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 (SEDAN) and SEAT BELTS (SEDAN) Article 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 SRS AIRBAG article. Do not 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 Airbag Diagnosis Sensor Unit or other Airbag System sensors with the Ignition ON or engine running, DO NOT 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. |
Service Notice and Precautions for Hydraulic Pump Electric Power Steering System
- Check each tire for proper air pressure and size. Refer to " «TIRE»(ref-576010-S09181922332013090900000) ".
- Verify that the steering system components are genuine NISSAN parts and have been installed properly.
- Check the steering column for loose mounting bolts.
- Check the steering gear assembly for loose mounting bolts. Check the inner sockets and outer sockets for damage or wear. Inspect the boots and seals for leakage of power steering fluid.
- Verify proper wheel alignment. Refer to " «INSPECTION AND ADJUSTMENT»(ref-576008-S04842544972013090900000) ".
- Check for any damage, wear, or modification to the suspension and body that would result in increased weight or an improper wheelarch height. Refer to " «WHEELARCH HEIGHT (UNLADEN*1)»(ref-576008-S04493153432013090900000) ".
- Check for proper battery voltage.
- Verify that all power steering pump assembly connections are clean and fully seated.
- Verify that only genuine NISSAN E-PSF is used. Use of any power steering fluid other than genuine NISSAN E-PSF will prevent the power steering system from proper operation.
- An audible high pitch noise may be heard from the engine compartment when the steering wheel is operated, particularly at low speeds such as a parking lot maneuver. This condition is not a malfunction, rather normal system operation. Steering at low speeds or parking lot maneuvers demands higher hydraulic assistance, resulting in larger power steering pump load and increased system noise.
- The power steering pump is electrically controlled by the power steering control module.
- Before connecting or disconnecting the power steering control module harness connectors, turn ignition switch "OFF" and disconnect battery ground cable. Battery voltage is applied to power steering control module even if ignition switch is turned "OFF".
Scheme 13
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 engine status signal to power steering control module via CAN communication. |
| Steering angle sensor | Transmits steering angle sensor signal to power steering control module via CAN communication. |
| Combination meter | Transmits vehicle speed signal to power steering control module via CAN communication. |
| Receives hydraulic pump electric power steering warning lamp signal from power steering control module via CAN communication. |
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 warning lamp 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-576015-S06791264102013090900000) ".
- 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 |
| 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. Continued operation of the steering wheel will cause the hydraulic pump electric power steering system to stop and the hydraulic pump electric power steering system warning lamp may come 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. |
| Data monitor | Input/Output data in the power steering control module can be read. |
SELF-DIAG RESULTS MODE
Refer to " DTC INDEX ".
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
| 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 | ||
|---|---|---|---|---|---|
| + | Signal name | Input/Output | |||
| 1 (W) | Ground | Battery power supply | Input | Always | Battery Voltage |
| 2 (B) | Ground | Ground | Always | 0 V | |
| 5 (BR) | Ground | Ignition power supply | Input | Ignition switch: ON | Battery Voltage |
| 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 |
| 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 " «DIAGNOSTIC WORK SHEET»(ref-576015-S16986990642013090900000) " and reproduce symptoms to understand them fully. Ask customer about his/her complaints carefully. Check symptoms by driving vehicle with customer, if necessary. CAUTION: Customers are not professional. Never make assumptions like "maybe the customer means that...," or "maybe the customer mentioned 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-576015-S15329197962013090900000) ". 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" of "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 malfunctioning 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-576015-S03202322192013090900000) ". Is any DTC detected? YES >> GO TO 6. NO >> Check harness and connectors based on the information obtained by interview.
- REPAIR OR REPLACE THE MALFUNCTIONING COMPONENTS. Repair or replace the malfunctioning components. Reconnect part or connector after repairing or replacing. When DTC is detected, erase self-diagnostic results for "EPS". >> GO TO 8 .
- IDENTIFY THE MALFUNCTIONING SYSTEM BY SYMPTOM DIAGNOSIS Estimate the malfunctioning system based on symptom diagnosis and perform inspection. Can the malfunctioning 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-576015-S25476293222013090900000) ".