Test 2: Low Pressure Circuit Check - Suzuki Grand Vitara 2011 Manual

1A-369 Engine General Information and Diagnosis: For Diesel Engine Model

Test 2: Low pressure circuit check

Step
1 Check the fuel filter:
• Conformity of the fuel filter.
• Positioning and degree of contamination of the filter
cartridge.
• Positioning and condition of the seals.
• If there is metal swarf in the filter:
Replace the fuel filter, bleed the circuit and continue the
fault finding procedure.
Is there in good condition?
2 Supplying the injection system with fuel from an additional
tank.
This operation aims to detect possible faults in the low
pressure supply system of a vehicle by replacing it entirely
with an additional tank.
Mode:
• Disconnect the diesel fuel supply pipe at the fuel filter inlet
and seal it with a plug.
• Connect a pipe to the fuel filter inlet and insert the other
end in a clean container of approximately 5 liters.
• Disconnect the diesel fuel return pipe at the pump return
and injector leak-off junction and seal it with a plug.
• Fill the container with clean diesel fuel.
• Start the engine and let the system drain itself of its air
(there must not be any air bubbles in the return pipe).
Does the customer complaint persist?
3 Are the low pressure circuit connections in order and in good
condition?
4 Check the condition of the priming pump, and that it is
working properly. Perform repairs if necessary and continue
the test.
Is there in good condition?
5 If the fault is still present with a low fuel level, check the
consistency of the actual fuel level and that indicated on the
combination meter.
• The fuel pump is supplied via a venturi pipe located
underneath it.
Check that the opening of the venturi (6 to 8 mm (0.24 to
0.31 in.) in diameter) is not blocked by dirt contained in the
fuel tank. Check the priming of the low pressure diesel fuel
circuit.
Is there in good condition?
6 Ensure that the correct fuel is being used:
• Smell and compare the fuel with unpolluted diesel fuel:
to detect petrol, solvent, thinner, sulphuric acid (fuel with a
white colour), water or fuel oil.
If the diesel fuel is not correct:
• Replace the diesel fuel.
• Change the diesel filter.
• Bleed the low and high pressure diesel circuit.
Is there in good condition?
Action Yes
Go to Step 2.
If the low pressure
circuit is in order,
reconnect the different
pipes of the low
pressure circuit and
repeat the fault finding
of the fault finding chart
or of the fault that
referred you to this test.
Go to Step 4.
Go to Step 5.
Go to Step 6.
Low-pressure circuit
correct.
S6JB0A1124167
No
Repair or replace the
defective part.
Go to Step 3.
Carry out the necessary
repairs.
Repair or replace the
defective part.
Repair or replace the
defective part.
Repair or replace the
defective part.