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 AIRBAG and SEAT BELTS of this Service Information.
| WARNING | Always observe the following items for preventing accidental activation. 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 " SRS AIR BAG ". 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 | Always observe the following items for preventing accidental activation. 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. |
Scheme 11
Scheme 11: Precautions for Removing Battery Terminal
- When removing the 12V battery terminal, turn OFF the ignition switch and wait at least 30 seconds. NOTE: ECU may be active for several tens of seconds after the ignition switch is turned OFF. If the battery terminal is removed before ECU stops, then a DTC detection error or ECU data corruption may occur.
- For vehicles with the 2-batteries, be sure to connect the main battery and the sub battery before turning ON the ignition switch. NOTE: If the ignition switch is turned ON with any one of the terminals of main battery and sub battery disconnected, then DTC may be detected.
- After installing the 12V battery, always check "Self Diagnosis Result" of all ECUs and erase DTC. NOTE: The removal of 12V battery may cause a DTC detection error.
Service Notice and Precautions for Hydraulic Pump Electric Power Steering System
- Check if air pressure and size of tires are proper, the specified part is used for the steering wheel is genuine part.
- Check if the connection of steering column assembly and steering gear assembly is proper (there is not 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.
- Check that NISSAN genuine power steering fluid (E-PSF) is used. If power steering fluid other than genuine fluid is used, steering may become extremely hard.
- You may hear a high pitch noise from the front of the vehicle when the steering wheel is operated, especially at low speed such as a parking lot. However this is not a malfunction. Steer at low speed condition makes higher load for steering rack, so pump works higher rotation to provide more hydraulic flow to create more power assistance for lighter steering effort. This pump rotation is electrically controlled based on rotation map in ECU.
- Before connecting or disconnecting the power steering control module harness connector, turn ignition switch "OFF" and disconnect battery ground cable. Because battery voltage is applied to power steering control module even if ignition switch is turned "OFF".
Scheme 12
Scheme 12: Component Parts Location
| No. | Component | Function |
|---|
| 1. | Steering angle sensor | Transmits mainly the following signals to power steering control module via CAN communication. Steering angle sensor signal |
| 2. | Combination meter | Transmits mainly the following signals to power steering control module via CAN communication. Vehicle speed signal Refer to " METER SYSTEM: COMPONENT PARTS LOCATION " for detailed installation location. |
| The hydraulic pump electric power steering system warning lamp turns ON according to the signal received by CAN communication from the power steering control module. |
| 3. | Hydraulic pump electric power steering system warning lamp (In combination meter) | " HYDRAULIC PUMP ELECTRIC POWER STEERING SYSTEM: SYSTEM DESCRIPTION " |
| 4. | ECM | Transmits mainly the following signals to power steering control module via CAN communication. Engine status signal Refer to " ENGINE CONTROL SYSTEM: COMPONENT PARTS LOCATION " for detailed installation location. |
| 5. | Power steering oil pump assembly | Reservoir tank | " POWER STEERING OIL PUMP ASSEMBLY " |
| 6. | Power steering oil pump |
| 7. | Power steering motor |
| 8. | Power steering control module |
RESERVOIR TANK
Fluid is filled from the reservoir tank.
POWER STEERING OIL PUMP
The power steering oil pump is driven by the power steering motor and generates hydraulic oil pressure in the system.
POWER STEERING MOTOR
The power steering motor is controlled by the power steering control module and drives the power steering oil pump.
POWER STEERING CONTROL MODULE
By receiving steering angle sensor signal and vehicle speed signal, the power steering control module calculates hydraulic pressure of the hydraulic pump electric power steering system according to the driving conditions. The power steering control module controls the power steering motor.
INPUT/OUTPUT SIGNAL
Communicates the signal from each control unit via CAN communication.
| Control unit | Signal status |
|---|
| ECM | Transmits mainly the following signals to power steering control module via CAN communication. Engine status signal |
| Steering angle sensor | Transmits mainly the following signals to power steering control module via CAN communication. Steering angle sensor signal |
| Combination meter | Transmits mainly the following signals to power steering control module via CAN communication. Vehicle speed signal |
| Receives mainly the following signals from power steering control module via CAN communication. Hydraulic pump electric power steering warning lamp signal |
CONDITIONS FOR HYDRAULIC PUMP ELECTRIC POWER STEERING WARNING LAMP ON
- When the hydraulic pump electric power steering system is operating and steering assist force is being generated, the hydraulic pump electric power steering warning lamp is OFF.
- When the hydraulic pump electric power steering system is stopped by the fail-safe or protective function and steering assist force is not being generated, the hydraulic pump electric power steering warning lamp turns ON to inform the driver that the system is in the manual steering state. NOTE: When the hydraulic pump electric power steering system turns ON according to the protection system, the cause is internal high temperature state of the hydraulic pump electric power steering system. By stopping the engine, internal temperature of the system decreases. After starting the engine, the system returns to the normal state and the hydraulic pump electric power steering system warning lamp turns OFF. (The system is not malfunctioning.) For information about the protective function, refer to " «HYDRAULIC PUMP ELECTRIC POWER STEERING SYSTEM: PROTECTION FUNCTION»(ref-672658-S32788473792014112400000) ".
