All the sensors of the excavator are in use, there will be wear, and there will be some failures. However, most of the faults are small ones, and some error code prompts will appear at the same time. If we don’t understand the error codes of these sensors, it is just a small problem, which will take a lot of time. So it is important for us to know some error codes of Hitachi excavator sensors. Let’s introduce in detail:

1, ECM sensor system fault code fault reason

636-2 Camshaft angle sensor is abnormal (no signal). Although the crank signal appears, the cam signal does not appear.

636-2 Camshaft angle sensor abnormal (signal abnormal) cam signal pulse mismatch.

723-2 Crank speed sensor is abnormal (no signal). Although crank signal appears, cam signal does not appear.

723-2 Crank speed sensor abnormal (signal abnormal) cam signal pulse mismatch.

636-7 The right cam pulse does not exist at the position where the camshaft angle sensor phase does not match the crank clearance.

172-3 Intake air temperature sensor abnormal (high pressure abnormal) the intake air temperature sensor voltage is higher than 4.95 V within 3 minutes after engine starting

172-4 Intake air temperature sensor abnormal (low pressure abnormal) intake air temperature sensor voltage below 0.1 V

110-3 Coolant temperature sensor abnormal (high pressure abnormal) coolant temperature sensor voltage above 4.85 V

110-4 Coolant temperature sensor abnormal (low pressure abnormal) coolant temperature sensor voltage below 0.1 V

102-4 Boost air pressure sensor abnormal (high pressure abnormal) boost air pressure sensor voltage higher than 4.9 V

102-3 Boost air pressure sensor abnormal (low pressure abnormal) boost air pressure sensor voltage below 0.1 V

10001-3 EGR position abnormal (no brush specification) EGR position output signal condition cannot appear

108-4 Atmospheric pressure sensor abnormal (high pressure abnormal) atmospheric pressure sensor voltage above 3.8 V

108-3 Atmospheric pressure sensor abnormal (low pressure abnormal) atmospheric pressure sensor voltage below 0.5V

174-3 Abnormal fuel temperature sensor (abnormal high pressure) the fuel temperature sensor voltage is higher than 4.85 V within 3 minutes after engine starting

174-4 Fuel temperature sensor abnormal (low pressure abnormal) fuel temperature sensor voltage below 0.1 V

157-3 Common rail pressure sensor abnormal (high pressure abnormal) common rail pressure sensor voltage higher than 4.5V

157-3 Common rail pressure sensor abnormal (low pressure abnormal) common rail pressure sensor voltage is lower than 0.7 V

100-4 Abnormal oil pressure sensor (abnormal high pressure) oil pressure sensor voltage is higher than 4.85 V

100-3 Oil pressure sensor abnormal (low pressure abnormal) oil pressure sensor voltage below 0.1 V

105-3 Abnormal charge air temperature sensor (abnormal high pressure) the charge air temperature sensor voltage is higher than 4.95v for more than 5 minutes after engine start or when the coolant temperature is higher than 50 ° C (122 ° f)

105-4 Charge air temperature sensor abnormal (low pressure abnormal) charge air temperature sensor voltage below 0.1 V

636-2 Camshaft angle sensor abnormal (no signal) zero

636-2 Camshaft angle sensor abnormal (abnormal signal) operation is not affected. No restart after shutdown

723-2 Crank speed sensor abnormal (no signal)

723-2 Crank speed sensor abnormal (signal abnormal) output power does not drop

636-7 Camshaft angle sensor phase mismatch operation is not affected. No restart after shutdown

172-3 Intake air temperature sensor abnormal (high pressure abnormal)

172-4 Intake air temperature sensor abnormal (low pressure abnormal) output power does not drop

110-3 Coolant temperature sensor abnormal (high pressure abnormal)

110-4 Coolant temperature sensor abnormal (low pressure abnormal) output power does not drop

102-3 Boost air inlet pressure sensor abnormal (low pressure abnormal) output power does not drop

10001-3 EGR position is abnormal (no brush specification) output power does not drop

108-4 Abnormal atmospheric pressure sensor (abnormal high pressure)

108-3 Abnormal atmospheric pressure sensor (abnormal low pressure) output power does not decrease

