STARTING MOTOR GP-ELECTRIC 5206649 - Caterpillar

Illustration 1 g01428314
Schematic of the Pressure Sensor for the Rod End of the Boom Cylinder This diagnostic code is associated with the Pressure Sensor for the Rod End of the Boom cylinder. The FMI 08 diagnostic code means that the Machine ECM has determined that the signal frequency or pulse width is not within the expected range.The Pressure Sensor at the Rod End has an output frequency of approximately 500 Hz. The duty cycle of the signal changes as the position of the Rod End of the Boom Cylinder is changed. The duty cycle varies from approximately 19% at the minimum position to approximately 77% at the maximum position. The duty cycle is approximately 48% at the center position.The possible causes of this diagnostic code are listed below:
The Pressure Sensor at the Rod End has failed.
Intermittent connections or poor connections
The ECM has failed. This situation is unlikely.Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear the diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 1968 FMI 08 is active before performing this procedure.Note: Use the 146-4080 Digital Multimeter or the equivalent for the measurements in this procedure. Test Step 1. CHECK FOR POWER AT THE PRESSURE SENSOR AT THE ROD END.
Do not disconnect the harness connector from the joystick.
Turn the key start switch and the disconnect switch to the ON position.
At the back of the harness connector for the joystick, insert a 7X-1710 Multimeter Probe along the voltage supply wire 308-YL.
Measure the voltage from the voltage supply wire (308-YL) to frame ground.Expected Result:The voltage is approximately 8 VDC.Results:
OK - The voltage is approximately 8 VDC. Proceed to Test Step 2.
NOT OK - The voltage is not approximately 8 VDC. The circuit is open. Repair: Repair the machine harness or replace the machine harness.STOPTest Step 2. CHECK THE SIGNAL CIRCUIT OF THE PRESSURE SENSOR AT THE ROD END FOR THE CORRECT DUTY CYCLE.
Turn the key start switch and the disconnect switch to the OFF position.
At the back of the harness connector for the sensor, remove the 7X-1710 Multimeter Probe from the supply wire (308-YL) and insert the probe along the signal wire E411-YL.
At the back of the harness connector for the sensor, insert a 7X-1710 Multimeter Probe along the ground wire A209-BK .
Turn the disconnect switch and the key start switch to the ON position.
Monitor the duty cycle of the Pressure Sensor at the Rod End with the 146-4080 Digital Multimeter .
Without disconnecting the joystick or the hardware associated with the joystick from the machine, move the Joystick control through the entire range of motion.Note: On some machines, starting the engine may be necessary to move the Joystick control through the entire range of motion.Expected Result:The duty cycle value of the Joystick control responds in the manner that is described at the beginning of this procedure.Results:
OK - The duty cycle value of the Joystick control responds correctly. The Pressure Sensor at the Rod