Pinpoint Test A: Vacuum Control System Tests - Twin Turbo Variants Only

1. With the ignition switched off, disconnect the vacuum vent hose from the air filter housing at point TP1
2. Connect a hand operated vacuum pump into the circuit at point TP1 and apply a vacuum

Can a vacuum be achieved and maintained?

• Yes  : GO to  A2.
• No  : Suspect air leak, carry out a smoke test to identify the leak point. If a leak is identified, repair fault and repeat step  1 to confirm repair

1. Disconnect the vacuum vent hose from the turbine intake shut-off valve solenoid at point TP2
2. Connect the vacuum pump to the vent hose at point TP2 and apply a vacuum

Can a vacuum be achieved?

• Yes  : Check the vacuum vent hose for a blockage between the turbine intake shut-off valve solenoid and the air filter housing
• No  : If a vacuum cannot be achieved the vent hose is functioning correctly

  Repeat the test for the charge air shut-off valve vent hose connecting the gauge at point TP3

  If the turbine intake shut-off valve and the charge air shut-off valve vent hoses are functioning correctly GO to  A3

1. Using the Jaguar Land Rover Approved Diagnostic Equipment, check datalogger signals - Turbo Shut-off valve opening position - Measured (0x03F1)  and Turbo Shut-off valve opening position - Commanded (0x03F0) 

With the ignition on and the engine off is the value for signal Turbo Shut-off valve opening position - Measured <4%?

• Yes  : GO to  A4.
• No  : Suspect turbine intake shut-off valve is faulty and sticking open

  Install a new turbine intake shut-off valve

  After installing a new turbine intake shut-off valve, carry out the calibration procedure. Using the Jaguar Land Rover Approved Diagnostic Equipment, perform routine - Powertrain set-up - Turbine shut-off valve

1. Connect a hand operated vacuum pump to the charge air shut-off valve hose at point TP4
2. Check the operation of the charge air shut-off valve by gradually applying a vacuum and then releasing it while observing charge air shut-off valve actuator connecting rod
3. NOTE: A clunk can be heard from the charge air shut-off valve as it closes

Did the charge air shut-off valve open as a vacuum was applied and close when the vacuum was released?

• Yes  : GO to  A6.
• No  : GO to  A5.

1. Connect a hand operated vacuum pump directly to the charge air shut-off valve at point TP5
2. Check the operation of the charge air shut-off valve by gradually applying a vacuum and then releasing it while observing charge air shut-off valve actuator connecting rod
3. NOTE: A clunk can be heard from the charge air shut-off valve as it closes

Did the charge air shut-off valve open as a vacuum was applied and close when the vacuum was released?

• Yes  : Suspect blockage in the vacuum hose between the charge air shut-off valve solenoid and charge air shut-off valve Inspect vacuum hose for blockages/defects and rectify as required
• No  : Suspect a faulty charge air shut-off valve

  Install a new charge air shut-off valve

1. Connect a hand operated vacuum pump using a 'T' piece between the charge air shut-off valve and the charge air shut-valve solenoid at point TP4
2. Start the engine and allow to idle. View the vacuum reading while in mono turbo mode (during the first three minutes

Is a vacuum present?

• Yes  : Remove and inspect the charge air shut-off valve solenoid. Suspect solenoid stuck open. Replace as required
• No  : GO to  A7.

1. With the hand operated vacuum pump still connected at point TP4 via the "T" piece
2. Using the Jaguar Land Rover Approved Diagnostic Equipment, check datalogger signals - Turbo Shut-off valve opening position - Commanded (0x03F0)  and Turbo Shut-off valve opening position - Measured (0x03F1) 
3. After approximately 3 minutes at idle the turbine intake shut-off valve and charge air shut-off valve will automatically be triggered to open and activate the secondary turbo
4. This can be confirmed by datalogger signal - Turbo Shut-off valve opening position - Commanded  changing value to 100%
5. When this occurs a vacuum of approximately 800mbar should be displayed on the gauge
6. Observe the value on the vacuum gauge as the secondary turbo is activated

Is the correct vacuum achieved and maintained?

• Yes  : GO to  A8.
• No  : GO to  A9.

1. With the engine idling in bi-turbo mode an increase in engine speed will return the engine to mono turbo mode
2. Increase engine speed and then allow the engine to return to idle
3. The vacuum will return to zero (within 2-3 seconds)
4. Observe the value on the vacuum gauge as the secondary turbo is deactivated

Is the correct vacuum is achieved and maintained?

• Yes  : GO to  A10.
• No  : Check that the datalogger signal - Turbo Shut-off valve opening position - Commanded (0x03F0)  has changed to 0%. If remove and inspect the charge air shut-off valve solenoid. Suspect solenoid stuck open. Replace as required

1. Connect the vacuum pump with gauge to the charge air shut-off valve solenoid vacuum supply hose at point TP6
2. Start the engine and allow to idle
3. Observe the gauge, a vacuum of approximately 800mbar should be displayed

Is the correct vacuum achieved and maintained?

• Yes  : Remove and inspect the charge air shut-off valve solenoid. Suspect solenoid stuck closed. Replace as required
• No  : GO to  A18.

1. Connect a hand operated vacuum pump using a 'T' piece between the turbine intake shut-off valve and the turbine intake shut-off valve solenoid at point TP7
2. Start the engine and allow to idle. View the vacuum reading while in mono turbo mode (during the first three minutes

Is a vacuum present?

• Yes  : Remove and inspect the turbine intake shut-off valve solenoid. Suspect solenoid stuck open. Replace as required
• No  : GO to  A11.

