Sany Excavator Fault Code P195: Technical Guide

What is Sany Fault Code P195?

Fault Code P195 indicates a malfunction in the hydraulic pump control system, specifically related to the pump solenoid valve circuit or its associated wiring harness. This code is triggered when the ECM (Engine Control Module) detects an abnormal voltage signal, open circuit, or short circuit in the hydraulic pump's electronic control system.

In Sany excavators, the hydraulic pump solenoid regulates oil flow and pressure based on operator demand and load conditions. When this system fails, the machine cannot properly modulate hydraulic power, directly impacting digging force, swing speed, and overall operational efficiency. This code is particularly critical because it can force the excavator into a derate mode or reduce hydraulic output to prevent further damage.

Common Symptoms

When Code P195 is active, operators typically experience:

• Hydraulic power loss or noticeably reduced digging force and boom/arm speed
• Intermittent or complete loss of auxiliary hydraulic functions
• Warning light illumination on the dashboard (typically a yellow hydraulic system icon)
• Erratic hydraulic response where the machine operates normally then suddenly loses power
• Engine running normally but hydraulics responding sluggishly or inconsistently

Potential Causes

The most common technical reasons for P195 in used Sany excavators include:

• Damaged solenoid valve wiring harness due to rubbing against the pump housing or frame (common wear point near the main pump mounting area)
• Failed hydraulic pump solenoid coil caused by overheating, moisture ingress, or electrical spike damage
• Corroded or loose connector pins at the solenoid valve plug (especially in machines operating in wet/muddy conditions)
• ECM internal fault or corrupted software calibration (less common but possible in older units)
• Voltage supply issues from damaged main power harness or poor grounding connections

How to Troubleshoot and Fix Code P195

Step 1: Visual Inspection Begin by inspecting the hydraulic pump solenoid connector and wiring harness for obvious damage. On used excavators, check for harness chafing where wires route near moving components or sharp edges. Clean any corrosion from connector pins using electrical contact cleaner.

Step 2: Electrical Testing Using a multimeter, check the solenoid coil resistance (typically 8-15 ohms for Sany systems—consult service manual for exact specs). Test supply voltage at the connector with ignition on (should read 12-24V depending on system). Verify ground continuity between the solenoid ground wire and chassis.

Step 3: Advanced Diagnostics Connect Sany diagnostic software (PC Suite or equivalent) to read live data and check for intermittent signal dropouts. Perform a solenoid activation test through the software to confirm mechanical operation. If voltage and resistance readings are normal but the code persists, inspect the ECM connector pins for corrosion and check for ECM software updates.

Step 4: Component Replacement Replace the solenoid valve if resistance is out of spec or if it fails the activation test. For used machines, consider replacing the entire wiring harness section to the pump if insulation damage is evident, as this prevents recurring failures.

Disclaimer: This guide provides general troubleshooting information. Always consult the official Sany service manual and consider professional diagnostic assistance for complex electrical issues or if unfamiliar with high-voltage hydraulic systems.