Code
C1394
MITSUBISHI
C — Chassis
INCOMP.learn neutral(SAS)
Views:
UK: 16
EN: 19
RU: 18
AI status
Completed
Completed
100%
Causes
- Steering angle sensor neutral/center learn procedure was not completed or was interrupted
- Low or unstable battery/charging voltage during the learn procedure
- Steering wheel not centered or wheels not pointed straight ahead during learning
- Faulty or out‑of‑spec steering angle sensor
- Damaged wiring, poor connector contact, or corrosion at the SAS or related harness
- Related control module (ABS/ESC) fault or communication error on CAN bus
Symptoms
- Steering angle sensor calibration warning or ABS/ESC warning lamp illuminated
- Stability/traction control disabled or reduced functionality
- Diagnostic trouble code C1394 stored in chassis control module
- Incorrect steering angle values reported by scan tool (non‑zero at center, jumps or noise)
- Possible steering-related drivability/stability issues during cornering or braking
What to check
- Read all stored DTCs and freeze frame data from ABS/ESC and related modules
- Verify battery state of charge and charging system health (voltage stable at ~12.6–14.4 V during procedure)
- Confirm steering wheel is mechanically centered and front wheels are pointed straight ahead
- Inspect SAS connector and wiring for corrosion, pin damage, looseness, chafing or grounding faults
- Check for other related codes (CAN/U‑codes, ABS wheel speed) that could block learning
- Attempt SAS neutral/center learn with OEM scan tool and record any error messages
Signal parameters
- Steering angle reading (degrees) — should be ≈ 0° with wheels straight; no large jitter or sudden jumps
- SAS sensor supply voltage — stable reference (typically vehicle battery/regulated source) during learn
- CAN messages from ABS/ESC module present and valid during learning
- Sensor output signal(s) should change smoothly and proportionally when steering wheel is rotated
Diagnostic algorithm
- Capture all related codes and freeze frame from ABS/ESC and network modules; note battery voltage at time of fault.
- Verify steering is centered: set front wheels straight and ensure steering wheel is mechanically centered and secured if required by procedure.
- Check battery/charging: charge or replace battery if voltage low; ensure stable supply during learn.
- Inspect SAS connector and wiring harness for damage, corrosion or poor pins; repair any faults and ensure secure connections.
- Using the manufacturer’s scan tool, perform the SAS neutral/center learning procedure exactly per service manual. Record any errors or messages returned by the tool.
- If learn fails, monitor live steering angle values while turning the wheel slowly to check for smooth response, dead zones, noise or missing signal(s).
- If signals are missing, intermittent or out of range, test/replace the steering angle sensor per service procedures.
- If sensor and wiring check good but learn still fails, check ABS/ESC module communication and consider module reflash or replacement per manufacturer guidance.
- After repair or replacement, clear codes, repeat the learn procedure, and perform a road test to confirm no recurrence.
Likely causes
- SAS learn interrupted by low battery voltage or disconnection
- Steering wheel not fixed at true center during learn (wheels not straight)
- Loose/corroded connector at SAS or damaged coax/ ribbon cable
- Failed SAS internal electronics or worn sensor
- ABS/ESC module communication fault preventing learn
Fault status
Status
Incomplete steering angle sensor neutral (SAS) learn. SAS neutral position not registered — ESC/ABS/vehicle stability may be limited until successful learn.
Repair difficulty: Medium
Diagnostic time: 1.0-2.0 hours
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