sensor ACURA TL 1995 Service Workshop Manual

Troubleshooting Precaution s
1. I n an y o f thes e cases , th e TC S indicato r ligh t ma y com e o n o r sta y o n eve n th e TC S syste m is normal .
• Th e coolan t temperatur e is 32° F (0°C ) o r below .
• Th e parkin g brak e is applie d fo r mor e tha n 3 0 second s whil e th e vehicl e is bein g driven .
• Th e tir e pressur e is no t a t th e specifie d pressure .
• Th e whee l senso r signa l i s interrupte d durin g drivin g a t th e spee d o f 6 mp h (1 0 km/h ) o r abov e du e to , fo r example ,
th e vehicl e spinning .
• Th e MA P sensor , coolan t temperatur e sensor , IC M o r th e atmospheri c pressur e senso r syste m o f th e PGM-F I syste m
is faulty .
2. TC S doe s no t functio n whe n th e TC S indicato r ligh t i s ON .
3 . Whe n bot h th e TC S indicato r ligh t an d th e MI L ar e ON , troubleshoo t th e PGM-F I syste m first .
4 . Whe n bot h th e TC S indicato r ligh t an d th e AB S indicato r ligh t ar e ON , troubleshoo t th e AB S first .
5 . Th e DT C 4- 9 (AB S down ) i s memorize d whe n th e AB S contro l uni t canno t outpu t th e whee l spee d signa l du e to , fo r
example , a missin g o r blow n AB S B 2 (1 5 A ) fuse . I f yo u fai l t o eras e th e DT C o f th e TC S afte r troubleshootin g th e ABS ,
th e DT C remain s in th e TC S contro l uni t memory . Therefore , b e sur e to test-driv e th e vehicl e an d chec k th e TC S indica -
to r ligh t befor e startin g th e troubleshootin g th e TCS .
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Electronic Component s
Steering Angl e Senso r Replacemen t
CAUTION: D o no t damag e o r dro p th e steerin g angl e senso r a s it i s sensitive .
1 . Remov e th e combinatio n switc h (refe r t o sectio n 1 7 in th e '9 5 - '9 8 Acur a 2.5T L servic e manual , P/ N 61SW504) .
2 . Remov e th e circli p an d screw , the n remov e th e steerin g angl e senso r fro m th e combinatio n switch .
3 . Installatio n i s i n th e revers e orde r o f removal .
CAUTION : D o no t appl y an y greas e o r oi l t o th e steerin g angl e sensor .
4 . Perfor m th e steerin g angl e senso r syste m check . SCRE W
STEERING ANGL E SENSO R
COMBINATIO N SWITC H
CANCE L CA M
WAV E WASHE R
SPRING
LOWER COVE R
NOTE: Whe n reassembling , alig n th e tab s o f th e join t an d
cance l ca m to th e sli t o f th e steerin g angl e sensor .
Steering Angl e Senso r Syste m Chec k
1. Star t th e engine .
2 . Pus h th e TC S switc h thre e time s withi n thre e seconds .
NOTE: Alway s maintai n th e sam e numbe r o f rotations .
3. Slowl y tur n th e steerin g whee l fro m clockwis e mor e tha n 1. 5 turns .
NOTE :
• Star t checkin g afte r th e steerin g whee l move s a t leas t 1. 5 turns .
• Tur n th e steerin g whee l slowly , n o faste r tha n on e tur n in fou r seconds .
4 . Pus h th e TC S switc h twic e withi n thre e seconds .
NOTE : Alway s maintai n th e sam e numbe r o f rotations .
5 . Slowl y tur n th e steerin g whee l counterclockwise , an d chec k th e numbe r o f time s th e TC S indicato r ligh t flashe s afte r
th e whee l ha s move d approximatel y on e turn .
NOTE :
• Star t countin g afte r th e steerin g whee l move s on e turn .
• Tur n th e steerin g whee l slowly , n o faste r tha n on e tur n i n fou r seconds .
Standar d numbe r o f time s th e TC S indicato r ligh t flashes : 2 time s ('9 6 model )
: 4 time s ('9 7 model )
6 . I f ther e is a n abnormality , chec k th e troubleshooting flowchart (se e pag e 19-126 ).
JOIN T
CIRCLI P
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Electronic Components

TCS Control Valve Assembly Replacement

CAUTION: Be careful not to damage the TCS control valve when handling the TCS control valve assembly.

