SPACER 2040500 - Caterpillar

Illustration 1 g02598216
Schematic of "Stick Angle" SensorThis diagnostic code is associated with the "Stick Angle" Sensor. The FMI 03 diagnostic code indicates that the Machine ECM is detecting a voltage at the sensor that is above normal. Conditions that can cause this diagnostic code to be active are listed below:
There is a problem with the power supply for the sensor.
The signal circuit for the sensor has an open or a bad connection.
The signal circuit for the sensor is shorted to a voltage source.
The sensor has failed.
The ECM has failed. A failure of the Machine ECM 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, secure, and 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. 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. Test Step 1. CHECK THE POWER SUPPLY OF THE SENSOR
Turn the key start switch and the disconnect switch to the ON position.
Disconnect the machine harness connector from the sensor.
At the machine harness connector for the sensor, measure the supply voltage between the contact of the power supply A (wire 159-bu) and the ground contact B (wire 235-BK).Expected Result:The measurement of the supply voltage is 24.0 0.5 VDC.Results:
OK - The voltage measurement is 24.0 0.5 VDC. The power supply for the sensor is correct. Proceed to Test Step 2.
NOT OK - The voltage measurement is less than 24.0 0.5 VDC. The power supply for the sensor is not correct. Repair: Either the return circuit 235-BK or the supply circuit 159-BU has a bad connection or an open in the machine harness. Examine all of the connectors that are in the circuit. Ensure that the connections are clean, that the connections are secure and that the connections are in good condition. Troubleshoot the power supply. After the power supply is correct, verify that this diagnostic code is still active before proceeding with this procedure.STOPTest Step 2. CHECK FOR AN OPEN IN THE SENSOR CIRCUITThe machine harness connector remains disconnected from the sensor.
Turn the key start switch and the disconnect switch to the OFF position.
At the machine harness connector for the sensor, place a jumper wire between the return contact of the sensor B (wire 235-BK) and the signal contact C (wire J851-BR) .
Disconnect machine harness connectors J1 and J2 from the ECM.
At the harness connectors for the ECM, measure the resistance from return contact J1-14 (wire 235-BK) to signal contact J1-47 (wire J851-BR).Expected Result:The resistance measurement is less