DETAIED FLOW
- 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.
- PERFORM THE SELF-DIAGNOSIS Check the DTC display with the self-diagnosis function. Refer to " «CONSULT-III FUNCTION»(ref-405889-S41019481342011062300000) ". Is there any DTC displayed? YES: GO TO 3. NO: GO TO 4 .
- PERFORM THE SYSTEM DIAGNOSIS Perform the diagnosis applicable to the displayed DTC. Refer to " «DTC INDEX»(ref-405889-S23690091162011062300000) ". GO TO 6 .
- 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 .
- PERFORM THE DIAGNOSIS BY SYMPTOM Perform the diagnosis applicable to the symptom. GO TO 6.
- REPAIR OR REPLACE THE MALFUNCTIONING PARTS Repair or replace the specified malfunctioning parts. GO TO 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-III FUNCTION»(ref-405889-S41019481342011062300000) ". Is no other DTC present and the repair completed? YES: INSPECTION END NO: GO TO 3 .
Scheme 4
FUNCTION
CONSULT-III can display each diagnostic item using the diagnostic test modes shown below.
| Diagnostic test mode | Function |
|---|---|
| ECU identification | Steering column assembly number can be read. |
| Self-diagnostic results | Self-diagnostic results can be read and erased quickly. |
| Data monitor | Input/Output data in the EPS control unit can be read. |
DIAGNOSTIC TEST MODE FUNCTION CHART
Display Item List
Refer to " DTC INDEX ".
| Monitor item (Unit) | Remarks |
|---|---|
| BATTERY VOLT (V) | Displays the power supply voltage for EPS control unit. |
| TORQUE SENSOR (Nm) | Displays steering wheel turning force detected by torque sensor. |
| MOTOR SIG (A) | Displays the current commanded value to EPS motor. |
| MOTOR CURRENT (A) | Displays the current value consumed by EPS motor. |
| ASSIST TORQUE (Nm) | Displays assist torque being output by the electric power steering. |
| C/U TEMP (°C) | Displays the temperature of the EPS control unit. |
| ASSIST LEVEL (%) | Normally displays 100%. In case of an excessive stationary steering, the assist curvature gradually falls. However, it return to 100% when left standing. |
| VEHICLE SPEED (km/h) or (MPH) | Vehicle speed is displayed from vehicle speed signal via CAN communication. |
| WARNING LAMP (On/Off) | EPS warning lamp control status is displayed. |
| ENGINE STATUS (STOP/RUN/STALL/CRANK) | Engine speed is displayed from engine status signal via CAN communication. |
| MOTOR TEMP (°C) | Displays the temperature of EPS motor. |
| VHCL SPD CALC (km/h) or (MPH) | Displays vehicle speeds used for controlling EPS. |
DISPLAY ITEM LIST
Special Repair Requirement
- ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION Always perform the neutral position adjustment for the steering angle sensor, when replacing the steering column assembly. Refer to " «ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION : SPECIAL REPAIR REQUIREMENT»(ref-405867-S30954813092011062300000) ". (VDC models) END
- ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION Always perform the neutral position adjustment for the steering angle sensor, when replacing the steering column assembly. Refer to " «ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION : SPECIAL REPAIR REQUIREMENT»(ref-405867-S30954813092011062300000) ". (VDC models) END
- ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION Always perform the neutral position adjustment for the steering angle sensor, when replacing the steering column assembly. Refer to " «ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION : SPECIAL REPAIR REQUIREMENT»(ref-405867-S30954813092011062300000) ". (VDC models) END
- ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION Always perform the neutral position adjustment for the steering angle sensor, when replacing the steering column assembly. Refer to " «ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION : SPECIAL REPAIR REQUIREMENT»(ref-405867-S30954813092011062300000) ". (VDC models) END
- ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION Always perform the neutral position adjustment for the steering angle sensor, when replacing the steering column assembly. Refer to " «ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION : SPECIAL REPAIR REQUIREMENT»(ref-405867-S30954813092011062300000) ". (VDC models) END
- ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION Always perform the neutral position adjustment for the steering angle sensor, when replacing the steering column assembly. Refer to " «ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION : SPECIAL REPAIR REQUIREMENT»(ref-405867-S30954813092011062300000) ". (VDC models) END
- ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION Always perform the neutral position adjustment for the steering angle sensor, when replacing the steering column assembly. Refer to " «ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION : SPECIAL REPAIR REQUIREMENT»(ref-405867-S30954813092011062300000) ". (VDC models) END
- ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION Always perform the neutral position adjustment for the steering angle sensor, when replacing the steering column assembly. Refer to " «ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION : SPECIAL REPAIR REQUIREMENT»(ref-405867-S30954813092011062300000) ". (VDC models) END
PHYSICAL VALUES
| Terminal No. (Wire Color) | Description | Condition | Value (Approx.) | ||
|---|---|---|---|---|---|
| + | Signal name | Input/Output | |||
| 1 (R) | Ground | Battery power supply | Input | Always | Battery voltage |
| 2 (B) | Ground | Ground | Output | Always | 0 V |
| 3 (W) | Ground | Ignition power supply | Input | Ignition switch: ON | Battery voltage |
| Ignition switch: OFF | 0 V | ||||
| 5 (L) | Ground | CAN-H | Input/Output | ||
| 7 (P) | Ground | CAN-L | Input/Output | ||
EPS CONTROL UNIT TERMINALS DESCRIPTION CHART
Scheme 5
Scheme 6
Scheme 7
Fail-Safe
- If any malfunction occurs in the system, and control unit detects the malfunction, EPS warning lamp on combination meter turns ON to indicate system malfunction.
