TEST 2: APP Sensor 1 Resistance Tests (2 Of 2)
Now that you've checked the circuit between terminals D and K, you'll check the resistance between terminal D and E as you depress and release the accelerator pedal.
Your multimeter should report the following (if all is good):
- The resistance increases as you depress the accelerator pedal.
- The resistance decreases as you release the accelerator pedal.
OK, let's get going:
- 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 D.
- 4
Connect the other multimeter test lead to terminal E.
- 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
Slowly depress the pedal by hand till it bottoms out.
- 7
The resistance value should increase as you depress the pedal.
- 8
Slowly release the accelerator pedal.
- 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. This is the correct test result.
The next step is testing APP sensor 2. Go to: TEST 3: APP Sensor 2 Resistance Tests (1 Of 2).
CASE 2: The resistance DID NOT increase. This lets you know APP sensor 1 is bad.
Replace the accelerator pedal assembly.
CASE 3: The resistance DID NOT decrease. This lets you know APP sensor 1 is bad.
Replace the accelerator pedal assembly.
CASE 4: The resistance DID NOT increase/decrease. This lets you know APP sensor 1 is bad.
Replace the accelerator pedal assembly.
TEST 3: APP Sensor 2 Resistance Tests (1 Of 2)
Now that you've confirmed that APP sensor 1 circuits are OK, we'll focus our attention on APP sensor 2.
To start your APP sensor 2 diagnostic, you'll check for continuity between terminals G and J (of APP sensor 2).
Here are the terminal details:
- Terminal G receives 5 Volts DC from the PCM.
- Terminal J receives Ground from the PCM.
The focus of this test section is making sure the circuit between terminals G and J hasn't suffered an open-circuit or a short-circuit problem.
Let's get started:
- 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 G.
- 4
Connect the other test lead to terminal J.
- 5
Your multimeter should read continuity.
You'll usually see an Ohms reading somewhere between 3K to 4K Ohms.
Let's examine your test results:
CASE 1: The multimeter registered continuity between terminals G and J. This is the correct test result.
Your next step is testing 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 registered 0 Ohms (or a value very close to it) between terminals G and J. This test result confirms a short-circuit problem between terminals G and J.
With this test result, you can conclude the accelerator pedal assembly is defective and needs replacement.
CASE 3: The multimeter reports no continuity (the letters OL are displayed) between terminals G and J. This test result confirms an open-circuit problem between terminals G and J.
With this test result, you can conclude the accelerator pedal assembly is defective and needs replacement.
