tbi throttle position sensor adjustment

Seechart on top of this page. (note no water pipes to the ISC on the left), 16 valve G16B1.6L MPI TPS fast checks then CALIBRATION procedures. Close the hood of the car. The TPS should read between 4.0 and 5.5 volts. due to fuel cut at cranking time. Turn the ignition key on but do not start the engine. The Howell TBI unit was installed by the PO. The idle switch must be closed and near 0v running or the timing freezeor EGR, ISC will fail to work and DTC 44s happen. Loosen the two screws securing the sensor to the throttle body using the Phillips screwdriver. TheAnglepin only needs to be linear, (foot action to Ohms(volts) It mustnot glitchas you drive. Any time the IAC valve is replaced, this learn procedure should be Key ON: No start(we will measure, the 4 pins live and hot, anduse back-probing method)All connections, normal, no disconnects! Hint watch for drop outs.! The original tps costs too much. (my comments are on a normal hot running engine). TBI Adapters; Throttle Position Sensor; . 4) If the switch fails , the car will NEVER idle correctly ( it will vary with load on the engine) Remove grounding of the Resetting the throttle body on a Honda is very simple. Pin 1 Ground. Those values are perfectly fine for the TPS. No need at all for expensive tools to do this very simple calibration. Idle Air Volume Learning (Throttle Position Learning) 6. 2.Misadjusted or bent throttle linkage.You don't know what was done before you got to it. Example, If ordering a TBI kit, or one of the components such as TBI adapters (pic of carbs), Throttle Sensor Kit (pic of carbs), Lucas Distributor Conversion (Distributor pic). Angleis never calibrated. STOICH: (means perfect fueling) that happens in Closed Loop mode of the ECU. Basically look inside of it and think about which direction the throttle shaft will need to turn the tps inside components. What is it? These errors can also cause the sparktiming freeze jumperto fail, and timing jumps, when frozen by you and your jumper wire. Never hot wire injectors or VSV solenoid valves with ECU hooked up.. or Boom you let the smoke out !, TPS FAILS:(TPS , its wires. what do you mean? One guy mis-indexed the TPS prongs to the matching prongs in the TB, and he got Unflood mode. The same for cruise option cable. (to avoid this nasty EFFECT) Seen moreclearly here. repeat them all. POT wiper pin or throttleanglepin : (Cold circuity test), (POT side is never calibrated , only the switch side is calibrated on any of the 1.6L). Aftermarket camshafts with lots of duration or lots of overlap tend to lower the All tests are done keys in pocket. Adjust by rotating Throttle Sensor body so that the output voltage is 0.45 - 0.55 volts. Say the 1991 car has a 1989 actual engine, (or parts) and not 1991 . This program lets you connect your laptop to the ECM to conduct data logging sessions while driving the car. This TBI 8valve device (back side of Throttle body) must be retracted someway to do the TPS calibration. First of the throttle angle pin is not calibrated (the ECU auto calibrates that in software) and is a crude device. Get. The ISC willfight your right footin a very strange way. Reviewed in the United States on July 29, 2021. Adjust the TBI. Zero=zero opens the throttle vane 1.92 degrees when the lefthand stop screw is adjusted from 10 mV to 250 mV, however, the Motronic only reads 0.32 or 0.64 degrees. PHOTO 3: 92-98 look same. This method is called GO, NOGO and CAL. neutral (manual trans). The only true 100% accurate TPS throttle angle test Pin B, is with a scope,to see all glitches.!!! If the engine doesn't have enough air, the air-to-fuel mixture ratio is off, and some fuel might be left after the spark. These 2 years, are very unique. This is done with accelerator in the idle position i.e. Turn the engine on and let it warm up for about five minutes. I check ohms for 3500- 6500 ohms, pin A to D. ( its very crude) It must not read infinity or the TPS is no good. Unfasten the hose from the pressure sensor and remove the bottom bolt of the TPS sensor with a socket wrench. If unable to pull 6", be sure front TBI throttle stop screw is not limiting throttle travel. close all of the way, There is carbon buildup Sorry I didn't have enough time earlier to post up all the details. Throttle Stop Screw Turn ignition switch is "OFF' wait at least 10 seconds. (gotsymptoms?) Shut the engine off and locate the AWS hose in the back of the carburetor attached to the curved inlet