cruise control ACURA NSX 1997 Service Repair Manual

Troubleshooting

Engine Control Module Terminal Arrangement (cont'd)

ECM CONNECTOR F (26P)
Wire side of female terminals

NOTE: Standard battery voltage is 12 V.

*: M/T

Terminal

number

1

2

3

4

6

7

8

9

10

10*

11

12

13

14

15

16

17

18

19

20

21

22

24
Wire

color

YEL/WHT

GRN/WHT

BRN

RED

GRY

LT

GRN/BLK

LT

GRN/RED

LTGRN

BLU/ORN

BLU/ORN

BLU/BLK

YEL/RED

BLU/RED

YEL/WHT

GRN/WHT

GRN/WHT

RED/WHT

BLU

BLU/YEL

GRN/YEL

LT GRN/YEL

WHT/YEL

RED/BLU
Terminal name

VCC1

(SENSOR VOLTAGE)

SG1 (SENSOR GROUND)

IMO CODE (IMMOBILIZER

CODE)

FLR2 (FUEL PUMP RELAY 2)

BKSW2 (BRAKE SWITCH 2)

CCRESSW (CRUISE

CONTROL RESUME SWITCH)

CC SETSW (CRUISE

CONTROL SET SWITCH)

CC MSW (CRUISE

CONTROL MAIN SWITCH)

CC ATSSW (CRUISE

CONTROL A/T GEAR

POSITION SWITCH)

CC CLSW (CRUISE

CONTROL CLUTCH SWITCH)

CCIL (CRUISE CONTROL INDI-

CATOR LIGHT)

AP2 (ACCELERATOR

POSITION SENSOR CIRCUIT 2)

AP1 (ACCELERATOR

POSITION SENSOR CIRCUIT 1)

VCC3 (SENSOR VOLTAGE)

SG3 (SENSOR GROUND)

BKSW1 (BRAKE SWITCH 1)

MTSL (REVERSE LOCKOUT

RELAY OUT)

VREF (REFERENCE VOLTAGE)

VT SOLF (FRONT VTEC

SOLENOID VALVE)

VT SOLR (REAR VTEC

SOLENOID VALVE)

ATSDL B (A/T Fl DATA LINE B)

ATSDL (A/T Fl. DATA LINE A)

TCSSDL (TCS DATA LINE)
Description

Provides sensor voltage

Sensor ground

Detects immobilizer signal

Drives fuel pump relay

Detects brake switch 2 signal

Detects resume switch signal

Detects set switch signal

Power source for the cruise

control system

Detects A/T gear position switch

signal

Detects clutch switch signal

Drives cruise control indicator

light

Detects accelerator position

sensor circuit 2 signal

Detects accelerator position

sensor circuit 1 signal

Provides sensor voltage

Sensor ground

Detects brake switch 1 signal

Drives reverse lockout relay

Provides reference voltage to

TCM

Drives front VTEC solenoid

valve

Drives rear VTEC solenoid valve

Detects data from the TCM

Sends data to the TCM

Interface for TCS control unit
Signal

With ignition switch ON (II): about 5 V

With ignition switch OFF: 0 V

With engine at low rpm: battery voltage

With engine at high rpm: 0 V

With brake pedal released and cruise

control main switch ON: battery voltage

With brake pedal depressed: 0 V

With resume switch released: 0 V

With resume switch depressed: battery

voltage

With set switch released: 0 V

With set switch depressed: battery

voltage

With cruise control main switch ON:

