure the voltage from contact 1 (wire J852-OR) to frame ground.Expected Result:The voltage is 8 1.0 VDC.Results:
OK - The voltage is 8 1.0 VDC. Proceed to Test Step 3.
NOT OK - The voltage is not 8 1.0 VDC. The circuit is open. Repair: Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK FOR PROPER GROUND AT THE SENSOR
The machine harness remains connected to the sensor.
Turn the key start switch and the disconnect switch to the OFF position.
Remove the 7X-1710 Multimeter Probe from the voltage supply wire J852-OR (contact 1).
At the back of the harness connector for the sensor, insert a 7X-1710 Multimeter Probe along the ground