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Jeep Wrangler YJ
YJ General Discussion
TPS setting
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<blockquote data-quote="deadpool1" data-source="post: 439694" data-attributes="member: 21229"><p>that seems very good , the engine. (VAC steady)</p><p>so just a bad dimmer switch, that all? super easy fix that. (and sold he parts)</p><p>IAT is there, on top of intake man, back then ,called MAT, manifold air temp, new name is IAT... parts book OEM shows it is there, and not optional.</p><p></p><p> calif PCM has no up-shift featurre, or wrong PCM put into car. The tranny switch 4/5, named is not there in calif car. so if tranny from calif put in to FED car it is missing or plugged.</p><p>the hood sticker is what matters, its it lost? all USA cars have it, and with California in the text ,. that word means ,<strong> CALIF CARB certified</strong> car with all calif, smog related parts that means PCM tool.</p><p>most every old car like this, has wrong parts on it, and expected. , or missing, The are all discovered 1 by 1.</p><p>the top sensors can be tested with a volt meter DMM, no need to throw parts at this car, like (ECT/CTS) chapter 14 page 45, shows OHMS chart. for temperatature. about <strong><em>200</em></strong>ohms hot. ECT, and same chart for IAT,(MAT), just not as hot. say <strong>1500 ohms hot </strong>engine.?same page photo of mat</p><p>then the MAP sensor,same page. and the next p46, it tells the voltages output PIN B.</p><p>the page calls MAT a switch ,it is NOT switch both sensors are just a simple Thermistor. (thermal resistor) ECT and IAT are thermistors.</p><p></p><p>Key on not running = 4 to 5vdc, </p><p>idle , voltage, map = 1.5 to 2.1vdc. and varies with throttle action (vacuum is with it measures, ) </p><p>Pin C map is named 5v. but is really 4.5 to 5.5vdc, and never changes unliss new PCM is installed, this is power supply pin, out of PCM to this sensor.</p><p>Pin A map is special ground, 0vdc.</p><p>I posted the free FSM off the sticky post, here, <a href="https://wrangleryjforum.com/threads/jeep-wrangler-yj-factory-service-manuals-fsm-and-part-catalogs.27000/" target="_blank"><strong>see that yet?.</strong></a></p><p></p><p>the O2 sensor from NTK or Bosch is best, on old cars. and if it shorts out the ASD drops out and engine is now dead. it has 100,000 mile design life rating.</p><p>check out the switches on page 48 and 49. (pdf page 1374) the PDF above has 2 books in one,. so do not get confused, the 2nd book inside is for EFI.</p><p>idle switch and WOT switch tested?</p><p>see the ISA waring page 49 no ISA motor death?</p><p>Chapter 14 covers all this.</p></blockquote><p></p>
[QUOTE="deadpool1, post: 439694, member: 21229"] that seems very good , the engine. (VAC steady) so just a bad dimmer switch, that all? super easy fix that. (and sold he parts) IAT is there, on top of intake man, back then ,called MAT, manifold air temp, new name is IAT... parts book OEM shows it is there, and not optional. calif PCM has no up-shift featurre, or wrong PCM put into car. The tranny switch 4/5, named is not there in calif car. so if tranny from calif put in to FED car it is missing or plugged. the hood sticker is what matters, its it lost? all USA cars have it, and with California in the text ,. that word means ,[B] CALIF CARB certified[/B] car with all calif, smog related parts that means PCM tool. most every old car like this, has wrong parts on it, and expected. , or missing, The are all discovered 1 by 1. the top sensors can be tested with a volt meter DMM, no need to throw parts at this car, like (ECT/CTS) chapter 14 page 45, shows OHMS chart. for temperatature. about [B][I]200[/I][/B]ohms hot. ECT, and same chart for IAT,(MAT), just not as hot. say [B]1500 ohms hot [/B]engine.?same page photo of mat then the MAP sensor,same page. and the next p46, it tells the voltages output PIN B. the page calls MAT a switch ,it is NOT switch both sensors are just a simple Thermistor. (thermal resistor) ECT and IAT are thermistors. Key on not running = 4 to 5vdc, idle , voltage, map = 1.5 to 2.1vdc. and varies with throttle action (vacuum is with it measures, ) Pin C map is named 5v. but is really 4.5 to 5.5vdc, and never changes unliss new PCM is installed, this is power supply pin, out of PCM to this sensor. Pin A map is special ground, 0vdc. I posted the free FSM off the sticky post, here, [URL='https://wrangleryjforum.com/threads/jeep-wrangler-yj-factory-service-manuals-fsm-and-part-catalogs.27000/'][B]see that yet?.[/B][/URL] the O2 sensor from NTK or Bosch is best, on old cars. and if it shorts out the ASD drops out and engine is now dead. it has 100,000 mile design life rating. check out the switches on page 48 and 49. (pdf page 1374) the PDF above has 2 books in one,. so do not get confused, the 2nd book inside is for EFI. idle switch and WOT switch tested? see the ISA waring page 49 no ISA motor death? Chapter 14 covers all this. [/QUOTE]
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