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Re: I need engine electronic control system diagram...
The engine light is telling you that the CPU has found sensor/s outside set parameters during the checking process. Have the fault codes read before wasting time and money guessing what has failed. Replace with genuine items only as aftermarket units are not always compatible with the settings in the CPU.
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The CHECK engine light means Malfunction Indication Lamp (MIL). It is a yellow colored indicator which always keep the driver of the car informed about the performance of the engine sensors and the Electronic Control Module (ECM). It is always in the OFF state when the engine is running. If it becomes on while the engine is running it become necessary to get the car be checked and scanned for any one or more problems which have occurred in the Electronic Fuel Injection (EFI) system.
Hello When the service engine
soon light (Also called the check engine light or engine management
light) is turned on this is to alert you to the fact that Powertrain
Control Module (computer) has detected a failure somewhere in the
systems it controls you may not feel any difference in the way the
engine runs, this can be the transmission or the engine or emission
system, there are fault codes set in the modules memory for these
faults. What needs to happen now is to have the powertrain control
module scanned with a special tool called an OBD2 electronic engine
control scanner or a OBD2 code reader. Once the code(s) are read then
you must perform the diagnostics for each code and make the
appropriate repairs based on the findings of the diagnosis that was
performed, this is called doing "Pinpoint" testing.
The information below was complied by me, it explains what causes the check engine light to come on and the process of finding the cause. When the Check Engine light (or Service Engine Soon or small picture of an engine) is turned on, the systems computer control unit (called the PCM) has sensed a fault in the electronic controls of the engine and/or the emission system. When this happens you will seldom feel the car engine run any different. There are about 200 possible system faults (the gas cap is just one of them) that turn the Check Engine light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test.
DTC P0440 code indicates that a part of the EVAP
control system is no longer fuctioning correctly. The EVAP system consists
of many parts, including (but not limited to) the gas cap, fuel lines, carbon
canister, purge valve, and other hoses. The (EVAP) emission
control system prevents the escape of fuel vapors from a vehicle's fuel system.
Fuel vapors are routed
to a charcoal canister for storage. Later, when the engine is running a purge
control valve opens allowing intake vacuum to siphon the fuel vapors into
engine. A code P0440 could mean one or more of the following has happened:
The gas cap is not installed or working properly
The purge solenoid has failed
The canister is plugged and not working properly
Additional details could find in this links Fault Codes
on Cars & Trucks or other diagrams in Cars &
Trucks Vacuum Diagram.
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The 04 Santa Fe came with three different engines. 4 cylinder (2.4 lit), and two different V6's (2.7 lit & 3.5 lit). The 2.4 & 2.7 use throttle cables connected directly to the throttle plate, but the 3.5 uses ETS (Electronic Throttle System) which uses two sensors (APS & TPS) and a control module (ETSCM). APS=Accelerator Position Sensor, TPS=Throttle Position Sensor, ETSCM= Electronic Throttle System Control Module. There are different diagnostic procedures for each system. Go to www.hmaservice.com and register your vehicle by VIN #.. you'll then have access to wiring diagrams, shop manuals, service bulletins, campaigns, illustrations and procedures, etc.
The Check engine light comes on when the computer control unit (called the PCM) senses a fault in the electronic controls of the engine and/or the emission system you will seldom feel the car engine run any different, 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.
there is no need to worry about this light, but it will have to be attended to soon, it will not hurt the car to run it with the light on, read below why this service engine light comes on, could not have written this better myself. this light is called different things by different car makers, this explanation is generic and applies to all cars made after 1996 by federal law.
Why my Check Engine/Service Engines Soon light comes on? The engine computer or PCM/ECM All modern vehicles have a computer or the ECM (Electronic Control Module) that controls the operation of the vehicle powertrain (the engine and transmission). The main purpose of this is to keep the engine running at top efficiency with the lowest possible emissions. With constantly growing demands for better fuel economy and new strictest emission regulations it's not very easy to achieve. The engine parameters need to be constantly and precisely adjusted according to various conditions such as speed, load, engine temperature, gasoline quality, ambient air temperature, road conditions, etc. That's why today's cars have much more electronics than in early days - there is a large number of various sensors and other electronic devices that help the vehicle computer or ECM to precisely control the engine and transmission operation and monitor emissions. The vehicle computer system has self-testing capability. When the computer senses that there is a problem with some of the components it stores the correspondent trouble code(s) in its memory and lights up the "Check Engine" or "Service Engine Soon" light to tell you that there is a problem and your car needs to be looked at. To properly diagnose what is wrong, you need to take your car to a mechanic or a dealer. The technician at the dealership or a garage will then hook up the scanner to the car computer and retrieve the stored trouble code(s). Then he (she) will look it up in the service manual provided by a car manufacturer. The service manual contains the list of possible codes (about few hundreds) and describes what each code means and what needs to be tested. The code itself doesn't tell exactly what component is defective - it only indicates where to look, what engine parameter is out of normal range. The technician will have to perform further testing to pinpoint a defective part