System Inspection

Engine Control
P0272 Cylinder 4-Injector Circuit Balance (Load Drop is Detected) - Inspection/Repair:_:System Inspection

System Inspection

Check power balance
Reference
This test is to find out that possible cause of the problem is error in specific cylinder or fuel system.
Warm up the engine to normal operating temperature for getting a reliable result.

CAUTION:
Pull up the parking brake and shift the gear into "P" position before the test.

1. Warm up the engine and maintain idle state.
2. Using GDS, select engine rpm parameter in sensor display window and injector in actuation test window together as follow figure.
3. Recode engine rpm at a time when injector stops working after press "Start" button in actuation test window.
4. Repeat above test on all cylinders.

Specification:The deviation of the engine rpm between each cylinder should be same.








5. Does each cylinder show the similar engine rpm?
Specification
> Go to next precedure.

CAUTION:
> If there is no chang in engine rpm when injector stops working, it might be caused by fuel or ignition system error.

Reference
If engine rpm drops over 200rpm in power balance test, check engine internal damage by testing compression pressure with pressure gauge.
Check Air Leakage
1. Visually/physically inspect the air leakage in intake/exhaust system as following items
> Vacuum hoses for splits, kinks and improper connections.
> Throttle body gasket
> Gasket between intake manifold and cylinder head
> Seals between intake manifold and fuel injectors
2. Has a problem been found in any of the above areas?





3. Check for air leakage in purge system
- Remove vacuum hose between canister purge valve and intake manifold.
- Apply approx. 15inch HG vacuum to removed hose after blocking the one side.
- Is vacuum maintained?





Check fuel pressure
1. Check water or foreign substance in fuel
2. Install the fuel pressure gauge to the delivery pipe with the fuel pressure gauge adaptor.
3. Measure the fuel pressure at idle.

Specification:3.45 - 3.55 kg/mm2

4. Is the measured fuel pressure within specifications ?










Check Spark Pulg
1. Check spark pulg and ignition coil
(1) Visually/physically inspect the following items:
- Damaged insulation, Worn electrodes, Oil or fuel fouled, Loose terminals and cracks
- Loose contect of electrical wires
- Poor connection
(2) Measure resistance of spark pulg component.

Specification:5.6 k Ohms ± 20%

(3) Measure resistance of primary and secondary ignition coil.

Specification:
Primary ignition coil. : 0.56 - 0.68 Ohms( 20°C)
Secondary ignition coil : 6 - 8 kOhms( 20°C)

(4) Has a problem been found?





2. Check Spark Pulg
(1) Visually/physically inspect the following items:
- Damaged insulation, Worn electrodes, Oil or fuel fouled, Loose terminals and cracks
- Check for plug gap : 1.0 - 1.1 mm
(2) Has a problem been found?