Fuel System > Engine Control System > P0650 Malfunction Indicator Lamp (MIL) Control Circuit

General Description

The Malfunction Indicator Lamp (MIL), which is located in the instrument cluster, comes on to notify the driver that there may be a problem with the vehicle and that service is needed. Immediately after the ignition switch turns on, the malfunction indicator lamp is lit to indicate that the MIL operates normally and goes off after starting

DTC Description

Checking input signal of engine check lamp every 10 sec. under detecting condition, if open, short to battery or ground is detected, PCM sets P0650.

DTC Detecting Condition

Item

Detecting Condition

Possible cause

DTC Strategy

•	Check the MIL

•	Poor connection

•	Open or short in MIL circuit

•	Faulty MIL

•	Faulty PCM

Enable Conditions

•	After 0.5 sec under conditions below

•	Engine running

•	11V ≤ Battery voltage ≤ 16V

Threshold value

•	Open or short

Diagnosis Time

•	Continuous

MIL On Condition

•	DTC only (NO MIL ON)

Schematic Diagram

Monitor DTC Status

Check DTC Status

(1)	Connect scantool to Data Link Connector(DLC).

(2)

IG "ON".

(3)	Select "DTC" button, and then Press "DTC Status" to check DTC's information from the DTCs menu.

(4)	Read "DTC Status" parameter.

(5)

Is parameter displayed "Present fault"?

	▶ Go to "Terminal and connector inspection" procedure.
	▶ Fault is intermittent caused by poor contact in the sensor's and/or PCM's connector or was repaired and PCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, ending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.

Terminal And Connector Inspection

1.	Many malfunctions in the electrical system are caused by poor harness and terminal condition. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.

2.	Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.

Has a problem been found?

	▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure
	▶ Go to " Power Circuit Inspection " procedure.

Power Circuit Inspection

■ Check voltage

1.	IG "OFF" and disconnect Instrument cluster connector.

2.	IG "ON" and ENG "OFF"

Measure voltage between power supply terminal of instrument cluster harness connector and chassis ground.

Specification : Approx. B+

Is the measured voltage normal?

	▶ Go to "Control Circuit Inspection" procedure.
	▶ Check fuse between battery and instrument cluster for open or blown-off. ▶ Repair open or short to ground in harness, and go to "Verification of Vehicle Repair" procedure.

Control Circuit Inspection

1.	IG "OFF" and disconnect PCM connector.

2.	IG "ON" and ENG "OFF"

Measure voltage between MIL control terminal of PCM harness connector and chassis ground.

Specification : Approx. B+

Is the measured voltage within specification?

	▶ Go to "Component Inspection" procedure.
	▶ Check open in Engine warning lamp's filament. ▶ Repair open or short to ground in harness, and go to "Verification of Vehicle Repair" procedure.

Verification Of Vehicle Repair

After a repair, it is essential to verify that the fault has been corrected.

1.	Connect scantool and select "DTC" button.

2.	Press "DTC Status" button and confirm that "DTC Readiness Flag" indicates "Completed". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions

3.	Read "DTC Status" parameter

Is parameter displayed "History(Not Present) fault"?

	▶ System performing to specification at this time. Clear the DTC
	▶ Go to the applicable troubleshooting procedure.