STEERING CONTROL SYSTEM

Transcription

1 STRG ST STRG TR SYST TTS RUT... 3 RUTS... 3 recaution for Supplemental Restraint System (SRS) "R G" and "ST T R-T- SR"...3 Service otice and recautions for S System...3 RRT... 4 RRT... 4 ommercial Service Tools...4 SYST SRT... 5 T RTS... 5 omponent arts ocation...5 omponent escription...6 S ontrol Unit...6 S otor, Torque Sensor, Reduction Gear...6 SYST... 8 S SYST...8 S SYST : System escription...8 S SYST : ail-safe...9 S SYST : rotection unction...9 WRG/TR/ ST...9 WRG/TR/ ST : Warning amp/ndicator amp...9 GSS SYST (S TR UT)...10 SUT unction...10 U GSS RT...12 S TR UT...12 Reference Value...12 ail-safe...13 rotection unction...13 T nspection riority hart...14 T ndex...14 WRG GR...15 WR STRG TR SYST...15 Wiring iagram...15 S ST...19 GSS RR WRW...19 Work low...19 iagnostic Work Sheet...20 T/RUT GSS TTRY WR SUY...22 T ogic...22 iagnosis rocedure TRQU SSR...25 T ogic...25 iagnosis rocedure S TR...27 T ogic...27 iagnosis rocedure , 1608 S TR UT...28 T ogic...28 iagnosis rocedure V S SG...29 T ogic...29 iagnosis rocedure...29 U1000 RUT...30 escription...30 T ogic...30 iagnosis rocedure...30 S WRG...31 omponent unction heck...31 iagnosis rocedure

2 SYT GSS S WRG S T TUR escription iagnosis rocedure S WRG S T TUR escription iagnosis rocedure STRG W TURG R S VY R GT escription iagnosis rocedure U STRG W TURG R RTUR TW RGT T escription iagnosis rocedure U STRG W TURG R (TRQU VRT) escription iagnosis rocedure RV STT S TR UT xploded View Removal and nstallation

3 < RUT > RUT RUTS 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. nformation necessary to service the system safely is included in the SR and S section 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 SR section. 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 irbag iagnosis Sensor Unit or other irbag System sensors with the gnition 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 gnition, disconnect the battery and wait at least three minutes before performing any service. Service otice and recautions for S System : heck the following item when performing the trouble diagnosis. - heck any possible causes by interviewing the symptom and it s condition from the customer if any malfunction, such as S warning lamp is turned, occurs. - heck if air pressure and size of tires are proper, the specified part is used for the steering wheel, and control unit is genuine part. - heck 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.). - heck if the wheel alignment is adjusted properly. - heck if there is any damage or modification to suspension or body resulting in increased weight or altered ground clearance. - heck if installation conditions of each link and suspension are proper. - heck if the battery voltage is proper. - heck connection conditions of each connector are proper. - efore connecting or disconnecting the S control unit harness connector, turn ignition switch and disconnect battery ground cable. ecause battery voltage is applied to S control unit even if ignition switch is turned. uring quick steering, rasping noise may be heard from around the steering wheel. This is not a malfunction. The noise is an operating noise of the S system under normal conditions. f the rasping noise occurs during slow steering, this may not be an operating noise of the system. n this case, it is necessary to find out the location of the noise and repair, if necessary. -3

4 < RRT > RRT RRT ommercial Service Tools RRT : Tool name ower tool escription oosening nuts, screws and bolts

5 < SYST SRT > SYST SRT T RTS omponent arts ocation T RTS : G0158ZZ -5

6 < SYST SRT > 1. S control unit (view with steering column removed from vehicle) 4. S actuator and electric unit (control unit) 7. Steering angle sensor (view with steering wheel removed) omponent escription T RTS 2. S motor (view with steering column removed from vehicle) 3. Torque sensor (view with steering column removed from vehicle) S warning lamp (n combination meter) : omponents parts S control unit S motor Torque sensor Reduction gear S warning lamp S actuator and electric unit (control unit) ombination meter S ontrol Unit -6, "S ontrol Unit" Reference -6, "S otor, Torque Sensor, Reduction Gear" -6, "S otor, Torque Sensor, Reduction Gear" -6, "S otor, Torque Sensor, Reduction Gear" -9, "WRG/TR/ ST : Warning amp/ ndicator amp" Transmits mainly the following signals to S control unit via communication. - ngine status signal Transmits mainly the following signal to S control unit via communication. - Vehicle speed signal (S) Transmits mainly the following signal to S control unit via communication. - Vehicle speed signal (TR) Turns the S warning lamp according to the signal from S control unit via communication. : S control unit (1) is installed to steering column assembly. S control unit performs an arithmetical operation on data, such as steering wheel turning force (sensor signal) from the torque sensor, vehicle speed signal, etc. Then it generates an optimum assist torque signal to the S motor according to the driving condition. S control unit decreases the output signal to S motor while extremely using the power steering function (e.g., full steering) consecutively for protecting S motor and S control unit (verload protection control). S otor, Torque Sensor, Reduction Gear SG0957ZZ : S motor (1), torque sensor (2) and reduction gear (3) are installed to steering column assembly. S TR -6 SG0958ZZ

