APP Sensor Tests (2002-2003 4.2L Oldsmobile Bravada)

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

In this last test section, you'll check the resistance between terminal G and H as you depress and release the accelerator pedal.

Your multimeter should report the following (if all is good):

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

If there's a problem in the circuit between terminals G and H, you'll see:

• The resistance value stuck in on value as you depress/release the accelerator pedal.
• Gaps in the resistance value as you depress/release the accelerator pedal.

OK, let's get started:

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 G.

4. 4

   Connect the other multimeter test lead to terminal H.

5. 5

   Note the Ohms reading on your multimeter.
   
   At this point you'll see a resistance reading somewhere around 2k to 3K Ohms.
   
   If you don't, don't worry. Continue on to the next step.

6. 6

   Slowly depress the pedal by hand till it bottoms out.

7. 7

   The resistance value should decrease as you depress the pedal.

8. 8

   Slowly release the accelerator pedal.

9. 9

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

Let's examine your test results:

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

If the 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 decrease. This lets you know APP sensor 2 is bad.

Replace the accelerator pedal assembly.

CASE 3: The resistance DID NOT increase. This lets you know APP sensor 2 is bad.

Replace the accelerator pedal assembly.

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

Replace the accelerator pedal assembly.

More 4.2L Oldsmobile Bravada Tutorials

You can find a complete list of 4.2L Oldsmobile Bravada 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).