Suzuki Grand Vitara JB419. Service manual — part 30

Engine General Information and Diagnosis: 1A-97

Table 4: Injection Noise

S5JB0B1104157

Troubleshooting

Step

Action

Yes

No

1

If injection noise occurs after starting from cold:
Check the priming of the low pressure fuel circuit.
Check the fuel heater supply.
Check the operation of the preheating system.
Check that fuel and engine temperatures are consistent.

Is there in good condition?

Go to Step 2.

Carry out the required
repairs.

2

If the injection noises occur at idling speed:
Check the condition of the injector connector and pressure
regulator terminals.
Check the conformity of the air flow signal “MAF” on Data
List of SUZUKI scan tool or perform test 3 referring to “Test
3: Checking the turbocharged air inlet circuit”.

Is there in good condition?

Go to Step 3.

Carry out the required
repairs.

3

If the injection noise occur at all engine speeds:
Perform fault finding on the injectors referring to “Test 8:
Injector malfunction”.
Check the condition of the injector connector and pressure
regulator terminals.
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 fuel filter.
• Bleed the low and high pressure diesel circuit.
Check the conformity of the air flow signal “MAF” on Data
List of SUZUKI scan tool.

Is there in good condition?

End of fault finding.

Carry out the required
repairs.

1A-98 Engine General Information and Diagnosis:

Table 5: Poor Performance with Smoke

S5JB0B1104158

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

Action

Yes

No

1

Is the poor performance accompanied by smoke?

Go to Step 2.

Go to Table 6 referring
to “Table 6: Poor
Performance without
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?

Go to Step 3.

Carry out the required
repairs.

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?

Go to Step 4.

Carry out the required
repairs.

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?

Go to Test 7 referring to
“Test 7: Exhaust gas
recirculation valve”.

Replace turbocharger.

Engine General Information and Diagnosis: 1A-99

Table 6: Poor Performance without Smoke

S5JB0B1104159

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

Action

Yes

No

1

Is the engine running on all cylinders?

Go to Step 2.

Check the injector
operation referring to
“Test 8: Injector
malfunction”.

2

Check the conformity of the accelerator pedal position
sensor, the brake lamp switch, the boost pressure sensor,
the EGR valve and the inlet throttle valve.

Is there in good condition?

Go to Step 3.

Carry out the required
repairs.

3

Check the consistency of the signal: of the MAF sensor, of
the ECT sensor and of the engine speed.
Check the connections, the continuity and absence of
interference resistance of the MAF sensor (refer to “DTC
P0100: Mass or Volume Air Flow Circuit Malfunction” of
troubleshooting for 2.DEF: Offset at minimum threshold.), of
the ECT sensor (refer to “DTC P0115: Engine Coolant
Temperature Circuit Malfunction”), and the engine speed
(refer to “DTC P0016: Crankshaft Position-Camshaft
Position Correlation Malfunction”).

Is there in good condition?

Go to Step 4.

Carry out the required
repairs.

4

Check the following:
• Diesel filter not clogged (for the test, refer to “DTC P0089:

Fuel Pressure Regulator 1 Performance Malfunction” of
troubleshooting for 2.DEF: Measured pressure too low.).

• There are no leaks on the low and high pressure air

circuits referring to “Test 3: Checking the turbocharged air
inlet circuit”.

• The oil vapour rebreathing system is connected.
• The fuel flow actuator (blocked/seized, perform output

test “IMV/Flow actuator” on SUZUKI scan tool.).

• The engine timing (and the position of the high pressure

pump sprocket).

Is there in good condition?

Go to Step 5.

Carry out the required
repairs.

5

Are the compressions correct?

End of fault finding.

Carry out the required
repairs.

1A-100 Engine General Information and Diagnosis:

Table 7: Irregular Engine Operation

S5JB0B1104160

Troubleshooting

Step

Action

Yes

No

1

If the engine races during gear changes, check, if there is a
floor carpet, that this is not blocking the accelerator pedal,
the brake pedal and the clutch pedal, then check the
conformity of the clutch switch and the conformity of the
accelerator pedal sensor when the pedal is released.

Is there in good condition?

Go to Step 2.

Carry out the required
repairs.

2

Check the following:
• CKP sensor and its circuit (refer to “DTC P0335:

Crankshaft Position Sensor “A” Circuit Malfunction”.).

• Check that the engine earthing is in order (oxidation,

tightness, etc.).

• Check the mounting, the air gap and the condition of the

sensor (overheating).

Is there in good condition?

Go to Step 3.

Carry out the required
repairs.

3

Low pressure circuit check.
Check the fuel flow actuator by applying Step 12 of the
“Table 9: Rough idle” finding table.
The sealing and condition of the inlet circuit referring to “Test
3: Checking the turbocharged air inlet circuit”.
The condition of the air flow 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”.

Is there in good condition?

Go to Step 4.

Carry out the required
repairs.

4

Are the compressions correct?

End of fault finding.

Carry out the required
repairs.