STEERING CONTROL SYSTEM

Transcription

1 STRG ST ST STRG TR SYST TTS WTUT RR TV STR S ST... 4 GSS RR WR W... 4 Work low...4 SYST SRT... 5 S SYST... 5 System iagram...5 System escription...5 omponent arts ocation...7 omponent escription...7 T/RUT GSS... 8 WR SUY GRU RUT... 8 escription...8 iagnosis rocedure...8 WR STRG S VV... 9 escription...9 iagnosis rocedure...9 omponent nspection...10 G S SG RUT...11 escription...11 iagnosis rocedure...11 V S SG RUT...14 escription...14 iagnosis rocedure...14 U GSS RT...16 WR STRG TR UT...16 Reference Value...16 Wiring iagram - TRY - TR WR STRG SYST ail-safe...20 SYT GSS...22 U STRG W TURG R (TRQU VRT)...22 escription...22 iagnosis rocedure...22 RUT...23 RUTS...23 recaution for Supplemental Restraint System (SRS) "R G" and "ST T R-T- SR"...23 recaution ecessary for Steering Wheel Rotation after attery isconnect...23 RV STT...25 WR STRG TR UT...25 xploded View...25 Removal and nstallation...25 WT RR TV STR S ST...26 GSS RR WRW...26 Work low...26 SYST SRT...28 RS SYST...28 System iagram...28 System escription...28 omponent arts ocation...30 omponent escription...31 S SYST...32 System iagram...32 System escription...32 omponent arts ocation...34 omponent escription...34 GSS SYST (RS TR UT)...35 ST ST-1

2 iagnosis escription SUT- unction T/RUT GSS , 1901, 1906, 1907, 1927 RS TR UT escription T ogic iagnosis rocedure Special Repair Requirement , 1903, 1904, 1910, 1913 RS TR UTUT escription T ogic iagnosis rocedure omponent nspection Special Repair Requirement , 1908, 1922, 1925, 1928 RS TR UT escription T ogic iagnosis rocedure Special Repair Requirement RS TR UT escription T ogic iagnosis rocedure Special Repair Requirement , 1912 RS TR WR SU- Y escription T ogic iagnosis rocedure omponent nspection (RS otor Relay) omponent nspection (oise Suppressor) Special Repair Requirement RR W STRG G SSR escription T ogic iagnosis rocedure omponent nspection Special Repair Requirement , 1916 RR W STRG - G SSR escription T ogic iagnosis rocedure omponent nspection Special Repair Requirement , 1918 RR W STRG - G SSR escription T ogic iagnosis rocedure omponent nspection Special Repair Requirement V S SG escription T ogic iagnosis rocedure Special Repair Requirement STRG G SSR escription T ogic iagnosis rocedure Special Repair Requirement G S SG escription T ogic iagnosis rocedure Special Repair Requirement STRG G SSR escription T ogic iagnosis rocedure Special Repair Requirement STRG G SSR escription T ogic iagnosis rocedure Special Repair Requirement STRG G SSR escription T ogic iagnosis rocedure Special Repair Requirement S TUTR TR UT (TR UT) escription T ogic iagnosis rocedure Special Repair Requirement U1000 RUT escription T ogic iagnosis rocedure Special Repair Requirement U1010 TR UT () escription T ogic iagnosis rocedure Special Repair Requirement ST-2

3 WR SUY GRU RUT...78 escription...78 iagnosis rocedure...78 omponent nspection (RS otor Relay)...80 omponent nspection (oise Suppressor)...81 WR STRG S VV...82 escription...82 iagnosis rocedure...82 omponent nspection...83 RS WRG...84 escription...84 omponent unction heck...84 iagnosis rocedure...84 Special Repair Requirement...85 ST SWT...86 escription...86 omponent unction heck...86 iagnosis rocedure...86 omponent nspection...86 Special Repair Requirement...87 U GSS RT...88 RS TR UT...88 Reference Value...88 Wiring iagram - RS SYST ail-safe...96 T nspection riority hart...98 T ndex...98 SYT GSS RS WRG S T TUR. 101 escription iagnosis rocedure RS WRG S T TUR escription iagnosis rocedure U STRG W TURG R (TRQU VRT) escription iagnosis rocedure RUT RUTS recaution for Supplemental Restraint System (SRS) "R G" and "ST T R-T- SR" recaution ecessary for Steering Wheel Rotation after attery isconnect RV STT RS TR UT xploded View Removal and nstallation RR TV STR xploded View Removal and nstallation ST ST-3

4 GSS RR WR W < S ST > [WTUT RR TV STR] S ST GSS RR WR W Work low T W 1.T T RT R T USTR : t is also important to clarify customer complaints before inspection. irst of all, reproduce symptoms and understand them fully. sk customer about his/her complaints carefully. n some cases, it is necessary to check symptoms by driving vehicle with customer. UT: ustomers are not professional. t is dangerous to make an easy guess like maybe the customer means that..., or maybe the customer mentions this symptom. >> G T T STTUS 1. ower steering fluid leakage and check the power steering fluid level. Refer to ST-11, "nspection". 2. heck the drive belt tension. Refer to -15, "hecking" (VQ35R), -163, "hecking" (V50V). 3. heck the power steering gear for damages, cracks and fluid leakage. Refer to ST-33, "nspection". 4. heck the relief oil pressure. Refer to ST-39, "VQ35R : nspection" (VQ35R), ST-45, "V50V : nspection" (V50V). >> G T 3. 3.GSS RT Y SYT erform the diagnosis by symptom. Refer to ST-22, "iagnosis rocedure". >> G T heck the input/output standard values for the power steering control unit. re the power steering control unit input/output values within standard ranges respectively? YS >> ST >> G T 2. ST-4

