Santa Fe (Hyundai)

Subject: ENGINE HARD STARTING - INJECTOR (VGT)

1) Condition

a) Imposible to start engine (Cranking is Possible).
b) Possible to start the engine after replacing injector but the engine hesitates and white smoke is occurred.

2) Cause

a) The steel ball seems to be stuck the inside of injector.
b) Engine hesitation and white smoke occur due to the abnormal operation of the injector.

3) Diagnosis

a) Scan tool check
- no trouble code
- Check for the generation of fuel pressure by using current data mode.
- The fuel pressure is increase up to 5.5 bar when turning "ON" the ignition key.
b) Check the operation of injector (Electronic control line ) by using test lamp "T" connector.
- Disconnect the injector connector and connect the " T" connector.
- Check if the injector is controlled or not when cranking the engine.
- the injector is controlled normally.


Caution

The injector power which is given from ECM is inspected by using test lamp and " T " connector but confirm to the below.

a) Use let type of test lamp to prevent the damage in ECM.
b) Inspect by using " T " connector to prevent the damage in injector wire.

C) Remove the fuel pressure sensor from the common rail and connect it to high pressure pump and then, check for the generation of high pressure.

- The pressure is increase up to 1500 bar rapidly when cranking the engine (normal)
- Inspect the returned fuel quantity from injector.
- The returned fuel quantity of #2 is more excessive than the other cylinders when checking the returned fuel by using return tester.


* After replacing the #2 injector, possible to start the engine but hesitation and white smoke arenot disappeared when idling in cold condition.

1)Visually inspect the injector
- Removed all injector and inspect the carbon in the nozzle tip and sticking of the foreing material.(normal)
- Check the fuel leakage (normal)
- Different type of injector have been assembled whin checking the mark on injectors.
2) The engine operates normally after combining the injctor.

D) Repair guide

• this problem is accured because #2 injector is not injected when starting the engine and due to the poor contact of the steel ball. this symptom may be accured by abnormal fuel fuel, foreing material or sometimes water entering.
• The second cause of the malfunction is an incorrect injector.that is installed to vehicle.Due to the incorrect injector,engine hesitation and white smoke are accured in cold condition.In this case, the injector quantity is adjusted by ECM as time passes and, the simptom is disappeared. But it is better to replace the injector with normal one.
  

*these are various kinds of injectors, check the mark on injector and choose the applicable injector to its vehicle

a) 1. Bosch japan
2. Small " Y " mark (white collor)
3. For VGT (961)
4. Part number : 33600-27900

b) 1.Bosch korea.
2." V " Mark
3. Big " Y " mark
4. For VGT (539)
5. Part number : 33800-27900

C) 1. Bosch korea
3. WD mrk
4. For WGT (539)
5. Part number : 33800-27010

D) 1.Bosch japan
2. No mark
4. For WGT & (961)
5. Part number 33800-27000

E) 1. Bosch japan
2. No mark
4. For WGT & (961)
5. Part no: 33800-27010
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