Subaru Legacy (2005 year). Service manual — part 768
ABS(diag)-37
ABS (DIAGNOSTICS)
ABS Warning Light / Brake Warning Light Illumination Pattern
Step
Check
Yes
No
1
CHECK INSTALLATION OF ABSCM&H/U
CONNECTOR.
1) Turn the ignition switch to OFF.
2) Check that the ABSCM&H/U connector is
inserted to ABSCM&H/U until the clamp locks
onto it.
Is the connector correctly
inserted?
Insert the
ABSCM&H/U con-
nector until the
clamp locks onto
it.
2
READ DTC.
Read the DTC. <Ref. to ABS(diag)-24, Read
Diagnostic Trouble Code (DTC).>
Is DTC displayed?
Perform the diag-
nosis according to
DTC.
3
CHECK THE BRAKE FLUID AMOUNT.
Check the amount of brake fluid in the reser-
voir tank of master cylinder.
Is the amount of brake fluid
between the lines of MAX and
MIN?
Replenish brake
fluid to the speci-
fied value.
4
CHECK BRAKE FLUID LEVEL SWITCH.
1) Disconnect the level switch connector (B16)
from master cylinder.
2) Measure the resistance of master cylinder
terminals.
Terminals
No. 1 — No. 2:
Is the resistance more than 1
M
Ω?
Replace the mas-
ter cylinder.
5
CHECK PARKING BRAKE SWITCH.
1) Disconnect the connector (R4) from park-
ing brake switch.
2) Release the parking brake.
3) Measure the resistance between parking
brake switch terminal and chassis ground.
Is the resistance more than 1
M
Ω?
Replace the park-
ing brake switch.
6
CHECK GROUND SHORT OF HARNESS.
1) Disconnect the connector (i10) from combi-
nation meter.
2) Measure the resistance between combina-
tion meter connector and chassis ground.
Connector & terminal
(i10) No. 8 — Chassis ground:
Is the resistance more than 1
M
Ω?
Repair the har-
ness connector
between combina-
tion meter and
parking brake
switch.
7
CHECK HARNESS.
1) Disconnect the connector (B301) from
ABSCM&H/U.
2) Disconnect the connector (i10) from the
combination meter.
3) Measure the resistance between
ABSCM&H/U connector and combination
meter connector.
Connector & terminal
(B301) No. 8 — (i10) No. 7:
Is the resistance less than 0.5
Ω?
Repair harness
between
ABSCM&H/U and
combination meter
connector.
8
CHECK POOR CONTACT IN CONNECTOR.
Check poor contact in all connectors.
Is there poor contact?
Repair the con-
nector.
9
CHECK ABSCM.
1) Connect the connector to the ABSCM&H/U.
2) Turn the ignition switch to ON.
3) Measure the resistance between combina-
tion meter connector and chassis ground.
Connector & terminal
(i10) No. 7 — Chassis ground:
Is the resistance less than 0.5
Ω?
Check the combi-
nation meter.
Replace the
ABSCM only.
<Ref. to ABS-8,
REPLACEMENT,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
ABS(diag)-38
ABS (DIAGNOSTICS)
List of Diagnostic Trouble Code (DTC)
11.List of Diagnostic Trouble Code (DTC)
A: LIST
DTC
Content of diagnosis
Display
Reference target
C0101
ABS wheel speed sen-
sor malfunction (Bro-
ken wire, short)
Rear ABS wheel
speed sensor RH
Rear Right ABS Sen-
sor Circuit Open or
Shorted Battery
C0102
Rear ABS wheel
speed sensor LH
Rear Left ABS Sensor
Circuit Open or
Shorted Battery
C0103
Front ABS wheel
speed sensor RH
Front Right ABS Sen-
sor Circuit Open or
Shorted Battery
C0104
Front ABS wheel
speed sensor LH
Front Left ABS Sensor
Circuit Open or
Shorted Battery
C0105
ABS wheel speed sen-
sor malfunction (ABS
wheel speed sensor
abnormal signal)
Abnormal signal of
rear ABS wheel speed
sensor RH
Rear Right ABS Sen-
sor Signal
C0106
Abnormal signal of
rear ABS wheel speed
sensor LH
Rear Left ABS Sensor
Signal
C0107
Abnormal signal of
front ABS wheel speed
sensor RH
Front Right ABS Sen-
sor Signal
C0108
Abnormal signal of
front ABS wheel speed
sensor LH
Front Left ABS Sensor
Signal
C0109
Power voltage malfunction
Power Supply Voltage
Failure
C0110
ABS control module malfunction
ECM
ABS(diag)-39
ABS (DIAGNOSTICS)
List of Diagnostic Trouble Code (DTC)
C0111
Motor/motor relay on failure
Motor and Motor Relay
C0114
Valve relay on failure
Valve Relay
C0115
ABS wheel speed sen-
sor malfunction (ABS
wheel speed sensor
abnormal signal)
Abnormal ABS wheel
speed sensor on any
one of four sensors
Any One of Four ABS
Sensors Signal
C0116
Stop light switch signal circuit malfunction
Brake Light Switch
C0118
Faulty G sensor output voltage
G Sensor Failure
C0119
Abnormal G sensor output voltage
G Sensor Signal
C0120
Inlet valve malfunction
in hydraulic unit
Front inlet valve LH
FL Hold Valve mal-
function
C0121
Outlet valve malfunc-
tion in hydraulic unit
Front outlet valve LH
FL Pressure Reducing
Valve malfunction
C0122
Inlet valve malfunction
in hydraulic unit
Front inlet valve RH
FR Hold Valve mal-
function
C0123
Outlet valve malfunc-
tion in hydraulic unit
Front outlet valve RH
FR Pressure Reducing
Valve malfunction
C0124
Inlet valve malfunction
in hydraulic unit
Rear inlet valve LH
RL Hold Valve mal-
function
C0125
Outlet valve malfunc-
tion in hydraulic unit
Rear outlet valve LH
RL Pressure Reduc-
ing Valve malfunction
DTC
Content of diagnosis
Display
Reference target
ABS(diag)-40
ABS (DIAGNOSTICS)
List of Diagnostic Trouble Code (DTC)
C0126
Inlet valve malfunction
in hydraulic unit
Rear inlet valve RH
RR Hold Valve mal-
function
C0127
Outlet valve malfunc-
tion in hydraulic unit
Rear outlet valve RH
RR Pressure Reduc-
ing Valve malfunction
C0140
CAN communication malfunction
Improper CAN com-
munication
DTC
Content of diagnosis
Display
Reference target
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