Kobelco SK135SRLC-2 Fault Code P0336: Expert Diagnostic Guide

What is Kobelco SK135SRLC-2 Fault Code P0336?

Fault Code P0336 indicates a Crankshaft Position Sensor (CKP) "A" Circuit Range/Performance problem. This diagnostic trouble code means the Engine Control Module (ECM) has detected an irregular or inconsistent signal from the crankshaft position sensor, which monitors engine speed and crankshaft rotation timing.

The CKP sensor is critical for the SK135SRLC-2's fuel injection timing and ignition synchronization. This code specifically indicates the sensor signal doesn't match expected parameters—the sensor may be reading intermittently, producing erratic signals, or experiencing timing discrepancies. For Kobelco's Isuzu-powered engines in this series, precise crankshaft monitoring is essential for proper common rail fuel injection control and smooth diesel combustion.

When this fault activates, the ECM may switch to limp mode or use estimated crankshaft position values, significantly degrading machine performance and fuel efficiency.

Common Symptoms

• Check Engine Light or malfunction indicator lamp illuminated on the dashboard
• Rough or unstable idle with noticeable engine vibration
• Difficulty starting the engine, particularly when warm, or extended cranking periods
• Intermittent engine stalling or unexpected shutdown during operation
• Noticeable loss of power during digging or lifting operations, especially under heavy loads

Potential Causes

Crankshaft position sensor failure due to heat exposure or internal component degradation (common in machines with 4,000+ operating hours)

Damaged or corroded wiring harness between the CKP sensor and ECM—particularly at routing points near the engine block where vibration causes wire chafing

Contaminated sensor tip covered with metallic debris, oil residue, or carbon buildup affecting magnetic field detection

Incorrect air gap between the CKP sensor and crankshaft reluctor wheel (typically should be 0.5-1.2mm on this model)

Worn or damaged reluctor ring on the crankshaft with missing teeth or deformation

ECM ground connection issues or corroded connector pins at the sensor interface

How to Troubleshoot and Fix Code P0336

Step 1: Visual Inspection Locate the crankshaft position sensor on the engine block (typically near the flywheel housing). Inspect the wiring harness for obvious damage, abrasion, or melting. Check the connector for corrosion, bent pins, or moisture intrusion—common in used excavators exposed to harsh jobsite conditions.

Step 2: Sensor Air Gap Verification Using a feeler gauge, measure the gap between the sensor tip and reluctor wheel. The specification for SK135SRLC-2 is approximately 0.8-1.0mm. Clean any debris from the sensor face using brake cleaner and a soft cloth.

Step 3: Electrical Testing Disconnect the CKP sensor connector. Using a digital multimeter, measure sensor resistance (typically 200-1,000 ohms). Check the signal wire voltage with ignition on, engine off—should read approximately 5 volts reference from the ECM. Inspect ground circuit continuity to ensure less than 1 ohm resistance.

Step 4: Signal Testing Connect a Kobelco diagnostic tool or compatible OBD-II scanner capable of live data monitoring. Crank the engine and observe RPM signal—erratic readings or dropouts confirm sensor/circuit failure.

Step 5: Harness and Reluctor Inspection For persistent codes on used machines, remove the sensor and inspect the reluctor wheel for damage or metallic buildup. Trace the entire sensor harness to the ECM, checking for rub points against frame members or heat-damaged sections.

Replacement Note: When installing a new CKP sensor, always use OEM or quality aftermarket parts and apply anti-seize compound to threads. Clear codes and perform a test cycle under load.

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Disclaimer: This guide provides general diagnostic information. Always consult the Kobelco service manual for your specific serial number and seek professional assistance if unfamiliar with electrical diagnostics or engine systems.