APP Sensor Tests (2004-2006 2.8L Chevrolet Colorado, GMC Canyon)

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

In this test section, you'll test the resistance across terminals 1 and 5 while depressing and then releasing the accelerator pedal.

If all is OK, you should see:

• The resistance increases as you depress the accelerator pedal.
• The resistance decreases as you 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 1.

4. 4

   Connect the other multimeter test lead to terminal 5.

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 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 decreased/increased without any gaps. 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 increase. This lets you know that APP sensor 2 is bad.

Replace the accelerator pedal assembly.

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

Replace the accelerator pedal assembly.

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

Replace the accelerator pedal assembly.

More 2.8L Chevrolet Colorado (GMC Canyon) Tutorials

You can find a complete list of 2.8L Chevrolet Colorado (GMC Canyon) tutorials and wiring diagrams here:

• GM 2.8L Vortec 4-Cylinder Index of Articles.

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

• How To Test The Electronic Throttle Body (2004-2006 2.8L Chevrolet Colorado, GMC Canyon).
• How To Test Engine Compression (2004-2006 2.8L Chevrolet Colorado, GMC Canyon).
• Blown Head Gasket Tests (2004-2006 2.8L Chevrolet Colorado, GMC Canyon).
• TAC Throttle Body Wiring Diagram (2004-2006 2.8L Chevrolet Colorado, GMC Canyon).