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1、Steering Special Tools. . . . . . . . . . . . . . . *. System Description Steering Column. . a Energy-absorbing Steering Column /Wheel. . . . . . . . . . . . . . . . . . . . Inspection Steering Wheel Rotational Play . . Steering Effort Check., Power Asist With Car Parked . . . Steering Gearbox Adjus
2、tment . . . Steering Wheel * Removal*.s.* Disassembly/Inspection. . . . . . . . . . . . * Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Steering Column * Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Inspection. . . . . . . . . . . . *.*. * Installa
3、tion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17-2 17-3 17-5 17-6 17-6 17-6 17-7 17-8 17-9 17-10 17-12 17-14 17-15 Manual Steering Component Location Index.,.17-18 Steering Gearbox Removal/Installation. . . . . . . . . . . . . . . .17-l 9 IllustratedIndex.“. . . . . . . . . . . . . .
4、 . . .17-2 1 Disassembly -”. . . . . . . . . . . . . . . *.17-22 Reassembly. . *.*.17-25 Ball Joint Boot Replacement. . . . .17-30 Power Steering System Description Electrical Power Steering. Major Components System Operation. Function and Operation Circuit Diagram Wiring Locations Troubleshooting T
5、roubleshooting Precautions. Troubleshooting Procedures. Test Harness Installation Troubleshooting Steering is heavy. Steering pulls to either side. Indicator light does not come on. Indicator light stays on Troubleshooting chart Troubleshooting by problem code. Component Location * Index. EPS Gear B
6、ox Installation and Removal. IllustratedIndex. EPS Gear Box Inspection Ball Joint Boot Replacement *Power Unit Installation and Removal. *EPS Control Unit Installation and Removal. 17-31 17-31 17-32 17-33 17-34 17-40 17-41 17-42 17-43 17-45 17-46 17-47 17-52 17-63 17-64 17-68 17-69 17-72 17-73 17-74
7、 SUPPLEMENTAL RESTRAINT SYSTEM (SRS) The NSX includes a drivers side Airbag, located in the steering wheel hub, as part of a Supplemental Restraint System (SRS). Information necessary to safely service the SRS is included in this Service Manual. Items marked * in each section include, or are located
8、 near, SRS components. Servicing, disassembling or replacing these items will require special cautions and tools and should therefore be done by an authorized Acura dealer. ? To avoid rendering the SRS inoperative, which can lead to personal injury or death in the event of a severe fron- tal collisi
9、on, all maintenance must be performed by an authorized Acura dealer. ?Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal injury caused by unintentional activation of the Airbag. ? All SRS selectrical wiring harnesses are covered with yellow outer insu
10、lation and related components are locat- ed in the steering column, center console, dash, and dashboard lower panel. Do not use electrical test equip- ment on these circuits. Special Tools Ref. No.Tool NumberDescription 007GAFSD40700Hub Dis/Assembly Base 007MAA-SLOOI OA40 mm, Locknut Wrench 007MAA-S
11、L0020A43 mm, Locknut Wrench 007MAA-SL0030A50 mm, Locknut Wrench g07MAASL0040A 07MAG-SLOOI 07MA.ZSLOOIOO 00Test Pinion Ball Joint Harness Screw Boot Wrench A Clip Guide 807MAZ-SL00200Test Harness B 007MAZ-SL00300Test Harness C 0307MAZ-SL00400EPS power unit checker 007941-6920003Ball Joint Remover 007
12、973-6920001P/S Adjustment Guide 007974-SD90000Steering Inspection Arm OtyPage Reference 217-24 117-7, 70 117-7, 28 117-23, 27 1 1 117-23, 17-30, 17-45, 26, 48, 72 27 50,5 53, 54, 55, 56, 59, 60, 61 117-45, 53, 55 117-45 117-45, 58 117-19, 64 117-25 117-22, 26, 69 - 17-2 System Description -Steering
13、Column The NSX has a tilt/telescopic steering column. The tilt/telescopic mechanism makes it possible to adjust the steering wheel in fore and aft, and up and down directions. Tilt Mechanism There is a joint on the upper steering shaft, and the portion of the column between the steering wheel and th
