303.5E2 CR Mini Hydraulic Excavator Machine ECM General Information Caterpillar


General Information
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The diagnostics for the ECM are accessed through one of the following: the Operator Monitoring System or the Cat® Electronic Technician (ET) Service Tool. When troubleshooting the electronic control system of the machine, additional information is required from the Service Manual for the machine. The following list of the recommended support materials:

  • Electrical Schematic, UENR6662, "303.5E2 CR Mini Hydraulic Excavator Electrical System (Interactive)".

  • Hydraulic Schematic, UENR5188, "303.5E2 CR, 304E2 CR, 304.5E2 XTC, 305E2 CR, 305.5E2 CR Mini Excavator Hydraulic System (Interactive)".

  • Operation and Maintenance, SEBU9418, "303.5E2 CR and 305.5E2 CR Mini Hydraulic Excavators".

  • System Operation, UENR4294, "303.5E2 CR, 304E2 CR, 305E2 CR, and 305.5E2 CR Mini Hydraulic".

  • Systems Operation, UENR4711, "303.5E2, 304.5E2 XTC, 305.5E2, 305E2, 307E2, 308E2 CR, and 308E2 SR Mini Hydraulic Excavators E2-Series Mini Hex Monitor."

As a guide, an abbreviated version of the system schematic is included at the end of this manual. For an accurate representation of the electrical system , refer to Electrical System Schematic, UENR6662.

When the troubleshooting procedure instructs you to “REPAIR THE HARNESS OR REPLACE THE HARNESS”, use the Electrical System Schematic to trace the circuit. Perform continuity checks at the harness connectors to locate harness failures. At the connectors of the components, always check the ground circuit. Less than 5 Ω of resistance is required between the ground contacts of the connector and the frame ground. The power circuits of the ECM should have less than 2 Ω of resistance between the contacts of the ground connector and the frame ground. Less than 5 Ω of resistance is required for signal circuits for normal operation. Excessive ground resistance that is greater than 5 Ω can cause incorrect diagnosing of problems.

During troubleshooting, inspect all connections before replacing any components. If these connections are not clean and tight, permanent electrical problems or intermittent electrical problems can result. Check that the wires are pushed into the connectors completely. Make sure that the connections are tight before other tests are made.

Failure of an electrical component can cause the failure of other components. Also, failure of an electrical component can be caused by the failure of other components. Always attempt to correct the cause of an electrical system failure before you replace a component.

Note: Some machines may not include all troubleshooting capabilities listed in this manual.

Information System:

303.5E2 CR Mini Hydraulic Excavator Machine ECM Event Codes
Installation Procedure for the Hydraulic Hand Control Gp (Universal) {5063}
303.5E2 CR Mini Hydraulic Excavator Machine ECM Diagnostic Trouble Codes
336D 2L and 340D 2L Excavators Machine Systems Pilot Valve (Joystick) - Remove and Install
325F Excavator Machine Systems Final Drive - Assemble
325F Excavator Machine Systems Final Drive - Disassemble
538 Forest Machine Machine Systems Process for Setting Up the Work Tool
336D 2L and 340D 2L Excavators Machine Systems Hydraulic Tank - Remove and Install
725C, 725C2, 730C, 730C2 and 730C, 730C2 EJECTOR Articulated Truck Systems Gear Motor (Hydraulic Fan)
336D2/336D2 GC Excavator Engine Supplement Turbocharger - Remove and Install
Counterbalance Valves Are Now Used on Certain Hydraulic Excavator Forestry Grapples {5362, 5457, 5555, 6307}
538 Forest Machine Machine Systems Relief Valve (Crossover) - Test and Adjust
M314F and M316F Wheeled Excavators Hydraulic System Main Pump (Minimum Displacement) - Test and Adjust - Test without Flow Meter
336D 2L and 340D 2L Excavators Machine Systems Pilot Valve (Travel) - Remove and Install
336D 2L and 340D 2L Excavators Machine Systems Main Hydraulic Pump - Remove and Install
725C, 725C2, 730C, 730C2 and 730C, 730C2 EJECTOR Articulated Truck Systems Service Brake
725C, 725C2, 730C, 730C2 and 730C, 730C2 EJECTOR Articulated Truck Systems Service Brake
336D 2L and 340D 2L Excavators Machine Systems Control Manifold (Pilot Oil) - Remove and Install
DFS118, DFS121 and DFS124 Silage Defacers Lifting and Tying Down
GSH420, GSH425, GSH440, GSH520, GSH525, GSH455 and GSH555 Orange Peel Grapples Mounting Bracket - Remove and Install
415F2 Industrial Loader Machine Systems Pitch Cylinder (3-Point Hitch) - Remove and Install
415F2 Industrial Loader Machine Systems Lift Cylinder (3-Point Hitch) - Remove and Install
415F2 Industrial Loader Machine Systems Tilt Cylinder (3-Point Hitch) - Remove and Install
415F2 Industrial Loader Machine Systems 3-Point Hitch - Remove and Install