ignition ACURA RL KA9 1996 Service Workshop Manual

TCS CONTROL UNIT 20P CONNECTOR

Wire side of female terminals

VB: Battery Voltage

Terminal

number

1

2

4

5

6

9

10

11

12

13

14

15

16

17

20
Wire

color

BLK/YEL

GRN/RED

BLU

PNK/BLU

BLK/WHT

BLK

BRN/WHT

GRN/WHT

BLU

GRN/ORN

BLK/ORN

BRN/BLK

WHT/BLU

BLU/GRY

GRN

BRN
Terminal sign

(Terminal name)

IG1

(Ignition 1)

PARK

(Parking)

SCS

(Service check

signal)

STR-GND

(Steering ground)

AT-SHIFT

(AT shift)

FSR

(Fail-safe relay)

PMG

(Power motor

Ground)

VPM

(Voltage power

motor)

STOP

(Stop)

NEP (Engine

speed pulse)

BARO

(Barometric)

TC-FC

(Traction control

fuel cut)

LG2

(Logic ground 2)

STR-VCC (Steer-

ing power supply)

WARN2

(Warning 2)

SH-MOT

(Shield motor)

MOT +

(Motor +)

MOT-

(Motor -)
Description

Detects ignition switch

IG1 signal

Detects parking brake

switch signal

Detects service check

connector signal

(Diagnostic trouble

code indication)

Ground for the steering

angle sensor

Detects A/T shift posi-

tion signal

Drives fail-safe relay

Power ground for the

TCS control valve

actuator motor

Power source for the

TCS control valve

actuator motor

Detects brake pedal

position switch signal

Detects engine speed

signal

Detects barometric

sensor signal

TCS Fl, Fuel cut

(torque down) signal

Ground for the logic

circuit

Power source for the

steering angle sensor

Drives TCS indicator light

(The indicator light comes

on by the self-bias)

Shield for the TCS con-

trol valve actuator motor

Drives TCS control

valve actuator motor

Drives TCS control

valve actuator motor
Measurement

terminals

1-GND

2

3-GND

4-GND

5-GND

6-GND

9-GND

10-GND

11-GND

12-GND

13-GND

14-GND

15-GND

16-GND

17-GND

19-20

20-19
Voltage

Conditions

(Ignition Switch ON (II))

Depress the parking

brake pedal.

Release the parking

brake pedal.

SCS service connector

connected.

SCS service connector

disconnected.

Shift the transmission

to position, then

start the engine.

Start the engine.

Start the engine.

Brake pedal depressed.

Brake pedal released.

Engine idling

TCS is functioning,

(maximum fuel cut)

TCS is not functioning.

Indicator light ON

Indicator light OFF

TCS is functioning.

TCS is not functioning.

TCS is functioning.

TCS is not functioning.
Output

voltage

VB

Below 0.6 V

VB

0V

5V

Below 0.3V

About 4V

(5V 0V)

VB

1.5V

Below 0.3 V

0V

VB

VB

0V

About 6V

(12V
0V)

About 3 V

About 1.5V

About 4.5 V

(5 V,
PWM)

Below 0.3V

About 5 V

About 2 V

VB

VB

0V

VB

0VProCarManuals.com

Diagnostic Trouble Code (DTC)

DTC Erasure

1. Press the parking brake pedal.

2. Push and hold the TCS switch, then turn the ignition switch ON (II).

3. Hold the TCS switch pushed for 4 to 6 seconds, then release the TCS switch.

4. After 3 seconds, the TCS indicator light should go off and blink 2 times, then stay on. This means that the DTC is

erased.

NOTE:

Always follow these steps exactly. If you connect the SCS service connector and/or release the parking brake pedal dur-

ing these steps, the DTC will not be erased.

If the TCS indicator light blinks repeatedly, replace the TCS control unit.

Standard Indication Pattern

Abnormal Indication Pattern

Light blinks repeatedlyProCarManuals.com

PGM-FI DTC: 36 [TC-FC signal (High-Low check)]

Check for a short to body ground

in the TC-FC circuit:

1. Disconnect the PCM connec-

tor C (12P) and TCS control

unit 20P connectors.