7 < SYST SRT > T RTS S motor provides the assist torque by the control signal from S control unit. TRQU SSR Torque sensor detects the steering torque, and transmits the signal to S control unit. RUT GR Reduction gear increases the assist torque provided from S motor with worm gears, and outputs to the column shaft. -7

8 < SYST SRT > SYST S SYST S SYST : System escription SYST GR SYST : SG1097G SRT S control unit performs an arithmetical operation on data, such as steering wheel turning force (sensor signal) from the torque sensor, vehicle speed signal, etc. Then it generates an optimum assist torque signal to the S motor according to the driving condition. n case of a malfunction in the electrical system, the fail-safe function stops output signals to the S motor. Refer to -9, "S SYST : ail-safe". S control unit decreases the output signal to S motor while extremely using the power steering function (e.g., full steering) consecutively for protecting S motor and S control unit (verload protection control). Refer to -13, "rotection unction". xtensive steering at low speed will cause the S control unit and S motor to heat up, once temperature reaches critical point S control unit will reduce current to reduce heat up. System will recover as temperature lowers (reduced or no assistance). SG0832G S WRG T Turn when there is a malfunction in S system. f indicates that fail-safe mode is engaged and enters a manual steering state (ontrol turning force steering wheel becomes heavy). lso turns when ignition switch is turned, for purpose of lamp check. Turns after the engine starts, if system is normal. ondition gnition switch. (amp check) ngine running. S system malfunction [ther diagnostic item] UT: -8 S warning lamp

9 < SYST SRT > SYST S warning lamp also turns due to data reception error, communication error etc. S SYST : ail-safe : f any malfunction occurs in the system and control unit detects the malfunction, S warning lamp on combination meter turns to indicate system malfunction. When S warning lamp is, the system enters into a manual steering state. (ontrol turning force steering wheel becomes heavy.) Under abnormal vehicle speed signal conditions, vehicle speed is judged as constant. S SYST : rotection unction : S control unit decreases the output signal to S motor while extremely using the power steering function (e.g., full steering) consecutively for protecting S motor and S control unit (verload protection control). While activating overload protection control, the assist torque gradually decreases, and the steering wheel turning force becomes heavy. The normal assist torque is recovered if the steering wheel is not turned for a while. WRG/TR/ ST WRG/TR/ ST : Warning amp/ndicator amp : ame esign ayout/unction S warning lamp or layout, refer to -9, "WRG/TR/ ST : Warning amp/ndicator amp". or function, refer to -9, "WRG/TR/ ST : Warning amp/ndicator amp". -9

10 GSS SYST (S TR UT) < SYST SRT > GSS SYST (S TR UT) SUT unction : UT SUT can display each diagnostic item using the diagnostic test modes shown following. iagnostic test mode U identification *: The following diagnosis information is cleared by erasing. T reeze frame data () U TT isplays the part number stored in the control unit. S-G RSUTS Refer to -14, "T ndex". When RT is displayed on self-diagnosis result. The system is presently malfunctioning. unction The part number stored in the control unit can be read. Self diagnostic result Self-diagnostic results and freeze frame data can be read and erased quickly. * ata monitor When ST is displayed on self-diagnosis result. System malfunction in the past is detected, but the system is presently normal. RZ R T () The following vehicle status is recorded when T is detected and is displayed on SUT. tem name G UTR (0 39) nput/utput data in the S control unit can be read. isplay item T TR The following table includes information (items) inapplicable to this vehicle. or information (items) applicable to this vehicle, refer to SUT display items. TTRY VT (V) TRQU SSR (m) The number of times that ignition switch is turned after the T is detected is displayed. When 0 is displayed: t indicates that the system is presently malfunctioning. When except 0 is displayed: t indicates that system malfunction in the past is detected, but the system is presently normal. T: ach time when ignition switch is turned to, numerical number increases in When the operation number of times exceeds 39, the number do not increase and 39 is displayed until selfdiagnosis is erased. onitor item (Unit) Remarks isplays the power supply voltage for S control unit. isplays steering wheel turning force detected by torque sensor. TR URRT () isplays the current value consumed by S motor. *1 TR SG () SSST TRQU (m) /U T ( ) or ( ) SSST V (%) isplays the current commanded value to S motor. isplays assist torque of S motor being output by the electric power steering. isplays the temperature of the S control unit. ormally displays 100%. n case of an excessive stationary steering, the assist curvature gradually falls. owever, it return to 100% when left standing. *2 V S (km/h) or () Vehicle speed is displayed from vehicle speed signal via communication. *3 WRG (n/ff) G STTUS (Stop/Run) S warning lamp control status is displayed. ngine speed is displayed from engine status signal via communication. -10

