Subaru Impreza 2003 Service Manual page 579

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
6 CHECK HARNESS BETWEEN EGR SOLE-
NOID VALVE AND ECM CONNECTOR.
1)Turn the ignition switch to OFF.
2)Disconnect the connectors from EGR sole-
noid valve and ECM.
3)Measure the resistance of harness between
EGR solenoid valve and ECM connector.
Connector & terminal
(B134) No. 18 — (E18) No. 6:
(B134) No. 17 — (E18) No. 1:
(B134) No. 16 — (E18) No. 4:
(B134) No. 15 — (E18) No. 3:
7 CHECK HARNESS BETWEEN EGR SOLE-
NOID VALVE AND ECM CONNECTOR.
Measure the resistance of harness between
EGR solenoid valve and chassis ground.
Connector & terminal
(B134) No. 15 — Chassis ground:
(B134) No. 16 — Chassis ground:
(B134) No. 17 — Chassis ground:
(B134) No. 18 — Chassis ground:
8 CHECK POOR CONTACT.
Check the poor contact in ECM and EGR sole-
noid valve connector.
Check
Is the resistance less than 1
Ω?
Is the resistance more than 1
MΩ?
Is there poor contact in ECM
and EGR solenoid valve con-
nector?
EN(H4SO)-167
ENGINE (DIAGNOSTICS)
Yes
Go to step 7. Repair the open
circuit in harness
between ECM and
EGR solenoid
valve connector.
Go to step 8. Repair the short
circuit in harness
between main
relay and EGR
solenoid valve
connector.
Repair the poor Even if malfunc-
contact in ECM tion indicator light
and EGR solenoid lights up, the cir-
valve connector. cuit has returned
to a normal condi-
tion at this time.
No