Subaru 2002 IMPREZA Service Manual page 1271

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
2 CHECK INPUT SIGNAL FOR ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(B135) No. 9 (+) — Chassis ground ( − − − − ):
3 CHECK INPUT SIGNAL FOR ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(B135) No. 9 (+) — Chassis ground ( − − − − ):
4 CHECK INPUT SIGNAL FOR ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(B135) No. 8 (+) — Chassis ground ( − − − − ):
5 CHECK HARNESS BETWEEN ECM AND
PRESSURE SENSOR CONNECTOR.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from pressure
sensor.
3)Turn the ignition switch to ON.
4)Measure the voltage between pressure sen-
sor connector and engine ground.
Connector & terminal
(E21) No. 3 (+) — Engine ground ( − − − − ):
6 CHECK HARNESS BETWEEN ECM AND
PRESSURE SENSOR CONNECTOR.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from ECM.
3)Measure the resistance of harness between
ECM and pressure sensor connector.
Connector & terminal
(B135) No. 8 — (E21) No. 1:
7 CHECK HARNESS BETWEEN ECM AND IN-
TAKE MANIFOLD PRESSURE SENSOR
CONNECTOR.
Measure the resistance of harness between
ECM and pressure sensor connector.
Connector & terminal
(B135) No. 19 — (E21) No. 2:
8 CHECK POOR CONTACT.
Check poor contact in pressure sensor con-
nector.
Check
Is the voltage more than 4.5 V? Go to step 4.
Does the voltage change more
than 4.5 V by shaking harness
and connector of ECM while
monitoring the value with volt-
age meter?
Is the voltage less than 0.7 V? Go to step 5.
Is the voltage more than 4.5 V? Go to step 6.
Is the resistance less than 1
Ω?
Is the resistance less than 1
Ω?
Is there poor contact in pres-
sure sensor connector?
EN(TURBO)-111
ENGINE (DIAGNOSTICS)
Yes
Go to step 3.
Repair the poor Contact with your
contact in ECM Subaru distributor
connector. service.
NOTE:
Inspection by DTM
is required,
cause
cause is deteriora-
tion of
parts.
Contact with your
Subaru distributor
service.
NOTE:
Inspection by DTM
is required,
cause
cause is deteriora-
tion of
parts.
Repair the open
circuit in harness
between ECM and
pressure sensor
connector.
Go to step 7. Repair the open
circuit in harness
between ECM and
pressure sensor
connector.
Go to step 8. Repair the open
circuit in harness
between ECM and
pressure sensor
connector.
Repair the poor Replace the intake
contact in pres- manifold pressure
sure sensor con- sensor. <Ref. to
nector. FU(TURBO)-35,
Pressure Sensor.>
No
be-
probable
multiple
be-
probable
multiple