battery voltage

With cruise control main switch OFF: 0 V

In , or position: 0 V

In any other position: approx. 8 V

With clutch pedal released: approx. 8 V

With clutch pedal depressed: 0 V

With cruise control ON: 0 V

With cruise control OFF: battery voltage

With accelerator fully open: about 4.5 V

With accelerator fully closed: about 0.5 V

With accelerator fully open: about 4.5 V

With accelerator fully closed: about 0.5 V

With ignition switch ON (II): about 5 V

With ignition switch OFF: 0 V

With brake pedal released: 0 V

With brake pedal depressed: battery

voltage

With vehicle speed above 13 mph

(20 km/h): 0 V

With vehicle speed below 9 mph

(15 km/h): battery voltage

With ignition switch ON (II): about 5 V

With ignition switch OFF: 0 V

With engine at low rpm: 0 V

With engine at high rpm: battery voltage

With engine at low rpm: 0 V

With engine at high rpm: battery voltage

With engine running: pulses

With engine running: pulses

With engine running: pulsesProCarManuals.com

Drive By Wire System

System Description (cont'd)

Cruise Control Function

The ECM controls the throttle valve control motor to maintain the set speed when the cruise control system is operating.

The throttle valve control motor takes the place of the cruise control actuator.

Traction Control System (TCS) Function

If wheel spin occurs during acceleration or cornering, the TCS control unit requests the ECM to reduce the engine power

by retarding the ignition timing and closing the throttle valve. If the wheels lock during deceleration, the TCS control unit

signals the ECM to open the throttle valve.

Engine Protection Function

When the engine speed exceeds 8,000 rpm (M/T) or 7,500 rpm (A/T), the ECM controls the throttle valve, regardless of the

accelerator position, to protect the engine from over-revving.

Fail-safe Function

On this system, the ECM monitors the position of the accelerator pedal with a dual circuit type accelerator position sensor,

and monitors the operation of the throttle valve control motor with a Throttle Position (TP) sensor.

When an abnormality occurs in the system, the ECM restricts the operation of the throttle valve control motor to allow the

engine to continue to run.ProCarManuals.com

Steering Wheel

Removal (cont'd)

7. Disconnect the connectors from the horn and cruise

control set/resume switches, then remove the cable

reel 3P connector from its clips.
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.ProCarManuals.com

4. Connect the horn connector.
Installation

NOTE: Before installing the steering wheel, make sure

the front wheels are straight ahead.

CAUTION:

• 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 to prop-

erly install the airbag. (Use only genuine Honda

replacement parts.)

• 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, adjust the tie-rods only. Do not remove and

reposition the steering wheel.

Confirm that the driver's airbag assembly

is securely attached to the steering wheel; otherwise,

severe personal injury could result during later airbag

deployment.

1. Before installing the steering wheel, center the

cable reel.

Do this by first rotating the cable reel clockwise

until 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.
2. Install the steering wheel.

NOTE: Be sure the steering wheel shaft engages

the cable reel.

