Sumitomo SH350HD-6 Fault Code 560: Meaning, Symptoms, and Fix Guide

What is Sumitomo SH350HD-6 Fault Code 560?

Fault Code 560 on the Sumitomo SH350HD-6 excavator indicates a malfunction in the Engine Oil Pressure Sensor Circuit or abnormally low oil pressure detected by the Engine Control Module (ECM). This diagnostic trouble code (DTC) is triggered when the ECM receives voltage readings outside the normal operating range from the oil pressure sensor, typically below 0.5V or above 4.5V, or when actual oil pressure falls below manufacturer-specified thresholds during engine operation.

This code is critical for the SH350HD-6 because the Isuzu engine (commonly paired with this model) relies on proper oil pressure monitoring to prevent catastrophic engine damage. The ECM uses oil pressure data to regulate engine performance, and when Code 560 activates, the system may initiate protective derate modes or automatic shutdown sequences to prevent bearing failure, piston seizure, or complete engine destruction.

Common Symptoms

When Code 560 is active on your Sumitomo SH350HD-6, operators typically experience:

• Oil pressure warning light illuminated on the instrument cluster (red oil can icon)
• Engine derate mode activated, limiting RPM to 1200-1500 range or reducing power output by 30-40%
• Audible alarm sounding continuously from the cab monitoring system
• Automatic engine shutdown after 30-60 seconds if critical low pressure is detected
• Rough idle or hesitation during hydraulic operations due to ECM fuel limiting strategies

Potential Causes

The most common technical failures causing Code 560 on used SH350HD-6 excavators include:

• Oil pressure sensor failure – Internal sensor diaphragm rupture or electrical component degradation (common after 6,000+ operating hours)
• Wiring harness damage – Chafing at the engine block mounting point near the oil filter housing where harness contacts frame rails
• Low engine oil level – Consumption through worn piston rings or external leaks from aging gaskets
• Defective ECM ground connections – Corrosion on G102 ground point located on left engine mount bracket
• Actual low oil pressure – Worn oil pump, clogged oil pickup screen, or excessive bearing clearances in high-hour machines
• Connector corrosion – Moisture intrusion in the 3-pin Deutsch connector at sensor interface

How to Troubleshoot and Fix Code 560

Step 1: Visual Inspection and Oil Level Verification Begin by checking engine oil level with the machine on level ground. Inspect for external oil leaks around the oil pan, valve covers, and hydraulic pump drive seals. Examine the oil pressure sensor (located near oil filter on left engine side) and its wiring harness for physical damage, oil contamination on connectors, or rubbing against frame components.

Step 2: Electrical Testing of Sensor Circuit Using a digital multimeter, disconnect the 3-pin sensor connector and measure resistance across sensor terminals. The sensor should read 50-150 ohms at room temperature. Check supply voltage at the harness connector with ignition on – you should see 5.0V ±0.25V on the signal wire. Measure resistance to ground on the sensor signal wire (harness side) with sensor disconnected; infinite resistance indicates proper insulation, while low resistance suggests a short circuit.

Step 3: Dynamic Pressure Testing Install a mechanical oil pressure gauge into the sensor port using appropriate adapter fittings. Start the engine and verify actual oil pressure: idle should show 10-15 PSI minimum, while 2000 RPM should produce 40-65 PSI. If mechanical gauge confirms adequate pressure but Code 560 persists, replace the oil pressure sensor (OEM Isuzu part recommended for longevity). If actual pressure is low, investigate oil pump condition, bearing clearances, or oil viscosity breakdown.

Step 4: Used Equipment Specific Checks For used excavators, thoroughly inspect connector pins for corrosion using electrical contact cleaner and wire brush. Check harness routing against factory service manual – many SH350HD-6 machines experience harness wear where it passes over the engine mount. Apply dielectric grease to all connectors after cleaning. Verify ECM software version using diagnostic software, as TSB updates may address false Code 560 triggers.

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Disclaimer: This guide provides general troubleshooting information for Sumitomo SH350HD-6 Fault Code 560. Always consult the manufacturer's official service manual and consider professional diagnostic assistance for complex repairs. Improper diagnosis may lead to expensive component replacement or engine damage.