Engine Abnormal Vibration on Idling,matrix

Another Trouble that for me to Explore, This trouble cause by loosed terminal ground and injector.
Model:Hyundai Matrix(FC).

Year Model: 2006
Mileage: 130782km
Fuel: Gasoline
Displacement: 1600cc
T/A: Auto
1) Trouble Condition:

• Engine Abnormal Vibration on Idling even the engine cold or hot condition.

2) Trouble Cause:

1. Due to Loosed ground terminal and clogged injector 1 & 4.

3) Diagnosis:

1. Scan tool check:
   = TR Switch
2. Check current data of engine:
   = some sensor indicated that not supported.
   a) Oxygen sensor.
   b) map sensor.
   c) coolant temperature sensor.
   d)battery voltage.
   e) data of injector is 13.5 (Abnormal)
3. Check the current data of TR switch : Normal operation.
4. Check compression test: Ok with in  specification.
5. Check spark from spark plug: Ok
6. Fuel pressure test: Ok
7. Visually check up.
8. I was observed that if the engine is running the main relay getting abnormal hot and visually Check that all terminal wire seems like melting indication that also terminals getting hot.
9. Check all wires, socket terminal and ground terminal .

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