Subaru 2002 IMPREZA Service Manual page 668

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Step
7 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
(B136) No. 29 — (B2) No. 2:
8 CHECK HARNESS BETWEEN ECM AND
PRESSURE SENSOR CONNECTOR.
Measure the resistance of harness between
ECM and pressure sensor connector.
Connector & terminal
(B136) No. 16 — (B2) No. 1:
9 CHECK POOR CONTACT.
Check poor contact in pressure sensor con-
nector.
10 CHECK CURRENT DATA.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from atmospheric
pressure sensor.
3)Turn the ignition switch to ON.
4)Read the data of intake manifold absolute
pressure signal using Subaru Select Monitor or
OBD-II general scan tool.
NOTE:
•Subaru Select Monitor
For detailed operation procedure, refer to the
"READ CURRENT DATA FOR ENGINE".
<Ref. to EN-34, Subaru Select Monitor.>
•OBD-II general scan tool
For detailed operation procedures, refer to the
OBD-II General Scan Tool Instruction Manual.
Check
Is the resistance less than 1
Ω?
Is the resistance less than 1
Ω?
Is there poor contact in pres-
sure sensor connector?
Is the value more than 140 kPa
(1,050 mmHg, 41.34 inHg)?
EN-236
Yes
Go to step 8. Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
ECM and pressure
sensor connector
Go to step 9. Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
ECM and pressure
sensor connector
• Poor contact in
joint connector
(B83), (B122)
Repair the poor Replace the atmo-
contact in atmo- spheric pressure
spheric pressure sensor. <Ref. to
sensor connector. FU-38, Atmo-
spheric Pressure
Sensor.>
Repair the battery Replace the atmo-
short circuit in har- spheric pressure
ness between sensor. <Ref. to
ECM and atmo- FU-38, Atmo-
spheric pressure spheric Pressure
sensor connector. Sensor.>
No