MANIFOLD & MTG GP-CONTROL 2185812 - Caterpillar

Illustration 1 g01343143
Connections of the shift lever position sensor
This diagnostic code is associated with the shift lever position sensor. 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 value of the sensor duty cycle is approximately 50% in the neutral position. The duty cycle of the signal increases as the lever is moved from the neutral position to the forward position. The value of the sensor duty cycle is approximately 80% 10% in the forward position. The duty cycle of the signal decreases as the lever is moved from the neutral position to the reverse position. The value of the sensor duty cycle is approximately 20% 10% in the reverse position.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. ECM failure 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 0299 FMI 08 is active before performing this procedure.Note: Use the digital multimeter for the measurements in this procedure.System Response:The transmission will be placed in NEUTRAL until the diagnostic code is cleared.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 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 10 DCV.Results:
OK - The voltage is 10 DCV. Proceed to Test Step 3.
NOT OK - The voltage is not 10 DCV. 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 sensor harness connector, remove the 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 multimeter probe along the ground wire (contact 2).
Turn the disconnect switch and the key start switch to the ON position.
Monitor the signal of the sensor with the digital multimeter.
Without disconnecting the sensor or the hardware associated with the sensor, take the sensor through the full operating range.Note: On some machines, starting the engine may be necessary to take the sensor through the full operating range of the sensor.Expected Result:The sensor signal responds in the manner that is described at the beginning of this procedure.Results:
OK - The sensor signal responds correctly. The sensor is operating correctly. Proceed to Test Step 3.
NOT OK - The sensor signal does not respond correctly. The sensor is NOT operating correctly.Repair: Replace the sensor.STOPTest