TEST 2: APP Sensor 1 Resistance Tests (2 Of 2)
For your second APP sensor 1 test, you'll test the resistance of the circuit between terminals E and F while you depress and release the accelerator pedal.
If all is good with the circuit, your multimeter should report:
- The resistance decreases as you depress the accelerator pedal.
- The resistance increases as you release the accelerator pedal.
Generally, if the circuit is fried you'll see the resistance value stay stuck in one value as you depress/release the accelerator pedal.
Let's get this show on the road:
- 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.
- 4
Connect the other multimeter test lead to terminal F.
- 5
Note the Ohms reading on your multimeter.
At this point you'll see a resistance reading somewhere around 3K Ohms.
If you don't, don't worry. Continue to the next step. - 6
Slowly depress the pedal by hand till it bottoms out.
- 7
The resistance value should decrease as you depress the pedal.
- 8
Slowly release the accelerator pedal.
- 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.
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 decrease. This lets you know APP sensor 1 is bad.
Replace the accelerator pedal assembly.
CASE 3: The resistance DID NOT increase. This lets you know APP sensor 1 is bad.
Replace the accelerator pedal assembly.
CASE 4: The resistance DID NOT decrease/increase. This lets you know APP sensor 1 is bad.
Replace the accelerator pedal assembly.
TEST 3: APP Sensor 2 Resistance Tests (1 Of 2)
So far, your test results have confirmed that APP sensor 1 is OK. Now, you'll focus on APP sensor 2 by testing the circuit between male spade terminals A and C (see the illustration above).
What you're looking for is for your multimeter to report continuity in the circuit between terminals A and C.
Specifically, your multimeter should report a resistance value somewhere around 3K to 4K Ohms.
If there's a problem with the circuit, you'll usually see your multimeter report a short-circuit or an open-circuit problem.
- Terminal G receives 5 Volts DC from the PCM.
- Terminal J receives Ground from the PCM.
Let's get testing:
- 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 should see an Ohms reading somewhere between 3K to 4K Ohms.
Let's examine your test results:
CASE 1: The multimeter registered continuity between terminals A and C. So far so good, since this is the correct test result.
Your next step is testing the resistance of APP sensor 2 while depressing/releasing the accelerator pedal. 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 A and C. This test result confirms a short-circuit problem between terminals A and C.
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 A and C. This test result confirms an open-circuit problem between terminals A and C.
With this test result, you can conclude the accelerator pedal assembly is defective and needs replacement.
