Subaru Legacy 2002 Service Manual page 1331

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Engine (DIAGNOSTICS)
No.
7 CHECK HARNESS BETWEEN ECM AND
INTAKE MANIFOLD PRESSURE SENSOR
CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from ECM.
3) Measure resistance of harness between
ECM and intake manifold pressure sensor
connector.
Connector & terminal
(B135) No. 8 — (E21) No. 1:
8 CHECK HARNESS BETWEEN ECM AND
INTAKE MANIFOLD PRESSURE SENSOR
CONNECTOR.
Measure resistance of harness between ECM
and intake manifold pressure sensor connec-
tor.
Connector & terminal
(B135) No. 19 — (E21) No. 2:
9 CHECK POOR CONTACT.
Check poor contact in intake manifold pres-
sure sensor connector.
10 CHECK HARNESS BETWEEN ECM AND
PRESSURE SENSOR CONNECTOR.
1) Turn ignition switch to OFF and Subaru
Select Monitor or the OBD-II general scan
tool switch to OFF.
2) Disconnect connector from pressure sen-
sor.
3) Turn ignition switch to ON and Subaru
Select Monitor or the OBD-II general scan
tool switch to ON.
4) Read data of intake manifold absolute
pressure signal using Subaru Select Monitor
or OBD-II general scan tool.
NOTE:
¼ Subaru Select Monitor
For detailed operation procedure, refer to the
"READ CURRENT DATA FOR ENGINE".
<Ref. to EN(H6)-38, Subaru Select Monitor.>
¼ OBD-II general scan tool
For detailed operation procedures, refer to the
OBD-II General Scan Tool Instruction Manual.
Step
Is the resistance less than
1 Ω?
Is the resistance less than
1 Ω?
Is there poor contact in
intake manifold pressure
sensor connector?
Is the value more than 130
kPa (975 mmHg, 38.39
inHg)?
EN(H6)-124
Check Yes
Go to step 8.
Go to step 9.
Repair poor con-
tact in intake
manifold pressure
sensor connector.
Repair battery
short circuit in
harness between
ECM and intake
manifold pressure
sensor connector.
No
Repair open cir-
cuit in harness
between ECM
and intake mani-
fold pressure sen-
sor connector.
Repair open cir-
cuit in harness
between ECM
and intake mani-
fold pressure sen-
sor connector.
Replace intake
manifold pressure
sensor. <Ref. to
FU(H6)-34, Intake
Manifold Pressure
Sensor.>
Replace intake
manifold pressure
sensor. <Ref. to
FU(H6)-34, Intake
Manifold Pressure
Sensor.>