What is Komatsu PC160LC-7 Fault Code DA2SKA?

Fault Code DA2SKA on the Komatsu PC160LC-7 indicates a malfunction in the Engine Control Module (ECM) communication circuit, specifically a data link error between the engine controller and the machine's main monitoring system. This code represents a breakdown in the CAN bus (Controller Area Network) communication protocol that allows the engine ECM to share critical operational data with the excavator's display panel and other electronic control units.

This communication failure is critical for the PC160LC-7 because it prevents real-time monitoring of engine parameters, disables diagnostic functions, and can trigger fail-safe protection modes. The SAA6D102E-2 engine in this model relies heavily on electronic communication for optimal fuel management, emissions control, and operator feedback. When this data link fails, the machine's advanced monitoring capabilities become compromised, potentially masking other developing issues.

Common Symptoms

• Blank or frozen monitor display showing no engine parameters (RPM, coolant temperature, fuel level)
• Multiple warning lamps illuminating simultaneously on the instrument cluster without specific system faults
• Loss of diagnostic capability – service tools cannot communicate with the engine ECM
• Intermittent gauge readings that freeze, jump erratically, or display default values
• Engine may run normally but with no feedback to operator about operating conditions

Potential Causes

The DA2SKA code in used PC160LC-7 excavators typically stems from CAN bus wiring harness damage, particularly where harnesses route near the engine block or travel through the slew ring area. Vibration and heat cycles common in aging machines cause insulation breakdown.

Corroded or loose connector terminals at the ECM (located behind the operator's seat) or at the main wiring junction near the battery box are frequent culprits. Water intrusion through damaged grommets accelerates this corrosion in used equipment.

ECM internal failure or corrupted software can occur, especially in machines with 8,000+ operating hours. Power supply fluctuations from aging batteries or failing alternators stress the ECM's communication circuits.

Aftermarket monitor replacements or previous repair attempts may have introduced incompatible components or incorrect harness modifications affecting the 120-ohm termination resistance required for proper CAN bus function.

How to Troubleshoot and Fix Code DA2SKA

Step 1: Visual Harness Inspection Physically trace the main engine harness from the ECM to the monitor display. On used PC160LC-7s, check for harness chafing against the hydraulic tank edge and where cables pass through the cab floor. Inspect all connectors for green corrosion, bent pins, or moisture. Disconnect and reconnect each CAN bus connector (typically gray or yellow color-coded) to break through oxidation.

Step 2: Electrical Continuity Testing Using a digital multimeter, verify continuity on the CAN-High and CAN-Low wires between the ECM connector (Pin 33 and Pin 25) and the monitor connector. Resistance should read 55-65 ohms with the system powered off, indicating proper termination resistors at both ends. Any reading above 70 ohms or below 50 ohms suggests wiring damage or termination failure.

Step 3: Voltage and Ground Verification With the ignition on, measure battery voltage (12V) at ECM Pin 1 and verify solid ground at Pin 52. Check CAN-High and CAN-Low signal voltage – both should fluctuate between 2.0-3.0V during communication attempts. Static readings at 0V or 5V indicate a dead circuit.

Step 4: Software and ECM Testing Connect Komatsu KOMTRAX diagnostic software or compatible scan tool directly to the ECM diagnostic port (bypass the main harness). If communication succeeds, the harness is faulty. If communication still fails, the ECM requires replacement or reprogramming. For used excavators with unknown service history, clear all stored codes and perform a CAN bus reset procedure through the diagnostic software before replacing components.

Critical for Used Equipment: Before ordering a replacement ECM ($1,200-2,400), thoroughly clean all ground points on the chassis and engine block. Aging machines develop poor grounds that mimic electronic failures.

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Disclaimer: This guide provides general troubleshooting information. Always consult the Komatsu PC160LC-7 Service Manual and consider professional diagnosis for complex electrical issues. Improper testing can damage expensive electronic components.