Subaru Impreza 2003 Service Manual page 1286

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
• RHD model
E21
1 2 3
Step
1 CHECK INPUT SIGNAL FOR ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(B135) No. 9 (+) — Chassis ground ( − − − − ):
2 CHECK INPUT SIGNAL FOR ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(B135) No. 9 (+) — Chassis ground ( − − − − ):
THROTTLE BODY
MANIFOLD
ABSOLUTE
PRESSURE
SENSOR
3
1
B83
B135 ECM
B83
1 2 3 4 5 6
5
13
Is the voltage more than 4.5 V? Go to step 3.
Shake the ECM harness and
connector, while monitoring
value of voltage meter. Does
the voltage change?
EN(H4DOTC)-110
E21
E2
B21
B21
1 2 3 4
1 2
6 7 8
10 11 12 13 14 15
9 10 11 12
20 21
14 15 16
17 18 19 20
Check
Repair the poor
contact in ECM
connector.
B135
3 4 5 6 7 8 9
16 17 18 19
22 23 24 25 26 27 28
EN-01302
Yes No
Go to step 2.
Contact your Sub-
aru distributor ser-
vice.
NOTE:
Inspection by DTM
is required,
cause
cause is deteriora-
tion of
parts.
be-
probable
multiple