5 S SYST < SYST SRT > [WTUT RR TV STR] SYST SRT S SYST System iagram TR GR : ST RSS-ST VW SG0258G SG0376ZZ 1. Unified meter and / amp. 2. ower steering control unit 3. ower steering solenoid valve 4. Steering gear assembly 5. Gear housing assembly 6. Gear sub-assembly 7. inion 8. ower steering oil pump 9. Reservoir tank System escription : The S system controls the power steering solenoid valve through the power steering control unit. ST-5

6 S SYST < SYST SRT > [WTUT RR TV STR] The valve driving voltage to control the power steering solenoid valve varies according to the vehicle speed. RT R uring arking (When Turning The Steering Wheel To The Right.) SG0451G 1. ower steering solenoid valve is closed while a vehicle is stopped. 2. inion 1R, 2R and 3R are closed depending on steering torque of steering wheel. 3. il pressure in the gear housing assembly is the sum of oil pressures occurred in 2R and 3R. This results in a light steering force because of high pressure. uring igh-speed peration SG0020G SG0021G 1. ower steering solenoid valve is opened during high-speed operation. 2. inion 1R, 2R and 3R are closed depending on steering torque of steering wheel. 3. il pressure 2R does not occur because the power steering solenoid valve is on full throttle. 4. il pressure in the gear housing assembly includes only oil pressure occurred in 3R and results in a heavy steering force. ST-6

7 S SYST < SYST SRT > [WTUT RR TV STR] omponent arts ocation : ower steering solenoid valve 2. ower steering control unit. Steering gear assembly. Glove box assembly removed : Vehicle front omponent escription SG0413ZZ : ST omponent parts ower steering control unit Unified meter and / amp. ower steering solenoid valve Reference/unction Signals from various sensors control the driving voltage to the power steering solenoid valve. The power steering control unit controls the driving voltage to the power steering solenoid valve for maintaining the power steering assist force when the fail-safe function is activated. (The engine speed signals control S system if any vehicle speed signal error is detected.) ST-14, "escription" ST-11, "escription" ST-9, "escription" ST-7

8 WR SUY GRU RUT < T/RUT GSS > [WTUT RR TV STR] T/RUT GSS WR SUY GRU RUT escription : ower supply to S system iagnosis rocedure : WR SUY 1. Turn the ignition switch. 2. isconnect power steering control unit harness connector. 3. heck voltage between power steering control unit harness connector and ground. ower steering control unit onnector Terminal Voltage Ground 0 V 4. Turn the ignition switch. UT: ever start the engine. 5. heck voltage between power steering control unit harness connector and ground. ower steering control unit onnector Terminal Voltage Ground attery voltage YS >> G T 2. >> heck the following. f any items are damaged, repair or replace damaged parts. 10 fuses (#45) open - arness for short or open between ignition switch and power steering control unit harness connector o. 3 terminal. - gnition switch. 2. GRU RUT 1. Turn the ignition switch. 2. heck continuity between power steering control unit harness connector and ground. ower steering control unit onnector Terminal ontinuity Ground xisted YS >> G T 3. >> Repair open circuit or short to power in harness or connectors. 3. TRS RSS TRS heck power steering control unit pin terminals for damage or loose connection with harness connector. YS >> ST >> Repair or replace damaged parts. ST-8

9 WR STRG S VV < T/RUT GSS > [WTUT RR TV STR] WR STRG S VV escription ower steering solenoid valve controls the power steering oil pressure in the gear housing assembly. iagnosis rocedure 1. WR STRG S VV SG 1. Turn the ignition switch. 2. heck voltage between power steering control unit harness connector and ground. ower steering control unit onnector Terminal Ground : : YS >> G T 2. >> G T RSS TW WR STRG S VV WR STRG - TR UT 1. Turn the ignition switch. 2. isconnect power steering solenoid valve harness connector. 3. isconnect power steering control unit harness connector. 4. heck the continuity between power steering solenoid valve harness connector and the power steering control unit harness connector. ower steering solenoid valve 1 1 xisted xisted 5. heck continuity between power steering control unit harness connector and ground. YS >> G T 3. >> Repair or replace damaged parts. 3. WR STRG S VV ondition Voltage (pprox.) Vehicle speed: 0 km/h (0 ) (ngine is running) ower steering control unit onnector Terminal onnector Terminal ower steering control unit onnector 108 Terminal 1 5 Vehicle speed: 100 km/h (62 ) ontinuity Ground ot existed ontinuity heck power steering solenoid valve. Refer to ST-10, "omponent nspection". YS >> G T 4. >> Replace gear-sub assembly. Refer to ST-25, "xploded View". 4. TRS RSS TRS V V heck power steering control unit pin terminals for damage or loose connection with harness connector. heck power steering solenoid valve pin terminals for damage or loose connection with harness connector. ST ST-9

10 WR STRG S VV < T/RUT GSS > [WTUT RR TV STR] YS >> ST >> Repair or replace damaged parts. omponent nspection 1. WR STRG S VV 1. Turn the ignition switch. 2. isconnect power steering solenoid valve harness connector. 3. heck resistance between power steering solenoid valve connector terminals. : onnector ower steering solenoid valve Terminal Resistance (pprox.) Ω 4. heck power steering solenoid valve by listening for its operation sound while applying battery voltage to power steering solenoid valve connector 45 terminals 1 (positive) and 2 (negative). YS >> ST >> Replace gear-sub assembly. Refer to ST-25, "xploded View". ST-10

11 G S SG RUT < T/RUT GSS > [WTUT RR TV STR] G S SG RUT escription : sends engine speed signal to power steering control unit. iagnosis rocedure : RR S-GSS 1. Turn the ignition switch. 2. erform self-diagnosis. Refer to -124, "SUT- unction" (VQ35R), -719, "SUT- unction" (V50V). s any T detected? YS >> heck the T. >> G T RSS TW WR STRG TR UT 1. Turn the ignition switch. 2. isconnect harness connectors. 3. isconnect power steering control unit harness connector. 4. heck continuity between harness connector and power steering control unit harness connector. ST 107 (VQ engine) xisted 160 (V engine) heck continuity between power steering control unit harness connector and ground. YS >> G T 3. >> Repair or replace damaged parts. 3. G S SG (1) ower steering control unit onnector Terminal onnector Terminal ower steering control unit onnector Terminal ontinuity Ground ot existed ontinuity 1. onnect harness connectors. 2. heck signal between harness connector and ground with oscilloscope. ST-11

