Subaru IMPREZA 2001 - Page 35

ABS-34
ABS (DIAGNOSTICS)
DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
Step Check Yes No
1 CHECK INSTALLATION OF ABSCM&H/U
CONNECTOR.
Turn ignition switch to OFF.
Is ABSCM&H/U connector
inserted into ABSCM until the
clamp locks onto it?
Go to step
2.
Insert ABSCM&H/
U connector into
ABSCM&H/U until
the clamp locks
onto it.
2 CHECK DIAGNOSIS TERMINAL.
Measure resistance between diagnosis termi-
nals (B81) and chassis ground.
Terminals
Diagnosis terminal (A) — Chassis
ground:
Diagnosis terminal (B) — Chassis
ground:
Is the resistance less than 0.5
Ω
?
Go to step
3.
Repair diagnosis
terminal harness.
3 CHECK DIAGNOSIS LINE.
1)Turn ignition switch to OFF.
2)Connect diagnosis terminal (B81) to diagno-
sis connector (B82) No. 6.
3)Disconnect connector from ABSCM&H/U.
4)Measure resistance between ABSCM&H/U
connector and chassis ground.
Connector & terminal
(F49) No. 4 — Chassis ground:
Is the resistance less than 0.5
Ω
?
Go to step
4.
Repair harness
connector
between
ABSCM&H/U and
diagnosis connec-
tor.
4 CHECK GENERATOR.
1)Start the engine.
2)Idle the engine.
3)Measure voltage between generator and
chassis ground.
Terminal
Generator B terminal (+) — Chassis
ground (
−
−−
− ):
Is the voltage between 10 and
15 V?
Go to step
5.
Repair generator.
<Ref. to SC-12,
Generator.>
5 CHECK BATTERY TERMINAL.
Turn ignition switch to OFF.
Is there poor contact at battery
terminal?
Repair battery ter-
minal.
Go to step
6.
6 CHECK POWER SUPPLY OF ABSCM.
1)Disconnect connector from ABSCM&H/U.
2)Start engine.
3)Idle the engine.
4)Measure voltage between ABSCM&H/U con-
nector and chassis ground.
Connector & terminal
(F49) No. 1 (+) — Chassis ground ( −
−−
− ):
Is the voltage between 10 and
15 V?
Go to step
7.
Repair
ABSCM&H/U
power supply cir-
cuit.
7 CHECK WIRING HARNESS.
1)Disconnect connector (F74) from connector
(B200).
2)Turn ignition switch to ON.
Does the ABS warning light
remain off?
Go to step
8.
Repair front wiring
harness.
8 CHECK PROJECTION AT ABSCM&H/U.
1)Turn ignition switch to OFF.
2)Check for broken projection at the
ABSCM&H/U terminal.
Are the projection broken? Go to step
9.
Replace
ABSCM&H/U.
<Ref. to ABS-7,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
9 CHECK ABSCM&H/U.
Measure resistance between ABSCM&H/U ter-
minals.
Terminal
No. 22 — No. 23:
Is the resistance more than 1
M
Ω
?
Go to step
10.
Replace
ABSCM&H/U.
<Ref. to ABS-7,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>