Questions About Testing TPS
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Laughing Gas
Joined: Apr 2011
Posts: 1,002
Likes: 7
From: London, KY
Questions About Testing TPS
I read the thread about how to test/adjust the TPS (FIPL) sensor and decided to test mine since there's not much else I can do until my injectors come in tomorrow.
It said that wire A (orange/white) is the reference wire and should have 5 volts. Wire B (black/white) is the ground path from the sensor to the trans computer and I would assume it should have 0 volts. Wire C (center wire) is the throttle opening signal sent to the computer from the sensor. It says this wire should have 1.2 volts with the throttle at idle and 4.5 with it wide open.
Well I don't have any wires that color on mine. I have a gray with orange stripe (top wire), gray with yellow stripe (center wire), and brown with white stripe (bottom wire). I tested with key on, engine off, throttle at idle. The brown and white wire (bottom wire) has 6 volts, The gray/yellow wire (center wire) has 1 volt, and the gray/orange wire (top wire) has 0 volts! What the crap?? The pics below shot the wire colors and how they line up when plugged into the sensor. My truck is a 94 7.3 IDI turbo.
It said that wire A (orange/white) is the reference wire and should have 5 volts. Wire B (black/white) is the ground path from the sensor to the trans computer and I would assume it should have 0 volts. Wire C (center wire) is the throttle opening signal sent to the computer from the sensor. It says this wire should have 1.2 volts with the throttle at idle and 4.5 with it wide open.
Well I don't have any wires that color on mine. I have a gray with orange stripe (top wire), gray with yellow stripe (center wire), and brown with white stripe (bottom wire). I tested with key on, engine off, throttle at idle. The brown and white wire (bottom wire) has 6 volts, The gray/yellow wire (center wire) has 1 volt, and the gray/orange wire (top wire) has 0 volts! What the crap?? The pics below shot the wire colors and how they line up when plugged into the sensor. My truck is a 94 7.3 IDI turbo.
Lead Driver
Joined: Nov 2003
Posts: 6,900
Likes: 3
From: Campbell River, B.C.
Thats your 5V reference line. It should read the same regardless of throttle position.
This is your variable signal line. This one will read roughly 1V at idle, and no higher than 4.5V at WOT. Hook up your meter with the key on and engine off, then work the pump lever slowly to observe a nice smooth transition from the 0.8~1.2V idle up to whatever your WOT reading is. Generally it can be 3.5~4.5. Not all trucks react the same way to the same setting, but in general 1V idle and 4V WOT is a good starting point.
That's the sensor ground!
This is your variable signal line. This one will read roughly 1V at idle, and no higher than 4.5V at WOT. Hook up your meter with the key on and engine off, then work the pump lever slowly to observe a nice smooth transition from the 0.8~1.2V idle up to whatever your WOT reading is. Generally it can be 3.5~4.5. Not all trucks react the same way to the same setting, but in general 1V idle and 4V WOT is a good starting point.
That's the sensor ground!
Lead Driver
Joined: Nov 2003
Posts: 6,900
Likes: 3
From: Campbell River, B.C.
Unless the transmission is doing something strange with the current settings, I would leave it alone. However, you still know something about your truck that you didn't before today. Nothing wrong with a little pre emptive testing.
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Laughing Gas
Joined: Apr 2011
Posts: 1,002
Likes: 7
From: London, KY
Well the transmission is shifting to early and not gearing down soon enough but I think it may be because my fuel injectors are so bad and its not getting enough go juice. I'll be changing them out this weekend and we'll see what happens from there.
Fleet Owner
Joined: Jul 2006
Posts: 20,399
Likes: 870
From: Mi'kma'ki
it was probably due to having a heavy dump bed put on,that made her want to shift early.but since i drive so easy for economy anyway,there was just no need to make her find 3rd on every little ant hill lol.
you'll find while test driving,you may only get it close to your liking.so remember the torx tool and meter on your next real trip somewhere.you may find,you'll want to make another minor change or two.
go ahead.set it right up how you like it.just stay within specs.
would be kinda cool to retrofit in your rheostat for the adjust,so you can adjust it in the cab while driving.you could setup your dial with a couple markings; fuel economy (earlier shifts,holds OD latter) /normal (how one adjusts it for a all purpose use,like we must now) /tow mode (later shifts,sooner downshifts.)
maybe an easy mod.where's LCAM.
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Lead Driver
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Lead Driver
Joined: Nov 2003
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From: Campbell River, B.C.
. I haven't lost a belt since switching to the E4OD however (lower cruise RPMs, maybe).
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