1. Disconnect the vacuum tube, breather pipe and air hose from the intake air duct.

2. Loosen the intake air duct band screws, then remove the intake air duct.

BREATHER PIPE

AIR HOSE

NOTE: When installing the duct,

align the marks.
NOTE: When installing the duct,

align the cutout with mark.

VACUUM TUBE

INTAKE AIR DUCT

BAND SCREW

INTAKE AIR DUCT

3. Disconnect the TCS control valve angle sensor connector and actuator connector.

4. Remove the TCS control valve assembly and bracket.

5. Install the TCS control valve assembly in the reverse order of removal.

TCS CONTROL VALVE ANGLE

SENSOR CONNECTOR
6 x 1.0 mm BOLT

12 N-m (1.2 kgf-m, 9 Ibf-ft)

TCS CONTROL VALVE

ASSEMBLY

8 x
1.25
mm NUT

22 N-m (2.2 kgf-m, 16 Ibf-ft)

8 x 1.25 mm BOLT

22 N-m (2.2 kgf-m, 16 Ibf-ft)

BRACKET
TCS CONTROL VALVE

ACTUATOR CONNECTORProCarManuals.com

Ignition Syste m
Descriptio n
Ignition Timin g Contro l
Th e programme d ignitio n syste m o n thi s engine provide s optimu m contro l o f ignitio n timing . A microcompute r deter -
mine s th e timin g base d o n informatio n abou t engin e spee d an d intak e manifol d vacuum , whic h i s transmitte d b y signal s
fro m th e CKP/CY P sensor , throttl e positio n (TP ) sensor , engin e coolan t temperatur e (ECT ) sensor , an d MA P sensor . Thi s
system , whic h i s no t dependen t o n a governo r o r vacuu m diaphragm , i s capabl e o f providin g ignitio n advanc e character -
istic s whic h canno t b e provide d b y conventiona l governors .
Basic Contro l
The PC M ha s store d withi n it th e basi c ignitio n timin g fo r operatin g condition s base d upo n engin e spee d an d intak e mani -
fol d vacuum . Wit h th e compensatin g signal s fro m sensors , th e syste m determine s optimu m ignitio n timin g an d duratio n
fo r ambien t condition s an d send s voltag e pulse s t o th e ICM .
Compensatio n o f ignitio n timing :
Contro l a t Star t
Ignitio n timin g is fixe d a t 5 ° BTD C fo r cranking . Th e crankin g is detecte d b y th e CK P senso r (crankin g rpm ) an d starte r signal .
Misfirin g Detectio n
A s par t o f th e OB D II misfirin g detectio n system , eac h o f th e ignitio n coi l ha s a built-i n spar k plu g voltag e sensor . Thi s senso r
detect s th e lon g duratio n hig h voltag e whic h occur s in cas e o f unfavorabl e combustio n o r misfiring . (Fo r details , se e
section 11 ).
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Component/Wiring Location s
Index
SRS INDICATO R LIGH T (I n th e gaug e assembly )
Troubleshooting , pag e 24-1 3 T
o HOR N SWITC H
DASHBOAR D WIR E HARNES S
t o SR S INDICATO R LIGH T in
GAUG E ASSEMBL Y
5 P CONNECTO R T
o CRUIS E CONTRO L
SET/RESUM E SWITC H
T o DRIVER' S AIRBA G
FRON T PASSENGER' S AIRBA G
ASSEMBL Y
Replacement , pag e 24-4 6
Disposal , pag e 24-5 0
MAI N WIR E HARNES S
t o DASHBOAR D
WIR E HARNES S
16 P CONNECTO R
SR S MAI N HARNES S
to MAI NWIRE HARNES S
3 P CONNECTO R
