APP Sensor Tests (2004 4.2L Oldsmobile Bravada, 2004-2007 4.2L Buick Rainier)

TEST 4: APP Sensor 2 Resistance Tests (2 Of 2)

In this last test section, you'll test the resistance of the circuit between terminals B and C as you depress and then release the accelerator pedal.

If the APP sensor 2 circuit between terminals B and C is OK, you'll see the multimeter report:

• The resistance decreases as you depress the accelerator pedal.
• The resistance increases as you release the accelerator pedal.

If the circuit between terminals B and C is bad, you'll usually see the multimeter report a resistance value that stays stuck in one number as you depress/release the accelerator pedal.

OK, these are the test steps:

1. 1

   Disconnect the APP sensor assembly from its electrical connector.

2. 2

   Place your multimeter in Ohms mode.

3. 3

   Connect one multimeter test lead to terminal B.

4. 4

   Connect the other multimeter test lead to terminal C.

5. 5

   Note the Ohms reading on your multimeter.
   
   At this point you'll see a resistance reading somewhere between 0.5K to 1K Ohms.
   
   If you don't, don't worry. Continue to the next step.

6. 6

   Slowly depress the pedal by hand till it bottoms out.

7. 7

   The resistance value should increase as you depress the pedal.

8. 8

   Slowly release the accelerator pedal.

9. 9

   The resistance value should decrease back to the original value you saw in step 5.

Let's examine your test results:

CASE 1: The resistance increased/decreased without any gaps between terminals B and C. This is the correct test result and lets you know APP sensor 2 is working correctly.

If APP sensor 1 and APP sensor 2 have passed all the tests in this tutorial, you can conclude the accelerator pedal assembly does not need to be replaced.

CASE 2: The resistance DID NOT increase between terminals B and C. This lets you know APP sensor 2 is bad.

Replace the accelerator pedal assembly.

CASE 3: The resistance DID NOT decrease between terminals B and C. This lets you know APP sensor 2 is bad.

Replace the accelerator pedal assembly.

CASE 4: The resistance DID NOT increase/decrease between terminals B and C. This lets you know APP sensor 2 is bad.

Replace the accelerator pedal assembly.

More 4.2L Oldsmobile Bravada And Buick Rainier Tutorials

You can find a complete list of 4.2L Oldsmobile Bravada and Buick Rainier tutorials and wiring diagrams here:

• GM 4.2L Index of Articles.

Here's a list of articles you'll find there:

• Blown Head Gasket Tests (2002-2004 4.2L Oldsmobile Bravada, 2004-2007 4.2L Buick Rainier).
• Electronic Throttle Body Tests (2002-2004 4.2L Oldsmobile Bravada, 2004-2007 4.2L Buick Rainier).
• How To Test Engine Compression (2002-2004 4.2L Oldsmobile Bravada, 2004-2007 4.2L Buick Rainier).
• TAC System Wiring Diagram (2002-2004 4.2L Oldsmobile Bravada, 2004-2005 4.2L Buick Rainier).