APP Sensor Tests (2005-2010 2.2L Chevrolet Cobalt And Pontiac G5)

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

So far APP sensor 2 has passed its first test (TEST 3). You're now gonna' test its resistance while depressing/releasing the accelerator pedal.

What you're looking for is for the resistance value between terminal B and terminal C to decrease/increase smoothly and without gaps as you depress/release the accelerator pedal.

If APP sensor 2 is defective, you'll either see a resistance reading that stays stuck in one value or a resistance reading that has gaps as you slowly depress/release the accelerator pedal.

NOTE: The easiest way to connect your multimeter's test leads to the male terminals of APP sensor 2 is with jumper wires with alligator clips on both ends.

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 and the other test lead to terminal C.
   
   At this point I generally see a resistance reading of about 3.2 K Ohms from a good APP sensor 2.

4. 4

   Slowly depress the pedal by hand till it bottoms out.
   
   The resistance value should decrease
   
   With the pedal fully depressed I generally see a resistance reading of about 2.9 K Ohms from a good APP sensor 2.

5. 5

   Slowly release the accelerator pedal.
   
   The resistance value should increase back to the original value you saw in step 3.

Let's examine your test results:

CASE 1: The resistance decreased/increased smoothly and without gaps as you depressed/released the accelerator pedal. This is the correct test result and lets you know that APP sensor 2 is working correctly.

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

CASE 2: The resistance DID NOT decrease/increase as you depressed/released the accelerator pedal. This test result lets you know that APP sensor 2 is defective.

Since APP sensor 2 is part of the accelerator pedal assembly, you'll need to replace the entire accelerator pedal.

CASE 3: The resistance decreased/increased BUT there were gaps in the reading as you depressed/released the accelerator pedal. This test result lets you know that APP sensor 2 is defective.

Since APP sensor 2 is part of the accelerator pedal assembly, you'll need to replace the entire accelerator pedal.