Malfunction Indicator Lamp: Testing and Inspection

CHECK ENGINE MALFUNCTION INDICATOR LAMP (MIL) DOES NOT COME ON

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

Step 8A1:

Step 8A2:

Step 8A3:

Step 8A4:

Step 8A5:

Step 8A6:

Step 8A7:

PROCEDURES

CHECK ENGINE MALFUNCTION INDICATOR LAMP (MIL) DOES NOT GO OFF

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

Step 8B1:

PROCEDURES

CHECK ENGINE MALFUNCTION INDICATOR LAMP (MIL) DOES NOT BLINK AT A CYCLE OF 3 Hz

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.




WIRING DIAGRAM

Step 8C1:

Step 8C2:

Step 8C3:

Step 8C4:

Step 8C5:

PROCEDURES

CHECK ENGINE MALFUNCTION INDICATOR LAMP (MIL) REMAINS BLINKING AT A CYCLE OF 3 Hz

DIAGNOSIS:
- Test mode connector circuit is shorted.

TROUBLE SYMPTOM:
- Even though test mode connector is disconnected, MIL blinks at a cycle of 3 Hz when ignition switch is turned to ON.




WIRING DIAGRAM

Step 8D1:

PROCEDURES