C0643

Step 1: Perform visual inspection of right front wheel well area, examining the normal force sensor wiring harness for chafing, pinching, heat damage, or contact with moving suspension components. Check connector at sensor for corrosion, moisture intrusion, or bent pins.

Step 2: Disconnect the right front normal force sensor connector and measure voltage at the vehicle harness side connector with ignition on. Signal wire should read approximately 5V reference voltage; reading of 12V+ indicates short to voltage in harness requiring repair.

Step 3: With sensor disconnected, measure resistance of the sensor between signal and ground terminals using a digital multimeter. Compare readings to manufacturer specifications (typically 1-5K ohms); infinite or very low resistance indicates sensor failure.

Step 4: If wiring and sensor test within specifications, check for proper sensor ground circuit continuity to chassis control module. Measure less than 1 ohm resistance from sensor ground pin to module ground; high resistance indicates ground circuit fault.

Step 5: Reconnect sensor and monitor live data stream voltage values while manually compressing and extending the right front suspension through its travel. Voltage should vary smoothly between approximately 0.5-4.5V; erratic spikes or constant high reading confirms sensor or wiring fault.

Step 6: Clear codes, perform test drive including varied road conditions and suspension loading scenarios, then re-scan for code recurrence. If code returns immediately without physical load changes, suspect chassis control module fault requiring replacement or reprogramming.