What is Hitachi ZX200-5G-HCMC Fault Code 13304-2?

Fault Code 13304-2 on the Hitachi ZX200-5G-HCMC indicates a malfunction in the Engine Control Module (ECM) communication circuit, specifically a CAN (Controller Area Network) bus communication error with the pump control system. This code triggers when the ECM detects incomplete or interrupted data transmission between the engine controller and the hydraulic pump controller, preventing proper coordination of engine speed and hydraulic demand.

This communication failure is critical for the ZX200-5G's performance because the machine relies on real-time data exchange between controllers to optimize fuel efficiency and hydraulic response. When the CAN bus integrity is compromised, the excavator cannot properly match engine output to hydraulic load, resulting in reduced productivity and potential component stress.

Common Symptoms

• Warning light illuminated on the instrument cluster with reduced engine power output
• Erratic or sluggish hydraulic response, particularly during simultaneous multi-function operations
• Engine RPM fluctuations or failure to automatically adjust to hydraulic load demands
• Intermittent loss of monitor display information showing system parameters
• Machine may enter derate mode, limiting maximum engine speed to 1,500-1,800 RPM

Potential Causes

The most common causes of Code 13304-2 on used ZX200-5G excavators include:

• CAN bus wiring harness damage from abrasion against the engine block or frame rails, especially near the fuel filter area where harness routing is tight
• Corroded or moisture-contaminated connectors at the pump controller (located under the operator platform) due to seal deterioration
• Failed termination resistors in the CAN network, typically a 120-ohm resistor at either end of the bus
• ECM or pump controller internal failure, though less common than wiring issues
• Voltage irregularities from aging battery cables or poor grounding connections at the chassis ground points

How to Troubleshoot and Fix Code 13304-2

Step 1: Visual Inspection Perform a thorough physical inspection of the CAN bus harness running from the ECM (right side of engine) to the pump controller. On used excavators, check for harness wear at known rub points near the engine mount brackets and hydraulic tank. Inspect all connector pins for corrosion, bent terminals, or moisture intrusion.

Step 2: Electrical Testing Using a digital multimeter, verify CAN-High and CAN-Low circuit continuity. Measure resistance between CAN-High and CAN-Low terminals—you should read approximately 60 ohms with the ignition off (indicating proper termination resistors). Check for short circuits to ground on both lines; readings should show infinite resistance.

Step 3: Connector Service and Verification Disconnect and clean all CAN bus connectors with electrical contact cleaner. Apply dielectric grease to prevent future corrosion—critical for used machines operating in humid environments. Clear the fault code using Hitachi Dr.EX diagnostic software and perform a system function test to verify communication is restored.

Step 4: Component Replacement If wiring and connections test properly, suspect controller failure. Replace the pump controller first (more common failure point), then ECM if necessary.

Disclaimer: This guide provides general troubleshooting information. For complex electrical issues or component replacement, consult a certified Hitachi technician or authorized service center with proper diagnostic equipment.