ENGINE MALFUNCTION INDICATOR LAMP (MIL)
Engine (Diagnostics)
15. Engine Malfunction Indicator Lamp (MIL)
S088653
A: PROCEDURE
S088653E45
1. Activation of check engine malfunction indicator lamp (MIL). <Ref. to EN(DOHC TURBO)-51, ACTIVATION OF CHECK ENGINE MALFUNCTION INDICATOR LAMP (MIL), Engine Malfunction Indicator Lamp (MIL).>
2. Check engine malfunction indicator lamp (MIL) does not come on. <Ref. to EN(DOHC TURBO)-52, CHECK ENGINE MALFUNCTION INDICATOR LAMP (MIL) DOES NOT COME ON., Engine Malfunction Indicator Lamp (MIL).>
3. Check engine malfunction indicator lamp (MIL) does not go off. <Ref. to EN(DOHC TURBO)-55, CHECK ENGINE MAL­FUNCTION INDICATOR LAMP (MIL) DOES NOT GO OFF., Engine Malfunction Indicator Lamp (MIL).>
4. Check engine malfunction indicator lamp (MIL) does not blink at a cycle of 3 Hz. <Ref. to EN(DOHC TURBO)-56, CHECK ENGINE MALFUNCTION INDICATOR LAMP (MIL) DOES NOT BLINK AT A CYCLE OF 3 HZ., Engine Malfunction Indicator Lamp (MIL).>
5. Check engine malfunction indicator lamp (MIL) remains blinking at a cycle of 3 Hz. <Ref. to EN(DOHC TURBO)-60, CHECK ENGINE MALFUNCTION INDICATOR LAMP (MIL) REMAINS BLINKING AT A CYCLE OF 3 HZ., Engine Malfunction Indicator Lamp (MIL).>
EN(DOHC TURBO)-50
ENGINE MALFUNCTION INDICATOR LAMP (MIL)
Engine (Diagnostics)
B: ACTIVATION OF CHECK ENGINE MALFUNCTION INDICATOR LAMP
? MI L ) f S088653E89
1) When ignition switch is turned to ON (engine off), the CHECK ENGINE malfunction indicator lamp (MIL) (A) in the combination meter illumi­nates.
NOTE:
If the MIL does not illuminate, perform diagnostics of the CHECK ENGINE light circuit or the combi­nation meter circuit. <Ref. to EN(DOHC TURBO)-52, CHECK ENGINE MALFUNCTION INDICATOR LAMP (MIL) DOES NOT COME ON., Engine Mal­function Indicator Lamp (MIL).>
4) When ignition switch is turned to ON (engine off) or to "START" with the test mode connector connected, the MIL blinks at a cycle of 3 Hz.
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2) After starting the engine, the MIL goes out. If it does not, either the engine or the emission control system is malfunctioning.
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3) If the diagnosis system senses a misfire which could damage the catalyzer, the MIL will blink at a cycle of 1 Hz.
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EN(DOHC TURBO)-51
Engine (Diagnostics)
ENGINE MALFUNCTION INDICATOR LAMP (MIL)
C: CHECK ENGINE MALFUNCTION INDICATOR LAMP (MIL) DOES NOT
COME ON.
S088653E90
•  DIAGNOSIS:
•  The CHECK ENGINE malfunction indicator lamp (MIL) circuit is open or shorted.
•  TROUBLE SYMPTOM:
•  When ignition switch is turned ON (engine OFF), MIL does not come on.
•  WIRING DIAGRAM:
for_01_24-87.jpg
EN(DOHC TURBO)-52
ENGINE MALFUNCTION INDICATOR LAMP (MIL)
Engine (Diagnostics)
No.
Step
Check
Yes
No
1
CHECK OUTPUT SIGNAL FROM ECM.
Is the voltage less than 1
Go to step 4.
Go to step 2.
1) Turn ignition switch to ON.
V?
2) Measure voltage between ECM connector
and chassis ground.
Connector & terminal
(B137) No. 15 (+) — Chassis ground
2
CHECK POOR CONTACT.
Does the MIL come on
Repair poor con-
Go to step 3.
when shaking or pulling
tact in ECM con-
ECM connector and har-
nector.
ness?
3
CHECK ECM CONNECTOR.
