Sany SY215C-A Fault Code P1335(14): Complete Diagnostic Guide

What is Sany SY215C-A Fault Code P1335(14)?

Fault Code P1335(14) indicates a Crankshaft Position Sensor (CKP) "A" Circuit Range/Performance Problem. This diagnostic trouble code (DTC) is triggered when the Engine Control Module (ECM) detects an irregular or inconsistent signal from the crankshaft position sensor that falls outside acceptable performance parameters.

The crankshaft position sensor is critical for your Sany SY215C-A's diesel engine operation. It monitors crankshaft speed and position, providing essential timing data to the ECM for fuel injection timing, ignition control, and engine synchronization. When this sensor's signal becomes erratic or out of specification—even if not completely failed—the ECM logs P1335(14) to prevent potential engine damage or performance issues.

Common Symptoms

When Code P1335(14) is active on your SY215C-A, you may experience:

• Check Engine Light (CEL) or malfunction indicator lamp illuminated on the instrument cluster
• Hard starting or extended cranking time, especially when the engine is cold
• Rough idle or engine misfires during operation, particularly at low RPMs
• Loss of power or engine hesitation under load during digging or lifting operations
• Intermittent stalling or unexpected engine shutdown, especially on used machines with worn components

Potential Causes

P1335(14) in used Sany excavators typically stems from these issues:

• Worn or damaged crankshaft position sensor due to heat exposure, vibration, or age-related deterioration
• Corroded or loose electrical connectors at the CKP sensor harness (common on machines operating in wet/muddy conditions)
• Damaged sensor wiring harness, particularly where cables run near hot engine components or sharp metal edges
• Excessive air gap between the sensor and crankshaft reluctor ring caused by mounting bracket wear or incorrect installation
• Contaminated reluctor ring with metal shavings, oil buildup, or debris affecting magnetic field reading
• Weak battery voltage or poor grounding affecting sensor signal quality in older electrical systems

How to Troubleshoot and Fix Code P1335(14)

Step 1: Visual Inspection Begin by locating the crankshaft position sensor (typically mounted near the crankshaft pulley or flywheel housing). Inspect the sensor connector for corrosion, bent pins, or moisture intrusion—common issues in used excavators. Check the wiring harness for abrasion points, particularly where it contacts the engine block or frame.

Step 2: Sensor Air Gap Measurement Using a feeler gauge, verify the air gap between the CKP sensor tip and the reluctor ring meets Sany specifications (typically 0.5-1.5mm). On high-hour machines, mounting bracket wear can increase this gap beyond tolerance. Clean any debris from the reluctor ring surface with a non-metallic brush.

Step 3: Electrical Testing Disconnect the sensor and use a digital multimeter to measure resistance across the sensor terminals (typically 200-1000 ohms at room temperature—consult your service manual). Test for voltage supply (usually 5V or 12V reference) and ground continuity at the harness connector. Check for AC voltage output while cranking the engine (should produce a waveform signal).

Step 4: Diagnostic Software Analysis Connect Sany diagnostic software or a compatible scan tool to view live data from the CKP sensor. Compare the signal pattern and frequency against specifications. Erratic readings or signal dropouts confirm sensor or wiring issues.

Step 5: Component Replacement If testing confirms sensor failure, replace the crankshaft position sensor with a genuine Sany or OEM-equivalent part. For used excavators, simultaneously inspect and replace the sensor harness connector if corrosion is present. After installation, clear the fault code and perform a test run under load.

Important for Used Machines: Before replacing expensive components, thoroughly inspect all electrical connections and harness routing. Many P1335(14) codes on older SY215C-A excavators result from connector corrosion or wire chafing rather than actual sensor failure.

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Disclaimer: This guide provides general troubleshooting information. Always consult your Sany service manual and consider professional diagnostic assistance for complex electrical issues. Improper repairs may void warranties or cause additional damage.