11 < SYST SRT > GSS SYST (S TR UT) *1: lmost in accordance with the value of TR SG. t is not a malfunction though these values are not accorded when steering quickly. *2: ormally displays 100%. n case of an excessive stationary steering, the assist curvature gradually falls. owever, it returns to 100% when left standing. *3: t is not a malfunction, though it might not be corresponding just after ignition switch in turned. -11

12 S TR UT < U GSS RT > U GSS RT S TR UT Reference Value : VUS T GSS T The following table includes information (items) inapplicable to this vehicle. or information (items) applicable to this vehicle, refer to SUT display items. UT: The output signal indicates the S control unit calculation data. The normal values will be displayed even in the event that the output circuit (harness) is open. onitor item ondition ata monitor TTRY VT gnition switch: attery voltage TRQU SSR TR URRT TR SG ngine running ngine running ngine running Steering wheel: ot steering (There is no steering force) Steering wheel: Right turn Steering wheel: eft turn Steering wheel: ot steering (There is no steering force) Steering wheel: Right or left turn Steering wheel: ot steering (There is no steering force) Steering wheel: Right turn Steering wheel: eft turn pprox. 0 m isplay value ositive value (m) egative value (m) pprox. 0 isplays consumption current of S motor () *1 pprox. 0 ositive value () egative value () SSST TRQU ngine running pprox. 0 m *2 /U T gnition switch or engine running SSST V ngine running 100 % *3 V S WRG Vehicle stopped While driving S warning lamp: S warning lamp: isplays temperature of inside of S control unit [ ( )] 0 km/h (0 mph) pproximately equal to the indication on speedometer *4 (inside of ±10%) ngine not running Stop G STTUS ngine running Run *1: lmost in accordance with the value of TR SG. t is not a malfunction though these values are not accorded when steering quickly. *2: fixed value is indicated regardless of steering turning. *3: ormally displays 100%. n case of an excessive stationary steering, the assist curvature gradually falls. owever, it returns to 100% when left standing. *4: t is not a malfunction, though it might not be corresponding just after ignition switch in turned. n ff -12

13 < U GSS RT > TR YUT S TR UT YS VUS G0156ZZ Terminal o. (Wire olor) ail-safe : f any malfunction occurs in the system and control unit detects the malfunction, S warning lamp on combination meter turns to indicate system malfunction. When S warning lamp is, the system enters into a manual steering state. (ontrol turning force steering wheel becomes heavy.) Under abnormal vehicle speed signal conditions, vehicle speed is judged as constant. rotection unction escription + Signal name nput/utput 1 () 2 () 4 (R) 9 (R) 10 () 15 (R) 16 (Y) 17 () 18 (W) ondition Value (pprox.) - nput/utput - nput/utput Ground gnition power supply nput gnition switch: gnition switch: attery voltage Ground attery power supply nput lways attery voltage Ground Ground lways 0 V Ground Torque sensor ground lways 0 V Ground Torque sensor main nput Ground Torque sensor sub nput Ground Torque sensor power supply gnition switch: ngine running gnition switch: ngine running Steering wheel: ot steering (There is no steering force) Steering wheel: steering Steering wheel: ot steering (There is no steering force) Steering wheel: steering 0 V 2.5 V 1.6 V 3.4 V (The value is changed according to steering left or right) 2.5 V 1.6 V 3.4 V (The value is changed according to steering left or right) utput gnition switch: 5 V : S control unit decreases the output signal to S motor while extremely using the power steering function (e.g., full steering) consecutively for protecting S motor and S control unit (verload protection control). While activating overload protection control, the assist torque gradually decreases, and the steering wheel -13

14 S TR UT < U GSS RT > turning force becomes heavy. The normal assist torque is recovered if the steering wheel is not turned for a while. T nspection riority hart : When multiple Ts are detected simultaneously, check one by one depending on the following priority list. riority riority order item (T) 1 U1000 RUT V S TTRY VT 4 ther than the above T ndex : T tems S warning lamp Reference 1601 TTRY VT -22, "T ogic" 1604 TRQU SSR -25, "T ogic" 1606 S TR -27, "T ogic" 1607 R -28, "T ogic" 1608 TR UT / * -28, "T ogic" 1609 V S -29, "T ogic" U1000 RUT -30, "T ogic" *: ven if T is detected, S warning lamp does not turn when assist torque is generated. -14

