I want a circuit diagram of ecm of hyundai accent as i run a garage and i could repair a faulty ecm usin the diagram

Check the bulbs could be blown low beam

P0103 HYUNDAI - Mass or Volume Air Flow Circuit High InputPossible causes- Dirty mass air flow sensor
- Dirty mass air filter
- Mass air flow sensor harness is open or shorted
- Mass air flow sensor electrical circuit poor connection
- Intake air leaks
- Faulty mass air flow sensor
Tech notesBefore replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with low compress air or mass air flow sensor cleaner. Reset code and drive vehicle. If the code comes back, it may be necessary to replaced the mass air flow sensor.
P0112 HYUNDAI - Intake Air Temperature Sensor 1 Circuit Low InputPossible causes- Dirty air filter
- Intake air temperature (IAT) sensor harness is open or shorted
- Intake air temperature (IAT) sensor electrical circuit poor connection
- Faulty intake air temperature sensor
When is the code detected?An excessively low voltage from the sensor is sent to ECM.

I think the 2004 Accent only came with a 1.6 liter engine as far as I know. In any case below is as much information I have as far as your code including a wiring diagram of that circuit (CMP sensor). The wiring diagram doesn't tell the wire colors but does tell you where the wire goes or what "pin" number it is at the connectors. I included the connectors which is by number and marked the ECM connector for you. I had a picture of the CMP sensor location but not the ECM location but can tell you the ECM connector is located behind the dash fuse panel. Hope this helps....

Find the fuel pump relay, connect across the contacts from B+ to the fuel pump. This will make the pump run continuously. see if the engine stays running. It may be a bad relay or a relay feed circuit which is also run the the auto shut down switch. Lee

Normally if you can't get a reading from the ecm the ecm is dead, and goes to default mode meaning it will run ok but is at base timing and won't kick in to closed loop having the 02 sensor controlling fuel and timing, they did this because if the past if the ecm failed the car was a pull toy so you sat on the side of the road so the ecm could be bad. You could have someone do a pin out on the ecm but it would take more time than it would cost to replace the ecm.

Check to see if their is power going to the OBC...

Get a diagnosis first, it could be a faulty oxygen sensor, they're a lot cheaper than a catalyst! Worth shoping round for a cheaper diagnostic garage.

doesnt exist only block diagram

these immobilisers on hyundai are a chip installation in key ? considering age of car and use of ign key it may well be the worne key ist causing intermitant problem ? ask mother did she get either another ign master key or a tag with the key code number stamped on it for obtaining a replacement key with the car ? as with each new hyundai you get 2x keys and either one of the above with all documents/handbooks etc try hyundai main office b4 you consider trying to cut out immobiliser? this would affect your insurance if it is stolen and found to not have working immobiliser

Problem solved. I had no choice, but to have the car towed to the
Hyundai dealer and at first they thought it was the ECM...
... (Because it had no sparks)
Which is very expensive, $800.00 in Canada...
But finally it was only the power relay of the ECM... $30.00... ouf!
Sometimes it can only be the ground wire, that goes into the car.

I'm posting this, so that if someone else has the same problem
maybe this will help you.

Have a nice day!

Jim