Subaru 2002 IMPREZA Service Manual page 556

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Step
4 CHECK HARNESS BETWEEN INTAKE AIR
TEMPERATURE AND PRESSURE SENSOR
AND ECM CONNECTOR.
Measure the voltage between intake air tem-
perature and pressure sensor connector and
engine ground.
Connector & terminal
(E20) No. 2 (+) — Engine ground ( − − − − ):
5 CHECK HARNESS BETWEEN INTAKE AIR
TEMPERATURE AND PRESSURE SENSOR
AND ECM CONNECTOR.
1)Turn the ignition switch to OFF.
2)Measure the resistance of harness between
intake air temperature and pressure sensor
connector and engine ground.
Connector & terminal
(E20) No. 1 — Engine ground:
Check
Is the voltage more than 3 V?
Is the resistance less than 5
Ω?
EN-124
Yes
Go to step 5. Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
intake air tempera-
ture and pressure
sensor and ECM
connector
• Poor contact in
intake air tempera-
ture and pressure
sensor
• Poor contact in
ECM
• Poor contact in
coupling connector
(B21)
• Poor contact in
joint connector
(B83) and (B122)
Replace the intake Repair the har-
air temperature ness and connec-
and pressure sen- tor.
sor. <Ref. to FU-
NOTE:
37, Intake Air
In this case, repair
Temperature and
the following:
Pressure Sensor.>
• Open circuit in
harness between
intake air tempera-
ture and pressure
sensor and ECM
connector
• Poor contact in
intake air tempera-
ture and pressure
sensor
• Poor contact in
ECM
• Poor contact in
coupling connector
(B21)
• Poor contact in
joint connector
(B83) and (B122)
No