What is Komatsu PC220-7 Fault Code E113?

Fault Code E113 on the Komatsu PC220-7 indicates a malfunction in the Engine Oil Pressure Sensor Circuit. This diagnostic trouble code (DTC) is triggered when the Engine Control Module (ECM) detects an abnormal voltage signal from the oil pressure sensor, typically either too high (open circuit) or too low (short circuit) compared to the expected operating range.

The oil pressure sensor is a critical component in the PC220-7's SAA6D102E-2 engine monitoring system. It continuously sends voltage signals to the ECM to report lubricating oil pressure in real-time. When this communication fails, the ECM cannot accurately monitor whether sufficient oil pressure exists to protect critical engine components like bearings, camshafts, and the crankshaft. On used excavators, this code often appears due to sensor degradation, wiring harness damage from vibration, or connector corrosion—common issues in machines with 5,000+ operating hours.

Common Symptoms

When Code E113 is active on your PC220-7, you may experience:

• Check Engine Warning Light illuminated on the instrument cluster
• Engine derate or reduced power mode activated as a protective measure
• Audible alarm or buzzer indicating critical system fault
• Abnormal oil pressure readings on the gauge (reading zero, maximum, or fluctuating erratically)
• Hesitation during operation or the engine entering a limited RPM mode to prevent potential damage

Potential Causes

The most common technical causes for E113 on used PC220-7 excavators include:

• Failed oil pressure sensor due to internal element wear or thermal degradation (common after 3,000-6,000 hours)
• Damaged or frayed wiring harness along the engine's right side where the harness runs near the exhaust manifold and experiences heat/vibration
• Corroded or loose electrical connectors at the sensor or ECM interface, especially in machines operating in wet or coastal environments
• Short circuit to ground caused by harness chafing against the engine block or mounting brackets
• Open circuit due to broken wires inside the insulation (difficult to detect visually)
• ECM internal fault (rare, but possible in high-hour machines with electrical system history)

How to Troubleshoot and Fix Code E113

Step 1: Initial Visual Inspection Begin by locating the oil pressure sensor on the right side of the SAA6D102E-2 engine block, near the oil filter assembly. Disconnect the electrical connector and inspect for:

• Bent or corroded pins
• Oil contamination inside the connector (indicates sensor seal failure)
• Physical damage to the sensor body

Clean connectors with electrical contact cleaner and ensure tight connection upon reassembly.

Step 2: Electrical Testing Using a digital multimeter, perform these checks with the ignition OFF and sensor disconnected:

• Measure resistance across the sensor terminals (typically 50-150 ohms at room temperature; consult your service manual for exact specifications)
• Check for continuity to ground on the sensor body (should show infinite resistance/open circuit)
• Test the wiring harness from the sensor connector to the ECM for continuity and shorts to ground

Step 3: Harness Inspection (Critical for Used Machines) Trace the entire sensor wiring harness along its routing path. Pay special attention to:

• Areas where the harness contacts hot engine components or sharp edges
• Zip tie attachment points where vibration causes wire fatigue
• Rubber grommets where wires pass through bulkheads (common wear points)

Replace any sections showing abrasion, melted insulation, or brittleness.

Step 4: Sensor Replacement and Verification If electrical tests indicate sensor failure, install a genuine Komatsu oil pressure sensor (Part #6732-81-3140 or equivalent). Aftermarket sensors often have voltage output variations that trigger false codes. After replacement:

• Clear the fault code using Komatsu diagnostic software (KOMTRAX) or a compatible scan tool
• Start the engine and monitor for code recurrence
• Verify actual oil pressure with a mechanical oil pressure gauge to confirm proper engine lubrication

Step 5: ECM Evaluation If all sensors and wiring test within specifications but E113 persists, the ECM may require reprogramming or replacement. This is uncommon but documented in PC220-7s with electrical system damage history.

---

Disclaimer: This guide provides general troubleshooting procedures for Code E113. Always consult the official Komatsu PC220-7 service manual for detailed specifications and torque values. If you're uncomfortable with electrical diagnostics or lack proper tools, contact a certified Komatsu technician. Improper repairs can result in engine damage or safety hazards.