90 Reinx TPS Question. aw4 automatic 4.0
#1
CF Veteran
Thread Starter
Join Date: Aug 2011
Location: Nor-Cal Coast
Posts: 10,489
Likes: 0
Received 17 Likes
on
17 Posts
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
90 Reinx TPS Question. aw4 automatic 4.0
Hi all. My flat engine side connector on the TPS tests, adjusts fine. Less then an ohm from the middle ground "B" terminal to ground. I got 4.89V from the ECU feed to A. Adjusted it to 17% of that out C. . ,.83V, throttle closed, back-probing with paper clips, that I sanded a little. (to not tear things shoving them in along side the wire)
So checking the square trans side, I find NO ground. Furthermore, "C" just stays at .6V when I move the throttle. Also no continuity between the two "B's). So I'll dig in to the diagrams now, was wondering if someone could shed some light on this. Shouldent B be grounded on the harness side of the trans side of the TPS?
So checking the square trans side, I find NO ground. Furthermore, "C" just stays at .6V when I move the throttle. Also no continuity between the two "B's). So I'll dig in to the diagrams now, was wondering if someone could shed some light on this. Shouldent B be grounded on the harness side of the trans side of the TPS?
#2
CF Veteran
Thread Starter
Join Date: Aug 2011
Location: Nor-Cal Coast
Posts: 10,489
Likes: 0
Received 17 Likes
on
17 Posts
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
I See now Cruiser answered my question in my injector swap thread, "Grounds to the TCU" . I'll figure my lack of continuity from the B terminal of the harness side of the trans side of the TPS plug, is an issue with my wireing or the TCU it's self.
Side note. I've picked up, (guessed), that all the sensors ground throught the (ECU, PCM, TCU), to protect them from getten juiced from the ground side. (Like for instance someone putten the jumpers on backwards in the dark).
So...dead thread I suppose, unless anyone has any gems of wisdom...
Side note. I've picked up, (guessed), that all the sensors ground throught the (ECU, PCM, TCU), to protect them from getten juiced from the ground side. (Like for instance someone putten the jumpers on backwards in the dark).
So...dead thread I suppose, unless anyone has any gems of wisdom...
#3
::CF Moderator::
Join Date: Aug 2011
Location: Prescott, Az
Posts: 43,863
Received 1,524 Likes
on
1,236 Posts
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Clean your engine dipstick tube stud and all connectors.
Re-test.
Still no ground after that? Wiggle the harness in the engine bay while testing fro ground.
Re-test.
Still no ground after that? Wiggle the harness in the engine bay while testing fro ground.
#4
CF Veteran
Thread Starter
Join Date: Aug 2011
Location: Nor-Cal Coast
Posts: 10,489
Likes: 0
Received 17 Likes
on
17 Posts
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
Yea, I done did that right off. Somethensfunky. I did find it's a black wire that turns to tan-orange before it goes to D2 on the TCU.
#5
::CF Moderator::
Join Date: Aug 2011
Location: Prescott, Az
Posts: 43,863
Received 1,524 Likes
on
1,236 Posts
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Check for continuity from the TPS ground wire to the dipstick stud.
#6
CF Veteran
Thread Starter
Join Date: Aug 2011
Location: Nor-Cal Coast
Posts: 10,489
Likes: 0
Received 17 Likes
on
17 Posts
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
Crimeney Pete, on the one hand THANKS!, on the other hand get on the page!
Like I posted, it's fine from the engine side, no ground from B on the trans side. I have the panel off right now looking for D3 on the TCU, I came in for my bigger magnifier to see #'s on the plug. Tried contact cleaner.
Stud was cleaned. I see the TCU has two grounds in the diagram. Suspicious of a bad diode in the TCU? Working.....
Like I posted, it's fine from the engine side, no ground from B on the trans side. I have the panel off right now looking for D3 on the TCU, I came in for my bigger magnifier to see #'s on the plug. Tried contact cleaner.
Stud was cleaned. I see the TCU has two grounds in the diagram. Suspicious of a bad diode in the TCU? Working.....
Last edited by DFlintstone; 03-02-2013 at 11:00 PM.
#7
::CF Moderator::
Join Date: Aug 2011
Location: Prescott, Az
Posts: 43,863
Received 1,524 Likes
on
1,236 Posts
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Where's the other ground?
Shift point logic ground is C5. TCU ground is D7 They end up at g104--dipstick.
So you're trying to determine if D3 has ground in the TCU?.
Shift point logic ground is C5. TCU ground is D7 They end up at g104--dipstick.
So you're trying to determine if D3 has ground in the TCU?.
Last edited by cruiser54; 03-02-2013 at 07:35 PM.
Trending Topics
#8
CF Veteran
Thread Starter
Join Date: Aug 2011
Location: Nor-Cal Coast
Posts: 10,489
Likes: 0
Received 17 Likes
on
17 Posts
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
Not exactly. My diagram shows d3 is the black B ground on the trans side of the tps plug. I have a long wire routed around (on the driveway) to check continuity between the plug and D3 on the TCU plug.
#9
::CF Moderator::
Join Date: Aug 2011
Location: Prescott, Az
Posts: 43,863
Received 1,524 Likes
on
1,236 Posts
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
That is correct. Does D3 at teh TCU have continuity to ground when back probed?
#10
CF Veteran
Thread Starter
Join Date: Aug 2011
Location: Nor-Cal Coast
Posts: 10,489
Likes: 0
Received 17 Likes
on
17 Posts
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
On my first, (not triple checked), continuity test, I get nothing to a tan.orange wire 3 pins out form the end of the TCU connector. (I ran an old speaker wire around from the engine, through the open door to the TCU plug)
#11
::CF Moderator::
Join Date: Aug 2011
Location: Prescott, Az
Posts: 43,863
Received 1,524 Likes
on
1,236 Posts
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Tan/org is d3. Backprobe it while connected to the TCU and see if you have continuity to ground.
Did you know you spelled renix wrong in your thread title?
I have that exact same calculator as you in my Jeep, too!!
Did you know you spelled renix wrong in your thread title?
I have that exact same calculator as you in my Jeep, too!!
#12
CF Veteran
Thread Starter
Join Date: Aug 2011
Location: Nor-Cal Coast
Posts: 10,489
Likes: 0
Received 17 Likes
on
17 Posts
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
OK now just tell me exactly where that's "open" and I'll send you some seria.
Gettn dark and starten to rain. gonna "flintstone" it, with that wire through the mouse hole.
Gettn dark and starten to rain. gonna "flintstone" it, with that wire through the mouse hole.
Last edited by DFlintstone; 03-02-2013 at 08:03 PM.
#13
::CF Moderator::
Join Date: Aug 2011
Location: Prescott, Az
Posts: 43,863
Received 1,524 Likes
on
1,236 Posts
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
#15
::CF Moderator::
Join Date: Aug 2011
Location: Prescott, Az
Posts: 43,863
Received 1,524 Likes
on
1,236 Posts
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
So, no continuity from B to D3?
D3 have continuity to ground with harness plugged in and backprobing it?
90, so no C101. Maybe you should just ground B and check your TPS again.
D3 have continuity to ground with harness plugged in and backprobing it?
90, so no C101. Maybe you should just ground B and check your TPS again.