14、is joint is adjustable up and down. When the tilt lever is operated, the lock gears are detached from the column gear to release the lock. The column moves upward or downward on two pivot bolts. When the tilt lever is returned to a fixed position after selecting the steering wheel height, the lock g
15、ear is engaged with the column gear to secure the column. Tl-LT LEVER PIVOT BOLT COLUMN GEAR / LOCK CEAB (contd) 17-3 System Description -Steering Column (contd) Telescopic Mechanism The upper steering shaft is divided into two shafts, connected by splines, making it possible for the shaft to telesc
16、ope while transmitting the rotation of the steering wheel. When the telescopic lever is lowered, the lever pivot turns in a direction to loosen the stopper shim at the tip of the lever pivot, allowing the shaft to make telescope. The telescopic stroke is limited by the slot and stopper on the movabl
17、e shaft. After selecting a steering wheel position and returning the telescopic lever to the fastening position, the stopper shim is pressed against the movable shaft the lever pivot to fasten the sliding part. TELESCOPIC LEVER 17-4 8 . Energy-absorbing Steering Column/Wheel Both the steering column
18、 and steering wheel are designed to absorb impact energy during a collision. Steering Wheel The steering wheel absorbs the energy of a collision through the deformation of the spoke portion. Should the impact absorbing capacity of the column side decrease due to the deformation of the vehicle body d
19、uring a collision, the steering wheel will help absorb the impact. Steering Column The steering column is fastened on the body through a U-shaped plate, and the lower part of the column is inserted into a lower holder. Due to this construction, the steering column will slide in its axial direction w
20、hen a large impact is given in the axial direction of the column. Since the U-shaped plate is fastened to the body, the U-shaped plate is bent and deformed along the guide when the column slides in its axial direction. Through the deformation of the plate, the energy is absorbed and the column slide
21、s forward. When exposed to a greater impact, a shear pin will break and the energy is absorbed by the lower shaft. U-PLATE GUIDE The U-plates absorb an energy while they are straightened by the upper bracket. A SHEAR PINS STEgRING JOINT / SPOKE Inspection - Steering Wheel Rotational Play - 1.Place t
22、he front wheels in a straight ahead position and measure the distance the steering wheel can be turned without moving the front wheels. 2.If the play exceeds the service limit, check all steer- ing components. Service Limit: 5 cm (0.2 in) - Steering Effort Check (Manual Steering Only) 1.Raise the fr
23、ont wheels off the ground (see sec- tion 1). 2.Turn the steering wheel with a spring scale and check its reading. 3.If the reading exceeds the service limit, adjust the steering gearbox as shown on the next page. Service Limit: 20 N (2 kg, 4.4 lb) -Power Assist Check With Car- Parked (Electrical Pow
24、er Steering Only) Turn the steering wheel with a spring scale. Read the measurement when the front wheels or steer- ing wheel start to move. Operation Standard I Condition Stationary Swing operation loadI -Steering Gearbox Adjustment Manual Steering: 1.Loosen the rack guide screw locknut. 2.Tighten,
25、 loosen and retighten the rack guide screw two times to 5 N-m (0.5 kg-m, 3.6 lb-ft), then back it off 15O. 3.Tighten the locknut on the rack guide screw with the special tool. 4.Check for tight or loose steering through the com- plete turning travel. 5. Recheck steering effort. To calculate the indi
