Perform the function test. Refer to Function Test .

Did you find the air delivery incorrect?

Go to Step 2

System OK

Inspect the affected valve actuator for the following conditions:

Are the installations and connections correct?

Go to Step 4

Go to Step 3

Reinstall the valve actuator or repair the connections as needed. Refer to Vacuum Hose Harness Replacement .

Does the condition persist?

Go to Step 4

System OK

1. Disconnect the actuator from the valve.
2. Inspect the valve for the following conditions:

•	Proper travel

•	Proper effort

•	Spring correctly installed

Is the valve operating properly?

Go to Step 6

Go to Step 5

Repair the valve as needed.

Does the condition persist?

Go to Step 6

System OK

1. Remove the control assembly from the dash. Refer to Control Assembly Replacement .
2. Inspect the violet vacuum hose for engine manifold vacuum while the engine is operating.

Is the vacuum present?

Go to Step 7

Go to Step 8

Test for the following using a hand vacuum pump on each vacuum hose at the control assembly:

Did you find and repair the condition?

System OK

Go to Step 9

Inspect for vacuum source to the vacuum tank.

Did you find and repair the condition?

System OK

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Replace the control assembly. Refer to Control Assembly Replacement .

Does the condition persist?

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System OK