Subaru Legacy 2002 Service Manual page 625

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Engine (Diagnostics)
No.
8 CHECK HARNESS BETWEEN ECM AND
INTAKE AIR TEMPERATURE AND PRES-
SURE SENSOR CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from ECM.
3) Measure 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
INTAKE AIR TEMPERATURE AND PRES-
SURE SENSOR CONNECTOR.
Measure 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 pres-
sure sensor connector.
Step
Is the resistance less than
1 Ω?
Is the resistance more than
500 kΩ?
Is there poor contact in
intake manifold pressure
sensor connector?
EN-108
Check Yes
Go to step 9.
Go to step 10.
Repair poor con-
tact in intake air
temperature and
pressure sensor
connector.
No
Repair open cir-
cuit in harness
between ECM
and intake air
temperature and
pressure sensor
connector.
Repair ground
short circuit in
harness between
ECM and intake
air temperature
and pressure sen-
sor connector.
Replace intake air
temperature and
pressure sensor.
<Ref. to FU-37,
Intake Air Tem-
perature and
Pressure Sensor.>