Daewoo Musso. Manual - part 173

1F2-52  M161 ENGINE CONTROLS

Fuel Pressure Test

1. Turn the ignition switch to "OFF" position.

2. Remove the fuel pressure test connector.

     Vacuum Hose Connected (bar)

      3.2-3.6

Vacuum Hose Disconnected (bar)                3.7-4.2

5. Replace the pressure regulator diaphragm if out of the

specification.

3. Connect the fuel pressure gauge to the fuel pressure test

connector.

4. Test the fuel pressure at idling by operating the engine.

M161 ENGINE CONTROLS  1F2-53

3. If there is no change in fuel pressure and maintain the

following pressure over 30 minutes, it is normal.

Internal Leakage Test

1. Connect the fuel pressure gauge to the fuel pressure test

connector.

2. Stop the engine for approx. 30 minutes and then check the

fuel pressure changes.

Fuel pressure

drops slowly

·

Fuel leakage at the
injector

•

Faulty fuel pressure
regulator's
diaphragm and O-
ring.

Fuel pressure

drops rapidly

•

Faulty check valve
in the fuel pump.

    Possible Cause

Pressure Change

Fuel  Pressure(bar)

  2.5

Discharging the pressure in fuel system

1. Remove the fuel pressure test connector.

Installation Notice

2. Remove the fuel pressure in fuel system by pressing the

service valve with a clean, pointy tool.

Notice

Place a cloth so that the fuel doesn't stain around.

Tightening Torque

22.5 - 27.5 Nm

1F2-54  M161 ENGINE CONTROLS

INJECTOR

Preceding Work : Removal of fuel distributor

1 O-ring ................................. Replace, if damaged
2 Injector Bracket
3 Injector

4 O-ring ................................. Replace, if damaged
5 Fuel Distributor

M161 ENGINE CONTROLS  1F2-55

Removal & Installation Procedure

1. Remove the O-ring.

Check for damage and replace it if necessary.

2. Remove the injector bracket from the injector.

Installation Notice

Exactly seat the anti-twist lock into the square groove in
injector.

3. Separate the injector from the fuel distributor.

Inspection & Maintenance

Inspection of the Injector operation and spray pattern

1. Connect the contact box to the ECU.

2. Connect the shop made test plug to the injector and place

it into the tank.

3. Position the ignition switch to ON.

4. Connect the pin 63(+) and 69(-)  of the contact box with a

test cable.

5. Check the injector spray pattern.

Notice

Replace the injector if the injector spray pattern is abnormal
or the fuel doesn't inject.

Injector Resistance Inspection

1. Remove the injector connector.

2. Measure the injector coil resistance using a resistance

tester.

Notice

Replace the injector if the measured values is out of the
specified values. Check the connector and wire connection
between the ECU and the injector if the measured values
are normal.

Specified Value

14 - 17 

W