high voltage SUBARU LEGACY 1997 Service User Guide

4. CONDITIONS FOR ABS SEQUENCE CONTROL
B4M1001A
NOTE:

When select monitor is used, control operation starts at
point A. The patterns from IGN key ON to the point A show
that operation is started by diagnosis connector.

HIGH means high voltage.

LOW means low voltage.
129
4-4SERVICE PROCEDURE
22. ABS Control Module and Hydraulic Control Unit (ABSCM&H/U) (ABS 5.3i Type)

B6M0417A
3) Return test
Connect two battery negative leads onto terminal 50 and
onto switch body respectively. Then connect battery posi-
tive lead onto terminal C. Next, disconnect lead from ter-
minal 50. Pinion should return immediately.
2. PERFORMANCE TEST
The starter is required to produce a large torque and high
rotating speed, but these starter characteristics vary with
the capacity of the battery. It is therefore important to use
a battery with the specified capacity whenever testing the
starter.
The starter should be checked for the following three items:
1. No-load test
Measure the maximum rotating speed and current under a
no-load state.
2. Load test
Measure the magnitude of current needed to generate the
specified torque and rotating speed.
3. Stall test
Measure the torque and current when the armature is
locked.
B6M0418A
1) No-load test
Run single starter under no-load state, and measure its
rotating speed, voltage, and current, using the specified
battery. Measured values must meet the following stan-
dards:
No-load test (Standard):
Voltage/Current
11 V/90 A, or more
Rotating speed
TN128000-8311: 3,000 rpm, or more
TN128000-8321: 3,350 rpm, or more
8
6-1SERVICE PROCEDURE
1. Starter

B6M0419A
2) Load test (For reference)
Perform this test to check maximum output of starter. Use
test bench which is able to apply load (brake) to starter.
Measure torque value and rotating speed under the speci-
fied voltage and current conditions while controlling brak-
ing force applied to starter.
CAUTION:
Change engagement position of overrunning clutch
and make sure it is not slipping.
Load test (Standard):
TN128000-8311
Voltage/Load
8 V/9.8 N⋅m (1.0 kg-m, 7.2 ft-lb)
Current/Speed
280 A max./900 rpm min.
TN128000-8321
Voltage/Load
8 V/13.7 N⋅m (1.4 kg-m, 10.1 ft-lb)
Current/Speed
370 A, or less/880 rpm, or more
B6M0420A
3) Stall test
Using the same test equipment used for load test, apply
brake to lock starter armature. Then measure voltage,
current, and torque values.
Measured values must meet the following standard.
Stall test (Standard):
TN128000-8311
Voltage/Current
5 V/800 A, or less
Torque
27.5 N⋅m (2.8 kg-m, 20.3 ft-lb) min.
TN128000-8321
Voltage/Current
5 V/1,050 A, or less
Torque
27.5 N⋅m (2.8 kg-m, 20.3 ft-lb) min.
NOTE:
Low rotating speed or excessive current during no-load test
may be attributable to high rotating resistance of starter
due to improper assembling.
Small current and no torque during stall test may be attrib-
utable to excessive contact resistance between brush and
commutator; whereas, normal current and insufficient
torque may be attributable to shorted commutator or poor
insulation.
Starter can be considered normal if it passes no-load and
stall tests; therefore, load test may be omitted.
9
6-1SERVICE PROCEDURE
1. Starter

B6M0489A
1) Diodes on“+”side
Continuity of proper diodes on“+”side
BAT side
(+) ()
Terminal
N, U, V and W
(+)—Continuity must
not exist.
()Continuity
must exist.—
B6M0490A
2) Diodes on“”side
Continuity of proper diodes on“”side
“E”side
(+) ()
Terminal
N, U, V and W
(+)—Continuity must
exist.
()Continuity
must not exist.—
CAUTION:
Never use a high tension insulation tester, such as a
meggar as it will damage diodes with its high tension.
B6M0491A
5. IC REGULATOR
1) Compose a circuit diagram as shown in figure.


1Voltage meter: 0 to 30 V


2Switch 1


3Variable DC power supply: Variable 0 to 20 V, 1 A or
more


4Lamp 2


5Lamp 1


6Switch 3


7Switch 2


8Plus generator: Power supply 5 to 30 V, 1 kHz
21
6-1SERVICE PROCEDURE
2. Generator

B6M0163
2. WIPER MOTOR
1) Check wiper motor operation at low speed.
Connect battery to wiper motor. Check wiper motor for
proper operation at low speed.
B6M0164
2) Check wiper motor operation at high speed.
Connect battery to wiper motor. Check wiper motor for
proper operation at high speed.
B6M0165
3) Check wiper motor for proper stoppage.
Connect battery to wiper motor. After operating wiper motor
at low speed, disconnect battery to stop it.
B6M0166
4) Reconnect battery and ensure that wiper motor stops at
“AUTO STOP”after operating at low speed.
B6M0111
3. WASHER MOTOR
Apply battery voltage between terminals of washer motor
connector and check that washer motor operates.
27
6-2SERVICE PROCEDURE
10. Front Wiper and Washer

