Subaru Legacy 2002 Service Manual page 1818

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
No.
6 CHECK HARNESS CONNECTOR
BETWEEN TCM AND THROTTLE POSITION
SENSOR.
Measure resistance of harness between TCM
and throttle position sensor connector.
Connector & terminal
Except 3.0 L model:
(B54) No. 2 — (E13) No. 4:
3.0 L model:
(B54) No. 2 — (E13) No. 3:
7 CHECK HARNESS CONNECTOR
BETWEEN TCM AND THROTTLE POSITION
SENSOR.
Measure resistance of harness between TCM
connector and chassis ground.
Connector & terminal
(B54) No. 3 — Chassis ground:
8 CHECK HARNESS CONNECTOR
BETWEEN TCM AND THROTTLE POSITION
SENSOR.
Measure resistance of harness between TCM
connector and chassis ground.
Connector & terminal
(B54) No. 2 — Chassis ground:
9 CHECK HARNESS CONNECTOR
BETWEEN TCM AND ECM.
Measure resistance of harness between TCM
and ECM connector.
Connector & terminal
Except 3.0 L model:
(B54) No. 3 — (B136) No. 17:
3.0 L model:
(B54) No. 3 — (B135) No. 7:
10 CHECK HARNESS CONNECTOR
BETWEEN TCM AND ECM.
Measure resistance of harness between TCM
and ECM connector.
Connector & terminal
Except 3.0 L model:
(B54) No. 2 — (B136) No. 15:
3.0 L model:
(B54) No. 2 — (B135) No. 9:
11 PREPARE SUBARU SELECT MONITOR.
12 CHECK INPUT SIGNAL FOR TCM.
1) Connect connectors to TCM, throttle posi-
tion sensor and ECM.
2) Turn ignition switch to ON (engine OFF).
3) Close the throttle completely.
4) Measure voltage between TCM connector
and chassis ground.
Connector & terminal
(B54) No. 3 (+) — Chassis ground (−):
13 CHECK INPUT SIGNAL FOR TCM.
1) Open the throttle completely.
2) Measure voltage between TCM connector
and chassis ground.
Connector & terminal
(B54) No. 3 (+) — Chassis ground (−):
Step
Is the resistance less than
1 Ω?
Is the resistance more than
1 MΩ?
Is the resistance more than
1 MΩ?
Is the resistance less than
1 Ω?
Is the resistance less than
1 Ω?
Do you have a Subaru
Select Monitor?
Is the voltage between 0.3
and 0.7 V in throttle fully
closed?
Is the voltage between 4.0
and 4.6 V with throttle fully
open?
AT-49
Automatic Transmission (Diagnostics)
Check Yes
Go to step 7.
Go to step 8.
Go to step 9.
Go to step 10.
Go to step 11.
Go to step 14.
Go to step 13.
Go to step 16.
No
Repair open cir-
cuit in harness
between TCM and
throttle position
sensor connector,
and poor contact
in coupling con-
nector.
Repair short cir-
cuit in harness
between TCM and
throttle position
sensor connector.
Repair short cir-
cuit in harness
between TCM and
throttle position
sensor connector.
Repair open cir-
cuit in harness
between TCM and
ECM connector.
Repair open cir-
cuit in harness
between TCM and
ECM connector.
Go to step 12.
Go to step 18.
Go to step 18.