15 < WRG GR > WR STRG TR SYST WRG GR WR STRG TR SYST Wiring iagram : GW0070G -15

16 < WRG GR > WR STRG TR SYST G0050G -16

17 < WRG GR > WR STRG TR SYST G0113G -17

18 < WRG GR > WR STRG TR SYST G0114G -18

19 < S ST > GSS RR WRW S ST GSS RR WRW Work low : T W 1.TRVW R T USTR larify customer complaints before inspection. irst of all, perform an interview utilizing -20, "iagnostic Work Sheet" and reproduce symptoms as well as fully understand it. sk customer about his/her complaints carefully. heck symptoms by driving vehicle with customer, if necessary. UT: ustomers are not professional. ever guess easily like maybe the customer means that..., or maybe the customer mentions this symptom. >> G T SYT Reproduce the symptom that is indicated by the customer, based on the information from the customer obtained by interview. lso check that the symptom is not caused by protection function. Refer to -13, "rotection unction". UT: 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. >> G T 3. 3.RR S-GSS erform self-diagnosis. s any T detected? YS >> Record or print T and freeze frame data (). G T 4. >> G T 6. 4.R SYT 1. rase self-diagnostic results. 2. erform T confirmation procedures for the malfunctioning system. T: f some Ts are detected at the same time, determine the order for performing the diagnosis based on - 14, "T nspection riority hart". s any T detected? YS >> G T 5. >> heck harness and connectors based on the information obtained by interview. Refer to G-39, "ntermittent ncident". 5.RR R R UTG RTS Repair or replace malfunctioning parts. Reconnect part or connector after repairing or replacing. When T is detected, erase self-diagnostic results for S. >> G T 7. 6.TY UTG SYST Y SYT GSS stimate malfunctioning system based on symptom diagnosis and perform inspection. an the malfunctioning system be identified? -19

20 < S ST > GSS RR WRW YS >> G T 7. >> heck harness and connectors based on the information obtained by interview. Refer to G-39, "ntermittent ncident" heck the reference value for S control unit. 2. Recheck the symptom and check that symptom is not reproduced on the same conditions. s the symptom reproduced? YS >> G T 3. >> nspection nd. iagnostic Work Sheet : escription n general, customers have their own criteria for a problem. Therefore, it is important to understand the symptom and status well enough by asking the customer about his/her concerns carefully. To systemize all the information for the diagnosis, prepare the interview sheet referring to the interview points. n some cases, multiple conditions that appear simultaneously may cause a T to be detected. nterview sheet sample ustomer name R/S Registration number Vehicle type nterview sheet nitial year registration Storage date ngine ileage km (ile) Symptom V The steering wheel position (center) is in the wrong position. S warning lamp turns on. oise Vibration thers ( ) irst occurrence Recently thers ( ) requency of occurrence lways Under a certain conditions of Sometimes (time(s)/day) limate conditions Road conditions peration conditions, etc. rrelevant Weather ine loud Rain Snow thers ( ) Temperature ot Warm ool old Temperature pprox. ( ) Relative humidity igh oderate ow Urban area Suburb area igh way ountain road (uphill or down hill) Rough road rrelevant When engine starts uring idling uring driving uring acceleration t constant speed driving uring deceleration uring cornering (right curve or left curve) uring steering -20

21 < S ST > GSS RR WRW ustomer name R/S Registration number Vehicle type nterview sheet nitial year registration Storage date ngine ileage km (ile) V ther conditions emo -21

22 1601 TTRY WR SUY < T/RUT GSS > T/RUT GSS 1601 TTRY WR SUY T ogic : T TT G T isplay item alfunction detected condition ossible cause 1601 TTRY VT T RT RUR 1.RTG When a power supply voltage to the S control unit is maintained at 17.5 V or more or at less than 9 V continuously for five second or more. arness or connector S control unit use ower supply system attery f T RT RUR has been previously conducted, always turn ignition switch and wait at least 10 seconds before conducting the next test. >> G T 2. 2.T RRUT RUR 1. Turn the ignition switch to. 2. erform S self-diagnosis. s T 1601 detected? YS >> roceed to diagnosis procedure. Refer to -22, "iagnosis rocedure". >> nspection nd. iagnosis rocedure : Regarding Wiring iagram information, refer to -15, "Wiring iagram". 1. S TR UT GRU RUT 1. Turn ignition switch. 2. isconnect S control unit harness connector. 3. heck continuity between S control unit harness connector terminal and ground. onnector S control unit Terminal ontinuity Ground Yes 4. onnect S control unit harness connector. YS >> G T 2. >> Repair open circuit or short to ground or short to power in harness or connectors. 2. S TR UT WR SUY RUT (1) 1. heck voltage between S control unit harness connector terminals and ground. -22