SRS MAI N HARNES Sto FRON T PASSENGER' SAIRBAG3P ('9 6 Model) ,2P ('9 7 - 9 8 Models )
CONNECTO R
SERVIC E CHEC K
CONNECTO R (2P )
[ORN , GRN/YEL ]
SR S MAI N HARNES S
SRS UNI T GROUN D
SRS MAI N HARNES S
t o UNDER-DAS H
FUSE/RELA Y BO X
2 P CONNECTO R
MEMOR Y ERAS E SIGNA L
(MES ) CONNECTO R (2P )
[GRY , GRY ] or [GRN , GRN ]
SRS UNI T(Includin g safin g senso rand impac t sensor)
Replacement , pag e 24-5 6
SR S MAI N HARNES S
to SR S UNI T18P CONNECTO R
SR
S MAI N HARNES S
to CABL E REE L2P CONNECTO R
DRIVER'
S AIRBA G
ASSEMBL Y
Replacement ,
pag e 24-4 6
Disposal , pag e 24-50
CABL E REE LReplacement ,
pag e 24-5 2
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Engine Removal/Installatio n
Removal (cont'd )
16. Reliev e fue l pressur e (se e sectio n 11 ).
D o no t smok e whil e workin g o n th e fue l system .
Kee p ope n flam e o r spark s awa y fro m th e wor k
area . Drai n fue l onl y int o a n approve d container .
17 . Remov e th e fue l fee d hose , fue l retur n hos e an d
vacuu m hose .
FUEL RETUR N
HOS E SERVIC
E BOL T
1 2 N- m (1. 2 kgf-m ,
WASHE R 8. 7 Ibf-ft )
Replace .
BANJO BOL T
3 3 N- m (3. 4 kgf-m ,
2 5 Ibf-ft )
WASHER S
Replace .
VACUUMHOSE FUE
L FEE D
HOS E
18. Remov e th e engin e wir e harnes s clamp , wir e har -
nes s sta y an d groun d cable .
6 x 1. 0 m m12 N- m (1.2 kgf-m , 8. 7 Ibf-ft )
WIR E HARNES S
STA Y GROUN
D
CABLE
ENGIN E WIR E
HARNES S CLAM P
19. Remov e th e A/ C compressor .
• D o no t disconnec t th e A/ C hoses .
A/C COMPRESSO R
8 x 1.2 5 mm22 N- m (2. 2 kgf-m ,
1 6 Ibf-ft )
20. Remov e th e vehicl e spee d senso r (VSS)/powe r steer -
in g spee d sensor . D o no t disconnec t th e flui d hoses .
VSS/POWE R STEERIN G
SPEE D SENSO R VS
S CONNECTO R
FLUI D HOSE S
6 x 1. 0 m m12 N- m (1. 2 kgf-m ,
8. 7 Ibf-ft )
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TDC/CKP/CYP/CKF Sensor s
Replacemen t
1. Se t th e No . 1 pisto n is a t TD C (se e pag e 6-12 ).
2 . Remov e th e timin g bel t (se e pag e 6-10 ).
3 . Remov e th e CY P sensor , the n remov e th e camshaf t
pulley.
CYP SENSO R
6 x 1. 0 m m12 N- m (1. 2 kgf-m ,
8. 7 Ibf-ft )
CAMSHAF T
PULLE Y
10 x 1.2 5 mm69 N- m (7. 0 kgf-m , 5 1 Ibf-ft )Apply engin e oi l t o th ethreads .
4. Remov e th e crankshaf t spee d fluctuatio n (CKF ) sen -
sor.
CKFSENSO R
6 x 1. 0 m m12 N- m (1. 2 kgf-m ,
8. 7 Ibf-ft )
5. Disconnec t th e TDC/CKP/CY P senso r connecto r an d
CK F senso r connector .
6 . Remov e th e bac k cover , the n remov e th e TDC/CK P
sensor .
CKF SENSO R
CONNECTO R
TDC/CKP/CY P
SENSO R
CONNECTO R
TDC/CK P
SENSO R
6 x 1. 0 m m12 N- m (1. 2 kgf-m ,
8. 7 Ibf-ft )
BACKCOVE R
7. Instal l th e TDC/CKP/CYP/CK F senso r i n revers e orde r
of removal .
• Refe r t o pag e 6-1 1 whe n installin g th e timin g belt .
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Cylinder Head

Removal (cont'd)

17. Remove the spark plug wires, distributor and ground

cables from the cylinder head.

