Subaru Impreza 2003 Service Manual page 519

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
5 CHECK HARNESS BETWEEN INTAKE AIR
TEMPERATURE SENSOR AND ECM CON-
NECTOR.
1)Turn the ignition switch to OFF.
2)Measure the resistance of harness between
intake air temperature sensor connector and
engine ground.
Connector & terminal
(E20) No. 2 — Engine ground:
Check
Is the resistance less than 5
Ω?
EN(H4SO)-107
ENGINE (DIAGNOSTICS)
Yes
Replace the intake Repair harness
air temperature and connector.
sensor. <Ref. to
NOTE:
FU(H4SO)-34,
In this case, repair
Intake Air Temper-
the following:
ature Sensor.>
• Open circuit in
harness between
intake air tempera-
ture sensor and
ECM connector
• Poor contact in
intake air tempera-
ture sensor
• Poor contact in
ECM
• Poor contact in
coupling connector
• Poor contact in
joint connector
No