GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

1

Does the ignition switch operate normally?

Go to Step 2

Go to Step 4

2

Does the main relay operate normally?

Go to Step 3

Go to Step 5

3

Does the PCV relay operate normally?

System OK

Go to Step 6

4

Replace the ignition switch assembly.

Did you complete the replacement?

Go to Step 7

--

5

Replace the main relay.

Did you complete the replacement?

Go to Step 7

--

6

Replace the PCV relay.

Did you complete the replacement?

Go to Step 7

--

7

Does the engine stop when ignition is turned OFF?

System OK

Go to Step 1