2. Check for continuity between

the TCS control unit 20P con-

nector terminal No. 14 and

body ground.
TCS CONTROL UNIT 20P CONNECTOR

Is there continuity?
Repair short to body ground in

the wire between the PCM and

TCS control unit.
Wire side of female terminals

TCS IS NOT TCS IS

FUNCTIONING FUNCTIONING

NOTE: Use the 10 V range or a similar

range in an analog tester.

Is there about 4.5 V when TCS is

not functioning?
Check for loose TCS control unit

connector. If necessary, substi-

tute a known-good TCS control

unit and recheck.

Check for an open in the TC-FC

circuit:

Measure the voltage between the

PCM connector C (12P) terminal

No. 10 and body ground.
NOTE: Use the 10 V range or a similar

range in an analog tester.
TCS IS NOT TCS IS

FUNCTIONING FUNCTIONING

PCM CONNECTOR C (12P)

Is there about 4.5 V when TCS is

not functioning?
Repair open in the wire between

the TCS control unit and PCM.

Wire side of female terminals

Check for loose PCM connectors.

If necessary, substitute a known-

good PCM and recheck.
Check the TCS control unit:

1. Connect the TCS control unit

20P connector.

2. Turn the ignition switch ON

(II).

3. Measure the voltage between

the TCS control unit 20P con-

nector terminal No. 14 and

body ground.ProCarManuals.com

Troubleshooting
Ignition Switc h (IG1 ) Signa l
Diagnosti c Troubl e Cod e (DTC ) 5-2 , 5-3 : Ignitio n Switc h (IG1 ) Signa l Diagnosi s
Th e TC S contro l uni t constantl y monitor s th e IG 1 voltage . Whe n th e uni t detect s IG 1 voltag e o f 12. 5 V or less , i t turn s o n
th e TC S indicato r ligh t an d th e DT C 5- 2 i s memorized . Whe n th e uni t detect s IG 1 voltag e o f 1 9 V or more , i t turn s o n th e
TC S indicato r ligh t an d th e DT C 5- 3 is memorized .
Possibl e cause s whic h rais e th e IG 1 voltag e to 1 9 V or more :
Fault y chargin g syste m
Excessiv e voltag e fro m a batter y charge r
Connectio n t o a 24 V batter y b y booste r cable s
Proble m verification :
Star t th e engine .
Does th e TC S indicato r ligh tcom e on ? Externa
l factor(s ) ca n b e th e
cause(s ) o f th e problem . As k th e
use r fo r th e conditio n whe n th e
sympto m appears .
Chec k th e chargin g syste m (se e
sectio n 4 ).
ProCarManuals.com

Terminal
number
23
2 4
25
2 6
27
2 8
2 9
30
3 1
3 2
33
3 6
38
39
4 0
4 1
42
Wir e
colo r
YEL/BL K
WHT
YEL
BLU
WHT/BL K
GRN/BLU
GRY
BLU/YE L
GRN/YE L
GRN/WH T
LT GRN /
RED
GRN/WH T
GRN/RED
YEL
PNK
BLK
GR N
Termina l
sign
IG2
CA N (+ )
PS M
PS S
VS A
OF F S W
FL S (+ )
RLS (- )
RR S (- )
RR S (+ )
STO P
VSA
BFL
PAR K
YRS A
YU
CA N ( - )
YRS S
PSU
Descriptio n
Power sourc e fo r activatin g th e
syste m
Communicatio n signa l
Groun d fo r th e pressur e senso r
Detect s pressur e senso r signa l
Detect s VS A of f switc h signa l
Detect s left-fron t whee l senso r signa l
Detect s left-rea r whee l senso r signa l
Detects right-rea r whee l senso r signa l
Detect s brak e peda l positio n switc h
signa l
Drive s VS A syste m indicato r
Detect s brak e flui d leve l switc h signa l
Detect s parkin g brak e switc h signa l
Powe r sourc e fo r th e ya w rate/latera l
acceleratio n senso r
Communicatio n signa l
Detect s ya w rat e senso r signa l
Powe r sourc e fo r th e pressur e senso r
Measuremen t (Wit h th e VS A contro l uni t 42 P
connecto r disconnected )
Terminals
23-GND
27-GN D
28-13
29-1 4
30-31
32-GN D
33-GND
36-GN D
38-GND
Condition s
Ignition switc h O N
(II)
Pres s th e VS A of f
switc h wit h th e igni -
tion switc h O N (II )
Whee l
Pres s th e brak e
peda l
Ignitio n switc h O N
(ID
Wit h th e igni -
tion switc h
ON (II) , the —— —
brake flui d
leve l i s
Wit h th e
ignitio n Presse d
switc h O N
(II) , park -
in g brak e Release d
peda l i s
Voltag e
Battery
Voltag e
Battery
Voltag e
AC: 0.05 3 V
o r abov e
Referenc e
Oscilloscop e
0.15 Vp- p or
abov e
Batter y
Voltag e
About 5 V
Batter y
Voltag e
0V
0 V
Batter y
Voltag e
ProCarManuals.com

