Motor Vehicle Maintenance & Repair Stack Exchange is a question and answer site for mechanics and DIY enthusiast owners of cars, trucks, and motorcycles. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I recently got an OBD-II dongle with the Torque Android app, which allows me to read the computer's output in real time. The app will let me drag and drop different gauges on my screen, which works out great. However, there is a gauge for vacuum pump pressure, and I don't know why the vehicle (2008 Tundra) would have one.

So, what is the function of a vacuum pump in a modern engine, or is this just a label problem with the app?

share|improve this question
Does said gauge actually give you any readings? – hillsons Mar 4 '14 at 22:18
@hillsons Yes, it did give actual readings.. not sure of what range though. – Rubber Duck Mar 6 '14 at 0:21
up vote 5 down vote accepted

Diesel engines typically have a vacuum pump to supply power to the brake boosters. If your 2008 Tundra doesn't have a diesel engine, then that gauge is likely referring to the vacuum pressure being measured in your intake manifold.

share|improve this answer
Also turbo or supercharged engines – mikes Mar 4 '14 at 22:24

The OBD-II protocol is standard across all engine types post-1999( or thereabout). That means Torque will allow you to read all the standard outputs, even if your car doesn't happen to have that particular device. You'll just get a gauge that doesn't actually do anything.

By the way, I've had Torque for just over a year and it's fantastic.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.