What is Kobelco SK200-6 Fault Code E-2?

Kobelco SK200-6 Fault Code E-2 indicates a malfunction in the engine preheating system, specifically related to the intake air heater circuit or glow plug relay failure. This code is triggered when the Electronic Control Module (ECM) detects abnormal voltage or resistance in the preheating circuit that warms the combustion chambers during cold starts.

This fault is particularly critical for the SK200-6's diesel engine performance because inadequate preheating causes hard starting in cold weather, excessive white smoke during startup, and increased engine wear due to incomplete combustion. In used excavators, this system often degrades due to age-related electrical corrosion and component fatigue, making early diagnosis essential to prevent starting failures in the field.

Common Symptoms

When Code E-2 is active on your Kobelco SK200-6, operators typically experience:

• Difficult or prolonged cranking during cold starts, especially in temperatures below 40°F (4°C)
• Excessive white or gray smoke immediately after engine startup that persists longer than normal
• Preheating indicator light either failing to illuminate, staying on continuously, or flashing intermittently on the instrument panel
• Check engine warning light illuminated on the dashboard with reduced engine responsiveness during warm-up
• Rough idling for the first 2-5 minutes after cold start with potential misfiring

Potential Causes

The most common technical causes for Code E-2 on used SK200-6 excavators include:

• Intake air heater element failure due to carbon buildup or internal coil breakage (common after 5,000+ operating hours)
• Glow plug relay malfunction or stuck contacts preventing proper voltage delivery to the preheating system
• Damaged wiring harness near the engine firewall where vibration causes wire chafing against metal brackets
• Corroded electrical connectors at the intake heater assembly, particularly where moisture accumulates near the air intake manifold
• Faulty ECM preheating circuit or internal relay driver failure within the control module itself
• Low battery voltage (below 11.5V) preventing adequate current flow to energize the heating elements

How to Troubleshoot and Fix Code E-2

Step 1: Visual Inspection Begin by inspecting the intake air heater assembly located on the intake manifold. Check all electrical connectors for corrosion, moisture intrusion, or loose connections. On used excavators, examine the wiring harness routing from the ECM to the heater for signs of abrasion, especially where it contacts the engine block or frame rails.

Step 2: Electrical Testing Using a digital multimeter, test the glow plug relay operation. With the ignition in the "preheat" position, verify the relay receives battery voltage (approximately 12-14V) on the control side. Check for continuity through the relay when activated. Measure resistance across the intake air heater element—normal readings should be 0.5-2.0 ohms; infinite resistance indicates element failure.

Step 3: Circuit Voltage Check Test voltage at the intake heater during the preheat cycle. You should measure full battery voltage when the preheating system is active. If voltage is present but the heater doesn't warm up, replace the heating element assembly. If no voltage reaches the heater, trace back through the relay and wiring harness to locate the open circuit.

Step 4: Component Replacement For used machines, prioritize replacing corroded connectors and damaged harness sections before condemning major components. Clean all ground connections thoroughly. If the intake heater element tests faulty, replacement requires draining coolant and removing intake piping—budget 2-3 hours for this repair.

Step 5: Clear Code and Verify After repairs, use Kobelco diagnostic software or a compatible scanner to clear the fault code. Perform a cold start test to verify proper preheating function and confirm the code doesn't return.

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Disclaimer: This guide provides general troubleshooting information for Kobelco SK200-6 excavators. Always consult the manufacturer's service manual for your specific machine serial number and year. If you're unfamiliar with electrical diagnostics or high-voltage systems, seek assistance from a certified heavy equipment technician to prevent injury or further equipment damage.