What is XCMG XE490D 3.3 CM2250 Fault Code 1695?

Fault Code 1695 indicates a Fuel Control Actuator (FCA) circuit malfunction, specifically detecting an incorrect voltage response or open/short circuit in the fuel metering system of the Cummins CM2250 engine. This code directly affects the Electronic Control Module's (ECM) ability to precisely regulate fuel delivery to the high-pressure common rail injection system.

In the XCMG XE490D excavator equipped with the CM2250 engine, this fault compromises fuel atomization and injection timing. The Fuel Control Actuator is a critical electromagnetic valve that meters fuel flow from the supply pump to the high-pressure rail. When the ECM detects voltage signals outside the expected 0.5-5.0V range or encounters resistance issues, it triggers Code 1695 and may initiate protective engine derating to prevent damage.

Common Symptoms

• Check Engine Light (CEL) illuminates on the instrument cluster with potential amber warning indicators
• Engine power derate limiting maximum RPM to 1500-1800 range, severely reducing hydraulic performance and digging force
• Rough idle or engine stumbling during low-load operations or when transitioning from idle to working throttle
• Difficulty starting or extended cranking time, especially during cold starts
• Black smoke emissions from exhaust due to improper fuel metering and incomplete combustion

Potential Causes

The most common technical causes for Code 1695 on used XCMG excavators include:

• FCA solenoid internal failure due to coil winding breakdown (common after 6,000+ operating hours)
• Corroded or damaged wiring harness at the FCA connector, particularly where the harness routes near the engine block and experiences heat cycling
• Contaminated fuel system causing the FCA valve to stick or respond sluggishly
• ECM internal driver circuit failure (less common but possible in high-hour machines)
• Connector pin corrosion at the 3-pin FCA connector due to moisture infiltration in harsh working environments
• Rubbed or chafed wiring at known wear points near the fuel pump mounting bracket

How to Troubleshoot and Fix Code 1695

Step 1: Visual Inspection Disconnect the battery and inspect the FCA connector (located on the fuel pump assembly). Look for corroded pins, moisture, or damaged seals. On used excavators, check the entire harness routing for abrasion points where the wiring contacts metal surfaces or moves with engine vibration.

Step 2: Electrical Testing Using a digital multimeter, measure resistance across the FCA terminals (connector disconnected). Specification is typically 2-4 ohms. Then check for voltage supply from the ECM with the key on, engine off—should read approximately 5V reference. Any reading outside these parameters indicates either FCA failure or harness issues.

Step 3: Signal Testing Connect Cummins INSITE diagnostic software or compatible scan tool to monitor live FCA command vs. actual response data. Command the FCA through various duty cycles (20%, 50%, 80%) and observe response time. Delayed or erratic response confirms actuator failure.

Step 4: Harness Continuity Check continuity and resistance on all three wires from the ECM connector to the FCA connector. Pay special attention to ground circuit integrity, as this is a common failure point in used machines operating in wet or corrosive conditions.

Step 5: Component Replacement If testing confirms FCA failure, replace with a genuine Cummins 4954328 or equivalent OEM part. After installation, perform a fuel system prime and use diagnostic software to clear codes and verify proper FCA response.

For used excavators specifically: Always inspect the fuel filter housing for water contamination and replace both primary and secondary fuel filters before condemning the FCA, as contaminated fuel accelerates actuator wear.

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Disclaimer: This guide provides general diagnostic information. Always consult the XCMG service manual and Cummins troubleshooting procedures specific to your machine's serial number. If unfamiliar with high-pressure fuel systems or electrical diagnostics, seek assistance from a certified Cummins or XCMG technician to avoid injury or further damage.