26、cated torque value, use the formula on page 17-26. Actual: 66 N-m (6.8 kg-m, 49 lb-ft) Indicated: 52 N-m (5.2 kg-m, 38 lb-ft) RACK GUIDE SCREW 43 inm,LOCKNUT WRENCH 07MAA-SL0020A Electrical Power Steering: 1.Loosen the rack guide screw locknut. 2.Tighten, loosen and retighten the rack guide screw tw
27、o times to 4 N-m (0.4 kg-m, 2.9 lb-ft), then back it off 20+Eo. 3.Tighten the locknut on the rack guide screw with the special tool. 4.Check for tight or loose steering through the com- plete turning travel. 5. Recheck steering assist. To calculate the indicated torque value, use the formula on page
28、 17-70. Actual: 25 N-m (2.5 kg-m, 18 lb-ft) Indicated: 19 N-m (1.9 kg-m, 14 lg-ft) RACK GUIDE SCREW 40 mm, LOCKNUT WRENCH 07MAA-SLOOIOA 17-7 Steering Wheel -Removal Airbag Removal m Store a removed airbag assembly with the pad surfce up, if the airbag is improperly stored face down, accidental deplo
29、yment could propel the unit with enough force to cause serious injury. CAUTION: ? Before removing the steering wheel, aline the front wheels straight ahead. ? Do not install used SRS parts from another car. When repairing, use only new SRS parts. ? Carefully inspect the airbag assembly before instal
30、l- ing. Do not install an airbag assembly that shows signs of being dropped or improperly handled, such as dents, cracks or deformation. ? Always keep the short connector on the airbag con- nector when the harness is disconnected. ? Do not disassemble or tamper with the airbag as- sembly. 1.Disconne
31、ct both the negative cable and positive ca- ble from the battery. 2 .Remove the maintenance lid form the steering wheel lower cover, then remove the short connector. 3.Disconnect the connector between the airbag and cable reel. 4.Connect the short connector to the airbag side of the connector. CONNE
32、CTOR MAINTENANCE CABLE REEL CONNECTOR 3-P SAORT CONNECTO; (RED) 5.Remove the two TORX bolts using a TORX T30 bit, then remove the airbag assembly. CRUISE CONTROL SET/RESUME SWITCH TORX BOLT I TORX BOLTS AIRBAG ASSEMBLY (contd) -Removal (contd) 7.Disconnect the connectors from the horn and cruise con
33、trol set/resume switches remove the airbag con- nector from its dips. CRUISE CONTROL SET/RESUME SWITCHES CONNECTOR 8.Remove the steering wheel nut. 9.Remove the steering wheel by rocking it slightly from side-to-side as you pull steadily with both hands. STEERING WHEEL NUT Replace. -Disassembly/Reas
34、sembly m Store a removed airbag assembly with the pad surface up. If the airbag is improperly stored face down, accidental deployment could propel the unit with enough force to cause serious injury. NOTE: If an intact airbag assembly has been re- moved from a scrapped car or has been found defec- ti
35、ve or damaged during transit, storage or service, it should be deployed (See section 23). CAUTION: ? Carefully inspect the airbag assembly before install- ing. Do not install an airbag assembly that shows signs of being dropped or improperly handled, such as dents, cracks or deformation. ? Always ke
36、ep the short connector on the airbag con- nector when the harness is disconnected. ? Do not disassemble or tamper with the airbag as- sembly. STEERING WHEEL -/ iST LO MAINTENANCETORX BOLT LID .AIRBAGASSEMBLY CRUISE CON+ROL SET/ (1.0 kg-m, 7 lb-ft) RESUME SWITCH Replace. 17-Q Steering Wheel -Installa
37、tion CAUTION: ? Before installing the steering wheel, align the front wheels straight ahead. ? Be sure to install the harness wires so that they are not pinched or interfering with other car parts. ? Do not replace the original steering wheel with any other design, since it will make it impossible t
