Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2013 Infiniti M56 BaseFACTORY OEM SERVICE PROCEDURE
With 4WAS
STEERING CONTROL SYSTEM (WITH 4WAS) DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC | Description |
|---|---|
| DTC C1621, C1622 | 4WAS FRONT ACTUATOR |
| DTC C1627 | 4WAS FRONT ACTUATOR |
| DTC C1628 | 4WAS FRONT ACTUATOR |
| DTC C1631, C1632 | 4WAS FRONT CONTROL UNIT |
| DTC C1633 | 4WAS FRONT CONTROL UNIT |
| DTC C1651 | IGNITION POWER SUPPLY |
| DTC C1652 | 4WAS FRONT MOTOR POWER SUPPLY |
| DTC C1654 | 4WAS FRONT ACTUATOR RELAY |
| DTC C1655 | 4WAS FRONT DRIVER |
| DTC C1661 | 4WAS FRONT LOCK SOLENOID VALVE |
| DTC C1667 | LOCK INSERTION |
| DTC C1668 | LOCK HOLDER GAP DETECT |
| DTC C1669 | INCOMPLETE LOCK RELEASE |
| DTC C1671 | ACTUATOR ADJUSTMENT NOT PERFORMED |
| DTC C1672 | INCOMPLETE ACTUATOR ADJUSTMENT |
| DTC C1684, C1685 | 4WAS MAIN CONTROL UNIT COMMUNICATION |
| DTC C1686 | 4WAS MAIN CONTROL UNIT |
| DTC U1000, U1002 | 4WAS COMMUNICATION CIRCUIT |
| DTC U1010 | 4WAS COMMUNICATION CIRCUIT |
| DTC C1900, C1901, C1906, C1907, C1927, C1933 | 4WAS MAIN CONTROL UNIT |
| DTC C1902, C1903, C1904, C1910, C1913 | 4WAS REAR MOTOR OUTPUT |
| DTC C1905, C1908, C1922, C1925, C1928 | 4WAS MAIN CONTROL UNIT |
| DTC C1909 | 4WAS MAIN CONTROL UNIT |
| DTC C1911, C1912 | 4WAS REAR MOTOR POWER SUPPLY |
| DTC C1914 | REAR WHEEL STEERING ANGLE SENSOR |
| DTC C1915, C1916 | REAR WHEEL STEERING ANGLE SENSOR |
| DTC C1917, C1918 | REAR WHEEL STEERING ANGLE SENSOR |
| DTC C1919 | VEHICLE SPEED SIGNAL |
| DTC C1920 | STEERING ANGLE SENSOR |
| DTC C1921 | ENGINE SPEED SIGNAL |
| DTC C1923 | STEERING ANGLE SENSOR |
| DTC C1924 | STEERING ANGLE SENSOR |
| DTC C1926, C1932 | STEERING ANGLE SENSOR |
| DTC C1930 | 4WAS FRONT CONTROL UNIT |
| DTC C1931 | 4WAS FRONT CONTROL UNIT COMMUNICATION |
| DTC U1000 | CAN COMM CIRCUIT |
| DTC U1010 | CONTROL UNIT (CAN) |
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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