Suzuki Grand Vitara 2011 Manual page 380

1A-311 Engine General Information and Diagnosis: For Diesel Engine Model
Check that the turbocharger and its control circuit are working:
• With the engine switched OFF, make sure the control rod is in the resting position.
• Start the engine and make sure that the control rod operates to the high stop. (when the engine stops, the
control rod must return to the resting position).
If the control shaft does not move correctly, carry out the following checks:
1. Vacuum pressure command check:
a. Disconnect the solenoid valve intake hose and connect it to a vacuum pressure gauge.
b. Start the engine and stabilise it at idle speed.
If the vacuum pressure does not reach 70 – 90 kPa (0.7 – 0.9 kg/cm
pressure circuit from the vacuum pump.
c. Stop the engine, reconnect the inlet hoses and go to Step 2.
2. Solenoid valve control check:
a. Disconnect the solenoid valve outlet hose.
b. Start the engine and stabilise it at idle speed.
c. Place your hand on the solenoid valve and block the outlet connection with your thumb.
If there is no detectable vibration of the solenoid valve, check that the ECM output is working correctly
(Refer to "DTC P0033: Boost Pressure Control Solenoid Valve Control Circuit: For Diesel Engine Model"
D1).
3. Solenoid valve functioning check:
a. Attach the pressure gauge to the solenoid valve outlet connection.
b. Start the engine and stabilise it at idle speed.
c. If the vacuum pressure does not reach 70 – 90 kPa (0.7 – 0.9 kg/cm
pressure control solenoid valve.
Troubleshooting for D2: Pressure too high
Check the boost pressure sensor connections.
Check the connections of the boost pressure control solenoid valve.
Check the ECM connections.
Repair if necessary.
Check the conformity of the turbocharging pressure signal. (Refer to "Turbo Pressure" on Data List of SUZUKI
scan tool).
Make sure the turbocharging limit solenoid valve is not blocked open:
• With ignition switch OFF, disconnect the inlet and outlet hoses from the solenoid valve.
• Connect a vacuum pump to the inlet union and apply a vacuum.
• If the vacuum pressure is not maintained: replace the boost pressure control solenoid valve.
Check that the turbocharger control rod has not seized:
• With the engine stopped, make sure the turbocharger control shaft is in the rest position.
• Apply a vacuum of 70 – 90 kPa (0.7 – 0.9 kg/cm
control diaphragm.
• If the diaphragm holds the vacuum pressure, check the movement and setting of the turbocharger control rod
referring to "Turbocharger Assembly Inspection: For F9Q Engine in Section 1D".
If the control rod is seized, replace the turbocharger.
If the fault persists, perform Test 5 and 6 of Fault Finding-Tests referring to "Test 5: Variable geometry
turbocharger control: For Diesel Engine Model" and "Test 6: Rotating part of a turbocharger: For Diesel Engine
Model".
2 , 9.9 – 12.8 psi), to the hose connecting the turbocharger
2 , 9.9 – 12.8 psi): check the vacuum
, 9.9 – 12.8 psi), replace the boost
2