TEST 2: TPS 1 Resistance Test (Part 2 Of 2)
In this test section, you'll test the resistance across terminals A and G while opening and then closing the throttle plate.
If all is OK, you should see:
- The resistance increase as you open the throttle plate to its wide-open position.
- The resistance decrease as you close the throttle plate from its wide-open position to its closed position.
These are the test steps:
- 1
Disconnect the throttle body from its electrical connector.
- 2
Place your multimeter in Ohms mode.
- 3
Connect one multimeter test lead to terminal A.
NOTE: You'll make all multimeter connections on the male spade terminals of the electronic throttle body itself. - 4
Connect the other multimeter test lead to terminal G.
At this point, you'll see a reading somewhere between 2K to 4K Ohms. - 5
Slowly open the throttle plate by hand till it reaches its wide-open throttle (WOT) position.
- 6
The resistance value should increase as you open the throttle plate.
- 7
Slowly close the throttle plate to its fully closed position.
- 8
The resistance value should decrease as you close the throttle plate.
Let's examine your test results:
CASE 1: The resistance increased/decreased without any gaps. This is the correct test result.
Your next step is to test the TPS 2 circuit. Go to: TEST 3: TPS 2 Resistance Test (Part 1 Of 2).
CASE 2: The resistance DID NOT increase. This lets you know that TPS 1 is bad.
Replace the electronic throttle body.
CASE 3: The resistance DID NOT decrease. This lets you know that TPS 1 is bad.
Replace the electronic throttle body.
CASE 4: The resistance DID NOT increase/decrease. This lets you know that TPS 1 is bad.
Replace the electronic throttle body.
TEST 3: TPS 2 Resistance Test (Part 1 Of 2)
Now that you've tested and confirmed that the TPS 1 circuits are OK, it's time to perform the first of the two TPS 2 tests.
Specifically, you'll test across terminals B and H to check for an open-circuit or a short-circuit problem. If you find no problems, your next step will be TEST 4.
NOTE: You'll make all multimeter connections on the male spade terminals of the electronic throttle body itself.
These are the test steps:
- 1
Disconnect the throttle body from its electrical connector.
- 2
Place your multimeter in Ohms mode.
- 3
Connect the red multimeter test lead to terminal B.
- 4
Connect the black multimeter test lead to terminal H.
- 5
Your multimeter should read continuity.
To be a bit more specific, you should see a value somewhere between 2K to 4K Ohms.
Let's examine your test results:
CASE 1: The multimeter registered continuity between terminals B and H (a value somewhere between 2K to 4K Ohms). This is the correct test result.
Your next step is to go to: TEST 4: TPS 2 Resistance Test (Part 2 Of 2).
CASE 2: The multimeter registered 0 Ohms (or a value very close to it). This test result indicates that the circuit between terminals B and H has a short-circuit problem.
With this test result you can conclude that the electronic throttle body is defective and needs replacement.
CASE 3: The multimeter reports no continuity (the letters OL are displayed). This test result indicates that the circuit between terminals B and H has an open-circuit problem.
With this test result you can conclude that the electronic throttle body is defective and needs replacement.