Is ECM connector correctly
Replace ECM.
Repair connection
connected?
<Ref. to
of ECM connec-
FU(DOHC
tor.
TURBO)-47,
Engine Control
Module.>
4
CHECK HARNESS BETWEEN COMBINA-
Is resistance less than 1
Go to step 5.
Repair harness
TION METER AND ECM CONNECTOR.
Q?
and connector.
1) Turn ignition switch to OFF.
NOTE:
2) Remove combination meter. <Ref. to IDI-
In this case,
15, Combination Meter Assembly.>
repair the follow-
3) Disconnect connector from ECM and com-
ing:
bination meter.
• Open circuit in
4) Measure resistance of harness between
harness between
ECM and combination meter connector.
ECM and combi-
Connector & terminal
nation meter con-
(B137) No. 15 — (i10) No. 9:
nector
• Poor contact in
coupling connec-
tor
5
CHECK POOR CONTACT.
Is there poor contact in
Repair poor con-
Go to step 6.
Check poor contact in combination meter connec-
combination meter connec-
tact in combina-
nector.
tor?
tion meter con-
nector.
EN(DOHC TURBO)-53
Engine (Diagnostics)
ENGINE MALFUNCTION INDICATOR LAMP (MIL)
No.
Step
Check
Yes
No
6
CHECK HARNESS BETWEEN COMBINA­TION METER AND IGNITION SWITCH CON­NECTOR.
1) Turn ignition switch to ON. 2) Measure voltage between combination meter connector and chassis ground. Connector & terminal (i10) No. 2 (+) — Chassis ground (-):
Is voltage more than 10 V?
Go to step 7.
Check the follow­ing and repair if necessary. NOTE: • Broken down ignition relay. • Blown out fuse (No. 5). • If replaced fuse (No. 5) blows easily, check the harness for short circuit of harness between fuse (No. 5) and ignition relay connector. • Open or short circuit in harness between fuse (No. 5) and battery ter­minal • Open circuit in harness between fuse (No. 5) and ignition relay con­nector • Poor contact in ignition relay con­nector • Poor contact in ignition switch connector
7
CHECK LAMP BULB.
Remove engine malfunction indicator lamp bulb.
Is lamp bulb condition OK?
Repair combina­tion meter con­nector.
Replace lamp bulb.
EN(DOHC TURBO)-54
ENGINE MALFUNCTION INDICATOR LAMP (MIL)
Engine (Diagnostics)
D: CHECK ENGINE MALFUNCTION INDICATOR LAMP (MIL) DOES NOT GO
OFF.
S088653E91
•  DIAGNOSIS:
•  The CHECK ENGINE malfunction indicator lamp (MIL) circuit is shorted.
•  TROUBLE SYMPTOM:
•  Although MIL comes on when engine runs, trouble code is not shown on Subaru select monitor or OBD-II general scan tool display.
•  WIRING DIAGRAM:
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No.
Step
Check
Yes
No
1
CHECK HARNESS BETWEEN COMBINA­TION METER AND ECM CONNECTOR.
1) Turn ignition switch to OFF.
2)  Disconnect connector from ECM.
3) Turn ignition switch to ON.
Does the MIL come on?
Repair short cir­cuit in harness between combina­tion meter and ECM connector.
Replace ECM. <Ref. to FU(DOHC TURBO)-47, Engine Control Module.>
EN(DOHC TURBO)-55
ENGINE MALFUNCTION INDICATOR LAMP (MIL)
Engine (Diagnostics)
E: CHECK ENGINE MALFUNCTION INDICATOR LAMP (MIL) DOES NOT
BLINK AT A CYCLE OF 3 Hz.
S088653E92
•  DIAGNOSIS:
•  The CHECK ENGINE malfunction indicator lamp (MIL) circuit is open or shorted.
•  Test mode connector circuit is in open.
•  TROUBLE SYMPTOM:
•  When inspection mode, MIL does not blink at a cycle of 3 Hz.
EN(DOHC TURBO)-56
ENGINE MALFUNCTION INDICATOR LAMP (MIL)
Engine (Diagnostics)
• WIRING DIAGRAM:
for_01_24-89.jpg
S2M2180
EN(DOHC TURBO)-57
Engine (Diagnostics)
ENGINE MALFUNCTION INDICATOR LAMP (MIL)
No.
