GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value

Yes

No

1

Check the tank valves.

Are the tank valves open?

--

Go to Step 3

Go to Step 2

2

Open both the valves on the tank.

Are the tank valves open?

--

System OK

--

3

Check the manifold valves.

Are the manifold valves open?

--

Go to Step 5

Go to Step 4

4

Open the valves on the manifold.

Are the valves open?

--

System OK

--

5

Check the components.

Are the components faulty?

--

Go to Step 6

System OK

6

Call Tech Assist. 1-800-345-2233.

Did you call Tech Assist.?

--

System OK

--