Subaru Legacy (2005 year). Service manual — part 762
ABS(diag)-13
ABS (DIAGNOSTICS)
Control Module I/O Signal
NOTE:
• Terminal numbers in ABSCM&H/U connector are as shown in the figure.
• ABS warning light is illuminates when the connector is removed from ABSCM&H/U.
*1: Measure the I/O signal voltage after disconnecting the connector from the ABSCM&H/U terminal.
Description
Terminal
No.
(+) — (
−)
Input/Output signal
Measured value and measuring conditions
ABS wheel speed sen-
sor
(Wheel speed sensor)
Front LH wheel
Power
supply
16 — 15
4.5 — 16.5 V
Signal
1
5.9 — 16.8 mA: Rectangle waveform
Front RH wheel
Power
supply
5 — 15
4.5 — 16.5 V
Signal
6
5.9 — 16.8 mA: Rectangle waveform
Rear LH wheel
Power
supply
2 — 15
4.5 — 16.5 V
Signal
17
5.9 — 16.8 mA: Rectangle waveform
Rear RH wheel
Power
supply
3 — 15
4.5 — 16.5 V
Signal
4
5.9 — 16.8 mA: Rectangle waveform
CAN communication line (+)
26
2.5 — 1.5 V pulse signal
CAN communication line (
−)
11
3.5 — 2.5 V pulse signal
Valve relay power supply *1
14 — 15
10 — 15 V
Motor relay power supply *1
13 — 15
10 — 15 V
G sensor
Power supply
24 — 10
4.75 — 5.25 V
Ground
10
—
Output
21 — 10
2.1 — 2.5 V when the vehicle is on a level surface
Stop light switch *1
20 — 15
Less than 1.5 V when the stop light is OFF; otherwise,
10 — 15 V when the stop light is ON.
ABS warning light
22 — 15
After turning the ignition switch to ON, 10 — 15 V during
1.5 seconds and less than 1.5 V after 1.5 seconds
passed.
Brake warning light (EBD warning light)
8 — 15
After turning the ignition switch to ON, 10 — 15 V during
1.5 seconds and less than 1.5 V after 1.5 seconds
passed.
Subaru Select Monitor
7 — 15
Less than 1.5 V when no data is received.
0
←→ 12 V pulse (in communication)
Power supply *1
18 — 15
When the ignition switch is ON, 10 — 15 V.
Grounding line
15
—
Vehicle speed output signal
23 — 15
0
←→ 12 V pulse
ABS(diag)-14
ABS (DIAGNOSTICS)
Control Module I/O Signal
B: WIRING DIAGRAM
(1)
Battery
(12)
Rear inlet solenoid valve LH
(22)
Parking brake switch
(2)
Ignition switch
(13)
Rear outlet solenoid valve LH
(23)
Brake fluid level switch
(3)
ABS control module and hydraulic
control unit (ABSCM&H/U)
(14)
Rear inlet solenoid valve RH
(24)
Stop light switch
(15)
Rear outlet solenoid valve RH
(25)
Stop light
(4)
ABS control module
(16)
Body integrated module
(26)
G sensor
(5)
Valve relay
(17)
Engine control module (ECM)
(27)
Front ABS wheel speed sensor LH
(6)
Motor relay
(18)
Transmission control module
(TCM)
(28)
Front ABS wheel speed sensor
RH
(7)
Motor
(8)
Front inlet solenoid valve LH
(19)
Data link connector
(29)
Rear ABS wheel speed sensor LH
(9)
Front outlet solenoid valve LH
(20)
ABS warning light
(30)
Rear ABS wheel speed sensor
RH
(10)
Front inlet solenoid valve RH
(21)
Brake warning light
(11)
Front outlet solenoid valve RH
ABS00592
(3)
(7)
(8)
M
(9)
(10)
(19)
(20)
(2)
(4)
(5)
(6)
(1)
(21)
(22)
(24)
(25)
(26)
(27)
(11)
(12)
(13)
(14)
(15)
(28)
(29)
(30)
(23)
(16)
(17)
(18)
ABS(diag)-15
ABS (DIAGNOSTICS)
Subaru Select Monitor
6. Subaru Select Monitor
A: OPERATION
1. READ DIAGNOSTIC TROUBLE CODE
(DTC)
1) Prepare the Subaru Select Monitor kit. <Ref. to
ABS(diag)-9, SPECIAL TOOL, PREPARATION
TOOL, General Description.>
2) Connect the diagnosis cable to Subaru Select
Monitor.
3) Insert the cartridge to Subaru Select Monitor.