12 G S SG RUT < T/RUT GSS > [WTUT RR TV STR] onnector Terminal ondition Voltage (pprox.) ngine is running Warm-up condition dle speed 107 (VQ engine) 160 (V engine) 110 (VQ engine) 97 (V engine) Ground 0076G ngine is running Warm-up condition ngine speed: pprox. 2,000 rpm 0077G YS >> G T 4. >> Replace. Refer to -23, "T SRV W RG TR UT : escription" (VQ engine), -580, "T SRV W RG TR UT () : escription" (V engine). 4. G S SG (2) 1. Turn the ignition switch. 2. onnect power steering control unit harness connector. 3. heck signal between power steering control unit harness connector and ground with oscilloscope. ower steering control unit onnector Terminal ondition Voltage (pprox.) ngine is running Warm-up condition dle speed Ground 0076G ngine is running Warm-up condition ngine speed: pprox. 2,000 rpm YS >> G T 5. >> Replace power steering control unit. Refer to ST-25, "xploded View". 5. TRS RSS TRS heck power steering control unit pin terminals for damage or loose connection with harness connector. heck pin terminals for damage or loose connection with harness connector. YS >> ST ST G

13 G S SG RUT < T/RUT GSS > [WTUT RR TV STR] >> Repair or replace damaged parts. ST ST-13

14 V S SG RUT < T/RUT GSS > [WTUT RR TV STR] V S SG RUT escription : Unified meter and / amp. sends vehicle speed signal to power steering control unit. iagnosis rocedure : RR U TR /. S-GSS 1. Turn the ignition switch. 2. erform unified meter and / amp. self-diagnosis. Refer to W-45, "SUT- unction (TR/ &)". s any T detected? YS >> heck the T. >> G T RSS TW U TR /. WR STRG TR UT 1. Turn the ignition switch. 2. isconnect unified meter and / amp. harness connector. 3. isconnect power steering control unit harness connector. 4. heck continuity between unified meter and / amp. harness connector and power steering control unit harness connector. Unified meter and / amp. ower steering control unit ontinuity onnector Terminal onnector Terminal xisted 5. heck continuity between power steering control unit harness connector and ground. ower steering control unit onnector Terminal ontinuity Ground ot existed YS >> G T 3. >> Repair or replace damaged parts. 3. V S SG (1) 1. onnect unified meter and / amp. harness connector. 2. heck unified meter and / amp. input/output standard values. Refer to W-93, "Reference Value". YS >> G T 4. >> Replace unified meter and / amp. Refer to W-175, "xploded View". 4. V S SG (2) 1. Turn the ignition switch. 2. onnect power steering control unit harness connector. 3. heck signal between power steering control unit harness connector and ground with oscilloscope. ST-14

15 V S SG RUT < T/RUT GSS > [WTUT RR TV STR] ower steering control unit onnector Terminal Ground ondition Voltage (pprox.) Vehicle speed: 40 km/h (25 ) UT: heck air pressure of tire under standard condition. T: The maximum voltage varies depending on the specification (destination unit). YS >> G T 5. >> Replace power steering control unit. Refer to ST-25, "xploded View". 5. TRS RSS TRS S0015G heck power steering control unit pin terminals for damage or loose connection with harness connector. heck unified meter and / amp. pin terminals for damage or loose connection with harness connector. YS >> ST >> Repair or replace damaged parts. ST ST-15

16 WR STRG TR UT < U GSS RT > [WTUT RR TV STR] U GSS RT WR STRG TR UT Reference Value TR YUT : YS VUS SG0023ZZ Terminal o. (Wire color) escription + - Signal name 1 (G) 3 (G) 5 () 6 () 8 () Ground Ground Ground ower steering solenoid valve voltage gnition switch power supply ower steering solenoid valve ground nput/ utput utput nput ondition Vehicle speed: 0 km/h (0 ) (ngine is running) Vehicle speed: 100 km/h (62 ) gnition switch: gnition switch: Value (pprox.) V V attery voltage 0 V lways 0 V Ground Ground lways 0 V Ground Vehicle speed signal nput Vehicle speed: 40 km/h (25 ) UT: heck air pressure of tire under standard condition. T: The maximum voltage varies depending on the specification (destination unit). S0015G ST-16

17 WR STRG TR UT < U GSS RT > [WTUT RR TV STR] Terminal o. (Wire color) escription + - Signal name nput/ utput ondition Value (pprox.) ngine is running Warm-up condition dle speed 10 (R) Ground ngine speed signal nput 0076G ngine is running Warm-up condition ngine speed: pprox. 2,000 rpm 0077G UT: When using circuit tester or oscilloscope to measure voltage for inspection, be sure not to forcibly extend any connector terminals. ST ST-17

18 WR STRG TR UT < U GSS RT > [WTUT RR TV STR] Wiring iagram - TRY TR WR STRG SYST - : GW0104G ST-18

19 WR STRG TR UT < U GSS RT > [WTUT RR TV STR] ST GW0105G ST-19

20 WR STRG TR UT < U GSS RT > [WTUT RR TV STR] ail-safe GW0106G : S system ST-20

21 WR STRG TR UT < U GSS RT > [WTUT RR TV STR] S system enters the fail-safe mode (that allows the steering force to be controlled without impairing the drivability) if any of the input/output values to/from S system (power steering control unit) deviate from the standard range. T: The system enters the fail-safe mode if the engine speed remains at 1,500 rpm or more for over 10 seconds while the vehicle is stopped. This is normal. The fail-safe function is canceled when a vehicle speed signal of 2 km/h (1.2 ) or more is inputted or the ignition switch is turned. S system restores the normal operation at that time. ode Warning lamp T etection point (malfunction part) rror area and root cause ail-safe Vehicle speed signal input SG0368G ngine speed is 1,500 rpm or more and there is no vehicle speed signal input for over 10 seconds during vehicle travel. Vehicle speed signal has abruptly dropped from 30 km/h (19 ) or more to 2 km/h (1.2 ) or less within 1.4 seconds. ST ST-21

