Code
C1393
MITSUBISHI
C — Chassis
INCOMP.learn neutral(Lateral G)
Views:
UK: 19
EN: 21
RU: 9
AI status
Completed
Completed
100%
Causes
- Failed or out‑of‑range lateral G (accelerometer) sensor
- Incomplete or interrupted sensor calibration/learning procedure
- Low battery voltage or unstable supply during learn cycle
- Poor electrical connection (sensor harness, connector, ground)
- Damaged sensor or contamination (impact, water, corrosion)
- ECU/software error or CAN communication fault
Symptoms
- Stability control, ABS or traction warning lamp illuminated
- Loss or restriction of vehicle stability/traction assistance
- Stored freeze‑frame data showing failed calibration event
- Possible abnormal handling at the limits (if sensor output is wrong)
- Related DTCs for yaw/accel sensors or CAN communication may be present
What to check
- Read and record DTC(s) and freeze‑frame data with a capable scan tool
- Confirm battery voltage is within specification (typically ≥12.4 V) and charging system healthy
- Visually inspect lateral G sensor and harness for damage, corrosion, loose pins, water intrusion
- Verify vehicle is on a level surface and steering is centered before attempting learn
- Attempt a sensor recalibration/zeroing procedure with a factory scan tool and note any error messages
- Check for related communication codes (CAN, ABS module faults)
Signal parameters
- Lateral acceleration output (g) or sensor voltage output at idle and during gentle lateral input
- Sensor supply/reference voltage (typically ~5.0 V) and ground continuity
- Raw yaw rate and longitudinal G (if available) for consistency checks
- Calibration/learn status flag reported by ABS/ESC module
- CAN bus messages for sensor data and module status
Diagnostic algorithm
- Connect a diagnostic scan tool and record all stored DTCs and freeze‑frame data; note any additional ABS/ACC/CAN codes.
- Check battery voltage and charging system; charge or replace battery if voltage is low. Clear codes and attempt learn only with stable power supply.
- Visually inspect lateral G sensor location, connector and wiring for damage/corrosion; repair any issues and ensure good ground.
- Place vehicle on a level surface, set steering to straight ahead, immobilize wheels as required by the manufacturer procedure.
- Using a factory or OEM‑capable scan tool, perform the lateral G (accelerometer) neutral/zero calibration or “learn” procedure. Follow tool prompts exactly. If the learn completes, clear codes and road test to confirm no recurrence.
- If learn fails, monitor the sensor’s live data during the procedure: confirm sensor has proper reference voltage and ground, and that the reported lateral G value is stable and near zero when stationary.
- If voltage/ground/CAN are good but sensor output is erratic or out of range, replace the lateral G sensor and repeat calibration.
- If new sensor fails or no communication with module, inspect/repair wiring harness and CAN connections; if wiring and power are good, consider ABS/ESC module fault and consult manufacturer guidance for module bench testing or replacement.
- After repair and successful calibration, erase codes and perform a functional test/road test to ensure stability systems operate correctly.
Likely causes
- Lateral G sensor defective or internally drifted
- Loose/corroded connector or damaged wiring to sensor
- Battery voltage low or fluctuated during calibration attempt
- Vehicle not positioned correctly (not on level surface or steering not neutral) during learning
- Faulty ABS/vehicle stability control module preventing learning
Fault status
Status
Incomplete neutral (zero) learning for lateral G sensor — calibration failed or not completed. Stability control functionality may be limited.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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