38、o proper- ly install the airbag. (only use genuine HONDA replace- ment parts) 0 After reassembly, confirm that the wheels are still straight ahead and that steering wheel spoke angle is correct. If minor spoke angle adjustment is neces- sary, do so only by adjustment of the tie rods, not by removing
39、 and repositioning the steering wheel. m Confirm that the airbag assembly is secure- ly attached to the steering wheel; otherwise, severe per- sonal injury could result during later airbag deployment. 1.Before installing the steering wheel, center the ca- ble reel. Do this by first rotating the cabl
40、e reel clockwise un- til it stops. Then rotate it counterclockwise (approximately two turns) until: -The yellow gear tooth lines up with the mark on the cover. -The arrow on the cable reel label points straight up. ARROW MARK YELLOW GEAR TOOTH ALIGNMENT MARK 2.Install the steering wheel. NOTE:Be sur
41、e the steering wheel shaft engages the cable reel. 50 N.m 3.Insert the cruise control set/resume 4-P connector and airbag connector to the steering wheel clips. 4. Connect the horn connector. CRUISE CONTROL SET/RESUME SWITCHES CONNECTOR HORN CONNECTOR a 5.Install the airbag assembly with new TORX bo
42、lts. TORX” BOLT 10 N-m (1.0 kg-m, 7 lb-ft) Replace TORXO BOLTSI IO N-m (1.0 kg-m, 7 lb-ft)AIRBAG ASSEMBLY Replace 7.Disconnect the short connector from the airbag con- nector. a 8.Connect the airbag 3-P connector and cable reel 3-P connector. 9.Attach the short connector to the lid, and install the
43、lid on the steering wheel lower cover. I MAINTENANCE t I LIDSHORT CONNECTOR (RED) 10. Connect the battery positive terminal and then con- nect the negative terminal. 1 1. After installing the airbag assembly, confirm proper system operation: 0 Turn the ignition to II: the instrument panel SRS warnin
44、g light should come on for about 6 seconds and then go off. 0 Confirm operation of horn buttons. 0 Confirm operation of cruise control set/resume switch. 0 Turn the steering wheel counterclockwise and make sure the yellow gear tooth still lines up with the alignment mark. YELLOW GEARTOOTH ALIGNMENT
45、MAR 17-I 1 Steering Column -Removal 1.Disconnect both the negative cable and positive ca- ble from the battery. 2. Remove the airbag assembly and steering wheel from the column (page 17-8). 3.Remove the dashboard lower panel, knee bolster pad, and knee bolster. KNEE BOLSTER DASHiOARD KNEE BOLSTER LO
46、WER PANELPAD 4.Remove the column lower face. Disconnect the con- nector between the cable reel and the SRS main har- ness, then remove the connector holder. N FACE 5.Remove the column lower cover, and column upper cover. NOTE:Be careful not to damage the column covers. COLUMN UPPER COVER if-5 COVER
47、6. Disconnect the TCS sensor. TCSCONNECTOR (GREEN) SRS MAIN - HARNESS (YELLOW) CABLE REEL CONNECTOR (YELLOW) CONjllECTOR HOLDER TCS SENiOR 7.Remove the combination switch assembly from the column shaft. NOTE: The combination switch can be removed by disconnecting only the TCS connector. COMBINATION
48、SWITCH 8.Remove the steering joint cover. STEERING JOdT COVER 9.Remove the steering joint bolts and washers from the joints. LOCK WASHERS STEERlNG”JOlNT BOLTS 10. Disconnect the ignition switch connectors and re- move the column holder, then remove the column assembly by removing the attaching nuts.
49、 HOLDERFLANGE NUTS 8x1.25 mm BOLT WASHERS 17-13 Steering Column 6 m m STEERING CO ASSEMBLY SOCKET BOLT RETAWNGCheck for damage. STEERING BOLTS 23 N-m (2.3 kg-m, 8x 1.25 mmNlJi 1 6N-m (1.6 kg-m, 12 lb-ft) Y 8x 1.25 mm BOLT/WASHERS 23 Nm (2.3 kg-m. 1 7lb-ft) CLIP Y O K E 17 lb-ft) v- CLAMPS JOINT COVER NOTE: ? Check the telescopic mechanism, tilt mechanism, and steering joint bearings or steering shaft for movement and damage. Replace as an assembly if damaged or faulty. ? If either the steering column assembly or TCS sensor is removed, select the appropriate shim and