Subaru 2002 IMPREZA Service Manual page 1215

ENGINE MALFUNCTION INDICATOR LAMP (MIL)
Step
1 CHECK STATUS OF CHECK ENGINE MAL-
FUNCTION INDICATOR LAMP (MIL).
1)Turn the ignition switch to OFF.
2)Disconnect the test mode connector.
3)Turn the ignition switch to ON. (engine OFF)
2 CHECK HARNESS BETWEEN COMBINA-
TION METER AND ECM CONNECTOR.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from ECM.
3)Turn the ignition switch to ON.
3 CHECK HARNESS BETWEEN TEST MODE
CONNECTOR AND CHASSIS GROUND.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from ECM.
3)Measure the resistance of harness between
test mode connector and chassis ground.
Connector & terminal
(B76) No. 1 — Chassis ground:
4 CHECK POOR CONTACT.
Check poor contact in ECM connector.
5 CHECK HARNESS BETWEEN ECM AND
TEST MODE CONNECTOR.
1)Connect the test mode connector.
2)Measure the resistance of harness between
ECM and chassis ground.
Connector & terminal
(B134) No. 5 — Chassis ground:
6 CHECK POOR CONTACT.
Check poor contact in ECM connector.
Check
Does the MIL come on?
Does the MIL come on?
Is the resistance less than 1
Ω?
Is there poor contact in ECM
connector?
Is the resistance less than 1
Ω?
Is there poor contact in ECM
connector?
EN(TURBO)-55
ENGINE (DIAGNOSTICS)
Yes
Go to step 2. Repair the MIL cir-
cuit. <Ref. to
EN(TURBO)-50,
CHECK ENGINE
MALFUNCTION
INDICATOR
LAMP (MIL)
DOES NOT
COME ON.,
Engine Malfunc-
tion Indicator
Lamp (MIL).>
Repair the ground Go to step 3.
short circuit in har-
ness between
combination meter
and ECM connec-
tor.
Go to step 4. Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
test mode connec-
tor and chassis
ground
Repair the poor Go to step 5.
contact in ECM
connector.
Go to step 6. Repair the open
circuit in harness
between ECM and
test mode connec-
tor.
Repair the poor Replace the ECM.
contact in ECM <Ref. to
connector. FU(TURBO)-49,
Engine Control
Module.>
No