- When EPS warning lamp is ON, enters into a manual steering state. (Control turning force steering wheel becomes heavy.)
FOR USA AND CANADA : 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. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the "SRS AIR BAG" and "SEAT BELT" of this Service Information.
| WARNING | To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in the event of a collision that would result in air bag inflation, all maintenance must be performed by an authorized NISSAN/INFINITI dealer. Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag Module, see the SRS AIR BAG article. Never use electrical test equipment on any circuit related to the SRS unless instructed to in this Service Information. SRS wiring harnesses can be identified by yellow and/or orange harnesses or harness connectors. |
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
| WARNING | When working near the Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the ignition ON or engine running, never use air or electric power tools or strike near the sensor(s) with a hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly causing serious injury. When using air or electric power tools or hammers, always switch the ignition OFF, disconnect the battery, and wait at least 3 minutes before performing any service. |
FOR USA AND CANADA : Precaution Necessary for Steering Wheel Rotation after Battery Disconnect
Note. Before removing and installing any control units, first turn the ignition switch to the LOCK position, then disconnect both battery cables. After finishing work, confirm that all control unit connectors are connected properly, then re-connect both battery cables. Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work. If a DTC is detected, perform trouble diagnosis according to self-diagnosis results.
For vehicle with steering lock unit, if the battery is disconnected or discharged, the steering wheel will lock and cannot be turned.
If turning the steering wheel is required with the battery disconnected or discharged, follow the operation procedure below before starting the repair operation.
FOR USA AND CANADA : Service Notice or Precautions for EPS System
Check the following item when performing the trouble diagnosis.
Scheme 8
Scheme 9
- Check any possible causes by interviewing the symptom and it's condition from the customer if any malfunction, such as EPS warning lamp is turned ON, occurs.
- Check if air pressure and size of tires are proper, the specified part is used for the steering wheel, and control unit is genuine part.
- Check if the connection of steering column assembly and steering gear assembly is proper (there is no looseness of mounting bolts, damage of rods, boots or sealants, and leakage of grease, etc).
- Check if the wheel alignment is adjusted properly.
- Check if there is any damage or modification to suspension or body resulting in increased weight or altered ground clearance.
- Check if installation conditions of each link and suspension are proper.
- Check if the battery voltage is proper.
- Check connection conditions of each connector are proper.
- Before connecting or disconnecting the EPS control unit harness connector, turn ignition switch "OFF" and disconnect battery ground cable. Because battery voltage is applied to EPS control unit even if ignition switch is turned "OFF".
- When connecting or disconnecting pin connectors into or from EPS control unit, take care not to damage pin terminals (bend or break). When connecting pin connectors, make sure that there are no bends or breaks on EPS control unit pin terminal.
FOR MEXICO : 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 AIR BAG" and "SEAT BELT" of this Service Information.
| WARNING | To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in the event of a collision which would result in air bag inflation, all maintenance must be performed by an authorized NISSAN/INFINITI dealer. Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag Module, see the SRS AIR BAG article. Never use electrical test equipment on any circuit related to the SRS unless instructed to in this Service Information. SRS wiring harnesses can be identified by yellow and/or orange harnesses or harness connectors. |
| WARNING | When working near the Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the ignition ON or engine running, never use air or electric power tools or strike near the sensor(s) with a hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly causing serious injury. When using air or electric power tools or hammers, always switch the ignition OFF, disconnect the battery, and wait at least 3 minutes before performing any service. |
FOR MEXICO : Precaution Necessary for Steering Wheel Rotation after Battery Disconnect
Note. Before removing and installing any control units, first turn the ignition switch to the LOCK position, then disconnect both battery cables. After finishing work, confirm that all control unit connectors are connected properly, then re-connect both battery cables. Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work. If a DTC is detected, perform trouble diagnosis according to self-diagnosis results.
For vehicle with steering lock unit, if the battery is disconnected or discharged, the steering wheel will lock and cannot be turned.
If turning the steering wheel is required with the battery disconnected or discharged, follow the operation procedure below before starting the repair operation.
FOR MEXICO : Service Notice or Precautions for EPS System
Check the following item when performing the trouble diagnosis.
- Check any possible causes by interviewing the symptom and it's condition from the customer if any malfunction, such as EPS warning lamp is turned ON, occurs.
- Check if air pressure and size of tires are proper, the specified part is used for the steering wheel, and control unit is genuine part.
- Check if the connection of steering column assembly and steering gear assembly is proper (there is no looseness of mounting bolts, damage of rods, boots or sealants, and leakage of grease, etc).
- Check if the wheel alignment is adjusted properly.
- Check if there is any damage or modification to suspension or body resulting in increased weight or altered ground clearance.
- Check if installation conditions of each link and suspension are proper.
- Check if the battery voltage is proper.
- Check connection conditions of each connector are proper.
- Before connecting or disconnecting the EPS control unit harness connector, turn ignition switch "OFF" and disconnect battery ground cable. Because battery voltage is applied to EPS control unit even if ignition switch is turned "OFF".
- When connecting or disconnecting pin connectors into or from EPS control unit, take care not to damage pin terminals (bend or break). When connecting pin connectors, make sure that there are no bends or breaks on EPS control unit pin terminal.
Scheme 10
Refer to " COMPONENTS " for symbols in the figure.