Subaru 2002 IMPREZA Service Manual page 544

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Step
8 CHECK HARNESS BETWEEN ECM AND IN-
TAKE AIR TEMPERATURE AND PRESSURE
SENSOR CONNECTOR.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from ECM.
3)Measure the resistance of harness between
ECM and intake air temperature and pressure
sensor connector.
Connector & terminal
(B136) No. 16 — (E20) No. 1:
9 CHECK HARNESS BETWEEN ECM AND IN-
TAKE AIR TEMPERATURE AND PRESSURE
SENSOR CONNECTOR.
Measure the resistance of harness between
intake air temperature and pressure sensor
connector and engine ground.
Connector & terminal
(E20) No. 4 — Engine ground:
10 CHECK POOR CONTACT.
Check poor contact in intake manifold pressure
sensor connector.
Check
Is the resistance less than 1
Ω?
Is the resistance more than
500 kΩ?
Is there poor contact in intake
manifold pressure sensor con-
nector?
EN-112
Yes
Go to step 9. Repair the open
circuit in harness
between ECM and
intake air tempera-
ture and pressure
sensor connector.
Go to step 10. Repair the ground
short circuit in har-
ness between
ECM and intake
air temperature
and pressure sen-
sor connector.
Repair the poor Replace the intake
contact in intake air temperature
air temperature and pressure sen-
and pressure sen- sor. <Ref. to FU-
sor connector. 37, Intake Air
Temperature and
Pressure Sensor.>
No