3. Attach the cruise control set/resume switches 4P

connector to the steering wheel clips.ProCarManuals.com

Cruise Contro l
Descriptio n
The cruis e contro l syste m use s mechanicall y an d electri -
call y operate d device s t o maintai n vehicl e spee d a t a
settin g selecte d b y th e driver .
Th e EC M receive s comman d signals from th e cruis e con -
trol mai n switc h an d th e cruis e contro l set/resum e switch.
I t receive s informatio n abou t operatin g condition s fro m
th e brak e switch , vehicl e spee d senso r (VSS) , th e clutc h
switch (wit h manua l transmission) , o r th e A/ T gea r posi -
tio n switc h (wit h automati c transmission) . Th e EC M
send s operationa l signal s t o th e device s tha t regulat e th e
throttl e position . Th e throttl e positio n maintain s th e
selecte d vehicl e speed . Essentially , th e EC M compare s
th e actua l spee d of the vehicl e t o th e selecte d speed .
Then , i t use s th e resul t of tha t compariso n t o ope n o r
clos e th e throttle .
Th e brak e switc h release s th e system' s contro l o f th e
throttl e a t th e instan t th e drive r depresse s th e brak e
pedal . Th e switc h send s a n electroni c signa l t o th e EC M
whe n th e brak e peda l i s depressed ; th e EC M respond s
b y allowin g th e throttl e t o close . Th e clutc h switc h (man -
ual transmission ) o r th e A/ T gea r positio n switc h (auto -
mati c transmission ) send s a disengag e signa l t o th e
EC M tha t als o allow s th e throttl e t o close . Operation
:
Th e cruis e contro l syste m wil l se t an d automaticall y
maintai n an y spee d abov e 2 5 mp h (4 5 km/h) . T o set ,
mak e sur e tha t th e mai n switc h i s i n th e "ON " position .
Afte r reachin g th e desire d speed , pres s th e se t switch .
Th e EC M wil l receiv e a se t signa l and , i n turn , wil l actu -
at e th e throttl e valv e contro l motor . Whe n th e se t switc h
i s depresse d an d th e cruis e contro l syste m is on , th e
"cruis e control " O N indicato r i n th e gaug e assembl y wil l
ligh t up . Yo u ca n cance l th e cruis e contro l syste m b y
pushin g th e mai n switc h t o "OFF" . Thi s erase s th e se t
spee d fro m memory . I f th e syste m is disengage d tem -
poraril y b y th e brak e switch , clutc h switch , o r A/ T gea r
positio n switc h an d vehicl e spee d i s stil l abov e 2 5 mph ,
pres s th e resum e switch . Wit h th e resum e switc h
depresse d an d th e se t memor y retained , th e vehicl e
automaticall y return s t o th e previou s se t speed .
Fo r gradua l acceleratio n withou t depressin g th e acceler -
ato r pedal , pus h th e resum e switc h dow n an d hol d i t
ther e unti l th e desire d spee d i s reached . Thi s wil l sen d
a n acceleratio n signa l t o th e ECM . Whe n th e switc h i s
released , th e syste m wil l b e reprogramme d fo r th e ne w
speed . T o slo w down , depres s th e se t switch . Thi s wil l
sen d a deceleratio n signa l t o th e EC M causin g th e ca r t o
coas t unti l th e desire d spee d i s reached . Whe n th e
desire d spee d i s reached , releas e th e se t switch . Thi s
wil l reprogra m th e syste m fo r th e ne w speed .
ProCarManuals.com

Cruise Contro l
Control Uni t Inpu t Tes t (cont'd )
WireTes t conditio n Test: Desire d resul t Possible caus e if resul t i s no t obtaine d
BLKUnde r al l condition sCheck fo r continuit y t o ground :
Ther e shoul d b e continuity . •
Poo r groun d (G101 )
• A n ope n i n th e wir e
YEL/BL KIgnition switc h O N (II )Chec k fo r voltag e t o ground :
Ther e shoul d b e batter y voltage . •
Blow n No . 1 8 (2 0 A ) fus e
• A n ope n i n th e wir e
LTGR N
Ignition switc h O N (II )
an d contro l switc h O N Chec
k fo r voltag e t o ground :
Ther e shoul d b e batter y voltage . •
Blow n No . 5 (1 5 A ) fus e
• Fault y contro l switc h
• A n ope n i n th e wir e
LT GRN /
BLKRESUM E butto n pushe d
LT GRN /
RED
SET butto n pushe d
Groun d eac h terminal :
Horn s shoul d soun d a s th e switc h i s
pushed . •
Blow n No . 4 5 (2 0 A ) fus e
• Fault y SET/RESUM E switc h
• Fault y cabl e ree l
• A n ope n i n th e wir e
BLU/OR N
M/T: Clutc h peda l
release d
A/T: Shif t leve r i n
o r
Chec k fo r continuit y t o ground :
Ther e shoul d b e continuity . •
Fault y o r misadjuste d clutc h switc h
(M/T)
• Fault y A/ T gea r positio n switc h (A/T )
• Poo r groun d (G401 , G402 , G403 )
• A n ope n i n th e wir e
ORN
Ignitio n switc h O N (II )
an d mai n switc h ON ;
raise th e rea r o f th e car ,
and rotat e on e whee l
slowly . Chec
k fo r voltag e betwee n th e
YEL/RE D an d BL K terminals :
Ther e shoul d b e 0 - 5 V or mor e -
0 - 5 V or mor e repeatedly . •
Fault y vehicl e spee d senso r (VSS )
• A n ope n i n th e wir e
GRY
Ignitio n switc h O N (II) ,
mai n switc h ON ; brak e
peda l pushed , the n
release d
Check fo r voltag e t o ground :
Ther e shoul d b e 0 V wit h th e peda l
pushe d an d batter y voltag e wit h th e
peda l released . •
Fault y brak e switc h
• A n ope n i n th e wir e
GRN/WH T
Brake peda l pushed ,
the n release d Chec
k fo r voltag e t o ground :
Ther e shoul d b e batter y voltag e wit h
th e peda l pushed , an d 0 V wit h th e
peda l released . •
Fault y brak e switc h
• A n ope n i n th e wir e
Ignitio n switc h O N (II )
BLU/BL K
Attach t o ground : Th e indicato r ligh t
i n th e gaug e assembl y shoul d com e
on.
• Blow n bul b
• Blow n No . 5 (1 5 A ) fus e
• Fault y dimmin g circui t i n th e gaug e
assembl y
• A n ope n i n th e wir e
ProCarManuals.com

