Subaru Legacy 2003 Service Manual page 1935

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
5 CHECK HARNESS BETWEEN MASS AIR
FLOW AND INTAKE AIR TEMPERATURE
SENSOR AND ECM CONNECTOR.
1) Turn the ignition switch to OFF.
2) Measure the resistance of harness
between mass air flow and intake air tem-
perature sensor and engine ground.
Connector & terminal
(B3) No. 5 — Engine ground:
Is the measured value less than the speci-
fied value?
Step
EN(H4DOSTC)-96
Value
5 Ω
Yes
Replace the mass Repair the har-
air flow and intake ness and connec-
air temperature tor.
sensor. <Ref. to
NOTE:
FU(H4DOSTC)-
In this case, repair
33, Mass Air Flow
the following:
and Intake Air
• Open circuit in
Temperature Sen-
harness between
sor.>
mass air flow and
intake air tempera-
ture sensor and
ECM connector
• Poor contact in
mass air flow and
intake air tempera-
ture sensor
• Poor contact in
ECM
• Poor contact in
joint connector
No