Suzuki GRAND VITARA 2005 Service Manual page 131

Table 5: Poor Performance with Smoke
NOTE
In the case of engine overheating to more than 119 °C, 246°F the computer deliberately limits the fuel
flow (overheating warning light illuminates from 115 °C, 239 °F).
Troubleshooting
Step
1 Is the poor performance accompanied by smoke?
2 Check the following:
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?
3 The conformity of the assembly of the injectors (presence
and conformity of the sealing washer).
Checking procedure:
• Take a straightedge approximately 40 cm (15.7 in.) long
and place it on the 4 injectors. The straightedge should
rest on the 4 injectors.
• If 1 injector protrudes, remove the injector and check that
the sealing washer is correct.
• If one injector does not touch the straightedge (clearance
of more than 1 mm (0.040 in.)), remove the injector and
check that there is a sealing washer.
• Clean the injector wells and the injector, refit the injector
with the correct sealing washer.
Is there in good condition?
4 Check the following:
The sealing and condition of the inlet circuit referring to "Test
3: Checking the turbocharged air inlet circuit: ".
The condition of the MAF sensor referring to "Test 4: MAF
sensor: ".
The turbocharger referring to "Test 5: Variable geometry
turbocharger control: " and "Test 6: Rotating part of a
turbocharger: ".
Check that the boost pressure follows the rise in the engine
speed and that the loop difference with the boost pressure is
low.
Is there in good condition?
Action
Engine General Information and Diagnosis:
Yes
Go to Step 2.
Go to Step 3.
Go to Step 4.
Go to Test 7 referring to
"Test 7: Exhaust gas
recirculation valve: ".
1A-99
S5JB0B1104158
No
Go to Table 6 referring
to "Table 6: Poor
Performance without
Smoke: ".
Carry out the required
repairs.
Carry out the required
repairs.
Replace turbocharger.