O-RING

Replace.
8 x
1.25
mm

18 N-m (1.8 kgf-m,

13 Ibf-ft)

DISTRIBUTOR

GROUND

CABLES

18. Remove the wire harness covers and positive crank-

case ventilation (PCV) hose.

6 x 1.0 mm

9.8 N-m (1.0 kgf-m,

7.2 Ibf-ft)

PCV HOSE

WIRE HARNESS

COVERS

6 x 1.0 mm

12 N-m (1.2 kgf-m, 8.7 Ibf-ft)
19. Remove the engine wire harness connectors and

wire harness clamps from the cylinder head and the

intake manifold.

• Five injector connectors

• TDC/CKP/CYP sensor connector

• CKF sensor connector

• Idle air control (IAC) valve connector

• Engine coolant temperature (ECT) sensor connec-

tor

• ECT gauge sending unit connector

• ECT switch connector

• Exhaust gas recirculation (EGR) valve lift sensor

connector

• Throttle position sensor connector

• Intake air bypass (IAB) control solenoid valve con-

nector

• Evaporative emission (EVAP) purge control sole-

noid valve connector

20. Remove the ground cable and water bypass hose.

GROUND

CABLE

6 x 1.0 mm

12 N-m (1.2 kgf-m, 8.7 Ibf-ft)

WATER BYPASS

HOSEProCarManuals.com

Cylinder Hea d
Remova l (cont'd )
26. Remov e th e tinnin g bel t (se e pag e 6-10 ).
27 . Remov e th e CY P sensor , the n remov e th e camshaf t
pulle y (se e pag e 6-13 ).
28 . Remov e th e CK F senso r (se e pag e 6-13 ).
29 . Remov e th e bac k cover , the n remov e th e TDC/CK P
senso r (se e pag e 6-13 ).
30 . Remov e th e cylinde r hea d bolts , the n remov e th e
cylinde r head .
CAUTION : T o preven t warpage , unscre w th e bolt s
i n sequenc e 1/ 3 tur n a t a time ; repea t th e sequenc e
unti l al l bolt s ar e loosened .
CYLINDE R HEA D BOLT S LOOSENIN G SEQUENCE :
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8. Instal l th e TDC/CK P sensor , the n instal l th e bac k cover .
BACK COVE R
Clean .
TDC/CK P
SENSO R
6 x 1. 0 m m12 N- m (1. 2 kgf-m , 8. 7 Ibf-ft )
9. Instal l th e camshaf t pulley , the n instal l th e CY P sen -
sor.
CY PSENSO R
6 x 1. 0 m m12 N- m (1. 2 kgf-m ,
8. 7 Ibf-ft )
CAMSHAF T
PULLEYClean.10 x 1.2 5 mm69 N- m (7. 0 kgf-m , 5 1 Ibf-ft )Apply engin e oi l t o th ethreads .
10. Instal l th e CK F sensor .
CKFSENSO R
6 x 1. 0 m m12 N- m (1. 2 kgf-m ,
8. 7 Ibf-ft )
11. Instal l th e timin g bel t (se e pag e 6-11 ).
12 . Adjus t th e valv e clearanc e (se e pag e 6-3 ).
13 . Instal l th e hea d cove r gaske t i n th e groov e o f th e
cylinde r hea d cover . Sea t th e recesse s fo r th e cam -
shaf t first , the n wor k i t int o th e groov e aroun d th e
outsid e edges .
NOTE:
• Befor e installin g th e hea d cove r gasket , thor -
oughl y clea n th e sea l an d th e groove .
• Whe n installing , mak e sur e th e hea d cove r gaske t
i s seate d securel y i n th e corner s o f th e recesse s
with n o gap .
CORNER S O F
HEA D COVE R TH E RECES S
GASKETClean.
CORNER S O F
TH E RECES S CYLINDE
R HEA DCOVE R
KEY
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