<Ref. to ABS(diag)-9, SPECIAL TOOL, PREPA-
RATION TOOL, General Description.>
4) Connect the Subaru Select Monitor to data link
connector.
(1) Data link connector is located in the lower
portion of the instrument panel (on the driver’s
side).
(2) Connect the diagnosis cable to data link
connector.
CAUTION:
Do not connect the scan tools except Subaru
Select Monitor.
5) Turn the ignition switch to ON (engine OFF) and
turn the Subaru Select Monitor power switch to ON.
6) On the «Main Menu» display screen, select the
{Each System Check} and press the [YES] key.
7) On the «System Selection Menu» display
screen, select the {Brake Control} and press the
[YES] key.
8) Press the [YES] key after the {ABS} is displayed.
9) On the «ABS Diagnosis» display screen, select
the {DTC Display} and press the [YES] key.
NOTE:
• For details concerning operation procedure, re-
fer to the SUBARU SELECT MONITOR OPERA-
TION MANUAL.
• For details concerning DTCs, refer to the “List of
Diagnostic Trouble Code (DTC)”. <Ref. to ABS(di-
ag)-38, List of Diagnostic Trouble Code (DTC).>
• DTCs are displayed up to three in detected or-
der.
• If a particular DTC is not properly stored in mem-
ory (due to a drop in ABSCM&H/U power supply,
etc.) on the occurrence of a problem, the DTC
which is suffixed with a question mark “?” appears
on the Subaru Select Monitor display. This shows it
may be an unreliable reading.
10) If ABS and Subaru Select Monitor cannot com-
municate, check the communication circuit. <Ref.
to ABS(diag)-18, COMMUNICATION FOR INI-
TIALIZING IMPOSSIBLE, INSPECTION, Subaru
Select Monitor.>
(1) Data link connector
ABS00111
ABS00112
ABS00465
(1)
(1) Power switch
ABS00114
(1)
ABS(diag)-16
ABS (DIAGNOSTICS)
Subaru Select Monitor
11) When DTC is not displayed, check the meter
circuit or CAN communication circuit. <Ref. to
ABS(diag)-20, WITHOUT DTC, INSPECTION,
Subaru Select Monitor.>
2. READ CURRENT DATA
1) On the «Main Menu» display screen, select the {Each System Check} and press the [YES] key.
2) On the «System Selection Menu» display screen, select the {Brake Control} and press the [YES] key.
3) Press the [YES] key after the {ABS} is displayed.
4) On the «Brake Control Diagnosis» screen, select the {Current Data Display/Save}, and then press the
[YES] key.
5) On the «Data Display Menu» screen, select the data display style and press the [YES] key.
6) Using a scroll key, move the display screen up or down until necessary data is shown.
• A list of the support data is shown in the following table.
NOTE:
For details concerning operation procedure, refer to the SUBARU SELECT MONITOR OPERATION MAN-
UAL.
Display
Contents to be monitored
Current
Indicate the latest DTC on the Subaru
Select Monitor display.
Old
Indicate the latest DTC in previous trou-
ble on the Subaru Select Monitor display.
Older
Indicate the latest DTC in second previ-
ous trouble on the Subaru Select Monitor
display.
Before 3
Indicate the latest DTC in third previous
trouble on the Subaru Select Monitor dis-
play.
Display
Contents to be monitored
Unit of measure
FR Wheel Speed
Wheel speed detected by front ABS wheel speed sensor RH is dis-
played.
km/h or MPH
FL Wheel Speed
Wheel speed detected by front ABS wheel speed sensor LH is dis-
played.
km/h or MPH
RR Wheel Speed
Wheel speed detected by rear ABS wheel speed sensor RH is dis-
played.
km/h or MPH
RL Wheel Speed
Wheel speed detected by rear ABS wheel speed sensor LH is dis-
played.
km/h or MPH
BLS Signal
Brake ON/OFF is displayed.
ON or OFF
G Sensor
Vehicle acceleration detected by analog G sensor is displayed.
m/s (m/s
2
)
Valve Relay Signal
Valve relay operation signal is displayed.
ON or OFF
ABS Warning Light
ON operation of the ABS warning light is displayed.
ON or OFF
EBD Warning Light
ON operation of the EBD warning light is displayed.
ON or OFF
Motor Relay Monitor
Motor relay monitor voltage is displayed.
V
IG power supply voltage
Voltage supplied to ABSCM&H/U is displayed.
V
ABS Control Flag
ABS control condition is displayed.
ON or OFF
ABS OK B Signal
ABS system normal/abnormal is displayed.
OK or NG
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