22 U STRG W TURG R (TRQU VRT) < SYT GSS > [WTUT RR TV STR] SYT GSS U STRG W TURG R (TRQU VR- T) escription : ard steering when fully turning the steering wheel. ight steering when driving at a high speed. iagnosis rocedure : SYST R WR SUY GRU erform trouble diagnosis for power supply and ground. Refer to ST-8, "iagnosis rocedure". YS >> G T 2. >> Repair or replace damaged parts. 2. SYST R V S SG erform trouble diagnosis for vehicle speed signal. Refer to ST-14, "iagnosis rocedure". YS >> G T 3. >> Repair or replace damaged parts. 3. SYST R G S SG erform trouble diagnosis for engine speed signal. Refer to ST-11, "iagnosis rocedure". YS >> G T 4. >> Repair or replace damaged parts. 4. SYST R WR STRG S VV erform trouble diagnosis for power steering solenoid valve. Refer to ST-9, "iagnosis rocedure". YS >> erform the symptom diagnosis for the steering system. Refer to ST-3, "V Troubleshooting hart". >> Repair or replace damaged parts. ST-22

23 RUTS < RUT > [WTUT RR TV STR] RUT RUTS recaution for Supplemental Restraint System (SRS) "R G" and "ST T R-TSR" : The Supplemental Restraint System such as R G and ST T R-TSR, 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. nformation necessary to service the system safely is included in the SRS R G and ST T of this Service anual. WRG: 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 SS/T dealer. mproper maintenance, including incorrect removal and installation of the SRS, can lead to personal injury caused by unintentional activation of the system. or removal of Spiral able and ir ag odule, see the SRS R G. o not use electrical test equipment on any circuit related to the SRS unless instructed to in this Service anual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or harness connectors. RUTS W USG WR TS (R R TR) RS WRG: When working near the ir ag iagnosis Sensor Unit or other ir ag System sensors with the ignition or engine running, T use air or electric power tools or strike near the sensor(s) with a hammer. eavy 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, disconnect the battery, and wait at least 3 minutes before performing any service. recaution ecessary for Steering Wheel Rotation after attery isconnect : T: efore removing and installing any control units, first turn the push-button ignition switch to the position, then disconnect both battery cables. fter finishing work, confirm that all control unit connectors are connected properly, then re-connect both battery cables. lways use SUT- to perform self-diagnosis as a part of each function inspection after finishing work. f a T is detected, perform trouble diagnosis according to self-diagnosis results. This vehicle is equipped with a push-button ignition switch and a steering lock unit. f the battery is disconnected or discharged, the steering wheel will lock and cannot be turned. f turning the steering wheel is required with the battery disconnected or discharged, follow the procedure below before starting the repair operation. RT RUR 1. onnect both battery cables. T: Supply power using jumper cables if battery is discharged. 2. Turn the push-button ignition switch to position. (t this time, the steering lock will be released.) 3. isconnect both battery cables. The steering lock will remain released with both battery cables disconnected and the steering wheel can be turned. 4. erform the necessary repair operation. ST ST-23

24 RUTS < RUT > [WTUT RR TV STR] 5. When the repair work is completed, re-connect both battery cables. With the brake pedal released, turn the push-button ignition switch from position to position, then to position. (The steering wheel will lock when the push-button ignition switch is turned to position.) 6. erform self-diagnosis check of all control units using SUT-. ST-24

25 WR STRG TR UT < RV STT > [WTUT RR TV STR] RV STT WR STRG TR UT xploded View : ST 1. ower steering control unit : Vehicle front Removal and nstallation RV 1. Remove instrument lower cover. Refer to -11, "xploded View". 2. Remove instrument lower panel R. Refer to -11, "xploded View". 3. Remove power steering control unit screws. 4. Remove power steering control unit (1). 5. isconnect power steering control unit connector. SG0129ZZ : STT nstall in the reverse order of removal. SG0130ZZ ST-25

26 GSS RR WRW < S ST > [WT RR TV STR] S ST GSS RR WRW Work low T W 1.TRVW R T USTR : t is also important to clarify customer complaints before inspection. irst of all, reproduce symptoms, and understand them fully. sk customer about his/her complaints carefully. n some cases, it is necessary to check symptoms by driving vehicle with customer. UT: ustomers are not professional. t is dangerous to make an easy guess like maybe the customer means that..., or maybe the customer mentions this symptom. >> G T SYT Start the engine. UT: Stop the vehicle. oes RS warning lamp turn? YS >> G T 3. >> G T 5. 3.RR S-GSS erform RS control unit self-diagnosis. s any T detected? YS >> G T 4. >> G T 5. 4.RR TRU GSS 1. heck the error system detected from the self-diagnosis. UT: heck the T TR value of each T detected with the self-diagnosis function. 2. rase RS control unit self-diagnosis memory. UT: ever erase the self-diagnosis result (record) history when replacing RS control unit. rase the memory of the self-diagnosis results (record) after printing out or recording all the values of T TR. >> G T TR heck each harness connector pin terminal for disconnection. >> G T SYT RRUT erform T reproduction procedure for the error system. s any T detected? YS >> G T 2. >> G T 7. ST-26

27 GSS RR WRW < S ST > [WT RR TV STR] 7.RR SYT GSS erform the symptom diagnosis for each system. s any error detected? YS >> G T 2. >> G T heck input/output signal standard of RS control unit. s the input/output the standard value? YS >> ST >> G T 2. ST ST-27

