HOSE AS 4997283 - Caterpillar

Illustration 1 g02204273
Schematic of the blade control handle circuitThe CID 1870 diagnostic code is associated with blade control thumb rocker position sensor. The signal receives power from the battery. The position sensor sends a PWM input signal to the Implement ECM. The duty cycle of the signal varies from approximately 90 percent at the full left position to approximately 10 percent at the full right position. When the thumb rocker is at the center position, the duty cycle will be approximately 50 percent. The position sensor is a PWM sensor that operates at a frequency of approximately 500 80 Hz.The FMI 03 diagnostic code means the input signal from the sensor and the signal voltage is above the acceptable range.Possible causes of the diagnostic code are listed below:
The power supply circuit is open.
The fuse has blown.
The return circuit is open.
The signal circuit is open.
The signal circuit is shorted to another voltage source.
The sensor has failed.
The ECM has failed. An ECM failure is unlikely. System Response:
A level 2 warning will be generated.
All functions of the blade that involve pitch are disabled.
The "Limp Home" option is still available.Note: Ensure that the CID 1870 FMI 03 diagnostic code is active. This procedure can cause new diagnostic codes to be recorded. Ignore these created diagnostic codes. When the procedure is completed, clear the created diagnostic codes.Test Step 1. Check the power supply circuit to the sensor
Turn the disconnect switch and the key start switch to the ON position. Do not start the engine.
At the machine harness connector for the sensor, insert a multimeter probe along contact "1" wire (176-OR) and along contact "2" wire (210-BK). Do not disconnect the machine harness connector from the sensor.
Measure the voltage.Expected Result:The voltage measurement is between 23.5 VDC and 24.5 VDC.Results:
OK - The voltage measurement is between 23.5 VDC and 24.5 VDC. The power circuits for the sensor are correct. Proceed to Test Step 2.
NOT OK - The voltage measurement is less than 23.5 VDC. The power supply for the sensor is not correct.Repair: There is an open circuit or a bad connection in the machine harness. Verify that the fuse is in good condition and is not blown. Wire (176-OR) may have an open circuit. Refer to Electrical System Schematic, KENR8916. Examine all of the connectors that are in the circuit. Ensure that the connections are clean and secure. Repair the machine harness or replace the machine harness.STOPTest Step 2. CHECK FOR AN OPEN IN THE SENSOR CIRCUIT
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the connector from the sensor. At the harness connector for the sensor, place a jumper wire between contact "2" wire (210-BK) and the contact "3" wire (K757-YL).
Disconnect the J1 and J2 machine harness connectors from the ECM.
At the machine harness connectors for the ECM, measure the resistance between contact J1-13 wire (210-BK) and contact J2-26 wire (K757-YL).Expected Result:The resistance measurement is less than 5 ohms.Results:
OK - The resistance measurement is less than 5 ohms. The