Steven chermak

Auto trans. 3000 rpms before it will shift out of 1st. Feels like it strugles to shift to 2nd. 2nd and third is fine. In and out of third and forth like it can't make up its mind. Any ideas. Adjust tps to .08 volts and still not acting right.

DFlintstone

When you start of in drive, is it OK, or slipping?> (check TCU fuse on the wiring under the glove box)....OR there is a TPS adjustment procedure in my sig that Cruiser wrote up for us.

Steven chermak

Starts off fine. takes forever to shift out of 1st. And its driving me crazy

kjc

Check/adjust your kickdown cable.. it's easy and can cause tranny damage if out of adjustment. As per the photos, press the release button 'in' and push the cable housing all the way back towards the adjuster.. release the button, then push the gas pedal to the floor. You'll hear the cable 'ratchet' into the correct position as it self adjusts. (engine off for this, of course) hope this simple fix solves your problem.

cruiser54

Use the procedure with the 4 wire connector, not the 3-wire one for the engine. It's like 2 separate TPSs in one.

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 a three-wire TPS mounted on the throttle body. This manual transmission vehicle TPS provides data input to the ECU. The manual transmission TPS 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. Adjust the TPS until you
have achieved this percentage. If you can't achieve the correct output voltage replace the TPS and start over.
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—FOR 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. 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 four-wire connector side of the TPS.
If you have ENGINE issues check the 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 05-28-2012

Steven chermak

Adjusting the kick down cable helped some now it shifts at 2500 rpms and. Don't seem as sluggish.

DFlintstone

I'm not SURE it's right, but I did mine with a dime.

cruiser54

You need to check the TPS on the trans side.........

Also, the ground for the TCU's "shift logic" circuit happens to be at the engine dipstick tube stud. Ever refreshed your grounds completely?

DFlintstone

Good call Kjc