Discovery I Talk about the Land Rover Discovery Series I within.

Throttle Position Sensor testing

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Old Mar 10, 2014 | 09:34 AM
  #1  
crazy disco's Avatar
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1st Gear
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Default Throttle Position Sensor testing

Hi everyone,
I know this subject has been beat to death on the forum. I need to test the tps unit with a multi meter, however I am not very good with a multi meter so I need a really good tutorial on how to do this and what I am looking for in the test.
this unit has a red, green, and yellow wire. I need to know what wire to test and what setting to use on the multi meter and what my readings should be? I need the ohm sweep range and a voltage range for a sweep.
This disco has 250.000 miles on it. It is doing all the tell tale since that are mentioned in these forums that people are pulling their hair out about figuring this problem out.
sometimes it will start and idle fine for 45 minutes it will accelerate parked with no issues but under a load it craps out then won't restart , wants to but wont acts like a fuel issue.
I have installed a new fuel pump
new fuel filter on frame
changed fuel regulator
did full tune up
checked coolant sensor
checked fuel sensor
checked relays for fuel pump
I am old school on mechanicals and this electronic crap is driving me insane!
 
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Old Mar 10, 2014 | 07:12 PM
  #2  
TOM R's Avatar
Baja
Joined: Mar 2009
Posts: 5,736
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From: south n.j. and ne va.
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There are wire diagrams in rave probly TPS test also, that said believe you will get 5 volts on red? The other out side wire is ground, center wire is the reading, thinking low DC setting on meter black to ground on batt, red meter wire to center wire key to run and move throttle

Did you do sender and pump?

What year?

Codes?

Where are you idling?

Checked voltage? 14 at idle

Checked grounds are clean?

Checked crank sensor harness?

Just spitballing
 
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