Subaru IMPREZA 2002 Service Manual page 582

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
s the resistance more than
5 0 0
kQ?
s there poor contact in pres-
jure sensor connector?
Step
CHECK HARNESS BETWEEN ECM AND AT-
MOSPHERIC PRESSURE SENSOR CON-
N ECTO R
.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from atmospheric
pressure sensor.
3)Turn the ignition switch to ON.
4)Measure the voltage between atmospheric
pressure sensor connector and engine ground.
Connector & terminal
(B2) No. 3 (+)
-
Engine ground
( - ) I
Go to step 10.
Repair poor con-
tact in atmospheric
pressure sensor
connector.
CHECK HARNESS BETWEEN ECM AND AT-
MOSPHERIC PRESSURE SENSOR CON-
NECTOR.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from ECM.
3)Measure the resistance of harness between
ECM and pressure sensor connector.
Connector & terminal
(B 136) NO. 16
-
(B2) NO. 1
I
CHECK HARNESS BETWEEN ECM AND AT-
MOSPHERIC PRESSURE SENSOR CON-
NECTOR.
Measure the resistance of harness between
pressure sensor connector and engine ground.
Connector & terminal
(B2) No. 2
-
Engine ground:
0 CHECK POOR CONTACT.
Check poor contact in pressure sensor con-
nector.
Check
s
the voltage more than 4.5 V?
Yes
; o to step
8.
; o to step
9. s the resistance less than 1
2?
No
Repair harness
and connector.
NOTE:
In this case, repaii
the following:
Open circuit in
harness between
ECM and atmo-
spheric pressure
sensor connector
.
Poor contact in
joint connector
(B122)
Repair harness
and connector.
NOTE:
In this case, repaii
the following:
Open circuit in
harness between
ECM and pressure
sensor connector
Repair ground
short circuit in har-
ness between
ECM and pressure
sensor connector.
Replace the atmo-
spheric pressure
sensor. <Ref. to
Atmospheric Pres-
sure Sensor.>
FU (S0HC)-35,
EN(S0HC)-258