6. CLEAR/RESET EMISSION-RELATED DIAGNOSTIC
INFORMATION (MODE $04)
Refers to the mode used to clear or reset emission-related
diagnostic information (OBD-II trouble diagnostic informa-
tion).
NOTE:
Refer to OBD-II general scan tool manufacturer’s instruc-
tion manual to clear or reset emission-related diagnostic
information (MODE $04).
7. OXYGEN SENSOR MONITORING TEST RESULTS
(MODE $05)
Refers to the mode using oxygen sensor output data while
the on-board diagnosis system is performing diagnosis on
the oxygen sensor.
A list of the support oxygen sensor output data and test ID
(identification) are shown in the following table.
Test ID DataUnit of measure
01 Rich to lean sensor threshold voltage (constant) V
02 Lean to rich sensor threshold voltage (constant) V
03 Low sensor voltage for switch time calculation (constant) V
04 High sensor voltage for switch time calculation (constant) V
05 Rich to lean sensor switch time (calculated) sec.
06 Lean to rich sensor switch time (calculated) sec.
07 Minimum sensor voltage for test cycle (calculated) V
08 Maximum sensor voltage for test cycle (calculated) V
NOTE:
Refer to OBD-II general scan tool manufacturer’s instruc-
tion manual to access oxygen sensor monitoring test
results (MODE $05).
35
2-7ON-BOARD DIAGNOSTICS II SYSTEM
3. Diagnosis System

3. LIST OF ABS/TCS ON-BOARD DIAGNOSTICS
FUNCTIONS
Trouble codeDiagnostic items
Detection timingIndicator
light ON
Parts concerned
At initial checking
Under no control
Under ABS control
Under TCS control
In diagnostic mode
ABS warning light
TCS warning light
TCS OFF indicator light
21 FR
23 FL
25 RR
27 RLDetection of fault in ABS sensor hardware

 —ABS sensor (ABS/TCS C/M)
22 FR
24 FL
26 RR
28 RLDetection of fault in ABS sensor software
 —ABS sensor (ABS/TCS C/M)
 —ABS sensor harness circuit (ABS/TCS C/M)
Detection of fault in ABS sensor software
—ABS sensor and solenoid valve (ABS/TCS C/M)
—ABS sensor (ABS/TCS C/M)
Detection of fault in sensor software
 —ABS sensor (ABS/TCS C/M)
31 FRI
32 FRO
33 FLI
34 FLO
35 RRI
36 RRO
37 RLI
38 RLO
61 TCS1
62 TCS2Abnormal valve

*
—Solenoid valve (ABS/TCS C/M)
41 Abnormal ABS/TCS C/M
 —ABS/TCS C/M
42 Abnormal line voltage
—Power source operating environment (ABS/TCS C/M)
—Power source voltage drop
 —
—
*: Except when trouble code is being displayed.
10
4-4bBRAKES
5. Control Module I/O Signal

8. Diagnostics Chart with Trouble Code
A: LIST OF TROUBLE CODE
Trouble code Contents of diagnosis Ref. to 4-4b
11Start code

Trouble code is shown after start code.

Only start code is shown in normal condition.—
21
Faulty ABS sensor
(Open circuit or short circuit)Front right wheel speed sensor
[T8B0] 23 Front left wheel speed sensor
25 Rear right wheel speed sensor
27 Rear left wheel speed sensor
22
Faulty ABS sensor
(Faulty ABS sensor signal)Front right wheel speed sensor
[T8C0] 24 Front left wheel speed sensor
26 Rear right wheel speed sensor
28 Rear left wheel speed sensor
31
Faulty solenoid valve circuit(s) in hydraulic
unitFront right inlet valve [T8D0]
32 Front right outlet valve [T8E0]
33 Front left inlet valve [T8D0]
34 Front left outlet valve [T8E0]
35 Rear right inlet valve [T8D0]
36 Rear right outlet valve [T8E0]
37 Rear left inlet valve [T8D0]
38 Rear left outlet valve [T8E0]
41 Faulty ABS/TCS control module [T8F0]
42 Source voltage is high.[T8G0]
43 Faulty engine control module communication cables [T8H0]
51 Faulty valve relay[T8I0]
52 Faulty motor, motor sensor and/or motor relay [T8J0]
54 Faulty stroke sensor and/or stop light switch [T8K0]
57 Faulty fluid level sensor[T8L0]
58 Faulty pressure switch[T8M0]
61
Faulty solenoid valve circuit(s) in hydraulic
unitTCS 1 valve [T8D0]
62 TCS 2 valve [T8D0]
35
4-4bBRAKES
8. Diagnostics Chart with Trouble Code

G: TROUBLE CODE 42
—SOURCE VOLTAGE IS HIGH.—
DIAGNOSIS:

Power source voltage of the ABS/TCS control module is
more than 18 V.

Faulty ABS/TCS control module

Faulty harness/connector
TROUBLE SYMPTOM:

ABS does not operate.

TCS does not operate.
1. Check generator.
OK
Not OK
Repair generator.
2. Check battery terminal.
OK
Not OK
Repair battery terminal.
3. Check input voltage of ABS/TCS control mod-
ule.
OK
Not OK
Repair harness/connector.
4. Check ground circuit of ABS/TCS control
module.
OK
Not OK
Repair harness/connector.
Replace ABS/TCS control module.
B4M0429




55
4-4bBRAKES
8. Diagnostics Chart with Trouble Code

B4M0433
B4M0727A
1. CHECK COMMUNICATION CABLES.
1) Operate the TCS sequence control.

2) Measure the voltage between ABS/TCS control module
and the body during the TCS check sequence operation.
Connector & terminal:
(P6) No. 12—body (AET communication cable)
(P6) No. 5—body (AEB communication cable)
(P6) No. 14—body (AEC communication cable)
Specified voltage:
High voltage: 4—5.4 V
Low voltage:2Vorless
Check that each of the above voltage reading
are displayed.
58
4-4bBRAKES
8. Diagnostics Chart with Trouble Code