What is Volvo Excavator Fault Code 146PID1713?

Volvo Fault Code 146PID1713 indicates an abnormal electrical condition in the Fuel Temperature Sensor circuit (PID 1713), specifically detecting a voltage signal that is higher than the expected range (Condition Code 146 typically signifies "data erratic, intermittent, or incorrect"). This fault is logged by the Engine Control Module (ECM) when the fuel temperature sensor sends a signal that exceeds calibrated voltage thresholds or fluctuates irregularly during engine operation.

The Fuel Temperature Sensor monitors diesel fuel temperature entering the injection system, allowing the ECM to adjust injection timing and fuel delivery for optimal combustion efficiency. In Volvo excavators, this sensor is critical for cold-start performance, emissions control, and protecting the high-pressure fuel system from temperature-related damage. An erratic signal can cause the ECM to default to substitute values, reducing engine performance and potentially triggering derate modes.

Common Symptoms

• Check Engine Light or Malfunction Indicator Lamp (MIL) illuminated on the instrument cluster
• Hard starting or extended cranking times, especially in cold conditions
• Rough idling or inconsistent engine RPM during warm-up cycles
• Reduced engine power or activation of torque derate mode to protect the fuel system
• Erratic fuel consumption readings or black smoke from the exhaust due to incorrect fuel/air mixture calculations

Potential Causes

The most common technical causes for Code 146PID1713 in used Volvo excavators include:

• Faulty Fuel Temperature Sensor – Internal resistance drift or thermistor failure in aging sensors
• Damaged wiring harness – Particularly at harness routing points near the fuel filter housing or engine block where vibration and heat cause insulation breakdown
• Corroded or loose connector pins – Moisture intrusion at the sensor connector, common in machines with high hours or poor maintenance history
• Intermittent short to voltage – Chafed wiring contacting positive voltage sources along the engine harness
• ECM calibration issues – Rare, but outdated software versions may misinterpret sensor signals

How to Troubleshoot and Fix Code 146PID1713

Step 1: Visual Inspection Begin by locating the Fuel Temperature Sensor (typically integrated into the fuel filter housing or fuel rail). Inspect the sensor connector for corrosion, bent pins, or moisture. Check the entire wiring harness from sensor to ECM for abrasion, especially where it contacts metal surfaces or passes near hot exhaust components. On used excavators, harness wear at mounting clips is extremely common.

Step 2: Electrical Testing Disconnect the sensor connector and use a digital multimeter (DMM) to measure sensor resistance. Compare readings against Volvo specifications (typically 2,000-3,000 ohms at 20°C, decreasing as temperature rises). Check for voltage supply from the ECM at the connector – should be approximately 5 volts DC. Measure resistance to ground on the signal wire with the harness disconnected; infinite resistance indicates proper insulation.

Step 3: Signal Monitoring Using Volvo VCADS (Volvo Computer Aided Diagnostic System) or compatible diagnostic software, monitor live fuel temperature data while the engine warms up. Erratic jumps or out-of-range values (below -40°C or above 150°C) confirm sensor or circuit failure. Clear codes and perform a stationary regeneration test to verify repair.

Step 4: Component Replacement If testing confirms sensor failure, replace with genuine Volvo parts to ensure proper calibration. After installation, apply dielectric grease to connector pins to prevent future corrosion—critical for used machines operating in harsh environments.

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Disclaimer: This guide provides general troubleshooting information. Always consult the official Volvo service manual for your specific model and serial number. If unfamiliar with high-pressure fuel systems or electrical diagnostics, seek assistance from a certified Volvo technician to avoid injury or further damage.