28 RS SYST < SYST SRT > [WT RR TV STR] SYST SRT RS SYST System iagram TR GR : SG0414G RSS-ST VW RS ctuator SG Rod 2. ffset shaft 3. Gear housing assembly 4. RS motor 5. otor shaft 6. Rear wheel steering angle sensor 7. R gear System escription : SRT RS control unit controls the rear active steer. RS system consists of RS control unit and RS actuator components. RS control unit controls the RS actuator assembly according to the steering angle and vehicle speed. Self-diagnosis can be performed with SUT- at each control unit to another RS control unit. ST-28

29 RS SYST < SYST SRT > [WT RR TV STR] t transmits/receives each signal from the following control unit via communication line. omponent parts Steering angle sensor S actuator and electronic unit (control unit) Unified meter and / amp. odel ollowing ontrol Situation : The rear wheels turn to the opposite phase of front wheels for a moment so as to improve the start-up of yaw rate (steering angle speed). Situation : The rear wheels turn to the same phase of front wheels after securing the necessary yaw rate (steering angle speed) to cornering. unction t mainly transmits the following signals to RS control unit via communication. Steering angle sensor signal t mainly transmits the following signals to RS control unit via communication. Vehicle speed signal V malfunction signal t mainly transmits the following signals to RS control unit via communication. ngine speed signal t mainly transmits the following signals from RS control unit via communication. RS warning lamp signal ST RT SRT The rear wheel angle changes as per the following: uring high-speed driving The rear wheels turn to the same phase of front wheels regardless of the operation speed of steering wheel. SG1439 SG1440 uring middle- low-speed driving When turning the steering wheel rapidly, the rear wheels turn to the opposite phase of front wheels for a moment just after starting the steering wheel operation. nd then, they turn to the same phase. SG1441 ST-29

30 RS SYST < SYST SRT > [WT RR TV STR] The rear wheels turn to the same phase of front wheels when turning the steering wheel slowly. SG1442 uring extremely slow-speed driving and at straight-ahead driving The rear wheels do not turn during extremely slow-speed driving regardless of the operation speed of steering wheel. The rear wheels do not turn at straight-ahead driving regardless of the vehicle speed. RT TUR RS TUTR t is driven by RS motor. The irreversible efficiency performance hypoid gear secures the toe-stiffness of rear wheels against the road external force and keep the steering angle when system is malfunction. The power from the pinion gear (motor side) is transmitted, but the pinion gear does not rotate as caused by the gear mechanical characteristics (teeth angle) even though the ring gear (tire side) starts to rotate. omponent arts ocation : SG0422ZZ 1. RS control unit 2. RS motor relay 3. oise suppressor 4. RS warning lamp 5. RS rear motor 6. RS rear actuator 7. Rear wheel steering angle sensor. nside the rear wheel house finisher (left). nside combination meter. RS rear actuator assembly ST-30

31 RS SYST < SYST SRT > [WT RR TV STR] omponent escription : omponent parts Steering angle sensor RS control unit RS actuator Rear wheel steering angle sensor RS motor S actuator and electronic unit (control unit) ower steering solenoid valve RS warning lamp Stop lamp switch Reference/unction ST-64, "escription" ST-38, "escription" The rear wheel steering angle is activated. ST-53, "escription" ST-40, "escription" ST-62, "escription" ST-66, "escription" ST-82, "escription" ST-84, "escription" The stop lamp switch condition is detected. ST ST-31

32 S SYST < SYST SRT > [WT RR TV STR] S SYST System iagram TR GR : RSS-ST VW SG0416G SG0376ZZ 1. Unified meter and / amp. 2. RS control unit 3. ower steering solenoid valve 4. Steering gear assembly 5. Gear housing assembly 6. Gear sub-assembly 7. inion 8. ower steering oil pump 9. Reservoir tank System escription The S system controls the power steering solenoid valve through the RS control unit. : ST-32

33 S SYST < SYST SRT > [WT RR TV STR] The valve driving voltage to control the power steering solenoid valve varies according to the vehicle speed. RT R uring arking (When Turning The Steering Wheel To The Right.) SG0451G ST 1. ower steering solenoid valve is closed while a vehicle is stopped. 2. inion 1R, 2R and 3R are closed depending on steering torque of steering wheel. 3. il pressure in the gear housing assembly is the sum of oil pressures occurred in 2R and 3R. This results in a light steering force because of high pressure. uring igh-speed peration SG1583 SG ower steering solenoid valve is opened during high-speed operation. 2. inion 1R, 2R and 3R are closed depending on steering torque of steering wheel. 3. il pressure 2R does not occur because the power steering solenoid valve is on full throttle. 4. il pressure in the gear housing assembly includes only oil pressure occurred in 3R and results in a heavy steering force. ST-33

34 S SYST < SYST SRT > [WT RR TV STR] omponent arts ocation : SG0423ZZ 1. ower steering solenoid valve 2. RS control unit 3. RS motor relay 4. oise suppressor. Steering gear assembly. nside the rear wheel house finisher (eft) : Vehicle front omponent escription : RS control unit omponent parts S actuator and electric unit (control unit) ower steering solenoid valve Reference/unction The power steering solenoid valve activation voltage is controlled by each sensor signal. The power steering solenoid valve activation voltage is controlled by RS control unit for maintaining the power steering force in the fail-safe mode. (S system is controlled by the engine speed signal if the vehicle speed signal error is detected.) ST-62, "escription" ST-66, "escription" ST-82, "escription" ST-34