- When the ignition switch is turned ON, this lamp turns ON for lamp check (system check). When the system is operating normally, the lamp turns OFF after the engine starts.
| Condition | Hydraulic pump electric power steering warning lamp |
|---|
| Ignition switch ON. (Lamp check) | ON |
| After engine start (steering assist force is generated) | OFF |
| When steering assist is stopped | ON |
HYDRAULIC PUMP ELECTRIC POWER STEERING SYSTEM: Fail-safe
When an error occurs in the hydraulic pump electric power steering system, fail-safe brings the system to a halt (manual steering) or restricted (constant steering assist level) state. When the system is in a halt state, fail-safe turns ON the hydraulic pump electric power steering warning lamp to warn the driver that the hydraulic pump electric power steering system is in the manual steering state.
| DTC | Fail-safe condition |
|---|
| C1143 | Certain steering assist force |
| C1601 | Manual steering state |
| C1602 | Certain steering assist force |
| C1606 | Manual steering state |
| C1607 | Certain steering assist force |
| C1608 | Manual steering state |
| U1000 | Normal control NOTE: If the cause is in a different ECU, the state changes to fixed steering assist force. |
| NOTE |
|---|
| If the cause is in a different ECU, the state changes to fixed steering assist force. |
HYDRAULIC PUMP ELECTRIC POWER STEERING SYSTEM: Protection Function
- When the steering wheel is operated repeatedly or turned all the way for a long period during parking or low speed driving, the function of the hydraulic pump electric power steering system becomes limited to prevent the system from overheating. If the steering wheel is operated further more, the hydraulic pump electric power steering system stops and the hydraulic pump electric power steering system warning lamp may be turned ON. In this case, the steering wheel operation temporarily becomes hard. This is not a malfunction. When the engine is turned OFF (ignition switch OFF) and steering operation is stopped for a while, the temperature of the hydraulic pump electric power steering system decreases and the steering operation returns to normal after restarting the engine.
- Then, the hydraulic pump electric power steering system warning lamp turns OFF. If the system is OFF under the protection state, the hydraulic pump electric power steering system warning lamp turns ON to warn that the system is in the manual steering state. (This is not a system malfunction.) In addition, the following DTC remains to distinguish from malfunction.
| DTC | Vehicle condition |
|---|
| C160A | The system temporarily enters the manual steering state. (This is not a hydraulic pump electric power steering system malfunction.) |
FUNCTION
CONSULT can display each diagnostic item using the diagnostic test modes shown as per the following.
| Diagnostic test mode | Function |
|---|
| ECU identification | The part number stored in the control unit can be read. |
| Self Diagnostic | Results Self-diagnostic results and freeze frame data can be read and erased quickly (1) |
| Data monitor | Input/Output data in the power steering control module can be read. |
| (1) The following diagnosis information is erased by erasing. |
| (1) | The following diagnosis information is erased by erasing. |
SELF-DIAG RESULTS MODE
When "CRNT" is displayed on self-diagnosis result.
- The system is presently malfunctioning.
When "PAST" is displayed on self-diagnosis result.
- System malfunction in the past is detected, but the system is presently normal.
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.
| Monitor item (Unit) | Remarks |
|---|
| BATTERY VOLT (V) | Displays the power supply voltage for power steering control module. |
| STR ANG SPD (deg/s) | Displays the steering angle speed based on the steering angle signal transmitted by CAN communications. |
| MOTOR CURRENT (A) | Displays the current value consumed by power steering control module. |
| MTR REV SPD COMM (RPM) | Displays the power steering motor speed command value. |
| MTR REV SPD (RPM) | Displays the power steering motor speed. |
| C/U TEMP (°C or °F) | Displays the temperature of the power steering control module. |
| C/U TEMP A (°C or °F) | Displays the temperature of the power steering control module. |
| MTR ASSIST (%) | Displays the current percentage of the allowable assist ratio power steering motor. |
| ESTM VHCL SPD (km/h or mph) | Displays the vehicle speed calculated by the power steering control module. |
| WARNING LAMP (On/Off) | Hydraulic pump electric power steering system warning lamp control status is displayed. |
| ENGINE STATUS (STOP/RUN/CRANK) | Engine speed is displayed from engine condition signal with CAN communication |
| VHCL SPD JUDGE (OK/NG) | Displays the receiving status of the vehicle speed signal transmitted by CAN communications. |
PHYSICAL VALUES
| Terminal No. (Wire Color) | Description | Condition | Value (Approx.) |
|---|
| + | | Signal name | Input/Output |
| 1 (R) | Ground | Battery power supply | Input | Always | 8.5 - 18.5 V |
| 2 (B) | Ground | Ground | | Always | 0 V |
| 5 (BR) | Ground | Ignition power supply | Input | Ignition switch: ON | 8.5 - 18.5 V |
| Ignition switch: OFF | 0 V |
| 7 (P) | | CAN-L | Input/Output | | |
| 8 (L) | | CAN-H | Input/Output | | |
Fail-safe
When an error occurs in the hydraulic pump electric power steering system, fail-safe brings the system to a halt (manual steering) or restricted (constant steering assist level) state. When the system is in a halt state, fail-safe turns ON the hydraulic pump electric power steering warning lamp to warn the driver that the hydraulic pump electric power steering system is in the manual steering state.
