Simple and free. Gotta love it. I'm gonna steal your photo BTW.

 

Haha ya I really needed that simple fix and no problem here is another one, this is how it sits now.

About my tps : Testing the square 4 wire connector at A-D I got 4.65v, B-D 4.31v. 83% of 4.65v is 3.85 not 4.31 so what's going on here? Does this difference just represent wear on the ribbon you talked about?

 

More than likely. The "engine" side is more critical. Test the flat 3 wire connector and post up your findings.

 

So I retested the flat three wire connector (ohm test), got 1.8 at 200 (not autoranging), before adjusting the tcc switch it was 0.7 at 200. Am I doin something wrong this time around or could these new numbers actually be correct. TC locks up now so I don't see how my TPS could be testing worse than before. The is no change to very little (.1) when I wiggle the harness

Also retested the square trans connector A-B=4.65v B-D=4.33v. (similar to what is was before adjusting tcc switch).


edit: Was reading cruiser's post on testing tps, will test flat 3wire again tmrw, the correct way.

 

Volts, not ohms. Key on, backprobing the connector.

 

4.82v for A-B: 0.5v3 for B-C. ???? output is off. How would changing the tps or adjusting it affect how the transmission works? It seems to do fine now that I adjusted the tcc switch. It seems like a completely different trans now

 

What you need to understand is that the TPS has two completely independent "ribbons" inside. One for the engine and one for the trans. One can be bad and the other good. Hence 2 tests have to be performed. A test on each one since they work opposite of each other.

Try adjusting the engine side from .53 to .81. Then check the readings on the trans side.

 

Ok I'll get to the adjusting on saturday. Have a buddy coming out to help work on the jeep, something I could show him (trying to get him to buy an xj, lol trying to get 3 or 4 friends to buy xj's)
(I ordered from NAPA). the tps I ordered 2 1/2 weeks ago is finally in so I'll be picking that up tmrw. I'm going to be requesting a 20% dicount (and then gonna use my caa for another 10%), is this reasonable? Order was somehow not entered/placed the first time, 2nd time the parts were in and they were sold off the don't sell cart. 3rd time I was told a rush order would be placed only to find out 3 days later rush order not placed.

 

Even better. Install the new tPS and adjust it on the engine side. Double check it on the trans side.

 

Just to clarify something here, isnt the engine side the square 4 wire connector?

Just purchased an fsm online for my 1990 and it says the optimum ratio is .930. I'm just wondering why you wanted me to adjust/install new tps when my ratio was already .930. In your explanation for adjusting tps you say to use .830, my guess is that although that ratio (.83) may be correct for some renix jeeps it is not for the 1990. Over the weekend I adjusted it as you said (no noticable difference when driving), now that I've read .930 in my fsm I'm going to go back and adjust to the factory settings. Hopefully you can clear this up!

 

Flat is engine side. Square is trans side.

There is no "set" adjustment. It is always a value based on input voltage and varies from vehicle to vehicle. I used a random example in my instructions.

RENIX TPS ADJUSTMENT
Before attempting to adjust your TPS be sure the throttle body has been recently cleaned. It's especially important that the edges of the throttle butterfly are free of any carbon build-up.
IMPORTANT NOTE: With the Key OFF, and using the positive (red) lead of your ohmmeter, probe the B terminal of the flat 3 wire connector of the TPS. The letters are embossed on the connector itself. Touch the black lead of your meter to the negative battery post. Wiggle the wiring harness where it parallels the valve cover and also over near the MAP sensor on the firewall. If you see more than 1 ohm of resistance, or fluctuation in your ohms reading, some modifications to the sensor ground harness will be necessary. The harness repair must be performed before proceeding. I can provide an instruction sheet for that if needed.
MANUAL TRANSMISSION:
RENIX manual transmission equipped XJs have only a flat three-wire TPS mounted on the throttle body and it provides data input to the ECU. It has three wires in the connector and they're clearly embossed with the letters A, B, and C. Wire "A" is positive. Wire "B" is ground. Key ON, measure voltage from "A" positive to "B" ground by back-probing the connectors. Note the voltage reading--this is your REFERENCE voltage. Key ON, back-probe the connector at wires "B" and "C". Measure the voltage. This is your OUTPUT voltage. Your OUTPUT voltage needs to be seventeen percent of your REFERENCE voltage. For example: 4.82 volts X .17=.82 volts. Loosen both T-20 Torx screws attaching the TPS to the throttle body and rotate the TPS until you
have achieved your desired output voltage. Tighten the screws carefully while watching to see that your output voltage remains where it is supposed to be. If you can't achieve the correct output voltage, replace the TPS and start over.
Sometimes, after adjusting your TPS the way outlined above, you may experience a high idle upon starting. If that happens, shut the engine off and reconnect your probes to B and C. Start the engine and while watching your meter, turn the TPS clockwise until the idle drops to normal and then rotate it back counterclockwise to your desired output voltage.
AUTOMATIC TRANSMISSION: RENIX automatic transmission equipped XJs have a TPS with two connectors. There is a flat three-wire connector, same as the manual transmission vehicles have, and it is tested the same as the manual transmission equipped vehicles, as outlined above—FOR ALL ENGINE MANAGEMENT RELATED ISSUES.
However, the automatic TPS also has a square four-wire connector, clearly embossed with the letters A,B,C, and D. It only uses three wires and provides information to the Transmission Control Module. THIS SQUARE FOUR WIRE CONNECTOR IS USED FOR TRANSMISSION/SHIFTING RELATED ISSUES ONLY. Key ON, measure voltage between "A" positive and "D" ground. Note the voltage. This is your REFERENCE voltage. Back-probe the connector at wires "B" and "D". Measure the voltage. This is your OUTPUT voltage. Your OUTPUT voltage needs to be eighty-three percent of your REFERENCE voltage. For example 4.8 volts X .83=3.98 volts. Adjust the TPS until you have achieved this percentage. If you can't, replace the TPS and start over. So, if you have an automatic equipped XJ your TPS has two sides--one side feeds the ECU, and the other side feeds the TCU.
FOR AUTOMATIC TRANSMISSION RELATED ISSUES: Check the square four-wire connector side of the TPS.
If you have ENGINE ISSUES check the flat three-wire connector side of the TPS.
For those with a MANUAL TRANSMISSION--the TPS for the manual transmission XJs is stupid expensive. You can substitute the automatic transmission TPS which is reasonably priced.
Revised 09-22-2012

 

Okay so here's the latest:
Before installing new tps: Trans-93% Engine-11%
After installing new tps: Trans-80% Engine-17% (adjusted to .81 as per cruiser54's instructions)

I believe the previous owner installed a tps and adjusted it acording to the fsm which instructs to adjust to .930 (93%) of the trans side. THIS IS A TYPO IN THE FSM.

 

Yup. How's it run?

 

Seems to be just a little crisper on the shifts. Only had it up to 60 round town, 2hr drive to my cabin on thursday will give me a good idea. (Still getting used to the automatic with lock-up). I'll fill up tmrw, so far been around 14mpg (60/40 hwy/city) would be nice to get a bit better.
I have a 900km trip next week that I need the jeep for. Besides a oil leak at the distributor gasket it seems to be ready.

 

So the TC switch on the brake pedal is open when the brake pedal isn't depressed? Or vice versa. I'm having issues with mine not locking up. I put a new switch on it and maybe I did it backwards.