35 GSS SYST (RS TR UT) < SYST SRT > [WT RR TV STR] GSS SYST (RS TR UT) iagnosis escription : SRT The RS warning lamp in the combination meter will flicker according to the self-diagnostic results. s for the details of the RS warning lamp flickering patterns. GST RUR 1. Start the engine. 2. erform the following procedure within 10 seconds after engine start. Turn steering wheel left and right at 20 or more and 5 times epress the brake pedal 5 times or more 3. Read the flickering of RS warning lamp. T: When the RS warning lamp flashes 4 z and continues repeating it, the system is normal. UGT S-GSS When a malfunction is detected, the malfunction route is indicated by flickering of the RS warning lamp. ST T: When the RS warning lamp flashes 4 z and continues repeating it, the system is normal. lickering pattern SG1453 isplay items alfunction detected condition heck item 11 RS control unit alfunction has occurred inside RS control unit. ST-38, ST-44 or ST otor power supply attery voltage circuit malfunction of RS motor ST otor output 21 Vehicle speed signal 22 Steering angle sensor signal Rear wheel steering angle (main) Rear wheel steering angle (sub) When the RS motor current value is 10 or more, actual output is excessively low and the condition continues for some time. alfunction is detected in vehicle speed signal that is output from S actuator and electric unit (control unit) via communication. mproper signal is input vehicle speed. alfunction is detected in steering angle sensor signal that is output from steering angle sensor via communication. mproper signal is input steering angle sensor. The rear wheel steering angle sensor (main) output signal is malfunctioning. The rear wheel steering angle sensor (main) power supply value is malfunction. The output signal value differs between rear wheel steering angle sensor (main) and (sub). The rear wheel steering angle sensor (sub) output signal is malfunctioning. The rear wheel steering angle sensor (sub) power supply value is malfunction. The output signal value differs between rear wheel steering angle sensor (main) and (sub). ST-40 ST-62 ST-64, ST-68, ST-70 or ST-72 ST-53, ST-56 or ST-59 ST-53, ST-56 or ST-59 ST-35

36 GSS SYST (RS TR UT) < SYST SRT > [WT RR TV STR] lickering pattern isplay items alfunction detected condition heck item 26 V 33 ngine speed signal alfunction is detected in V malfunction signal that is output from S actuator and electric unit (control unit) via communication. S actuator and electric unit (control unit) outputs the malfunction signal. mproper signal is input V malfunction signal. alfunction is detected in engine speed signal that is output from via communication. mproper signal is input engine speed. ST-74 ST-66 o flickering Stop lamp switch Stop lamp switch circuit is shorted or open. ST-86 RS S-GSS n order to make it easier to find the cause of hard-to-duplicate malfunctions, malfunction information is stored into the control unit as necessary during use by the user. This memory is not erased no matter how many times the ignition switch is turned and. owever, this information is erased or by erasing the memory using the SUT-. SUT- unction UT SUT- can display each diagnostic item using the diagnostic test modes shown below. : iagnostic test mode U identification Self-diagnostic results ata monitor ctive test unction RS control unit part number can be read. Self-diagnostic results can be read and erased quickly. nput/utput data in the RS control unit can be read. iagnostic Test ode in which SUT- drives some actuators apart from the RS control unit and also shifts some parameters in a specified range. S-G RSUT isplay tem ist Refer to ST-98, "T ndex". T TR isplay tem ist onitor item (Unit) V S S [km/h] or [mph] STRG G [ ] G S [rpm] WR STR S [] RR ST G- [V] RR ST G-SU [V] RR ST G-V [V] /U VTG [V] TR VTG [V] TR URRT [] TR RT [] RR G [ ] Remarks The vehicle speed signal from S actuator and electric unit (control unit) is indicated via communication line. The steering angle sensor signal from the steering angle sensor is indicated via communication line. The engine speed signal from is indicated via communication line. The current value of the power steering solenoid valve is indicated. The voltage of the rear wheel steering angle sensor (main) is indicated. The voltage of the rear wheel steering angle sensor (sub) is indicated. The power supply voltage of the rear wheel steering angle sensor is indicated. The power supply voltage value of RS control unit is indicated. The voltage value of RS motor is indicated. The current value of RS motor is indicated. The current value input to RS motor is indicated. The angle command value is indicated for activating RS motor. ST-36

37 GSS SYST (RS TR UT) < SYST SRT > [WT RR TV STR] onitor item (Unit) ST SW [n/ff] S RY [n/ff] S [n/ff] WRG [n/ff] TV TST escription RS actuator assembly activation is checked according to the control signal from SUT-. The control signal forcibly activates (/) RS actuator assembly, performs the self-diagnosis and checks each sensor in S GST. UT: erform the active test while the vehicle is stopped. Standard value onitor item Remarks The stop lamp switch status is indicated. RS motor relay condition is indicated. The fail-safe mode status of RS control unit is indicated. RS warning lamp / condition is indicated. Select test item ontrol signal Remarks S GST UT: erform the active test while the vehicle is stopped. ctive test RS actuator assembly activates. t activates in the same direction as the steering angle by inputting the steering angle. RS actuator assembly stops the activation. STRG G 0 (eutral) R RR ST G- 2.4 V pprox. 4.4 V pprox. 0.4 V RR ST G-SU 2.4 V pprox. 4.4 V pprox. 0.4 V TR URRT o output (pprox. 0 ) utput (change) ST ST-37

38 1900, 1901, 1906, 1907, 1927 RS TR UT < T/RUT GSS > [WT RR TV STR] T/RUT GSS 1900, 1901, 1906, 1907, 1927 RS TR UT escription : RS actuator and the power steering solenoid valve is controlled by each sensor signal. The fail-safe function stops the rear wheel angle function, when the electric components and the mechanical components are malfunctioning. The protective function stops RS system temporarily when the input signal is not inputted to RS control unit (When battery-power dose not work temporarily). T ogic T TT G : T isplay tems alfunction detected condition ossible cause TR UT [R1] TR UT [R2] TR UT [R5] TR UT [R4] TR UT [R5] T RT RUR alfunction has occurred inside RS control unit. alfunction has occurred inside RS control unit. alfunction has occurred inside RS control unit. alfunction has occurred inside RS control unit. alfunction has occurred inside RS control unit. RS control unit arness or connector RS control unit arness or connector RS control unit arness or connector RS control unit arness or connector RS control unit arness or connector 1.T RRUT RUR 1. Turn the ignition switch from to. 2. erform RS control unit self-diagnosis. Without SUT- 1. Start the engine. 2. erform the self-diagnosis. Refer to ST-35, "iagnosis escription". s T 1900, 1901, 1906, 1907, 1927 or RS warning lamp flickering pattern:11 detected? YS >> roceed to diagnosis procedure. Refer to ST-38, "iagnosis rocedure". >> ST iagnosis rocedure 1.RR S-GSS : Turn the ignition switch from to. 2. erform RS control unit self-diagnosis. Without SUT- 1. Start the engine. 2. erform the self-diagnosis. Refer to ST-35, "iagnosis escription". s T 1900, 1901, 1906, 1907, 1927 or RS warning lamp flickering pattern:11 detected? YS >> Replace RS control unit. Refer to ST-106, "xploded View". >> G T RT ST-38