Step
Check
Yes
No
1
CHECK STATUS OF CHECK ENGINE MAL­FUNCTION INDICATOR LAMP (MIL).
1) Turn ignition switch to OFF. 2) Disconnect test mode connector. 3) Turn ignition switch to ON. (engine OFF)
Does the MIL come on?
Go to step 2.
Repair the MIL circuit. <Ref. to EN(DOHC TURBO)-52, CHECK ENGINE MALFUNCTION INDICATOR LAMP (MIL) DOES NOT COME ON., Engine Malfunc­tion Indicator Lamp (MIL).>
2
CHECK HARNESS BETWEEN COMBINA­TION METER AND ECM CONNECTOR.
1) Turn ignition switch to OFF. 2) Disconnect connector from ECM. 3) Turn ignition switch to ON.
Does the MIL come on?
Repair ground short circuit in harness between combination meter and ECM connec­tor.
Go to step 3.
3
CHECK HARNESS BETWEEN TEST MODE CONNECTOR AND CHASSIS GROUND.
1) Turn ignition switch to OFF. 2) Disconnect connector from ECM. 3) Measure resistance of harness between test mode connector and chassis ground. Connector & terminal (B76) No. 1 — Chassis ground:
Is resistance less than 1 Q?
Go to step 4.
Repair harness and connector. NOTE: In this case, repair the follow­ing: • Open circuit in harness between test mode con­nector and chas­sis ground
4
CHECK POOR CONTACT.
Check poor contact in ECM connector.
Is there poor contact in ECM connector?
Repair poor con­tact in ECM con­nector.
Go to step 5.
5
CHECK HARNESS BETWEEN ECM AND TEST MODE CONNECTOR.
1) Connect test mode connector. 2) Measure resistance of harness between ECM and chassis ground. Connector & terminal (B134) No. 5 — Chassis ground:
Is resistance less than 1 Q?
Go to step 6.
Repair open cir­cuit in harness between ECM and test mode connector.
6
CHECK POOR CONTACT.
Check poor contact in ECM connector.
Is there poor contact in ECM connector?
Repair poor con­tact in ECM con­nector.
Replace ECM. <Ref. to FU(DOHC TURBO)-47, Engine Control Module.>
EN(DOHC TURBO)-58
ENGINE MALFUNCTION INDICATOR LAMP (MIL)
Engine (Diagnostics) MEMO:
EN(DOHC TURBO)-59
Engine (Diagnostics)
ENGINE MALFUNCTION INDICATOR LAMP (MIL)
F: CHECK ENGINE MALFUNCTION INDICATOR LAMP (MIL) REMAINS
BLINKING AT A CYCLE OF 3 Hz.
S088653E93
•  DIAGNOSIS:
•  Test mode connector circuit is shorted.
•  TROUBLE SYMPTOM:
•  MIL blinks at a cycle of 3 Hz when ignition switch is turned to ON.
•  WIRING DIAGRAM:
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S2M2180
EN(DOHC TURBO)-60
ENGINE MALFUNCTION INDICATOR LAMP (MIL)
Engine (Diagnostics)
No.
Step
Check
Yes
No
1
CHECK TEST MODE CONNECTOR.
1) Disconnect test mode connector. 2) Turn ignition switch to ON.
Does MIL flash on and off?
Go to step 2.
System is in good order. NOTE: MIL blinks at a cycle of 3 Hz when test mode connector is con­nected.
2
CHECK HARNESS BETWEEN ECM CON­NECTOR AND ENGINE GROUNDING TER­MINAL.
1) Turn ignition switch to OFF. 2) Disconnect connector from ECM. 3) Measure resistance of harness between ECM connector and chassis ground. Connector & terminal (B134) No. 5 — Chassis ground:
Is resistance less than 5 Q?
Repair short cir­cuit in harness between ECM and test mode connector.
Replace ECM. <Ref. to FU(DOHC TURBO)-47, Engine Control Module.>
EN(DOHC TURBO)-61
ENGINE MALFUNCTION INDICATOR LAMP (MIL)
Engine (Diagnostics) MEMO:
EN(DOHC TURBO)-62