174-3 Fuel temperature sensor abnormal (high pressure abnormal)

174-4 Abnormal fuel temperature sensor (abnormal low pressure) output power does not decrease

157-3 Common rail pressure sensor abnormal (high pressure abnormal) ○

157-4 Common rail pressure sensor abnormal (low pressure abnormal) output power drop: 70%

100-4 Abnormal oil pressure sensor (abnormal high pressure)

100-3 Abnormal oil pressure sensor (abnormal low pressure)

105-3 Abnormal charge air inlet temperature sensor (abnormal high pressure)

105-4 Abnormal charge air inlet temperature sensor (abnormal low pressure)

11101-3Abnormal high pressure of engine speed control knob sensor

11101-4 Abnormal low pressure of engine speed control knob sensor

11200-3 Abnormal high pressure of pump 1 delivery pressure sensor

11200-4 Pump 1 delivery pressure sensor low pressure abnormal

11202-3 Abnormal high pressure of pump 2 delivery pressure sensor

11202-4 Pump 2 delivery pressure sensor low pressure abnormal

11206-3 Pump 1 pump control pressure sensor high pressure abnormal

11206-4 Pump 1 pump control pressure sensor low high pressure abnormal

11208-3 Pump 2 pump control pressure sensor high pressure abnormal

11208-4 Pump 2 pump control pressure sensor low high pressure abnormal

11301-3 Swing pilot pressure sensor high pressure abnormal

11301-4 Swing pilot pressure sensor low pressure abnormal

11302-3 Boom lift pilot pressure sensor high pressure abnormal

11302-4 Boom lift pilot pressure sensor low pressure abnormal

11303-3 Stick in pilot pressure sensor high pressure abnormal

11303-4 Stick in pilot pressure sensor low pressure abnormal

11304-3 Travel pilot pressure sensor high pressure abnormal

11304-4 Travel pilot pressure sensor low pressure abnormal

11307-3 Front end work unit pilot pressure sensor high pressure abnormal

11307-4 Front end work unit pilot pressure sensor low pressure abnormal

Fault code: 11301-3

Problem: swing pilot pressure sensor high pressure abnormal

Fault cause: voltage 4.75V or above

Affected control: (1) stick regeneration control (2) accessory flow control (3) swing alarm control

The working symptoms of the machine when the fault occurs: (1) the speed of the combined stick retraction and swing operation stick is slow (2) if the machine is equipped with a swing alarm and the swing alarm is working, the swing alarm will sound continuously.

Remarks: (1) check the harness (2) replace the swing pilot pressure sensor

Fault code: 11301-4

Problem: swing pilot pressure sensor low pressure abnormal

Fault cause: voltage less than 0.25V

Affected control: (1) stick regeneration control (2) accessory flow control (3) swing alarm control

The working symptoms of the machine when the fault occurs: (1) the speed of the combined stick retraction and swing operation stick is slow (2) if the machine is equipped with a swing alarm and the swing alarm is working, the swing alarm will sound continuously.

Remarks: (1) check the harness (2) replace the swing pilot pressure sensor

Fault code: 11301-3

Fault problem: boom lift pilot pressure sensor high pressure abnormal fault cause: voltage 4.75V or above

Affected control: (1) HP mode control (2) stick regeneration control (3) excavator regeneration control (4) automatic power lift control (5) accessory flow control

Operating symptoms of the machine when the fault occurs: (1) boom lifting speed does not increase when HP is under control; (2) stick retraction and boom lifting combined operation stick speed is slow

Remarks: (1) check harness (2) replace boom lift pilot pressure sensor

Fault code: 11301-4

Problem: boom lift pilot pressure sensor low pressure abnormal

Cause of fault: voltage below 0.25V

Affected controls: (1) HP mode control (2 stick regeneration control (3) excavator regeneration control (4) automatic power lift control (5) accessory flow control

Operating symptoms of the machine when the fault occurs: (1) boom lifting speed does not increase when HP is under control; (2) stick retraction and boom lifting combined operation stick speed is slow

Remarks: (1) check harness (2) replace boom lift pilot pressure sensor

The above mainly introduces the error codes related to Hitachi sensors. If you want to know which Hitachi products you need to troubleshoot your fault code, Please contact us!