39 1900, 1901, 1906, 1907, 1927 RS TR UT < T/RUT GSS > [WT RR TV STR] heck the T TR value of each T detected with the self-diagnosis function. Refer to ST-88, "Reference Value". s each data the standard value? YS >> heck each harness connector pin terminal for disconnection. >> Replace RS control unit. Refer to ST-106, "xploded View". Special Repair Requirement : R RG RS TR UT Record the self-diagnosis results (history). UT: ever erase the memory (history) of self-diagnosis results when replacing RS control unit after diagnosis. rase the memory of the self-diagnosis results (record) after printing out or recording all the values of T TR. ST ST-39

40 1902, 1903, 1904, 1910, 1913 RS TR UTUT < T/RUT GSS > [WT RR TV STR] 1902, 1903, 1904, 1910, 1913 RS TR UTUT escription : RS motor activates RS actuator. aintain the toe-stiffness of rear wheels against the road external force because the irreversible sufficiency performance hypoid gear is used. T ogic T TT G : T isplay items alfunction detected condition ossible cause TR UTUT [RV URRT] TR UTUT [ URRT] TR UTUT [VRURRT] TR UTUT [TR ] TR UTUT [R SG] T RT RUR RS motor current error is detected. (RS motor current output direction differs.) RS motor current error is detected. (urrent is inputted to RS control unit if RS control unit output is.) RS motor current error is detected. (RS motor output is over current.) RS motor inside error is detected. (RS motor does not move or the rear wheel angle sensor does not change if RS control unit output is 14 or more.) RS motor current error is detected. (RS motor does not move or the rear wheel angle sensor output does not change when RS control unit output is 18 or more, and RS motor output is low.) RS motor arness or connector RS control unit RS motor arness or connector RS control unit RS motor arness or connector RS control unit RS motor arness or connector RS control unit RS motor arness or connector RS control unit 1.T RRUT RUR 1. erform S GST item on TV TST of RS control unit. UT: erform the active test while vehicle is stopped. 2. erform RS control unit self-diagnosis. Without SUT- 1. Start the engine. 2. erform the self-diagnosis. Refer to ST-35, "iagnosis escription". s T 1902, 1903, 1904, 1910, 1913 or RS warning lamp flickering pattern:13 detected? YS >> roceed to diagnosis procedure. Refer to ST-40, "iagnosis rocedure". >> ST iagnosis rocedure 1. RS TR RUT : Turn the ignition switch. 2. isconnect RS control unit harness connector. 3. isconnect RS motor harness connector. 4. heck the continuity between RS control unit harness connector and RS motor harness connector. ST-40

41 1902, 1903, 1904, 1910, 1913 RS TR UTUT < T/RUT GSS > [WT RR TV STR] RS control unit RS motor onnector Terminal onnector Terminal heck the continuity between RS control unit harness connector and ground. onnector 37 RS control unit Terminal ontinuity Ground YS >> G T 2. >> Repair or replace the harnesses and connectors. 2. RS TR ot existed heck RS motor. Refer to ST-42, "omponent nspection". YS >> G T 3. >> Replace RS actuator assembly. Refer to ST-107, "xploded View". 3.RR TV TST 1. onnect RS control unit harness connector. 2. onnect RS motor harness connector. 3. erform S GST item on TV TST of RS control unit. UT: erform the active test while vehicle is stopped. 4. heck TR VTG, TR URRT and TR RT while performing the active test. onitor item ondition isplay value TR VTG gnition switch: attery voltage TR URRT RS motor running 0 20 TR RT RS actuator neutral condition and vehicle straight-ahead position RS motor running pprox. 2 2 pprox Without SUT- 1. isconnect RS control unit harness connector. 2. isconnect RS motor harness connector. 3. Start the engine. 4. heck the voltage between RS control unit harness connector and ground. ontinuity xisted ST ST-41

42 1902, 1903, 1904, 1910, 1913 RS TR UTUT < T/RUT GSS > [WT RR TV STR] onnector 37 RS control unit s the standard value? YS >> G T 4. >> Replace RS actuator assembly. Refer to ST-107, "xploded View". 4.RR S-GSS 1. Turn the ignition switch. 2. erform RS control unit self-diagnosis. Without SUT- 1. onnect RS control unit harness connector. 2. onnect RS motor harness connector. 3. Start the engine. 4. erform the self-diagnosis. Refer to ST-35, "iagnosis escription". s T 1902, 1903, 1904, 1910 or RS warning lamp flickering pattern:13 detected? YS >> Replace RS control unit. Refer to ST-106, "xploded View". >> G T RT heck the T TR value of each T detected with the self-diagnosis function. Refer to ST-88, "Reference Value". s each data the standard value? YS >> heck each harness connector pin terminal for disconnection. >> Replace RS control unit. Refer to ST-106, "xploded View". omponent nspection 1. RS TR Terminal heck the continuity between RS motor connector terminals. ondition Voltage (pprox.) Ground While RS motor is operation for right While RS motor is operation for left While RS motor is operation for right While RS motor is operation for left attery voltage 0V 0V attery voltage : RS motor ontinuity onnector Terminal xisted YS >> ST >> Replace RS actuator assembly. Refer to ST-107, "xploded View". Special Repair Requirement : R RG RS TR UT Record the self-diagnosis results (history). UT: ever erase the memory (history) of self-diagnosis results when replacing RS control unit after diagnosis. ST-42