| DTC | Fail-safe condition |
|---|
| C1143 | Certain steering assist force |
| C1601 | Manual steering state |
| C1602 | Certain steering assist force |
| C1606 | Manual steering state |
| C1607 | Certain steering assist force |
| C1608 | Manual steering state |
| U1000 | Normal control NOTE: If the cause is in a different ECU, the state changes to fixed steering assist force. |
| NOTE |
|---|
| If the cause is in a different ECU, the state changes to fixed steering assist force. |
Protection Function
- When the steering wheel is operated repeatedly or turned all the way for a long period during parking or low speed driving, the function of the hydraulic pump electric power steering system becomes limited to prevent the system from overheating. If the steering wheel is operated further more, the hydraulic pump electric power steering system stops and the hydraulic pump electric power steering system warning lamp may be turned ON. In this case, the steering wheel operation temporarily becomes hard. This is not a malfunction. When the engine is turned OFF (ignition switch OFF) and steering operation is stopped for a while, the temperature of the hydraulic pump electric power steering system decreases and the steering operation returns to normal after restarting the engine.
- Then, the hydraulic pump electric power steering system warning lamp turns OFF. If the system is OFF under the protection state, the hydraulic pump electric power steering system warning lamp turns ON to warn that the system is in the manual steering state. (This is not a system malfunction.) In addition, the following DTC remains to distinguish from malfunction.
| DTC | Vehicle condition |
|---|
| C160A | The system temporarily enters the manual steering state. (This is not a hydraulic pump electric power steering system malfunction.) |
DETAILED FLOW
- INTERVIEW FROM THE CUSTOMER Clarify customer complaints before inspection. First of all, perform an interview utilizing reproduce symptoms as well as fully understand it. Ask customer about his/her complaints carefully. Check symptoms by driving vehicle with customer, if necessary. CAUTION: Customers are not professional. Never guess easily like "maybe the customer means that...," or "maybe the customer mentions this symptom". : GO TO 2.
- CHECK SYMPTOM Reproduce the symptom that is indicated by the customer, based on the information from the customer obtained by interview. Also check that the symptom is not caused by protection function. Refer to " «PROTECTION FUNCTION»(ref-672658-S12337811282014112400000) ". CAUTION: When the symptom is caused by normal operation, fully inspect each portion and obtain the understanding of customer that the symptom is not caused by a malfunction. : GO TO 3.
- CHECK VEHICLE CONDITION With CONSULT Turn ignition switch ON. Check "C/U TEMP" and "C/U TEMP A" in "DATA MONITOR" in "EPS". Monitor item Values C/U TEMP 90°C (194°F) or less C/U TEMP A 90°C (194°F) or less Is the inspection result normal? YES: GO TO 4. NO: Wait with the ignition switch OFF until the data monitor indication becomes 90 °C (194 °F) or less. Go to 4 after the temperature drops to 90 °C (194 °F) or less.
- PERFORM SELF-DIAGNOSIS With CONSULT Perform self-diagnosis. Is any DTC detected? YES: Record or print DTC and freeze frame data (FFD). GO TO 5. NO: GO TO 7 .
- RECHECK SYMPTOM With CONSULT Erase self-diagnostic results for "EPS". Perform DTC confirmation procedures for the error detected system. NOTE: If some DTCs are detected at the same time, determine the order for performing the diagnosis based on " «DTC INSPECTION PRIORITY CHART»(ref-672658-S08358399132014112400000) ". Is any DTC detected? YES: GO TO 6. NO: Check harness and connectors based on the information obtained by interview.
- REPAIR OR REPLACE ERROR-DETECTED PARTS Repair or replace error-detected parts. Reconnect part or connector after repairing or replacing. When DTC is detected, erase self-diagnostic results for "EPS". : GO TO 8 .
- IDENTIFY ERROR-DETECTED SYSTEM BY SYMPTOM DIAGNOSIS Estimate error-detected system based on symptom diagnosis and perform inspection. Can the error-detected system be identified? YES: GO TO 8. NO: Check harness and connectors based on the information obtained by interview.
- FINAL CHECK With CONSULT Check the reference value for power steering control module. Recheck the symptom and check that symptom is not reproduced on the same conditions. Is the symptom reproduced? YES: GO TO 3 . NO: INSPECTION END
Component Function Check
- CHECK THE ILLUMINATION OF THE HYDRAULIC PUMP ELECTRIC POWER STEERING WARNING LAMP Check that the hydraulic pump electric power steering warning lamp turns ON when ignition switch turns ON. Then, hydraulic pump electric power steering 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-672658-S38623076512014112400000) ".
