Komatsu PC210-8M0 Fault Code DWK2KB: Technical Guide

What is Komatsu PC210-8M0 Fault Code DWK2KB?

Fault Code DWK2KB indicates a communication error between the engine controller (ECM) and the hydraulic pump control system, specifically related to the pump flow control solenoid valve circuit malfunction. This code is triggered when the ECM detects an abnormal voltage signal or open/short circuit condition in the proportional solenoid that regulates hydraulic pump displacement.

This is critical for the PC210-8M0 because the electronically-controlled hydraulic system relies on precise communication between the engine and pump controllers to optimize fuel efficiency and hydraulic performance. When this circuit fails, the machine cannot properly modulate pump output based on load demands, leading to reduced productivity and potential component damage.

Common Symptoms

When DWK2KB is active, operators typically experience:

• Warning lamp illumination on the monitor panel with reduced engine power output
• Sluggish hydraulic response across all functions (boom, arm, bucket, swing)
• Excessive engine RPM without corresponding hydraulic power increase
• Intermittent loss of fine control during precision work, with the machine reverting to fixed displacement mode
• Increased fuel consumption due to the pump running at maximum displacement regardless of load

Potential Causes

The most common technical failures triggering DWK2KB on used PC210-8M0 excavators include:

• Solenoid coil failure in the pump flow control valve due to heat exposure and age-related insulation breakdown
• Harness chafing at the routing point near the hydraulic pump mounting bracket—a known wear location on this model
• Connector corrosion at the 6-pin Deutsch connector (C401) exposed to hydraulic fluid mist and moisture
• ECM internal driver circuit failure affecting the PWM output for solenoid control
• Damaged wiring between the main harness and pump controller due to improper previous repairs

How to Troubleshoot and Fix Code DWK2KB

Step 1: Visual Inspection
Begin by inspecting the wiring harness routing from the ECM to the hydraulic pump. On used excavators, check specifically where the harness passes the pump mounting bracket for abrasion damage. Inspect connector C401 for bent pins, corrosion, or hydraulic oil contamination.

Step 2: Electrical Testing
Using a digital multimeter, measure solenoid coil resistance at the pump-side connector (should read 8-12 ohms at 20°C). Check for supply voltage (typically 12V) at the connector with the key on. Test for shorts to ground on both solenoid wires with harness disconnected.

Step 3: Advanced Diagnostics
Connect Komatsu KOMTRAX diagnostic software to monitor real-time PWM signal output from the ECM. Compare commanded versus actual current flow (normal range: 200-800mA). Perform a solenoid actuation test through the software to isolate ECM versus solenoid failure.

Step 4: Component Replacement
If the solenoid tests faulty, replace the complete flow control valve assembly (part number 723-46-13102). For harness damage, repair using OEM-spec 18-gauge wire with proper heat-shrink connections and secure routing away from heat/friction points.

---

Disclaimer: This guide provides general technical information. Always consult the official Komatsu service manual and consider professional diagnostic services for complex electrical issues. Improper repairs may void warranties or cause additional damage.