TEST 2: APP Sensor 1 Resistance Tests (2 Of 2)
In this test section, you're gonna' test the resistance between terminal E and terminal F as you depress and release the accelerator pedal.
If APP sensor 1 is working correctly (not defective), you should see the resistance value decrease as you depress the pedal and increase as you release the pedal.
If APP sensor 1 is defective, the resistance reading will stay stuck in one value or will have gaps as you depress/release the accelerator pedal.
NOTE: The easiest way to connect your multimeter's test leads to the male terminals of APP sensor 1 is with jumper wires with alligator clips on both ends.
These are the test steps:
- 1
Disconnect the APP sensor assembly from its electrical connector.
- 2
Place your multimeter in Ohms mode.
- 3
Connect one multimeter test lead to terminal E and the other test lead to terminal F.
At this point I generally see a resistance reading of about 2.4 K Ohms from a good APP sensor 1. - 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 1.5 K Ohms from a good APP sensor 1. - 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.
The next step is to test APP sensor 2. Go to: TEST 3: APP Sensor 2 Resistance Tests (1 Of 2).
CASE 2: The resistance DID NOT decrease/increase as you depressed/released the accelerator pedal. This test result lets you know that APP sensor 1 is defective.
Since APP sensor 1 is part of the accelerator pedal assembly, you'll need to replace the 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 1 is defective.
Since APP sensor 1 is part of the accelerator pedal assembly, you'll need to replace the accelerator pedal.
TEST 3: APP Sensor 2 Resistance Tests (1 Of 2)
If you have reached this point, you've made sure that APP sensor 1 is working correctly. Now we're gonna' resistance test APP sensor 2.
For your first APP sensor 2 test, you're gonna' test the resistance between terminal A and terminal C.
Terminal A is the terminal that receives Ground from your 2.2L Chevy Cobalt or 2.2L Pontiac G5's fuel injection computer.
Terminal C is the terminal that receives 5 Volts from your Chevy Cobalt or Pontiac G5's fuel injection computer.
The purpose of this test is to make sure that neither an open-circuit or a short-circuit problem exists between these two terminals.
If there's a short-circuit problem between these two terminals, you'll see an Ohms reading of less than 1 Ohm on your multimeter.
If there's an open-circuit problem, you'll see an OL (over limit) reading on your digital multimeter between these two terminals.
These are the test steps:
- 1
Disconnect the APP sensor assembly from its electrical connector.
- 2
Place your multimeter in Ohms mode.
- 3
Connect one multimeter test lead to terminal A.
- 4
Connect the other test lead to terminal C.
- 5
Your multimeter should read continuity.
I have usually gotten an Ohms reading of about 2.1 K Ohms at this point when testing a good APP sensor 2.
Let's examine your test results:
CASE 1: The multimeter registered continuity between terminals A and C. This is the correct test result.
Your next step is to test the resistance of APP sensor 2 while depressing/releasing the accelerator pedal. For this test go to: TEST 4: APP Sensor 2 Resistance Tests (2 Of 2).
CASE 2: The multimeter DID NOT register continuity between terminals A and C. This test result lets you know that APP sensor 2 is defective. Replace the accelerator pedal.
