ALTERNATOR GP-CHARGING 1604921 - Caterpillar

Illustration 1 g02567618
Schematic of the position sensor (Ejector control) This diagnostic code is associated with the Position Sensor (Ejector Control). The FMI 08 means that the ECM has determined that the signal frequency or the signal pulse width is not within the expected range. The output frequency of the position sensor is approximately 500 Hz. The duty cycle of the signal changes as the position sensor moves. Ejector Forward - 5 percent to 35 percent duty cycleEjector Neutral - 40 percent to 60 percent duty cycleEjector Reverse - 65 percent to 95 percent duty cycle The possible causes of this diagnostic code are listed below:
The sensor has failed.
Intermittent connections or poor connections
Mechanical devices are loose.
The ECM has failed. The failure of ECM 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 1283 FMI 08 is active before performing this procedure.Note: Use the 146-4080 Digital Multimeter for the measurements in this procedure. System Response:When this diagnostic code occurs, a warning (Category 1) is shown on the monitor. The diagnostic code will cause the solenoids for the ejector control to be set to the minimum command. Control of the ejector will not return until the diagnostic code is inactive. The signal from the position sensor must be in the neutral position for at least 2 seconds.Test Step 1. 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 (contact 1).
Turn the key start switch and the disconnect switch to the ON position.
Measure the voltage from contact 1 to frame ground.Expected Result:The voltage is 24 VDC.Results:
OK - The voltage is 24 VDC. Proceed to Test Step 3.
NOT OK - The voltage is not 24 VDC. The circuit is open. Repair: Repair the machine harness or replace the machine harness.STOPTest Step 2. CHECK THE SIGNAL CIRCUIT OF THE SENSOR
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 contact 1 and insert the probe along the signal wire (contact 3).
At the back of the harness connector for the sensor, insert the 7X-1710 Multimeter Probe along the ground wire (contact 2).
Turn the disconnect switch and the key start switch to the ON position.
Monitor the