Subaru Legacy 2004 Service Manual page 858

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
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 manifold
absolute pressure sensor.
3) Turn the ignition switch to ON.
4) Measure the voltage between manifold
absolute pressure sensor connector and
engine ground.
Connector & terminal
(E21) No. 3 (+) — Engine ground (
9 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. 35 — (E21) No. 2:
10 CHECK POOR CONTACT.
Check poor contact in manifold absolute pres-
sure sensor connector.
Check
Is the voltage more than 4.5 V? Go to step 9.
"
):
Is the resistance less than 1
!?
Is there poor contact in mani-
fold absolute pressure sensor
connector?
EN(H4SO 2.5)(diag)-99
ENGINE (DIAGNOSTICS)
Yes
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.>
No