Natural Vacuum Leak Detection (NVLD) Repair Procedures

Removal

1. 1
   Turn the ignition switch OFF and disconnect the negative (-) battery terminal.
2. 2
   Disconnect the NVLD connector (A).
3. 3
   Disconnect the vent hoses (B, C).

   

4. 4
   Remove the NVLD by loosening the bolts (A).

   

Installation

• Install the component with the specified torque.
• Note that internal damage may occur if the component is dropped. If the component has been dropped, inspect it before installation.

1. Install in the reverse order of removal.

NVLD mounting bolt: 2.3 ~ 3.3 N·m

Inspection

1. 1
   Turn the ignition off.
2. 2
   Disconnect the NVLD connector.
3. 3
   Remove the NVLD.
4. 4
   Connect the hose (A) to the canister hose connection port as shown below.
5. 5
   After submerging the hose (A) in water, apply more than 6 mbar (positive) pressure to the atmospheric pressure port (B).
6. 6
   If the NVLD is normal, a large number of bubbles indicates a large leak.

   An allowable internal leak of 0.35 g/h at 3 mbar will appear as one bubble every second (approximately).

7. 7
   Connect the power supply line and the ground line to the NVLD terminals as shown below.
8. 8
   Measure the current between NVLD terminal 1 and the battery (+) terminal when the NVLD switch is open.
9. 9
   Measure the current between NVLD terminal 1 and the battery (+) terminal when the NVLD switch is closed.
10. 10
    Measure the current between NVLD terminal 2 and the battery (+) terminal when the NVLD switch is open.
11. 11
    Make sure the current is within specification.

    The NVLD switch is normally open. When more than 6 mbar (positive) pressure is applied to the canister port, the switch closes.