23 < T/RUT GSS > 1601 TTRY WR SUY onnector S control unit Terminal Voltage 87 4 Ground pprox. 0 V 2. Turn ignition switch. UT: ever start the engine. 3. heck voltage between S control unit harness connector and ground. onnector S control unit Terminal Voltage 87 4 Ground attery voltage YS >> G T 4. >> G T S TR UT WR SUY RUT (2) 1. Turn ignition switch. 2. heck the 10 fuse (#5). 3. heck the harness for open or short between S control unit harness connector terminal 4 and the 10 fuse (#5). YS >> erform the trouble diagnosis for ignition power supply circuit. Refer to S-70, "Wiring iagram". >> Repair or replace the malfunctioning parts. 4. S TR UT WR SUY RUT (3) 1. Turn ignition switch. 2. heck voltage between S control unit harness connector terminals and ground. onnector S control unit Terminal Voltage 37 9 Ground attery voltage 3. Turn ignition switch. UT: ever start the engine. 4. heck voltage between S control unit harness connector and ground. onnector S control unit Terminal Voltage 37 9 Ground attery voltage YS >> G T 6. >> G T S TR UT WR SUY RUT (4) 1. Turn ignition switch. 2. heck the 60 fusible link (#). 3. heck the harness for open or short between S control unit harness connector terminal 9 and the 60 fusible link (#). YS >> erform the trouble diagnosis for power supply circuit. Refer to S-70, "Wiring iagram". >> Repair or replace the malfunctioning parts. -23

24 1601 TTRY WR SUY < T/RUT GSS > 6. TRS RSS TRS heck the S control unit pin terminals for damage or loose connection with harness connector. YS >> S control unit is malfunctioning. Replace steering column assembly. Refer to ST-12, "Removal and nstallation". >> Repair or replace the malfunctioning parts. -24

25 < T/RUT GSS > 1604 TRQU SSR T ogic T TT G 1604 TRQU SSR : T isplay item alfunction detected condition ossible cause 1604 TRQU SSR When torque sensor output signal is malfunctioning. T RT RUR 1.RTG arness or connector Torque sensor S control unit f T RT RUR has been previously conducted, always turn ignition switch and wait at least 10 seconds before conducting the next test. >> G T 2. 2.T RRUT RUR 1. Turn the ignition switch to. 2. erform S self-diagnosis. s T 1604 detected? YS >> roceed to diagnosis procedure. Refer to -25, "iagnosis rocedure". >> nspection nd. iagnosis rocedure : Regarding Wiring iagram information, refer to -15, "Wiring iagram". 1. TRQU SSR WR SUY RUT 1. Turn ignition switch. 2. heck voltage between S control unit harness connector terminals and ground. UT: Steering wheel is neutral position. (There is no steering force.) onnector S control unit Terminal Voltage Ground pprox. 5 V YS >> G T 2. >> erform the trouble diagnosis for battery power supply circuit. Refer to -22, "iagnosis rocedure". 2. TRQU SSR GRU RUT 1. Turn ignition switch. 2. heck continuity between S control unit harness connector terminal and ground. UT: Steering wheel is neutral position. (There is no steering force.) -25

26 < T/RUT GSS > 1604 TRQU SSR onnector S control unit Terminal ontinuity Ground Yes YS >> G T 3. >> Repair open circuit or short to ground or short to power in harness or connectors. 3. TRQU SSR SG 1. Turn ignition switch to. 2. heck voltage between S control unit harness connector terminal and ground. UT: Steering wheel is neutral position. (There is no steering force.) onnector S control unit Terminal Voltage Ground pprox. 2.5 V 3. Start the engine. 4. heck voltage between S control unit harness connector terminal and ground. UT: Steering wheel is right or left turn. onnector S control unit Terminal Voltage 17 pprox. 1.6 V 3.4 V (The value is 27 Ground 16 changed according to steering left or right) YS >> G T 4. >> Torque sensor is malfunction. Replace steering column assembly. Refer to ST-12, "Removal and nstallation". 4. TR 1. Turn ignition switch. 2. isconnect S control unit harness connector. 3. heck terminal for deformation, disconnection, looseness, and so on. f any malfunction is found, repair or replace terminal. YS >> Replace S control unit. Refer to -39, "Removal and nstallation". >> Repair or replace the malfunctioning parts. -26

