What is XCMG General Fault Code E1170(1)?

Fault Code E1170(1) indicates a communication error or malfunction in the main controller's CAN bus network, specifically related to the first CAN communication line failing to receive or transmit data properly. This code is triggered when the Electronic Control Module (ECM) detects that critical system components are not communicating through the Controller Area Network (CAN bus), which serves as the central nervous system for modern XCMG excavators.

The CAN bus coordinates communication between the engine controller, hydraulic system, instrument cluster, and various sensors throughout the machine. When this network fails, the excavator's ability to integrate multiple systems becomes severely compromised. For used XCMG excavators, this fault is particularly critical because it can cause the machine to enter limp mode or prevent startup entirely, directly impacting jobsite productivity and operational safety.

Common Symptoms

When fault code E1170(1) is active, operators typically experience:

• Dashboard warning lights illuminating, particularly the main system malfunction indicator or check engine light
• Complete loss of instrument cluster data, including no readings for engine temperature, hydraulic pressure, or fuel level
• Intermittent or total loss of hydraulic functions as controllers cannot communicate work mode commands
• Engine derate or failure to start, with the ECM entering protective mode due to communication loss
• Error messages on the monitor display specifically referencing communication or network failures

Potential Causes

The most common technical reasons for E1170(1) in used XCMG excavators include:

• Damaged or corroded CAN bus wiring harness, especially at connection points near the engine bay or undercarriage where vibration and moisture exposure are highest
• Faulty CAN bus termination resistors (typically 120-ohm resistors at network endpoints) causing signal reflection and data corruption
• Loose or corroded connectors at the main ECM, particularly the multi-pin CAN communication plugs
• Failed relay or power supply to the CAN network, interrupting voltage to communication modules
• ECM internal failure or corrupted software, more common in older machines with extended operating hours
• Physical damage to wiring from previous repairs, rodent damage, or harness chafing against frame members

How to Troubleshoot and Fix Code E1170(1)

Step 1: Visual Inspection of Harness and Connectors Begin by thoroughly inspecting the main wiring harness running from the ECM to all major controllers. For used excavators, pay special attention to areas where the harness passes through bulkheads or near moving components. Check for frayed wires, burnt insulation, or green corrosion on connector pins. Clean all CAN bus connectors with electrical contact cleaner and ensure tight connections.

Step 2: Test CAN Bus Continuity and Resistance Using a digital multimeter, measure resistance between the CAN-High and CAN-Low terminals at the ECM connector (typically pins specified in the XCMG service manual). You should read approximately 60 ohms with the system powered off, indicating proper termination resistor function. Check continuity along the entire CAN bus network to identify breaks or high-resistance connections exceeding 5 ohms.

Step 3: Verify Power Supply and Ground Circuits Confirm that the CAN bus power supply is delivering stable voltage (typically 12-24V depending on system design) using your multimeter. Check ground connections at the ECM and controller modules, as corroded grounds are extremely common in used machines. Clean ground contact points to bare metal and apply dielectric grease.

Step 4: Diagnostic Software Scan Connect XCMG-specific diagnostic software or a compatible CAN bus scanner to read detailed fault data and monitor real-time communication status. This will identify which specific module is failing to communicate and whether the issue is transmit or receive-related. Clear codes after repairs and perform a communication test.

Step 5: Component Replacement (If Necessary) If diagnostics point to a specific failed component, replace the faulty controller, ECM, or damaged harness sections. For used excavators, always inspect replacement harnesses for adequate strain relief and routing to prevent recurring failures.

---

Disclaimer: This guide provides general diagnostic procedures for informational purposes. Always consult the official XCMG service manual for your specific model and consider engaging a certified heavy equipment technician for complex electrical diagnostics and repairs. Improper troubleshooting can cause additional system damage.