Subaru Legacy 2004 Service Manual page 861

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
8 CHECK HARNESS BETWEEN ECM AND
MANIFOLD ABSOLUTE PRESSURE SEN-
SOR CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Measure the resistance of harness
between ECM and manifold absolute pressure
sensor connector.
Connector & terminal
(B136) No. 22 — (E21) No. 1:
9 CHECK HARNESS BETWEEN ECM AND
MANIFOLD ABSOLUTE PRESSURE SEN-
SOR CONNECTOR.
Measure the resistance of harness between
ECM and manifold absolute pressure sensor
connector.
Connector & terminal
(B136) No. 35 — (E21) No. 2:
10 CHECK POOR CONTACT.
Check poor contact in manifold absolute pres-
sure sensor connector.
11 CHECK HARNESS BETWEEN ECM AND
MANIFOLD ABSOLUTE PRESSURE SEN-
SOR CONNECTOR.
1) Turn the ignition switch to OFF, and the
Subaru Select Monitor switch to OFF.
2) Disconnect the connector from manifold
absolute pressure sensor.
3) Turn the ignition switch to ON, and the Sub-
aru Select Monitor switch to ON.
4) Read the data of intake manifold absolute
pressure signal using Subaru Select Monitor.
NOTE:
For detailed operation procedure, refer to the
"READ CURRENT DATA FOR ENGINE". <Ref.
to EN(H4SO 2.5)(diag)-26, Subaru Select Mon-
itor.>
Check
Is the resistance less than 1
!?
Is the resistance less than 1
!?
Is there poor contact in mani-
fold absolute pressure sensor
connector?
Is the value more than 119.5
kPa (896.5 mmHg, 35.29
inHg)?
EN(H4SO 2.5)(diag)-102
Yes
Go to step 9. Repair the open
circuit in harness
between ECM and
manifold absolute
pressure sensor
connector.
Go to step 10. Repair the open
circuit in harness
between ECM and
manifold absolute
pressure sensor
connector.
Repair the poor Replace the mani-
contact in mani- fold absolute pres-
fold absolute pres- sure sensor. <Ref.
sure sensor to FU(H4SO 2.5)-
connector. 25, Manifold Abso-
lute Pressure Sen-
sor.>
Repair battery Replace the mani-
short in harness fold absolute pres-
between ECM and sure sensor. <Ref.
manifold absolute to FU(H4SO 2.5)-
pressure sensor 25, Manifold Abso-
connector. lute Pressure Sen-
sor.>
No