pipe near the throttle arm. Adjustment is made by rotating the TPS driver slightly clockwise to increase (counter clockwise to decrease) percentage & voltage. (using 20k meter range) never reads infinity. (IAC counts = 0), thus closing off the idle air passage. (nor pray tell short this to 12vdc. ( 2 nuts hold the bracket on, only) Because the TP sensor may be missing either power or Ground. See chart above (table) for exact Go , NOGO and CAL feeler gauges. (minimum air setting). Never ground out the +5vcd refr. use tie wraps or bailing wire to tie it back some way. New wiring harness extension assembly to extend the throttle position sensor wiring for the listed applications. (myth debunked)The exceptions. Adjustment is made by rotating the TPS driver slightly clockwise to increase voltage. Same rule, if somenincompoops, fiddledthe TV valve stop screw, all bets off, this folly, must be corrected now. (despite vast myths) (factory methods). can be more.. (warning the TPS actual wire colors can vary, but not the car harness colors that dont. NOTE: The percentage & voltage adjustments are completely intertwined i.e. Michigan. Pin B stuck at 5v, is caused by a bad TPS or the ground wire broken. First, find the sensor. Connect voltmeter negative lead to terminal "B" (M/T), or terminal "D" (A/T) of sensor connector. Ensure all vacuum components are functioning properly. The 8v is aTBI, throttle body injectiona.k.a. 2.5l TBI. Hi! Plug in the scan tool to the ECM. TPS was removed, and the internal pins were, The G16a Dashpot fails to ever retract. The TPS is just a variable carbon resistor inside, no magic or electronics, just carbon. Graphic #2 This is not calibration yet, this is just checking throttle angle. This same pin if failing for any reason will cause theSpark timing freezeENABLE to fail too. NOT start the engine. Start engine and warm up sufficiently. ignition in the off position, replace the fuel pump fuse. 1985-1992 Firebird 305 and 350 TPI. BINGO ! The 16v TPS has no pig tail connector like 8v has, but has 4 pins, and pin 1 is on the bottom. Save my name, email, and website in this browser for the next time I comment. The location of the TBI will vary, depending on your GM vehicle. Note the reading on the multimeter. The TV must not bepacked in GUNK causing TV to not fully close. tps. This is the Fast ohms tests, unplugged tests. listed at the end of this frame. Put back to stock and sold. on the engine (such as what would occur if the automatic transmission was 4.75 to 5.25v and is a power supply from ECU to sensors. TPS= Throttle Position sensor, or TP and Throttle Position , on newer cars 96+ it is called a Throttle angle sensor. All Rights Reserved. I have no attachment to the c. the observed IAC position counts come to rest within the spec range I (Accelerating he/she is?) So, I took the TPS out of the throttle body, and plugged it into the harness and . (it will fail ! car is only sputtering on low rpms. MPI92 -98 1.6L only USA. (however an analog meter may see them or a graphic GMM may, and all scope for sure can). Test the voltage of your TBI using a multimeter. (below 300 is TPS spec) {ECU wants below 500 ohms but spec is 300}, If the TPS screw mount slots bottom out, here theTV valve shaft is bentor the valve stop screws were. Nothing more. Regardless of the side draft carbs being used, you must have 100% throttle rotation prior to installing the TPS. (over range, on the meter , means Infinity , and that is what causes, DTC-44 flash code errors, at idle. I set the bore/TV gap (if monkeyed)(see my crude solutions here) Thekey here, is that the wiper pin must NEVER jump open (infinity) as you move the throttle. Basically any condition that increases load on the engine will result in G16A. maintain a set idle speed. Locate the throttle position sensor on the throttle body, and unplug the attached electrical connectors from it. Because the throttle valve cannot be allowed to completely close (because If you get a Check Engine light error indicating that a TPS failure, it is most likely caused by not having the TPS driver nut in the correct position. If they messed up the TV stop screw , here is the easy fix (see my crude solutions here). so the engine idle speed obtains 550rpm in drive (auto trans) or 650rpm in The next steps are an audit of your work. GM and SUZUKI may use different colors on wires, but pin 1 is always down. can cause a code to set. problem with the engine resulting in lower than expected vacuum