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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)
2. Turn key all the way forward - not to the point where the car starts, just to the point where all the lights come on. Do it in this sequence: ON-OFF-ON-OFF-ON..
3. Keep a close eye on your odometer. You will see a series of codes display, followed by the word "donE"...
4. These codes will tell you why the "Check Engine Light" is coming on.
5. If you see "P0442" followed by "P0456". These codes mean respectively: EVAP sensor detection... SMALL LEAK. IF IT IS THESE SET OF CODES, fear not - nothing is wrong with your car. Simply tighten your gas cap, then...
6. Pop the hood, disconnect the NEGATIVE battery terminal - DO NOT DISCONNECT THE POSITIVE TERMINAL - FOR THE LOVE OF GOD. You will run the risk of shorting out the electrical system.
What indicator lamp? There are several. ABS, TRACTION CONTROL, BRAKE LIGHT, AIRBAG LIGHT, SEAT BELT LIGHT, MAINTENANCE LIGHT, CHECK ENGINE LIGHT, OIL LIGHT, ETC.
most of these will store codes when they turn on. All of those except the check engine light will require a high end scan tool to retrieve the codes. The check engine light codes can be retrieved by an OBDII code reader. You can purchase them for under $100 or you can swing buy your local parts store. Often they will pull codes for free.
Once you know the codes you'll have a better idea of what needs to be done.
Many vehicles have a control module for the automatic transmission called a transmission control module (TCM). The engine control module (ECM) communicates with the TCM to monitor the automatic transmission for faults. If the TCM detects a fault in the automatic transmission and sets a transmission related fault code, the ECM is informed of this also and sets a P0700 in the ECM memory. This illuminates the Malfunction Indicator Lamp (MIL) to let the driver know there is a problem. If this code is present and the MIL (Malfunction Indicator Lamp) is illuminated that basically means there is at least one transmission code set in the TCM's memory. P0700 is an informational code only. It doesn't point to a direct fault in the engine, only a general fault in the transmission. More diagnosis is necessary to identify what the transmission fault is. This requires a scan tool that will communicate with the transmission module.
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.
The check engine light also called the malfunction indicator comes only when the computer control unit (called the PCM) senses a fault in the electronic controls of the engine and/or the emission system, there are about 200 possible faults that turn the light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen and Autozone parts stores do this testing for free.
This light shows operational status of traction
control system. If it is constantly lit when engine is running, this
means that traction control system is off. If the light flashes during
driving, it means the loss of traction at the wheels, and traction
control system is operating- decreasing engine torque to stop exessive
On a 1998 3 series (E36) BMW, this indicator lamp is for the ASC+T = automatic stability control plus traction. It should go shortly after the ignition is switched on implying that the system is OK. If the indicator lamp fails to go out after the engine is started, or comes on in the course of normal vehicle operation it means that the system has malfunctioned. The vehicle remains operational, but without ASC+T. You a have an 2001 3 series (E46), but I suspect the indicator lamp means the same as the E36 3 series. Look in owners manual under "indicator lamps"