Kobelco SK200-8 Fault Code A035: Complete Diagnostic Guide

What is Kobelco SK200-8 Fault Code A035?

Fault Code A035 on the Kobelco SK200-8 excavator indicates a malfunction in the engine revolution sensor circuit, specifically detecting an abnormal signal or voltage irregularity from the crankshaft position sensor.

This code triggers when the Engine Control Module (ECM) receives inconsistent or out-of-range signals from the engine speed sensor during operation. The crankshaft position sensor is critical for the SK200-8's Hino J05E engine, as it provides essential timing data for fuel injection, ignition timing coordination, and overall engine performance management. Without accurate engine speed readings, the ECM cannot properly regulate fuel delivery or monitor engine parameters, potentially leading to performance degradation or engine protection shutdowns.

Common Symptoms

When Code A035 is active on your SK200-8, you may experience:

• Engine warning light illuminated on the dashboard display panel
• Hard starting conditions or extended cranking time, especially when the engine is cold
• Rough idling or inconsistent engine RPM fluctuations during operation
• Power derate mode activation, limiting maximum engine speed to protect internal components
• Engine stalling unexpectedly during low-idle conditions or under sudden load changes

Potential Causes

The most common technical reasons for Code A035 on used SK200-8 excavators include:

• Crankshaft position sensor failure due to heat exposure or internal component degradation (common after 6,000+ operating hours)
• Damaged sensor wiring harness caused by rubbing against the engine block near the flywheel housing—a known wear point on this model
• Corroded or loose electrical connectors at the sensor or ECM connection points, especially in machines operated in wet or coastal environments
• Excessive air gap between the sensor tip and crankshaft reluctor wheel caused by improper installation or sensor mounting bracket wear
• ECM internal faults or corrupted software (rare, but possible in high-hour machines)

How to Troubleshoot and Fix Code A035

Step 1: Visual Inspection Begin by locating the crankshaft position sensor on the driver's side of the engine block, near the flywheel housing. Inspect the sensor mounting for physical damage, oil contamination, or metal debris accumulation. Check the wiring harness from the sensor to the ECM for visible abrasion, particularly where it routes near the engine mount—this is a common failure point on used SK200-8 models.

Step 2: Electrical Testing Disconnect the sensor connector and use a digital multimeter to check sensor resistance. The specification for the Hino J05E engine typically ranges between 190-250 ohms at room temperature. Next, check for voltage supply at the harness connector with the ignition on (should read approximately 8-12 volts). Inspect connector pins for corrosion, bent terminals, or moisture intrusion.

Step 3: Signal Testing and Air Gap Verification Reconnect the sensor and use Kobelco diagnostic software (APECS or compatible scan tool) to monitor the live sensor signal while cranking the engine. The signal should show consistent pulses corresponding to crankshaft rotation. Physically verify the air gap between the sensor tip and reluctor wheel is within specification (0.5-1.5mm). On used machines, check for reluctor wheel damage or excessive crankshaft end play.

Step 4: Component Replacement If testing confirms sensor failure, replace with a genuine Kobelco/Hino OEM sensor (Part No. YN20M00041P1 or equivalent). When installing, apply anti-seize compound to threads and ensure proper torque specifications. After replacement, clear codes using diagnostic software and perform a test run under load.

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Disclaimer: This guide provides general diagnostic information for experienced technicians. Always consult the official Kobelco service manual for your specific serial number and software version. If unfamiliar with electrical diagnostics or engine systems, seek assistance from a certified Kobelco dealer or qualified heavy equipment technician to prevent further damage.