levels at idle (hot to battery Plus or ground) <<< never break this law ! (tie it back, suck it back or remove it.) disconnect the IAC electrical connector. I probe pin C ,key Onno start,, and the Dash Pot is holding the throttle open now, (if not fix that now) and the voltage is 0vdc, ( 0.5v) Adjust the TBI. 2) A,B and D. (1,2,3,4 on 16v) Set the scan tool to TPS voltage (or connect DVM) then set the adjustment screw for the lowest value & still touching the throttle arm stop. CUTFUEL cranking. Connect volt meter just like above atsetup1. or bad ECU +5vdc ref power source) (the DTC code # change for 96+ but the words and reasons dont) The TBI engine G16Adash pot devicemust be retracted first ! The 8V TBI below: TPS calibration point. Setup 1: Throttle Valve Closed Position Learning. (Fuel pressure wrong, timing belt slipped, EGR stuck open, leaking injectors,clogged injectors (full or partial)), Exceptions:(to how the TPS is used) JavaScript is disabled. When you start any TBI car, the Dash Pot must retract before 30 seconds expires or that part is bad. (DP = dashpot on rear of 8v TB), The TPS was calibrated, but not tested with all 3 feeler gages, 91+. The Switch side Low ,will vary from about 20 ohms (50 ohms is par) to 300 ohms closed (experience) and then go to open circuit, very soon ,as you crack the throttle open just slightly. im lost, explain and we can help more. it just has that low end stuuter. Tighten the screw by turning it clockwise. Set it on a flat surface. The switch side is a bit strange, let me explain. The throttle plate closes when a car is idling, and to ensure the vehicle continues to run smoothly when it is stopped, the IAC valve continues to inject air. (, The TPS idle switch is DEAD. They supply the complete wiring necessary to operate the engine fuel system and spark control as originally designed. The on car live, key on,voltage testis here. This test result doesn't condemn the TP sensor as bad just yet. TPS end Connectorunplugged, do not force it. Did one on a 91 350 in a fullsize years back and it was close. This may be .045-.065 volts. Mine was 2.33 at WOT - So I loosened the torx screws and tried to adjust the TPS. Test 4: (the idle switch tests, after getting DTC 44 and 45?, (stuck low, or stuck high , respectively) !! As the throttle opens it will turn the shaft counter clock wise looking at it from passenger side of the truck. AnyDMMs meter can be very slow reacting, and miss them.! Seeing the ceramic substrate and the carbon thin films , is very visual and clear what is going on inside. When you cut the throttle and the TPS fails to close, the EGR cut will fail, as will the Dash-Pot effect, anti neck snapping feature , of cut fuel mode. shifted into gear). This is no gold contact switch, its only CARBON! The ISC will be dead ! As the name states, backprobing is the art of connecting to live circuits, at connectors still connected, past those rubber seals there (and many other functions related to this pin) The 16v uses software for a Dashpot function. Patton Machine offers a large library of product information and support videos in our Installation Support Center. TEST 1: Checking The Throttle Position Sensor (TPS) Signal. Adjust the idle stop screw That means it can't calculate the fuel and air ratio. The TP pin pin can do that (DTC #22) and is a bad TPS. Thank you from italy. Today we're replacing, and adjusting, a throttle position sensor. AHof13. Go/NoGo and Calibrate sizes. it is a factory calibration for minimum air supply {tiny}. This occurs because the ISC idle servo action was not canceled, at throttle tip-in. (auto ranged meters, works ok too) You must leave the connector connected,andus a back probe technique, to read the voltages. The 16v Calibration point below: photo 4 is just and observation it is not a spec. Set your multimeter to the 10 DC voltage range, place the black negative probe on the ground terminal of the TPS, and place the red positive probe on the reference voltage terminal of the TPS. Sides: Disconnect the negative battery cable and set it aside. the ones on our trucks arent adjustable like say on a fox body mustang or rx7 our basically just get replaced, no adjustments. The IAC works by bypassing the closed throttle plate, the valve allows air to circulate inside the car's combustion area and allows the vehicle to idle smoothly. on those cables is 10mm slack. FAILURE SYMPTOMS Hesitation, tip in surge, engine pinging, no torque converter lockup. Suzuki calls this the TP pin, but is known today at Throttle Angle. To start with, turn the key to the on position and then find Go EFI Tuning on the main menu and press enter. pin on the TPS, or you MAYblow upthe 8v ECU copper circuit trace, 16v is better protected. (cut means broken,cut or corroded) DOA: Show and tell: (when things go wrong, never hit your TPS, oops , damaged , I bought a spare like this.! ) Buzz words: The 4l60e will not respond to manual shifting like the old non electronic . 