Main Switch Replacement (cont'd)
Cruise Control

5. Disconnect the 20P, 4P and 5P connectors from the

floor wire harness.

CAUTION: Be careful not to damage the SRS wire

harness.

6. Remove the six screws, then remove the windshield

wiper-cruise control switch assembly.

7. If necessary, replace the cruise control switch bulbs.ProCarManuals.com

6. Disconnect the connector between the cable reel

and SRS main harness.

7. Remove the driver's airbag assembly from the

steering wheel, then remove the steering wheel

nut.

STEERING WHEEL NUT

TORX BOLT

Use a Torx T30 bit
DRIVER'S

AIRBAG ASSEMBLY

8. Disconnect the connectors from the horn and

cruise control set/resume switches, then remove

the cable reel 3P connector from its clips.

CRUISE CONTROL

SET/RESUME SWITCH

CONNECTOR

HORN

CONNECTOR

CABLE REEL

3P CONNECTOR
9. Remove the steering wheel from the column.

10. Remove the cable reel and cancel sleeve.

CABLE REEL

CANCEL SLEEVEProCarManuals.com

Supplemental Restraint System (SRS)

Cable Reel Installation

CAUTION:

Before installing the steering wheel, the front wheels

should be aligned straight ahead.

Be sure to install the harness wires so that they are

not pinched or interfering with other car parts.

After reassembly, confirm that the wheels are still

turned straight ahead and that steering wheel spoke

angle is correct. If minor spoke angle adjustment is

necessary, do so only by adjusting the tie-rods, not

by removing and repositioning the steering wheel.

1. Align the cancel sleeve grooves with the cable reel

projections.

CANCEL SLEEVE

CABLE REEL

GROOVES

PROJECTIONS

2. Carefully install the cable reel and the cancel sleeve

on the steering column shaft.

CABLE REEL

CANCEL SLEEVE

STEERING COLUMN

SHAFT
3. Install the column covers.

4. Center the cable reel.

Do this by first rotating the cable reel clockwise un-

til it stops.

Then rotate it counterclockwise (approximately

two turns) until:

The yellow gear tooth lines up with the align-

ment mark on the cover.

The arrow mark on the cable reel label points

straight up.

ARROW MARK

CABLE REEL LABEL

ALIGNMENT MARK

YELLOW GEAR TOOTH

5. Install the steering wheel, and attach the cable reel

3-P connector to the steering wheel clips.

6. Connect the horn connector and cruise control

connector.

CRUISE CONTROL

SET/RESUME

SWITCH CONNECTOR

HORN

CONNECTOR

CABLE REEL

3P CONNECTORProCarManuals.com