11999.03 Bucket Curl Pilot Pressure Sensor Circuit Voltage High MS12501,0000087 –19–17JAN06–1/1 TM2361 (24JUN08) 9001-10-140 450DLC Excavator Operation and Tests 062608 PN=164 Main Controller (MCF) Diagnostic Trouble Codes 4 Short Circuit Check Disconnect harness from boom down pilot pressure sensor and main controller (MCF). YES: Short circuit in harness. Check continuity between boom down pilot pressure sensor connector pin 2 and power and ground. Repair or replace harness. See Cab Is there continuity to power or ground? Harness (W1) Wiring 9001 Diagram and see 10 Machine Harness (W2) ,140 Wiring Diagram. (Group 9015-10.) NO: Main controller (MCF) malfunction. Replace controller.
See Main Controller (MCF) Remove and Install. (Group 9015-20.) – – –1/1 Main Controller (MCF) Diagnostic Trouble Codes 4 Short Circuit Check Disconnect harness from boom down pilot pressure sensor and main controller (MCF). Check continuity between boom down pilot pressure sensor connector pin 2 and power and ground. Is there continuity to power or ground? YES: Short circuit in harness. Repair or replace harness. See Cab Harness (W1) Wiring Diagram and see Machine Harness (W2) Wiring Diagram. (Group 9015-10.) NO: Main controller (MCF) malfunction. Replace controller. See Main Controller (MCF) Remove and Install.
(Group 9015-20.) – – –1/1 9001 10 ,140 5 Harness Voltage Check Disconnect boom down pilot pressure sensor from harness. Check voltage between boom down pilot pressure sensor connector pin 1 and machine ground. Is voltage between 4.5—5.5 volts? NOTE: Key Switch: On YES: Open circuit in harness between main controller (MCF) and boom down pilot pressure sensor pin 3. Repair or replace harness. See Cab Harness (W1) Wiring Diagram and see Machine Harness (W2) Wiring Diagram. (Group 9015-10.) NO: Open circuit in harness between main controller (MCF) and boom down pilot pressure sensor pin 1. Repair or replace harness. See Cab Harness (W1) Wiring Diagram and see Machine Harness (W2) Wiring Diagram.
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