Troubleshooting

Brake System Indicator Does Not Go Off

Check the ABS:

1. Turn the ignition switch.

2. Check the ABS indicator.

Does the ABS indicator stay on?
Perform the troubleshooting for

the
DTC.

Release the parking brake.

Does the brake system indica-

tor go off?
The system is OK at this time.

Check the brake fluid level.

Is the level OK?
Refill the brake fluid, then confirm

that the brake system indicator

goes off.

Check the VSA control unit:

1. Turn the ignition switch OFF.

2. Disconnect the VSA control

unit 42P connector.

3. Turn the ignition switch ON (II).

Does the brake system indica-

tor go off?
Replace the VSA modulator-

control unit.

Repair short to body ground in

the wire between the brake

system indicator and the VSA

control unit.

The parking brake switch stuck

ON.

The brake fluid level switch

stuck ON.ProCarManuals.com

VSA Activation Indicator Does Not Come On

Does the brake system indica-

tor come on?

Check the VSA activation indica-

tor:

1. Turn the ignition switch OFF.

2. Check the VSA activation indi-

cator bulb in the gauge assem-

bly.

Is the bulb OK?

Check the VSA control unit:

1. Disconnect the VSA control

unit 42P connector.

2. Turn the ignition switch ON (II).

3. Connect the VSA control unit

42P connector terminal No. 7

and body ground with a

jumper wire.

Does the VSA activation

indicator come on?

Check the gauge assembly:

Connect the gauge assembly 22P

connector terminal No. 2 and

body ground with a jumper wire.

Does the VSA activation

indicator come ON?

Repair open in the wire between

the gauge assembly and the VSA

control unit.
Gauge relay stuck OFF.

Blown METER (15 A) fuse in the

under-hood fuse/relay box.

Blown METER (7.5 A) fuse in

the under-dash fuse/relay box.

Repair open in the wire between

the METER (15 A) fuse and the

gauge assembly.

Repair open in the wire between

the METER (7.5 A) fuse and body

ground.

Replace the under-hood fuse/

relay box or under-dash fuse/

relay box. (Open circuit inside

the
box.)

Replace the VSA activation indi-

cator bulb.
VSA CONTROL UNIT 42P CONNECTOR

JUMPER

WIRE

Check for loose terminals in the

VSA control unit 42P connector.

If necessary, substitute a known-

good VSA modulator-control

unit, and recheck.

JUMPER

WIRE
Wire side of female terminals

GAUGE ASSEMBLY 22P CONNECTOR

Wire side of female terminals

Check for loose terminals in the

gauge assembly 22P connector.

If the connector is OK, replace

the printed circuit board in the

gauge assembly.ProCarManuals.com

Troubleshooting

VSA Activation Indicator Does Not Go Off

Check for a short to body ground

in the INFO circuit:

1. Disconnect the VSA control

unit 42P connector.