1. With the hand operated vacuum pump still connected into the circuit at point TP7
2. Allow the engine to idle
3. Using the Jaguar Land Rover Approved Diagnostic Equipment, record datalogger signals - Turbo Shut-off valve opening position - Commanded (0x03F0)  and Turbo Shut-off valve opening position - Measured (0x03F1) 
4. After approximately 3 minutes at idle the turbine intake shut-off valve will automatically be triggered to open and activate the secondary turbo
5. This can be confirmed by datalogger signal - Turbo Shut-off valve opening position - Commanded  changing value to 100%
6. When this occurs a vacuum of approximately 800mbar should be displayed on the gauge
7. Observe the value on the vacuum gauge as the secondary turbo is activated

Is the correct vacuum is achieved and maintained?

• Yes  : GO to  A12.
• No  : GO to  A17.

1. Look at the recorded datalogger signals 1 - Turbo Shut-off valve opening position - Commanded (0x03F0)  and 2 - Turbo Shut-off valve opening position - Measured (0x03F1) 

Is the measured value for the turbo shut-off valve 98% or greater? (See screenshot for reference)

• Yes  : GO to  A13.
• No  : GO to  A19.

1. Look at the recording for the datalogger signal 2 - Turbo Shut-off valve opening position - Measured (0x03F1) 

Does the signal show the valve moving smoothly and continuously to its maximum open position? (Refer to screenshot in A12)

• Yes  : GO to  A14.
• No  : Suspect valve is sticking. Replace faulty turbine intake shut-off valve

  After installing a new turbine intake shut-off valve, carry out the calibration procedure. Using the Jaguar Land Rover Approved Diagnostic Equipment, perform routine - Powertrain set-up - Turbine shut-off valve

1. Using the Jaguar Land Rover Approved Diagnostic Equipment, record datalogger signals - Turbo Shut-off valve opening position - Commanded (0x03F0)  and Turbo Shut-off valve opening position - Measured (0x03F1) 
2. If the engine speed is increased from idle then the turbine shut-off valve will automatically close returning to mono turbo mode
3. Increase engine speed and then allow the engine to return to idle
4. The vacuum will drop back to zero (within 2-3 seconds)
5. Observe the value on the vacuum gauge as the secondary turbo is deactivated

Is the correct vacuum achieved and maintained?

• Yes  : GO to  A15.
• No  : Check that the datalogger signal - Turbo Shut-off valve opening position - Commanded (0x03F0)  has changed to 0%. If remove and inspect the charge air shut-off valve solenoid. Suspect solenoid stuck open. Replace as required

1. Look at the recorded datalogger signals 3 - Turbo Shut-off valve opening position - Commanded (0x03F0)  and 4 - Turbo Shut-off valve opening position - Measured (0x03F1) 

Did the signal value for Turbo Shut-off valve opening position - Measured  change to <4%? (See screenshot for reference)

• Yes  : GO to  A16.
• No  : Suspect turbine intake shut-off valve is sticking

  Install a new turbine intake shut-off valve

  After installing a new turbine intake shut-off valve, carry out the calibration procedure. Using the Jaguar Land Rover Approved Diagnostic Equipment, perform routine - Powertrain set-up - Turbine shut-off valve

1. Look at the recorded datalogger signals 3 - Turbo Shut-off valve opening position - Commanded (0x03F0)  and 4 - Turbo Shut-off valve opening position - Measured (0x03F1) 

Does the signal show the valve moving smoothly and continuously to its minimum closed position? (Refer to screenshot in A15)

• Yes  : No fault present. Exit pin point test
• No  : Suspect turbine intake shut-off valve is sticking

  Install a new turbine intake shut-off valve

  After installing a new turbine intake shut-off valve, carry out the calibration procedure. Using the Jaguar Land Rover Approved Diagnostic Equipment, perform routine - Powertrain set-up - Turbine shut-off valve

1. Connect the vacuum pump with gauge to the turbine intake shut-off valve solenoid vacuum supply line at point TP8
2. Start the engine and allow to idle
3. Observe the gauge, a vacuum of approximately 800mbar should be displayed

Is the correct vacuum is achieved and maintained?

• Yes  : Remove and inspect the turbine intake shut-off valve solenoid. Suspect solenoid stuck closed. Replace as required
• No  : GO to  A18.

1. Switch off the engine and the ignition
2. With the hand operated vacuum pump still connected into the circuit at point TP8, apply a vacuum

Does it hold vacuum pressure?

• Yes  : Look for air leaks on the vacuum supply line between the non return valve and the vacuum pump

  Carry out smoke test to identify leak point

  Check the output pressure directly at the vacuum pump

• No  : Suspect air leak in vacuum supply line between the non return valve and the turbine intake shut-off valve/charge air shut-valve solenoids

  Carry out smoke test to identify leak point. Repair/replace as required

1. Connect a hand operated vacuum pump directly to the secondary turbocharger turbine intake shut-off valve at point TP9
2. Gradually apply a vacuum and observe the turbine intake shut-off valve actuator and monitor the position sensor signal datalogger

Does the turbine intake shut-off valve operate and is this reflected by signal 5 - Turbo Shut-off valve opening position - Measured (0x03F1)  value?

• Yes  : Suspect blockage in vacuum supply line between the turbine intake shut-off valve and charge air shut-off valve solenoid

  Inspect hose for defect and rectify as required

• No  : Turbine intake shut-off valve failure

  Install a new turbine intake shut-off valve

  After installing a new turbine intake shut-off valve, carry out the calibration procedure. Using the Jaguar Land Rover Approved Diagnostic Equipment, perform routine - Powertrain set-up - Turbine shut-off valve