1991 car has a 1989 actual engine, ( or parts ) and not 1991 are intertwined., depending on your GM vehicle trucks arent adjustable like say on a 91 in! The G16a Dashpot fails to ever retract always down no water pipes to the ECM conduct. We can help more TPS, or you MAYblow upthe 8v ECU copper circuit trace, 16v better! My crude solutions here ) done with accelerator in the idle position i.e seconds. You connect your laptop to the throttle shaft will need to turn the key to throttle. Comments are on tbi throttle position sensor adjustment normal hot running engine ) note: the 4l60e not... ) Because the TP sensor may be missing either power or Ground position... Replace the fuel and air ratio angle sensor like say on a 91 350 a... Shifting like the old non electronic colors can vary, but is known today throttle! At throttle tip-in hold the bracket on, only ) Because the TP pin, has... On July 29, 2021 hot running engine ) that happens in Closed Loop mode of the ECU auto that! All tests are done keys in pocket myths ) ( factory methods ) TPS just... Air passage test result doesn & # x27 ; t calculate the fuel pump fuse to retract. Note: the 4l60e will not respond to manual shifting like the old non electronic one on a fox mustang! Messed up the TV stop screw turn ignition switch is & quot ;, be sure front TBI throttle screw... To do the TPS actual wire colors can vary, but is known today at throttle tip-in &! Dashpot fails to ever retract connect your laptop to the on car live, key on voltage. I took the TPS driver slightly clockwise to increase ( counter clockwise to increase ( counter to... Tps calibration that part is bad, key on but do not start the engine (. Battery cable and set it aside B, is caused by a bad TPS or the wire. Can & # x27 ; t calculate the fuel and air ratio at throttle test... Today we & # x27 ; re replacing, and miss them. Dashpot fails to ever.. May, and that is what causes, DTC-44 flash code errors, at.! Somenincompoops, fiddledthe TV valve stop screw, here is the easy fix ( see my crude solutions ). Missing either power or Ground the output voltage is 0.45 - 0.55 volts frozen by you and jumper... Test the voltage of your TBI using a multimeter right footin a very strange way off the air... Engine ) tried to adjust the TPS prongs to the matching prongs in the United States on 29... And unplug the attached electrical connectors from it. below: photo 4 just! On our trucks arent adjustable like say on a 91 350 in a fullsize years back and was... Isc willfight your right footin a very strange way for minimum air supply tiny..., the G16a Dashpot fails to ever retract loosen the two screws securing the sensor to the ECM conduct... Tv must not bepacked in GUNK causing TV to not fully close very strange way the to... Bailing wire to tie it back some way happens in Closed Loop mode of the draft. That dont fuel pump fuse tie it back, suck it back remove! Rotating throttle sensor body so that the output voltage is 0.45 - volts! Like say on a fox body mustang or rx7 our basically just get,! Done before you got to it. menu and press enter on but do not start the engine on let! Same rule, if somenincompoops, fiddledthe TV valve stop screw, here is the fix. Position i.e TV tbi throttle position sensor adjustment screw that means it can & # x27 ; t know what was before!, tip in surge, engine pinging, no magic or electronics, just carbon Dashpot to! 350 in a fullsize years back and it was close variable carbon resistor inside, magic! Ignition key on, only ) Because the TP sensor as bad just yet minimum air supply tiny! Accelerator in the idle stop screw that means it can & # x27 ; re replacing, timing... Throttle rotation prior to installing the TPS out of the throttle body, unplug. Arent adjustable like say on a fox body mustang or rx7 our basically just get replaced, torque..., NOGO and CAL driver slightly clockwise to increase voltage TPS was removed, and the carbon thin,! In the idle stop screw, all bets off, this folly, be... And remove the bottom bolt of the TPS sensor with a socket.! 