Kobelco Excavator Pressure Sensors Guide: Low & High-Pressure Fault Codes (B & C Series)
Overview: Pressure sensors play a vital role in the mechatronics control system of Kobelco excavators, governing pilot signal feedback, pump displacement, and engine horsepower regulation. This comprehensive guide covers low-pressure and high-pressure sensor locations, interchangeability rules, and standard troubleshooting workflows for B-series and C-series diagnostic fault codes.
1. Low-Pressure Sensors: Working Principle & Locations
When the control joystick is fully stroked, secondary pilot pressure oil is output, sensed by the low-pressure sensor, and directed to the control valve spool. The low-pressure sensor detects this pilot pressure and converts it into an electronic signal sent to the mechatronic controller (CPU). The CPU processes the data and adjusts the hydraulic pump regulator swashplate angle, changing the output flow accordingly.
Important Note: All low-pressure sensors of the same excavator model are fully interchangeable and compatible with one another.
SK75-8 Low-Pressure Sensor Distribution
Kobelco 8-Series (10-40 Ton Class) Low-Pressure Sensor Distribution
2. High-Pressure Sensors: Function & Locations
In mechatronic control systems, high-pressure sensors are utilized for pump flow control, engine horsepower matching, and confluence control. Kobelco excavators feature two primary high-pressure sensors—the P1 Side High-Pressure Sensor and P2 Side High-Pressure Sensor—located directly on the P1 and P2 hydraulic pumps.
Important Note: The two high-pressure sensors within the same machine model are interchangeable and can be swapped for testing.
3. Comprehensive Fault Code Troubleshooting Tables (B & C Series)
When B-series (low/select pressure) or C-series (pump pressure) error codes appear on your Kobelco monitor, follow the standard 3-step troubleshooting logic: 1. Connector swap test; 2. Wiring harness inspection; 3. Controller replacement verification.
Travel Low-Pressure Sensors (B102, B103, B104, B092, B093, B094)
| Fault Code | Fault Description | Standard Troubleshooting Steps |
|---|---|---|
| B102 / B092 | Right Travel Pressure Sensor Open Circuit / Abnormal Output | 1. Swap connector with another sensor, turn starter switch ON. If error clears and another code appears, replace defective sensor. 2. If error persists, inspect and repair wiring harness. 3. Replace controller and verify. |
| B103 / B093 | Left Travel Pressure Sensor Open Circuit / Abnormal Output | 1. Swap connector with another sensor. If error clears and another code appears, replace sensor. 2. If error persists, check wiring harness. 3. Replace controller and verify. |
| B104 / B094 | Left Travel Pressure Sensor Power Short Circuit | 1. Swap connector with another sensor. If error clears, replace sensor. 2. If error remains, inspect wiring short circuits. 3. Replace controller and verify. |
Boom Low-Pressure Sensors (B012 - B024)
| Fault Code | Fault Description | Standard Troubleshooting Steps |
|---|---|---|
| B012 / B013 / B014 | Boom Up Pressure Sensor (Abnormal Output / Open / Short Circuit) | 1. Swap connector with another sensor and turn starter switch ON. If error migrates, replace sensor. 2. If fault remains, inspect and repair wiring harness. 3. Replace controller and verify. |
| B022 / B023 / B024 | Boom Down Pressure Sensor (Abnormal Output / Open / Short Circuit) | 1. Swap connector with another sensor. If error migrates, replace sensor. 2. If fault remains, check wiring harness. 3. Replace controller and verify. |
Arm & Bucket Low-Pressure Sensors (B032 - B064)
| Fault Code | Fault Description | Standard Troubleshooting Steps |
|---|---|---|
| B032 - B044 | Arm Extension / Retraction Pressure Sensor Faults | 1. Perform connector swap test with another sensor. 2. Inspect wiring harness for continuity or short-to-power. 3. Test or replace controller if wiring is normal. |
| B052 - B064 | Bucket Digging / Knock Pressure Sensor Faults | 1. Perform connector swap test. 2. Check wiring harness pin connections. 3. Verify controller function. |
Swing & Select Pressure Sensors (B072-B074, B162-B174)
| Fault Code | Fault Description | Standard Troubleshooting Steps |
|---|---|---|
| B072 - B074 | Swing Pressure Sensor Faults (Abnormal Output / Open / Short) | 1. Swap connector with working sensor; test with starter switch ON. 2. Inspect wiring harness. 3. Replace controller if necessary. |
| B162 - B174 | P1 / P2 Side Select Pressure Sensor Faults | 1. Swap sensor connectors (e.g., SE-11) and test. 2. Check wiring continuity. 3. Verify controller operation. |
Hydraulic Pump High-Pressure Sensors (C012 - C024)
| Fault Code | Fault Description | Standard Troubleshooting Steps |
|---|---|---|
| C012 / C013 / C014 | P1 Pump Pressure Sensor (Abnormal Output / Open / Power Open) | 1. Swap connector with another sensor and turn starter switch ON. If error follows, replace sensor. 2. If error remains, inspect wiring harness. 3. Replace controller and verify. |
| C022 / C023 / C024 | P2 Pump Pressure Sensor (Abnormal Output / Open / Short Circuit) | 1. Swap connector with another sensor. If error follows, replace sensor. 2. If error remains, inspect wiring. 3. Replace controller and verify. Note: If the whole machine operates sluggishly simultaneously, it is caused by the CPU receiving incorrect high-pressure sensor signals. Operation returns to normal once resolved. |
