- a) Disconnect hoses No.0, No.2 and No.3 from the solenoid valves.
- b) Insert the plug into hose No.3.
- c) Create a vacuum of 500 mmHg in the NsO hose and ensure that the vacuum decreases by no more than 45 mmHg in 15 seconds.

2. Check the diaphragm of the center differential lock engagement.
- a) Disconnect hoses No.1 and No.2 from the solenoid valves.
- b) Create a vacuum of 500 mmHg in hose #1 and ensure that the vacuum decreases by no more than 45 mmHg within 15 seconds.

3. Check the center differential lock release diaphragm.
- a) Disconnect hoses No.0, No.1, No.2 and No.3 from the solenoid valves.
- b) Insert the plug into hose No.3.
- c) Create a vacuum of 500 mmHg in hoses No.0 and No.2 and make sure that the vacuum decreases by no more than 45 mmHg within 15 seconds.
Caution: Simultaneously create a vacuum in hoses No.0 and No.2.

- d) Install the hoses on the solenoid valves.
Caution: Make sure all hoses are properly installed and securely fastened to the solenoid valves.

