Steering Control System: Other Nissan Rogue II

Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TENSIONER"

The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain types of collision. Information necessary to service the system safely is included in the SRS AIRBAG and SEAT BELTS article of this Service Information.

PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS

Scheme 8

Scheme 9

Scheme 10

Scheme 11

1. EPS control unit (1) is installed to steering column assembly.
2. EPS control unit performs an arithmetical operation on data, such as steering wheel turning force (sensor signal) from the torque sensor, vehicle speed signal, etc. Then it generates an optimum assist torque signal to the EPS motor according to the driving condition.
3. EPS control unit decreases the output signal to EPS motor during continuous extreme use of the power steering function (e.g., full steering) for protection of the EPS motor and EPS control unit (Overload protection control).

EPS MOTOR

EPS motor provides assist torque in proportion to the control signal from the EPS control unit.

REDUCTION GEAR

Reduction gear increases the assist torque provided from the EPS motor, and outputs to the column shaft.

Scheme 12

INPUT/OUTPUT SIGNAL

Communicates the signal from each control unit via CAN communication.

Scheme 13

1. EPS control unit performs an arithmetical operation on data, such as steering wheel turning force (sensor signal) from the torque sensor, vehicle speed signal, etc. Then it generates an optimum assist torque signal to the EPS motor according to the driving condition.
2. In case of an error in the electrical system, the fail-safe function stops output signals to the EPS motor. Refer to " «EPS SYSTEM: FAIL-SAFE»(ref-616763-S08122814832014051900000) ".
3. EPS control unit decreases the output signal to EPS motor during extreme use of the power steering function (e.g., full steering) for protection of the EPS motor and EPS control unit (Overload protection control).
4. Extensive steering at low speed will cause the EPS control unit and EPS motor to heat up. Once temperature reaches the critical point, the EPS control unit will reduce current to reduce heat up. System will recover as temperature lowers (reduced or no assistance).

EPS WARNING LAMP INDICATION

1. Turns ON when there is a malfunction in the EPS system. If ON, fail-safe mode is engaged and the system enters a manual steering state (turning force at steering wheel becomes heavy).
2. Also turns ON when ignition switch is turned ON, for purpose of lamp check. Turns OFF after the engine starts, if system is normal.

EPS SYSTEM: Fail-Safe

1. If any malfunction occurs in the system and the control unit detects the malfunction, the EPS warning lamp in the combination meter turns ON to indicate system malfunction.
2. When EPS warning lamp is ON, the system enters into a manual steering state. (turning force at steering wheel becomes heavy.)
3. Under abnormal vehicle speed signal conditions, vehicle speed is judged as constant.

EPS SYSTEM: Protection Function

While overload protection control is activated, assist torque gradually decreases and the steering wheel turning force becomes heavy. Assist torque returns to normal if the steering wheel is not turned for a while.

FUNCTION

CONSULT can display each diagnostic item using the diagnostic test modes shown following.

1. DTC
2. Freeze frame data (FFD)

SELF-DIAG RESULTS MODE

Refer to " DTC INDEX ".

When "CRNT" is displayed on self-diagnosis result.

1. The system is presently malfunctioning.

When "PAST" is displayed on self-diagnosis result.

1. System malfunction in the past is detected, but the system is presently normal.

FREEZE FRAME DATA (FFD)

The following vehicle status is recorded when DTC is detected and is displayed on CONSULT.

DATA MONITOR MODE

Note. The following table includes information (items) inapplicable to this vehicle. For information (items) applicable to this vehicle, refer to CONSULT display items.

PHYSICAL VALUES

Fail-Safe

1. If any malfunction occurs in the system and the control unit detects the malfunction, the EPS warning lamp in the combination meter turns ON to indicate system malfunction.
2. When EPS warning lamp is ON, the system enters into a manual steering state. (turning force at steering wheel becomes heavy.)
3. Under abnormal vehicle speed signal conditions, vehicle speed is judged as constant.

Protection Function

EPS control unit decreases the output signal to EPS motor during continuous extreme use of the power steering function (e.g., full steering) for protection of the EPS motor and EPS control unit (Overload protection control).

DETAILED FLOW

1. COLLECT THE INFORMATION FROM THE CUSTOMER Get the detailed information from the customer about the symptom (the condition and the environment when the incident/malfunction occurred) using the diagnosis worksheet. : GO TO 2.
2. PERFORM THE SELF-DIAGNOSIS Check the DTC display with the self-diagnosis function. Refer to " «CONSULT FUNCTION»(ref-616763-S37783311352014051900000) ". Is there any DTC displayed? YES: Record or print DTC and freeze frame data (FFD). GO TO 3. NO: GO TO 4 .
3. PERFORM THE SYSTEM DIAGNOSIS Perform the diagnosis applicable to the displayed DTC. Refer to " «DTC INDEX»(ref-616763-S39748124832014051900000) ". : GO TO 6 .
4. CHECK THE WARNING LAMP FOR ILLUMINATION Check that the warning lamp illuminate. Is ON/OFF timing normal? YES: GO TO 5. NO: GO TO 2 .
5. PERFORM THE DIAGNOSIS BY SYMPTOM Perform the diagnosis applicable to the symptom. : GO TO 6.
6. REPAIR OR REPLACE THE MALFUNCTIONING PARTS Repair or replace the specified malfunctioning parts. : GO TO 7.
7. FINAL CHECK Perform the self-diagnosis again, and check that the malfunction is repaired completely. After checking, erase the self-diagnosis memory. Refer to " «CONSULT FUNCTION»(ref-616763-S37783311352014051900000) ". Is no other DTC present and the repair completed? YES: Inspection End. NO: GO TO 3 .

Component Function Check

1. CHECK THE ILLUMINATION OF THE EPS WARNING LAMP Check that the EPS warning lamp turns ON when ignition switch turns ON. Then, EPS warning lamp turns OFF after the engine is started. Is the inspection result normal? YES: Inspection End. NO: Perform trouble diagnosis. Refer to " «DIAGNOSIS PROCEDURE»(ref-616763-S04827632902014051900000) ".