1996 ACURA RL KA9 ignition

Troubleshooting Precautions

ABS Indicator

1. If the system is OK, the ABS indicator goes off 2 seconds after turning the ignition switch ON (II) without starting the

engine, and then comes on again and goes off after 2 seconds. This occurs because the ABS control unit is turned on

by the IG2 power source.

2. The ABS indicator comes on when the ABS control unit detects a problem in the system. However, even though the

system is operating properly, the ABS indicator will come on, under the following conditions.

Only drive wheels rotate

One drive wheel is stuck

Vehicle spin

ABS continues to operate for a long time

Signal disturbance

To determine the actual cause of problem, question the customer about the problem, taking these conditions into con-

sideration.

3. When a problem is detected and the ABS indicator comes on, there are cases when the indicator stays on until the igni-

tion switch is turned OFF, and cases when the indicator goes off automatically when the system returns to normal. For

DTCs 61 and 62, the indicator goes off automatically when the system returns to normal. For all other codes, the indica-

tor stays on until the ignition switch is turned OFF.

4. For DTCs 12, 14, 16, 18, 21, 22, 23, 24, 51, 52 and 53, the indicator goes off when the vehicle is driven again and the sys-

tem is OK after the ignition switch is turned from OFF to ON (II). However, if the DTC is erased, the CPU is reset and the

indicator goes off right after the engine is started if the system is OK.

Diagnostic Trouble Code (DTC)

1. If the CPU cannot be activated and the indicator comes on, the DTC is not memorized.

2. The memory can hold any number of DTCs. However, when the same DTC is detected more than once, the later one is

written over the old one. Therefore, when the same problem is detected repeatedly, it is memorized as 1 DTC.

3. The DTCs are indicated in the order of ascending number, not in the order they occur.

4. The DTCs are memorized in the EEPROM (non-volatile memory). Therefore, the memorized DTCs cannot be canceled

by disconnecting the battery. Perform the specified procedures to erase the DTCs.

Self-diagnosis

1. Self-diagnosis can be classified into 2 categories.

• Initial diagnosis: Performed right after the engine starts and until the ABS indicator goes off.

• Regular diagnosis: Performed right after the initial diagnosis until the ignition switch is turned OFF.

2. When a problem is detected by self-diagnosis, the system.

Turns the fail-safe relay OFF

Turns the solenoid valve OFF

Turns the pump motor OFF

Turns the ABS indicator ONProCarManuals.com

TCS Control Unit Terminal Arrangement

TCS CONTROL UNIT 14P CONNECTOR

Wire side of female terminals

VB: Battery Voltage

Terminal

number

1

2

3

4

5

6

7

8

9

10

11

12

13

14
Wire

color

WHT/GRN

BLU/GRY

WHT/RED

BRN/BLK

GRY/BLK

RED

GRY/WHT

LT

GRN/RED

GRY

PNK/BLK

WHT/BLK

BLU/WHT

BRN/YEL

RED/BLK
Terminal sign

(Terminal name)

FRP

(Front right pulse)

WARN1

(Warning 1)

FLP

(Front left pulse)

LG1

(Logic ground 1)

RRP

(Rear right pulse)

TCV

( traction

control valve)

RLP

(Rear left pulse)

TC-INH

(Traction control

inhibit)

STR-B

(Steering B)

TC-STB

(Traction control

standby)

TC-SW

(Traction control

switch)

VREF

(Voltage

reference)

STR-A

(Steering A)

TPS

(Throttle posi-

tion sensor)
Description

Detects right-front

wheel sensor signal

Drives TCS indicator

light (The indicator light

comes on by the

self-bias)

Detects left-front wheel

sensor signal

Ground for the logic

circuit

Detects right-rear wheel

sensor signal

Detects TCS control

valve sensor signal

Detects left-rear wheel

sensor signal

Fl TCS, TCS opera-

tion permission signal

Detects steering angle

sensor signal B

TCS Fl, TCS opera-

tion start signal

Detects TCS switch

signal

Reference voltage for

the sensors of the

PGM-FI system

Detects steering angle

sensor signal A

Detects throttle position

sensor signal
Voltage

Measurement

terminals

1-GND

2-GND

3-GND

4-GND

5-GND

6-GND

7-GND

8-GND

9-GND

10-GND

11-GND

12-GND

13-GND

14-GND
Conditions

(Ignition Switch ON (ID)

Rotate the right-front

wheel.

Indicator light ON

Indicator light OFF

Rotate the left-front

wheel.

Rotate the right-rear

wheel.

TCS control valve is

fully closed.

TCS control valve is

fully open.

Rotate the right-rear

wheel.

Permission (normal)

Inhibition (the coolant

temperature is 0°C or

below)

Failure (TCS and/or

PCM is failure)

Rotate the steering

wheel.

TCS is functioning.

TCS is not functioning.

Push the TCS switch.

Release the TCS switch.

Rotate the steering

wheel.

Throttle valve is fully

closed.

Throttle valve is fully

open.
Output

voltage

About 2.5 V

About 2 V

VB

About 2.5 V

Below 0.3 V

About 2.5 V

About 0.5V

About 4.5 V

About 2.5 V

About 2.5V

(5 V. Duty 50)

About 5 V

About 0 V

5V 0V

0V

About 5 V

VB

0V

About 5 V

5V 0V

About 0.5 V

About 4.5 VProCarManuals.com

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