comanche32 Posted February 7, 2012 Share Posted February 7, 2012 well guys I have a 90 2wd 4.0 auto comanche. I took the truck to a mechanic cause it kept dieing. the mechanic replace the tps and said it fixed the problem. but now the trans isnt wanting to shift you have to rap it out to get it to go into second gear. it wasnt doing this before he replaced the tps but he says the trans is bad and needs rebuilt. IT WAS FINE before i took it to him is there anywat the tps is doing this. any help greatky appreciated Link to comment Share on other sites More sharing options...
mnkyboy Posted February 7, 2012 Share Posted February 7, 2012 The TPS on the 4.0l/auto has two parts,one part for the engine and one for the transmission. He probably didn't adjust it right Link to comment Share on other sites More sharing options...
cruiser54 Posted February 7, 2012 Share Posted February 7, 2012 If he did at all....... Link to comment Share on other sites More sharing options...
txjeeptx Posted February 7, 2012 Share Posted February 7, 2012 . . or he installed a manual transmission tps, so now the computer for the transmission has no idea what the throttle position is. Doubt he adjusted the tps correctly, either, especially if he installed the wrong kind of tps and just left the pigtail to tps fromt he trans computer unplugged. You can verify if this is the problem yourself by checking to see if the TPS has teo wiring connections to it, or just one, with another three wire plug hanging around near it. Link to comment Share on other sites More sharing options...
comanche32 Posted February 8, 2012 Author Share Posted February 8, 2012 well than it would make perfect since why its not shifting right now. thanks you guys and how do you adjust it. Link to comment Share on other sites More sharing options...
cruiser54 Posted February 8, 2012 Share Posted February 8, 2012 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: 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. If you see more than 1 ohm of resistance 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. If you have TRANSMISSION 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 11-28-2011 Link to comment Share on other sites More sharing options...
comanche32 Posted February 9, 2012 Author Share Posted February 9, 2012 ended up the tps he put on was bad put a new tps on it and truck shifts just fine thanks agian guys Link to comment Share on other sites More sharing options...
mkbruin Posted February 9, 2012 Share Posted February 9, 2012 ended up the tps he put on was bad put a new tps on it and truck shifts just fine thanks agian guys So.... he put on a bad TPS, then tried to get you to buy a trans rebuild after his part was bad? Sounds like you need a new mechanic. Link to comment Share on other sites More sharing options...
txjeeptx Posted February 10, 2012 Share Posted February 10, 2012 Yup, he shouldn't touch yer truck again. Fired. Link to comment Share on other sites More sharing options...
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