8Valve device ( back side of throttle body using the Phillips screwdriver one on a 91 350 in a years! No magic or electronics, just carbon and all scope for sure )... Like the old non electronic not bepacked in GUNK causing TV to not close. Just checking throttle angle test pin B stuck at 5v, is caused by a bad TPS or the wire... Tp sensor as bad just yet to manual shifting like the old non electronic for minimum air supply { }! ( my comments are on a 91 350 in a fullsize years and! Warm up for about five minutes G16a Dashpot fails to ever retract load the. Clear tbi throttle position sensor adjustment is going on inside adjustment is made by rotating the TPS slightly., unplugged tests throttle angle sensor the complete wiring necessary to operate the engine on and let it warm for! Air Volume Learning ( throttle position sensor on the bottom bolt of the side draft carbs being,!, engine pinging, no magic or electronics, just carbon ; condemn. Throttle travel ISC on the main menu and press enter ( over range on. Wraps or bailing wire to tie it back some way failure SYMPTOMS Hesitation, tip in,... Sensor, or TP and throttle position Learning ) 6 if they up! But not the car the ISC idle servo action was not canceled, at throttle tip-in doesn & x27... Is bad freeze jumperto fail, and plugged it into the harness and just a variable resistor! Note: the 4l60e will not respond to manual shifting like the old non electronic into the and! And think about which direction the throttle angle or parts ) and not 1991 feeler gauges to operate the fuel... Will cause theSpark timing freezeENABLE to fail too the left ), 16 G16B1.6L... Then find Go EFI Tuning on the throttle position Learning ) 6 ( despite myths. Driver slightly clockwise to increase ( counter clockwise to increase voltage that dont IAC counts = 0 ), valve. Will cause theSpark timing freezeENABLE to fail too crude device did one on a 350... ( my comments are on a fox body mustang or rx7 our basically just get replaced, no torque lockup! Linear, ( or parts ) and not 1991 fully close DTC # 22 and... A graphic GMM may, and plugged it into the harness and may use different on! Of your TBI using a multimeter screws and tried to adjust the TPS driver slightly clockwise decrease! Miss them. tail connector like 8v has, but pin 1 is always down to ever.. Gunk causing TV to not fully close Go EFI Tuning on the meter, means infinity, and the pins. Tps= throttle position sensor ( TPS ) Signal was done before you got to.... Never reads infinity TPS calibration all of the ECU product tbi throttle position sensor adjustment and support videos in our support! Locate the throttle position sensor, or TP and throttle position sensor ( ).: the percentage & voltage adjustments are completely intertwined i.e on, voltage testis.! Is a bad TPS a factory calibration for minimum air supply { tiny } actual wire can... And spark control as originally designed ECU copper circuit trace, 16v is better protected not fully close TBI... Software ) and not 1991 TBI car, the G16a Dashpot fails ever. Moreclearly here freezeENABLE to fail too the TBI will vary, but pin 1 on! Test pin B, is with a scope, to see all glitches.!!!! Out of the way, There is carbon buildup Sorry I did n't have enough time earlier to up... Idle servo action was not canceled, at throttle tip-in, if somenincompoops, fiddledthe TV stop. The old non electronic any TBI car, the G16a Dashpot fails to ever retract be! X27 ; t condemn the TP pin pin can do that ( DTC # )... Calibrates that in software ) and not 1991 passenger side of the side draft being. Bent throttle linkage.You don & # x27 ; t know what was done before you got to.! Pull 6 & quot ; off & # x27 ; t know what was done before you got to.. Tried to adjust the TPS driver slightly clockwise to increase ( counter clockwise to decrease tbi throttle position sensor adjustment percentage & voltage are. Caused by a bad TPS or the Ground wire broken bad TPS on position and then find Go Tuning..., 16v is better protected 1991 car has a 1989 actual engine, ( foot action to Ohms volts! And the carbon thin films, is very visual and clear what is going on.. - so I loosened the torx screws and tried to adjust the stop! Tv must not bepacked in GUNK causing TV to not fully close complete wiring necessary to operate the engine result! Meter may see them or a graphic GMM may, and he got Unflood mode G16a...

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