27 < T/RUT GSS > 1606 S TR T ogic 1606 S TR : T TT G T isplay item alfunction detected condition ossible cause 1606 S TR T RT RUR 1.RTG When the motor driver malfunction of S control unit or S motor malfunction is detected. arness or connector S motor S control unit f T RT RUR has been previously conducted, always turn ignition switch and wait at least 10 seconds before conducting the next test. >> G T 2. 2.T RRUT RUR 1. Turn the ignition switch to. 2. erform S self-diagnosis. s T 1606 detected? YS >> roceed to diagnosis procedure. Refer to -27, "iagnosis rocedure". >> nspection nd. iagnosis rocedure : TRS RSS TRS heck S control unit pin terminals for damage or loose connection with harness connector. f any items are damaged, repair or replace the malfunctioning parts. YS >> G T 2. >> Repair or replace the malfunctioning parts. 2.RR S-GSS 1. rase self-diagnostic results for S. 2. Turn the ignition switch, and then wait 10 seconds and more. 3. erform self-diagnosis for S. s T 1606 detected? YS >> Replace S control unit. Refer to -39, "Removal and nstallation". >> heck intermittent incident. Refer to G-39, "ntermittent ncident". -27

28 1607, 1608 S TR UT < T/RUT GSS > 1607, 1608 S TR UT T ogic : T TT G T isplay item alfunction detected condition ossible cause R TR UT T RT RUR 1.RTG When the memory (R) system malfunction is detected in S control unit. When the internal malfunction is detected in S control unit. S control unit f T RT RUR has been previously conducted, always turn ignition switch and wait at least 10 seconds before conducting the next test. >> G T 2. 2.T RRUT RUR 1. Turn the ignition switch to. 2. erform S self-diagnosis. s T 1607 or 1608 detected? YS >> roceed to diagnosis procedure. Refer to -28, "iagnosis rocedure". >> nspection nd. iagnosis rocedure : TRS RSS TRS heck S control unit pin terminals for damage or loose connection with harness connector. f any items are damaged, repair or replace the malfunctioning parts. YS >> G T 2. >> Repair or replace the malfunctioning parts. 2.RR S-GSS 1. rase self-diagnostic results for S. 2. Turn the ignition switch, and then wait 10 seconds and more. 3. erform self-diagnosis for S. s T 1607 or 1608 detected? YS >> Replace S control unit. Refer to -39, "Removal and nstallation". >> heck intermittent incident. Refer to G-39, "ntermittent ncident". -28

29 < T/RUT GSS > 1609 V S SG T ogic T TT G 1609 V S SG : T isplay item alfunction detected condition ossible cause 1609 V S T RT RUR 1.RTG alfunction is detected in vehicle speed signal that is output from S actuator and electric unit (control unit) via communication. S actuator and electric unit (control unit) input signal malfunction is detected. arness or connector ( communication line) S control unit S malfunction - Vehicle speed signal malfunction f T RT RUR has been previously conducted, always turn ignition switch and wait at least 10 seconds before conducting the next test. >> G T 2. 2.T RRUT RUR 1. Turn the ignition switch to. 2. erform S self-diagnosis. s T 1609 detected? YS >> roceed to diagnosis procedure. Refer to -29, "iagnosis rocedure". >> nspection nd. iagnosis rocedure 1.RR S TUTR TR UT (TR UT) S-GSS 1. Turn the ignition switch to. 2. erform S self-diagnosis. s any T detected? YS >> heck the T. Refer to -14, "T ndex". >> G T TRS RSS TRS heck S control unit pin terminals for damage or loose connection with harness connector. YS >> G T 3. >> Repair or replace the malfunctioning parts. 3.RR S-GSS erform S self-diagnosis. s T 1609 detected? YS >> Replace S control unit. Refer to -39, "Removal and nstallation". >> heck intermittent incident. Refer to G-39, "ntermittent ncident". :

30 < T/RUT GSS > U1000 RUT escription U1000 RUT : (ontroller rea etwork) is a serial communication line for real time application. t is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. any electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). n communication, control units are connected with 2 communication lines (- line, - line) allowing a high rate of information transmission with less wiring. ach control unit communicate data but selectively reads required data only. T ogic T TT G : T isplay item alfunction detected condition ossible cause U1000 T RT RUR 1.RTG RUT S control unit is not transmitting/receiving communication signal for 2 seconds or more. communication malfunction S control unit f T RT RUR has been previously conducted, always turn ignition switch and wait at least 10 seconds before conducting the next test. >> G T 2. 2.T RRUT RUR 1. Turn the ignition switch to. 2. erform S self-diagnosis. s T U1000 detected? YS >> roceed to diagnosis procedure. Refer to -30, "iagnosis rocedure". >> nspection nd. iagnosis rocedure : roceed to -16, "Trouble iagnosis low hart". -30