43 1902, 1903, 1904, 1910, 1913 RS TR UTUT < T/RUT GSS > [WT RR TV STR] rase the memory of the self-diagnosis results (record) after printing out or recording all the values of T TR. ST ST-43

44 1905, 1908, 1922, 1925, 1928 RS TR UT < T/RUT GSS > [WT RR TV STR] 1905, 1908, 1922, 1925, 1928 RS TR UT escription : RS actuator and the power steering solenoid valve is controlled by each sensor signal. The fail-safe function stops the rear wheel angle function, when the electric components and the mechanical components are malfunctioning. The protective function stops RS system temporarily when the input signal is not inputted to RS control unit (When battery-power dose not work temporarily). T ogic T TT G : T isplay items alfunction detected condition ossible cause TR UT [R3] TR UT [R7] TR UT [R8] T RT RUR alfunction has occurred inside RS control unit. alfunction has occurred inside RS control unit. alfunction has occurred inside RS control unit VRTR alfunction has occurred inside RS control unit TR UT [R9] alfunction has occurred inside RS control unit. RS control unit arness or connector RS control unit arness or connector RS control unit arness or connector RS control unit arness or connector RS control unit arness or connector 1.T RRUT RUR 1. Turn the ignition switch from to. 2. erform RS control unit self-diagnosis. Without SUT- 1. Start the engine. 2. erform the self-diagnosis. Refer to ST-35, "iagnosis escription". s T 1905, 1908, 1922, 1925, 1928 or RS warning lamp flickering pattern:11 detected? YS >> roceed to diagnosis procedure. Refer to ST-44, "iagnosis rocedure". >> ST iagnosis rocedure 1.RR S-GSS : Turn the ignition switch from to. 2. erform RS control unit self-diagnosis. Without SUT- 1. Start the engine. 2. erform the self-diagnosis. Refer to ST-35, "iagnosis escription". s T 1905, 1908, 1922, 1925, 1928 or RS warning lamp flickering pattern:11 detected? YS >> Replace RS control unit. Refer to ST-106, "xploded View". >> G T RT heck the T TR value of each T detected with the self-diagnosis function. Refer to ST-88, "Reference Value". ST-44

45 1905, 1908, 1922, 1925, 1928 RS TR UT < T/RUT GSS > [WT RR TV STR] s each data the standard value? YS >> heck each harness connector pin terminal for disconnection. >> Replace RS control unit. Refer to ST-106, "xploded View". Special Repair Requirement : R RG RS TR UT Record the self-diagnosis results (history). UT: ever erase the memory (history) of self-diagnosis results when replacing RS control unit after diagnosis. rase the memory of the self-diagnosis results (record) after printing out or recording all the values of T TR. ST ST-45

46 1909 RS TR UT < T/RUT GSS > [WT RR TV STR] 1909 RS TR UT escription : RS actuator and the power steering solenoid valve is controlled by each sensor signal. The fail-safe function stops the rear wheel angle function, when the electric components and the mechanical components are malfunctioning. The protective function stops RS system temporarily when the input signal is not inputted to RS control unit (When battery-power dose not work temporarily). T ogic T TT G : T isplay items alfunction detected condition ossible cause 1909 TR UT [R6] T RT RUR alfunction has occurred inside RS control unit. RS control unit arness or connector 1.T RRUT RUR 1. Turn the ignition switch from to. 2. erform RS control unit self-diagnosis. Without SUT- 1. Start the engine. 2. erform the self-diagnosis. Refer to ST-35, "iagnosis escription". s T 1909 or RS warning lamp flickering pattern:11 detected? YS >> roceed to diagnosis procedure. Refer to ST-46, "iagnosis rocedure". >> ST iagnosis rocedure : RS TR UT WR SUY 1. Turn the ignition switch. 2. isconnect RS control unit harness connector. 3. heck the voltage between RS control unit harness connector terminal and ground. onnector RS control unit Terminal Voltage (pprox.) Ground 0 V 4. Turn the ignition switch. UT: ever start the engine. 5. heck the voltage between RS control unit harness connector terminal and ground. onnector RS control unit Terminal Voltage (pprox.) Ground attery voltage YS >> G T 2. G >> heck the following items. Repair or replace the malfunctioning parts. 10 fuse (#45) open - Short among 10 fuse (#45) connector, RS control unit harness connector o. 27 terminal and the ground ST-46

47 1909 RS TR UT < T/RUT GSS > [WT RR TV STR] pen between the ignition switch and RS control unit harness connector o. 27 terminal gnition switch 2. RS TR UT GRU heck the continuity between RS control unit harness connector and ground. onnector RS control unit Terminal YS >> G T 3. G >> Repair or replace the harnesses and connectors. 3.RR S-GSS 1. onnect RS control unit harness connector. 2. Turn the ignition switch from to. 3. erform RS control unit self-diagnosis. Without SUT- 1. onnect RS control unit harness connector. 2. Start the engine. 3. erform the self-diagnosis. Refer to ST-35, "iagnosis escription". s T 1909 or RS warning lamp flickering pattern:11 detected? YS >> Replace RS control unit. Refer to ST-106, "xploded View". >> G T RT heck the T TR value of each T detected with the self-diagnosis function. Refer to ST-88, "Reference Value". s each data the standard value? YS >> heck each harness connector pin terminal for disconnection. >> Replace RS control unit. Refer to ST-106, "xploded View". Special Repair Requirement ontinuity Ground xisted : R RG RS TR UT Record the self-diagnosis results (history). UT: ever erase the memory (history) of self-diagnosis results when replacing RS control unit after diagnosis. rase the memory of the self-diagnosis results (record) after printing out or recording all the values of T TR. ST ST-47