EGR Vacuum Solenoid Valve Tests (1993-1995 2.2L Buick Century, Oldsmobile Cutlass Ciera)

TEST 2: Applying 12 Volts And Ground To The EGR Vacuum Solenoid

In this test section, we're going to apply 12 Volts and Ground to the EGR vacuum solenoid using jumper wires.

The 12 Volts and Ground we'll need will come from your vehicle's battery.

With power and Ground, the EGR vacuum solenoid should open and let air pass from its inlet port to its outlet port.

This is a pretty easy test, but you must take certain precautions. I suggest that:

• You use jumper wires with insulated alligator clips.
• One of the jumper wires should have an inline fuse.

NOTE: Perform this test with the EGR vacuum solenoid removed from its location on the intake manifold.

These are the test steps:

1. 1

   Connect a vacuum hose to the vacuum solenoid's inlet port.

2. 2

   Connect the red jumper wire to the terminal labeled with the letter B in the illustration above.

3. 3

   Connect the other end of the red jumper wire to the battery positive (+) post .

4. 4

   Connect the black jumper wire to the terminal labeled with the letter A.

5. 5

   Connect the other end of the black jumper wire to the battery negative (-) post.

6. 6

   The EGR vacuum solenoid should produce an audible click.

7. 7

   Blow air through the vacuum hose connected to the solenoid's inlet port.

8. 8

   The air should pass from its inlet port to its outlet port.

Let's interpret your test result:

CASE 1: The EGR vacuum solenoid activated and let air pass thru to its outlet port. This is the correct test result.

Even tho' the solenoid is activating and letting air pass thru; you need to check one more thing. Go to: TEST 3: EGR Vacuum Solenoid Resistance Test.

CASE 2: The EGR vacuum solenoid DID NOT activate and DID NOT let air pass thru to its outlet port. This test result tells you the EGR vacuum solenoid is defective and needs replacement.

TEST 3: EGR Vacuum Solenoid Resistance Test

For our last test, we'll resistance test the EGR vacuum solenoid with a multimeter in Ohms mode.

If the EGR vacuum solenoid is OK, you should see a resistance of around 20 Ohms.

Let's get started:

1. 1

   Place your multimeter in Ohms mode.

2. 2

   Connect the red multimeter test lead to the male terminal labeled with the letter B.

3. 3

   Connect the black multimeter test lead to the male terminal labeled with the letter A.

4. 4

   Your multimeter should register a resistance value of around 20 Ohms.

Let's take a look at what your test results mean:

CASE 1: The resistance of the EGR vacuum solenoid is around 20 Ohms. This is the correct and expected test result.

NOTE: If the test result of TEST 2 confirms that the EGR valve vacuum solenoid DOES NOT open, even though its internal resistance is within the specified range, the solenoid is bad and needs replacement.

CASE 2: The resistance is not within the indicated range. With this test result, you can conclude that the EGR vacuum solenoid is bad and needs replacement.

NOTE: Even if the solenoid passed TEST 2, but its resistance is not within the indicated range, the vacuum solenoid is bad and needs replacement.

More 2.2L Buick Century And Oldsmobile Cutlass Ciera Test Tutorials

NOTE: If this tutorial was helpful, be sure and take a look at all of the 2.2L Buick Century and Oldsmobile Cutlass Ciera diagnostic tutorials in this index:

• GM 2.2L Index Of Articles.

Here's a sample of the tutorials you'll find there:

• How To Test The Fuel Pump (1993-1996 2.2L Buick Century, Oldsmobile Cutlass Ciera).
• How To Test The TPS (1993-1996 2.2L Buick Century, Oldsmobile Cutlass Ciera).
• How To Test Engine Compression (1993-1996 2.2L Buick Century, Oldsmobile Cutlass Ciera).
• How To Test The MAP Sensor (1993-1996 2.2L Buick Century, Oldsmobile Cutlass Ciera).