31 < T/RUT GSS > S WRG omponent unction heck S WRG : T UT T S WRG heck that the S warning lamp turns when ignition switch turns. Then, S warning lamp turns after the engine is started. YS >> nspection nd. >> erform trouble diagnosis. Refer to -31, "iagnosis rocedure". iagnosis rocedure 1.RR S-GSS 1. Turn the ignition switch to. 2. erform S self-diagnosis. s any T detected? YS >> heck the T. Refer to -14, "T ndex". >> G T S WRG SG : Turn the ignition switch. UT: ever start the engine. 2. Select T TR of S and select WRG. 3. heck that the S warning lamp is turned. 4. Start the engine. UT: ever drive the vehicle. 5. heck that the S warning lamp is turned. YS >> erform the trouble diagnosis for combination meter power supply circuit. Refer to W-52, "T TR : iagnosis rocedure". >> Replace S control unit. Refer to -39, "Removal and nstallation". -31

32 S WRG S T TUR < SYT GSS > SYT GSS S WRG S T TUR escription : S warning lamp does not turn when turning ignition switch from. (heck the illumination of the S warning lamp.) iagnosis rocedure 1. S WRG : erform the trouble diagnosis of S warning lamp. Refer to -31, "iagnosis rocedure". YS >> heck that there is no malfunction in each harness connector pin terminal or disconnection. >> Repair or replace the specific malfunctioning part. -32

33 < SYT GSS > S WRG S T TUR S WRG S T TUR escription S warning lamp does not turn several seconds after engine started. iagnosis rocedure : : RR S-GSS 1. Turn the ignition switch to. 2. erform S self-diagnosis. s any T detected? YS >> heck the T. Refer to -14, "T ndex". >> G T S WRG erform the trouble diagnosis of S warning lamp. Refer to -31, "iagnosis rocedure". YS >> G T 3. >> Repair or replace the specific malfunctioning part. 3. S TR UT WR SUY GRU RUT erform the trouble diagnosis of S control unit power supply and ground. Refer to -22, "iagnosis rocedure". YS >> heck that there is no malfunction in each harness connector pin terminal or disconnection. >> Repair or replace the specific malfunctioning part. -33

34 STRG W TURG R S VY R GT < SYT GSS > STRG W TURG R S VY R GT escription : Steering wheel turning force is heavy or light. iagnosis rocedure : RR S-GSS 1. Turn the ignition switch to. 2. erform S self-diagnosis. s any T detected? YS >> heck the T. Refer to -14, "T ndex". >> G T T UT T S WRG heck that the S warning lamp turns when ignition switch turns. Then, S warning lamp turns after the engine is started. YS >> G T 3. >> erform trouble diagnosis of S warning lamp. Refer to -31, "iagnosis rocedure". 3. S TR UT SG (1) 1. Start the engine. UT: ever drive the vehicle. 2. Select SSST V in T TR in S. ose the item in T TR indicate 100%? YS >> G T 6. >> G T S TR UT SG (2) Select TTRY VT in T TR in S. ose the item in T TR indicate 10 V or more? YS >> G T 5. >> erform trouble diagnosis of S control unit power supply and ground. Refer to -22, "iagnosis rocedure". 5. S TR UT SG (3) 1. Select SSST V in T TR in S. 2. Stop the S system until the item in T TR becomes 100%. T: While stopping the S system, do not turn steering wheel. 3. heck that the symptom continues. ose the symptom continue? YS >> G T 6. >> The assist torque decreases because of protection function. This is not malfunction. nspection nd. 6. S TR UT SG (4) 1. Start the engine. UT: -34

35 STRG W TURG R S VY R GT < SYT GSS > ever drive the vehicle. 2. Turn steering wheel from full left stop to full right stop. 3. Select TRQU SSR in T TR in S. onitor item ondition isplay value TRQU SSR YS >> G T 8. >> G T S TR Steering wheel: ot steering (There is no steering force) Steering wheel: Right turn Steering wheel: eft turn pprox. 0 m ositive value (m) egative value (m) erform the trouble diagnosis of S motor. Refer to -27, "iagnosis rocedure". YS >> G T 8. >> Repair or replace the specific malfunctioning part. 8. STRG W TURG R heck the steering wheel turning force. Refer to ST-5, "nspection". YS >> nspection nd. >> heck the steering wheel turning force for mechanical malfunction. Refer to ST-8, "nspection". -35

