HUB 1155317 - Caterpillar

diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 1956 FMI 03 is active before performing this procedure.Note: Use the 146-4080 Digital Multimeter for the measurements in this procedure.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, that all connections are secure and that all connections are 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.Test Step 1. CHECK THE ENERGIZE CIRCUIT OF THE SENSOR
Turn the key start switch and the disconnect switch to the ON position.
At the J1 harness connector for the position sensor for the bucket, insert 7X-1710 Multimeter Probes along the contact for the power supply J1-27 (wire E472-GN) and along the contact for the ground J1-18 (wire A209-BK). Do not disconnect the machine harness from the J1 connector.
Measure the DC voltage of the sensor power supply.Expected Result:The voltage measurement is approximately 8.0 0.4 VDC.Results:
OK - The voltage measurement is approximately 8.0 0.4 VDC. The power supply for the sensor is correct. Proceed to Test Step 2.
NOT OK - The voltage measurement is less than 8.0 0.4 VDC. The power supply for the sensor is not correct. Repair: If the voltage measurement is not correct, the problem is most likely in the wire of the power circuit. This condition will cause multiple diagnostic codes to activate.Refer to the complete Electrical System Schematic of the machine. Examine all of the connectors that are in the circuits. Ensure that the connections are clean, that all connections are secure and that all connections are in good condition.For troubleshooting the ECM power supply that provides power to the sensor: refer to the CID 0041 diagnostic code procedure in the troubleshooting section of the manual for the Machine ECM.Repair the faulty power supply circuit before proceeding with this procedure.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 machine harness connector from the position sensor for the bucket. At the harness connectors for the sensor, place a jumper wire between the ground 2 contact (wire A209-BK) and the signal contact (wire J949-GY).
Disconnect machine harness connectors J1 and J2 from the Machine ECM.
At the harness connector for the Machine ECM, measure the resistance from return contact J1-18 (wire A209-BK) to signal contact J1-17 (wire J949-GY).
Observe the resistance measurement and wiggle the ECM connector and the sensor connector. Gently pull on the wires. Move the wires in a circular motion for both connectors.Expected Result:The resistance measurement is less than 5 ohms at all times during the manipulation of the wiring harness and connectors.Results:
OK - The resistance measurement is less than 5 ohms. The signal circuit of the sensor and the ground