Volvo EC170D Fault Code 140 PID 136513: Technical Guide

What is Volvo EC170D Fault Code 140 PID 136513?

Fault Code 140 PID 136513 indicates an electrical malfunction in the hydraulic pump solenoid control circuit, specifically detecting abnormal voltage or current flow in the pump delivery control system. This code is triggered when the Engine Control Module (ECM) detects a signal outside the expected operating range for the hydraulic pump's proportional solenoid valve.

In the Volvo EC170D, this fault directly affects the machine's ability to regulate hydraulic flow and pressure to the main pump. The system relies on precise voltage signals (typically 12-24V) to modulate pump output based on operator demand. When the ECM cannot properly communicate with or control the pump solenoid, the machine may enter a protective derate mode to prevent component damage. For used excavators, this code often stems from age-related electrical degradation rather than mechanical pump failure.

Common Symptoms

• Reduced hydraulic power across all functions (boom, arm, swing, and travel movements feel sluggish)
• Warning light illuminated on the instrument cluster with possible diagnostic message displayed
• Intermittent loss of hydraulic response, particularly during cold starts or after extended operation
• Engine continues running normally but machine operates at significantly reduced efficiency
• Error code stored in ECM memory even if symptoms appear intermittent

Potential Causes

The most common technical failures triggering this fault code in used EC170D excavators include:

• Worn or damaged wiring harness between the ECM and pump solenoid (harness runs near the swing bearing where vibration and movement cause insulation wear)
• Corroded electrical connectors at the pump solenoid or ECM interface due to moisture ingress
• Failed proportional solenoid valve within the hydraulic pump assembly (internal coil resistance out of specification)
• ECM internal fault affecting the output driver circuit for pump control
• Damaged pins or terminal contacts in the Deutsch-style connectors commonly used on Volvo equipment
• Voltage supply issues from the machine's main power distribution, affecting signal quality

How to Troubleshoot and Fix Code 140 PID 136513

Step 1: Visual Inspection and Connector Check Begin by inspecting the wiring harness routing from the ECM to the hydraulic pump solenoid. On used excavators, pay special attention to areas where the harness passes near the swing post or hydraulic tank—common rub points. Disconnect the solenoid connector and examine pins for corrosion, bent terminals, or moisture. Clean contacts with electrical contact cleaner and apply dielectric grease before reconnecting.

Step 2: Electrical Testing with Multimeter Using a digital multimeter, measure the solenoid coil resistance (typically 8-15 ohms for Volvo pump solenoids—verify exact specification in service manual). Test the supply voltage at the solenoid connector with ignition on (should read battery voltage). Check for continuity in the ground circuit and signal wire back to the ECM. Document any readings outside specification ranges.

Step 3: Advanced Diagnostics Connect Volvo VCADS Pro or compatible diagnostic software to monitor live data from PID 136513. Observe the commanded current versus actual current to the solenoid during operation. A significant variance indicates either solenoid failure or ECM driver circuit problems. For used machines, perform a wiggle test on harnesses while monitoring data to identify intermittent connection faults common in older equipment.

Step 4: Component Replacement Priority Based on test results, replace components in this order: connectors/terminals (if corroded), wiring harness (if damaged), pump solenoid (if resistance out of spec), or ECM (if all other tests pass). Always clear codes and perform a calibration cycle after repairs using diagnostic software.

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Disclaimer: This guide provides general troubleshooting information. Always consult the official Volvo service manual for your specific serial number and consider professional diagnostic assistance for complex electrical issues. Improper repairs may cause additional system damage.