Sany Excavator Fault Code P267: Complete Diagnostic Guide

What is Sany General Fault Code P267?

Fault Code P267 indicates a Fuel Injector Cylinder 5 Circuit Malfunction in Sany excavators. This diagnostic trouble code (DTC) is triggered when the Engine Control Module (ECM) detects an electrical abnormality in the circuit controlling the fuel injector for cylinder 5, such as an open circuit, short to ground, or resistance values outside specified parameters.

This code is critical for Sany excavators because improper fuel delivery to cylinder 5 directly impacts combustion efficiency, engine power balance, and emission control. Left unresolved, it can lead to severe engine misfires, increased diesel particulate filter (DPF) regeneration cycles, and potential catalytic converter damage—especially problematic in used machines with accumulated wear.

Common Symptoms

When Code P267 is active, operators typically experience:

• Engine warning light illuminated on the instrument cluster, often accompanied by a check engine lamp
• Noticeable rough idle or vibration due to cylinder 5 misfiring
• Reduced engine power (derate mode) particularly under heavy loads or high RPM
• Increased black or white exhaust smoke indicating incomplete combustion
• Elevated fuel consumption as the ECM attempts to compensate for the faulty injector circuit

Potential Causes

The most common technical reasons for P267 in Sany excavators include:

• Damaged injector wiring harness—particularly at rub points near the engine block or valve cover where vibration causes insulation wear
• Faulty fuel injector solenoid for cylinder 5 with internal coil failure or mechanical sticking
• Corroded or loose electrical connectors at the injector or ECM (extremely common in used machines exposed to moisture)
• ECM internal driver circuit failure affecting the cylinder 5 output channel
• Damaged injector seal or return line causing fuel contamination of electrical components

How to Troubleshoot and Fix Code P267

Step 1: Visual Inspection Begin by inspecting the fuel injector wiring harness for cylinder 5. Check for abraded insulation, pinched wires near mounting brackets, and corrosion on the injector connector. On used excavators, examine where the harness contacts the valve cover—this is a known wear point on Sany models.

Step 2: Electrical Testing Using a digital multimeter, perform resistance checks on the cylinder 5 injector. Disconnect the injector connector and measure resistance across the solenoid terminals—typical specification is 0.3-0.6 ohms (consult your Sany service manual). Also check for short to ground by measuring resistance between each terminal and engine block (should read infinite/OL).

Step 3: Swap Test If resistance values are correct, swap the cylinder 5 injector with a known-good injector from another cylinder. Clear codes and operate the machine. If P267 moves to the new cylinder location, the injector itself is faulty. If the code remains on cylinder 5, suspect wiring harness or ECM issues.

Step 4: ECM Signal Testing Using Sany diagnostic software or compatible scan tool, perform an injector activation test while monitoring voltage at the injector connector. You should see battery voltage pulsing during activation. No voltage indicates an ECM driver circuit failure.

For used excavators specifically, always clean connector terminals with electrical contact cleaner and apply dielectric grease before reassembly to prevent future corrosion-related faults.

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Disclaimer: This guide provides general diagnostic procedures. Always consult your Sany service manual for model-specific specifications. For complex ECM or fuel system repairs, professional consultation with a certified Sany technician is recommended.