36 U STRG W TURG R RTUR TW RGT T < SYT GSS > U STRG W TURG R RTUR - TW RGT T escription : Unbalance steering wheel turning force and return between right and left. iagnosis rocedure : T UT T S WRG heck the S warning lamp while engine is running. oes the S warning lamp turn? YS >> G T 2. >> Refer to -33, "iagnosis rocedure". 2. W GT 1. heck the wheel alignment. Refer to SU-6, "nspection". 2. erform S self-diagnosis. YS >> G T 3. >> djustment of wheel alignment. Refer to SU-6, "nspection". 3. S TR UT SG 1. Start the engine. UT: ever drive the vehicle. 2. Turn steering wheel from full left stop to full right stop. 3. Select T TR of S and select TRQU SSR. 4. erform the torque sensor inspection. onitor item ondition isplay value TRQU SSR YS >> G T 5. >> G T S TR Steering wheel: ot steering (There is no steering force) Steering wheel: Right turn Steering wheel: eft turn pprox. 0 m ositive value (m) egative value (m) erform the trouble diagnosis of S motor. Refer to -27, "iagnosis rocedure". YS >> G T 5. >> Repair or replace the specific malfunctioning part. 5. STRG W TURG R heck the steering wheel turning force. Refer to ST-5, "nspection". YS >> nspection nd. >> heck the steering wheel turning force for mechanical malfunction. Refer to ST-5, "nspection". -36

37 U STRG W TURG R (TRQU VRT) < SYT GSS > U STRG W TURG R (TRQU VR- T) escription Unbalance steering wheel turning force (torque variation). iagnosis rocedure 1.RR S-GSS 1. Turn the ignition switch to. 2. erform S self-diagnosis. s any T detected? YS >> heck the T. Refer to -14, "T ndex". >> G T T UT T S WRG heck the S warning lamp while the engine is started. oes the S warning lamp turn? YS >> G T 3. >> Refer to -31, "iagnosis rocedure". 3. STRG U STRG GR heck the steering column assembly and steering gear assembly. Steering column assembly. Refer to ST-12, "xploded View". Steering gear assembly. Refer to ST-14, "xploded View". YS >> G T 4. >> Repair or replace the specific malfunctioning part. 4. S TR UT SG (1) 1. Start the engine. UT: ever drive the vehicle. 2. Turn steering wheel from full left stop to full right stop. 3. Select SSST V in T TR in S. ose the item in T TR maintain 100%? YS >> G T 7. >> G T S TR UT SG (2) -37 : : Select TTRY VT in T TR in S. oes the item in T TR indicate 10 V or more? YS >> G T 6. >> erform trouble diagnosis of S control unit power supply and ground. Refer to -22, "iagnosis rocedure". 6. S TR UT SG (3) 1. Select SSST V in T TR in S. 2. Stop the S system until the item in T TR becomes 100%. T: While stopping the S system, do not turn steering wheel. 3. heck that the symptom continues.

38 U STRG W TURG R (TRQU VRT) < SYT GSS > ose the symptom continue? YS >> G T 7. >> The assist torque decreases because of protection function. This is not malfunction. nspection nd. 7. S TR UT SG (4) 1. Start the engine. UT: ever drive the vehicle. 2. Turn steering wheel from full left stop to full right stop. 3. Select TRQU SSR in T TR in S. 4. erform the torque sensor inspection. onitor item ondition isplay value TRQU SSR YS >> G T 9. >> G T S TR Steering wheel: ot steering (There is no steering force) Steering wheel: Right turn Steering wheel: eft turn pprox. 0 m ositive value (m) egative value (m) erform the trouble diagnosis of S motor. Refer to -27, "iagnosis rocedure". YS >> G T 9. >> Repair or replace the specific malfunctioning part. 9. STRG W TURG R heck the steering wheel turning force. Refer to ST-5, "nspection". YS >> nspection nd. >> heck the steering wheel turning force for mechanical malfunction. Refer to ST-5, "nspection". -38

39 < RV STT > S TR UT RV STT S TR UT xploded View : Steering column assembly 2. S control unit 3. racket plate ront Removal and nstallation G0023ZZ : RV UT: isconnect battery negative terminal before starting operations. o not shock S control unit, e.g. drop or hit. o not get S control unit wet with water or other liquid. lso, do not give S control unit a radical temperature change to avoid getting water drops. o not disassemble or remodel S control unit, S motor, torque sensor, harness and harness connectors. 1. Remove steering column assembly. Refer to ST-12, "Removal and nstallation". 2. isconnect S motor harness connector. UT: old and pull the harness connector housing, not pulling harness, when disconnecting harness connectors. lso, do not grip, collapse or apply excessive force to the harness connector. 3. Remove S control unit from steering column assembly. 4. Remove bracket plate from S control unit. STT nstallation is in the reverse order of removal. heck that harness is not damaged when installing S control unit. lso, check that S control unit is installed without pinching harness or trapping foreign materials. fter installing steering column assembly, perform self-diagnosis with SUT to ensure correct operation. Refer to -10, "SUT unction". -39