How to fix m I l control circuit malfunction check engine light not working or abs others work I changed cluster still shows cod p0650 What do I do

When you turn the key on (just on ,not start ) the check engine light doesn't come on ? Does the car start an run ? Maybe the bulb is burnt out , seen that a few times .
Have the vehicle checked for code's
DTC P0650 Malfunction Indicator Lamp (MIL) Control Circuit
Circuit Description
There should always be a steady malfunction indicator lamp (MIL) when the ignition switch is on and the engine is not running. The ignition voltage is supplied within the instrument cluster to the indicator bulb. The engine control module (ECM) controls the lamp by grounding the control circuit via an internal solid state device called a driver. (transistor)

Do all the gauges an other instrument cluster lights work ?

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Saturn Ion Complete Workshop Service Repair Manual 2003 2004 2005 2006 2007


for the easy solution download the pdf file

The instrument cluster (10849) carries out a display proveout to verify that all warning/indicator lamps and monitored systems are functioning correctly. When the ignition switch (11572) is in the ON position with the engine (6007) off, the following indicators will illuminate:

• CHECK ENGINE/malfunction indicator lamp (MIL).
• CHECK GAGE warning indicator.
• Charge system warning indicator.
• Anti-lock brake warning indicator (ABS).
• Safety belt warning indicator (60second proveout).
• Air bag indicator.

• An indicator is inoperative - CHECK ENGINE/malfunction indicator lamp (MIL)

• Bulb.
• Circuitry.
• Instrument cluster printed circuit.
• Powertrain control module (PCM) (12A650).

• GO to Pinpoint Test N .

Code 650 is for a problem with the check engine light circuit.
It could be something in the computer, but chances are the bulb in the cluster is out. You may have to remove the cluster to replace the bulb.

P0650 - Malfunction Indicator Lamp Control Circuit Malfunction

Possible causes- Harness or connectors for the MIL circuit is open or shorted. Check connectors to instrument cluster.
- MIL bulb may be faulty, check this first.
- Faulty ECM. Very rare that this is the problem.

Read more: http://engine-codes.com/p0650.html#ixzz27mKYd94I

DTC P0650 represents an issue with the actual check engine light (malfunction indicator lamp). Ignition voltage is supplied directly to the malfunction indicator lamp (MIL). The powertrain control module (PCM) controls the lamp by grounding the control circuit via an internal switch called a driver. The primary function of the driver is to supply the ground for the component being controlled. The driver has a fault line which is monitored by the PCM. When the PCM is commanding a component ON, the voltage of the control circuit should be low, near 0 volts. When the PCM is commanding the component control circuit OFF, the voltage potential of the circuit should be high, near battery voltage. If the fault detection circuit senses a voltage other than what is expected, the fault line status will change causing the diagnostic trouble code (DTC) to set.

A DTC P0650 indicates a problem with the circuit to the actual check engine light itself. If the fault is current, check if the check engine (service engine soon) lamp comes on when you turn the ignition on, If not, we will need to pull the engine control computer and ground the wire that goes to the light. If the light comes on, it is a failed pcm which must be replaced and reprogrammed. If not, it is either the circuit to the cluster or the cluster itself.

Good luck.

CODE PO650 MALFUNCTION INDICATOR LAMP CIRCUIT MALFUNCTION CONDITIONS. POSSIBLE CAUSES MIL CONTROL CIRCUIT IS OPEN , SHORTED TO GROUND TO SYSTEM POWER,MIL CONTROL POWER CIRCUIT OPEN IN THE INSTRUMENT CLUSTER, MIL THE LAMP IS DAMAGED OR HAS FAILED,INSTRUMENT CLUSTER OR THE PCM HAS FAILED. CODE PO332 KNOCK SENSOR CIRCUIT LOW INPUT BANK 2 CONDITIONS, POSSIBLE CAUSE KNOCK SENSOR FAILED, CODE P1875 4WD LOW SWITCH CIRCUIT MALFUNCTION CONDITIONS FOR TRANSMISSIONS 4L60E 4L80E, POSSIBLE CAUSES 4WD SWITCH LOW SIGNAL CIRCUIT IS OPEN OR SHORTED TO GROUND, 4WD LOW SWITCH IS DAMAGED OR IT HAS FAILED,PCM HAS FAILED.

P0125 - Insufficient Coolant Temperature for Closed Loop Fuel Control Possible causes - Harness or connectors (The sensor circuit is open or shorted.)
- Engine coolant temperature sensor may be faulty
- Thermostat may be fault (most common cause)
P0650 - Malfunction Indicator Lamp Control Circuit Malfunction (Check Engine light)

Symptoms - Engine Light ON (or Service Engine Soon Warning Light)
Possible causes - Harness or connectors for the MIL (Check Engine Light) circuit is open or shorted
- MIL bulb may be faulty
- Faulty ECM

P0650 Malfunction Indicator Lamp (MIL) Control Circuit Malfunction

Malfunction Indicator Lamp (MIL) is located on the instrument panel. When the ignition switch is turned ON without engine running, MIL will light up. This is a bulb check. When the engine is started, MIL should go off. If MIL remains on, the on board diagnostic system has detected an engine system malfunction.

Possible Causes:

Harness or connectors (MIL circuit is open or shorted.)

MIL bulb may be faulty