Komatsu PC100-6 Fault Code E216: Complete Diagnostic Guide

What is Komatsu PC100-6 Fault Code E216?

Fault Code E216 indicates a malfunction in the hydraulic pump solenoid proportional control circuit, specifically detecting an abnormal voltage or current flow in the main pump's electronic control system. This code triggers when the Engine Control Module (ECM) detects that the hydraulic pump solenoid valve is not responding correctly to commanded signals, affecting the machine's ability to regulate hydraulic flow and pressure.

For the PC100-6 model, this is critical because the proportional solenoid directly controls the swash plate angle of the variable displacement pump. When this circuit malfunctions, the excavator cannot efficiently match hydraulic output to operator demand, leading to reduced productivity and potential component damage from improper pressure regulation.

Common Symptoms

• Sluggish hydraulic response across all functions (boom, arm, bucket, swing)
• Erratic engine rpm fluctuations during hydraulic operations, particularly under load
• Warning light activation on the instrument panel, often accompanied by audible alarms
• Automatic power derate mode where engine limits output to protect the hydraulic system
• Inconsistent digging force or inability to maintain steady pressure during grading operations

Potential Causes

The E216 code typically stems from electrical issues rather than mechanical pump failure:

• Corroded or loose connector pins at the pump solenoid harness (common on used machines operating in wet/dusty conditions)
• Harness chafing or wire breakage where the cable routes near the pump mounting bracket—a known wear point on PC100-6 models
• Failed proportional solenoid coil within the pump assembly, showing incorrect resistance readings
• ECM internal circuit problems affecting the solenoid driver output
• Voltage supply issues from damaged wiring between the main relay and pump solenoid

How to Troubleshoot and Fix Code E216

Step 1: Visual Inspection Begin by disconnecting the battery and inspecting the hydraulic pump solenoid connector for corrosion, bent pins, or moisture intrusion. On used excavators, check the entire harness routing from the ECM to the pump for signs of rubbing against the frame or heat damage from nearby exhaust components.

Step 2: Resistance Testing Using a multimeter, measure the solenoid coil resistance at the pump connector (harness disconnected). Specifications typically range between 8-12 ohms for PC100-6 models. Values outside this range indicate coil failure requiring pump solenoid replacement.

Step 3: Voltage Supply Check With the key in the ON position (engine off), measure voltage at the solenoid connector using Komatsu diagnostic software or a multimeter. You should see approximately 12V supply voltage. No voltage indicates wiring issues or ECM problems.

Step 4: Signal Testing Connect diagnostic software and command the solenoid through active tests. Monitor the PWM (Pulse Width Modulation) signal from the ECM. Erratic signals suggest ECM replacement; no signal confirms controller failure.

For used excavators: Replace connector terminals even if they appear functional—internal corrosion often causes intermittent faults. Apply dielectric grease to prevent future moisture issues.

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Disclaimer: This guide provides general diagnostic procedures. Always consult a certified Komatsu technician and the official service manual for your specific machine serial number before performing repairs. Improper diagnostics can cause additional system damage.