Subaru IMPREZA GD 2007 Series Manual page 3070

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
D: DTC P1720 DCCD CAN SYSTEM CIRCUIT
DIAGNOSIS:
CAN communication circuit is open or shorted.
TROUBLE SYMPTOM:
• A tight corner braking phenomenon is occurred.
• ABS does not operate.
• ABS warning light comes on.
WIRING DIAGRAM:
DRIVER'S CONTROL
CENTER DIFFERENTIAL
CONTROL MODULE
ABSCM & H/U
Step
1 CHECK HARNESS CONNECTOR BETWEEN
DRIVER'S CONTROL CENTER DIFFEREN-
TIAL CONTROL MODULE AND ABSCM.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the driver's
control center differential control module and
ABSCM&H/U.
3) Measure resistance of the harness connec-
tor between the driver's control center differen-
tial control module and ABSCM&H/U.
Connector & terminal
(B380) No. 18 — (B301) No. 26:
(B380) No. 24 — (B301) No. 11:
2 CHECK HARNESS CONNECTOR BETWEEN
DRIVER'S CONTROL CENTER DIFFEREN-
TIAL CONTROL MODULE AND ABSCM.
1) Disconnect the connector from steering
angle sensor.
2) Measure the resistance between the
driver's control center differential control mod-
ule connector and chassis ground.
Connector & terminal
(B380) No. 18 — Chassis ground:
(B380) No. 24 — Chassis ground:
MANUAL TRANSMISSION AND DIFFERENTIAL (DIAGNOSTICS)
B380
1
2
B301
Is the resistance less than 1 Ω? Go to step 2.
Is the resistance 1 MΩ or
more?
6MT(diag)-35
STEERING
1 2 3 4
ANGLE SENSOR
10 11 12
B426
19 20 21
12 13 14
Check Yes
Go to step 3.
B426
1 2 3 4
B380
5 6 7 8 9
13 14 15 16 17 18
22 23 24
B301
1 2 3 4 5 6 7 8 9 10 11
15
16 17 18 19 20 21 22 23 24 25 26
MT-01868
No
Repair the open
circuit of the har-
ness between the
driver's control
center differential
control module and
ABSCM&H/U.
Repair the short
circuit of the har-
ness between the
driver's control
center differential
control module and
ABSCM&H/U.