2. Turn the ignition switch ON (II).

Does the VSA activation

indicator go off?
Repair short to body ground in the

wire between the gauge assembly

and the VSA control unit.

Check for loose terminals in the

VSA control unit 42P connector.

If necessary, substitute a known-

good VSA modulator-control

unit, and recheck.ProCarManuals.com

DTC 11, 13, 15, 17: Wheel Sensor (Open/Short to Body Ground/Short to Power)

Check for a short to power in the

wheel sensor circuit:

1. Disconnect the VSA control

unit 42P connector.

2. Start the engine.

3. Measure the voltage between

the VSA control unit 42P con-

nector appropriate wheel sen-

sor (+) circuit terminal and

body ground (see table).
DTC

11 (Right-front)

13 (Left-front)

15 (Right-rear)

17 (Left-rear)
Appropriate Terminal

(+) Side

No. 16:FRS(+)

No. 28:FLS(+)

No. 31: RRS (+)

No.14: RLS(+)
(-) Side

No. 15: FRS(-)

No. 13:FLS (-)

No. 30:
RRS
(-)

No. 29: RLS (-)
VSA CONTROL UNIT 42P CONNECTOR

Is there battery voltage?
Repair short to power in the {+)

or (-) circuit wire between the

VSA control unit and appropriate

wheel sensor.
Wire side of female terminals

Check for a short to body ground

in the wheel sensor circuit:

1. Turn the ignition switch OFF.

2. Check for continuity between

the VSA control unit 42P con-

nector appropriate wheel sen-

sor (+) circuit terminal and

body ground (see table).

Is there continuity?
Repair short to body ground in

the (+) or (-) circuit wire between

the VSA control unit and the

appropriate wheel sensor.

Replace the appropriate wheel

sensor.

Check for an open in the wheel

sensor circuit:

Measure the resistance between

the VSA control unit 42P connector

appropriate wheel sensor (+) and

(-) circuit terminals (see table).

Is the resistance between

450 - 2,000 at 68°F?
• Repair open in the (+) or (-) cir-

cuit wire between the VSA con-

trol unit and the appropriate

wheel sensor.

• Replace the appropriate wheel

sensor.

Check for loose terminals in the

VSA control unit 42P connector.

If necessary, substitute a known-

good VSA modulator-control

unit, and recheck.ProCarManuals.com

Troubleshooting
DTC 27: Steering Angle Sensor
Perform the steering angle sen-
sor neutral position check proce-
dure (see page 19-268).
Is it OK?
Check the steering angle sensor
installation.
Is it correct?
Check for a short to power in the CAN circuit:
1. Disconnect the VSA control unit 42P connector, the steer-
ing angle sensor 4P connector
and the VSA converter unit
26P connector.2. Turn the ignition switch ON (II).
3. Measure the voltage between body ground and the VSA con-
trol unit 42P connector terminalNo. 24 and 40 individually.
Is there battery voltage?
Is there continuity?
Check for an open in the YRSA
YU circuit:
Check for continuity between the
VSA control unit 42P connector
terminal No. 39 and the steering angle sensor 4P connector termi-
nal No. 4.
Is there continuity?
(To page 19-229)
Perform the steering angle sen-
sor neutral position memorizing
procedure (see page 19-268).
Install the steering angle sensorcorrectly.
VSA CONTROL UNIT 42P CONNECTOR
Repair short to power in the wire
between the steering angle sen-
sor and the VSA control unit.
Wire side of female terminals
Repair short to body ground in
the wire between the steeringangle sensor and the VSA con-trol unit.
Repair open in the wire between
the steering angle sensor and the VSA control unit.STEERING ANGLE SENSOR4P CONNECTOR
Wire side of female terminals
Check for a short to body ground
in the CAN circuit:1. Turn the ignition switch OFF.
2. Check for continuity between body ground and the VSA con-
trol unit 42P connector terminal
No. 24 and 40 individually.
(RED/BLU)
ProCarManuals.com