All EFI engines like this go lean if the driver punches the throttle, all do (dead TPS), ( due to that slug of air is INSTANT) then the AIR meter sees the change late. Consult the engine diagram that came with your vehicle for extra guidance. Throttle body INJECTED with just 1 injector. End fast testing. Never hot wire injectors or VSV solenoid valves with ECU hooked up.. or Boom you let the smoke out !, TPS FAILS:(TPS , its wires. The TPS must not prevent the TVfrom closing 100%. (over range, on the meter , means Infinity , and that is what causes, DTC-44 flash code errors, at idle. Then put a load resistor 470k (yellow,Violet-yellow color code) on Pin B to ground, (resistor side one at B pin and the other resistor end to ground pin) . There are exceptions to that. Plug in the scan tool to the ECM. That would put the main line pressure to maximum. Previous owner removed it and put it back and now its not calibrated or did the calibration guessing or with wrong feeler gauges? Begin the calibration. In 1991 GM changed the throttle position sensor connector and there are two styles of EGR solenoid . (hot to battery Plus or ground) <<< never break this law ! Icle > IAC Startup > IAC Park Position Using the software - Idle ICF (tachometer icon) > IAC Parked Selection The screw is set with very tough loc-tite. Even better is a scope on pin, B , testing both forglitches, as you advance the throttle, a TPS when worn, loves to GLITCH ! Tools: (if it cant ever close) Please send photos, relevant images associated to your classic car parts order. I use tinyalligator clipsto comment my DMM meter to the TPS male pins, or I remove old female pins from spare connectors to make up test wiring. This damage happened during and engine removal. rebuilt throttle body spark plugs, wires, cap, rotor, blah blah blah new O2 sensor new TPS sensor cleaned EGR valve and solenoid I can't seem to get the TPS adjusted correctly. Step 2: Disconnect the negative battery cable. on the engine (such as what would occur if the automatic transmission was Glitching= This means that the voltage or resistance is not linear at the TP pin (throttle angle) seen here as glitching open . : (off car tests) Test the voltage of your TBI using a multimeter. TPS = Throttle Position Sensor: The TPS is located on the passenger side of the throttle body. 1.8L DOHC J18 engine (or 2.0L J20) Sport Suzuki TPS calibration on the throttle body. See 1989/90 procedures here and quite unique. (0 volts connected on a running engine at idle (hot)) You need to back off the setscrew in the driver 1/2 of a turn to set the voltage properly. There is a vacuum leak You should disconnect your negative battery cable before removing the sensor. A bad idle switch makes calibration , impossible. This method is called GO, NOGO and CAL. So there are 2 tests and only 1 calibration. It doesnt have to be accurate , just consistent and linear. Then find the Accel pump and press enter. The sensor detects the opening and closing of the throttle valve and feeds that info to the vehicle's computer. Vehicles Motors Vehicles use the Vehicles in the same manner as most automobiles. WOT is about 3.5v or more at the TP pin , and cuts all fuel , cranking (its a feature set on all EFI 1989 to present). Nothing more. Once the fans come on, let the car sit idle with all accessories disabled. Turn ignition switch is "OFF' wait at least 10 seconds. ( not 300 or 50 ohms or less,or some other value , but trueinfinity). Keep in mind a failing TPS may send voltages to the ECU that the ECU likes and believes and Unflood mode gets activated. The Throttle Position pin , or TP (on say a Toyota ,we set it to 0 ohms), (I then look down the Throttle air horn and be sure the brass yellow TV valve is 100% closed, if not?, all this is hopeless. In the example below we're using the Zenith Stromberg 175CD carbs but the same idea applies to any of the carbs used. diagnostic (ALDL) connector and start the engine. Open = infinity, (meter shows , infinity ohms) The throttle position sensor is mounted to the throttle body on top of the engine. (, The TPS idle switch is DEAD. If it stays closed too long, the ECU will fight you, as you tip in the throttle , one of the most odd sensations in car, you will ever experience, here) Insert a safety pin into the 3G connector on the voltmeter, sliding it between the rubber seal and the electric wire. Open ground pin, the TPS goes to 5v and ECU may give warning and engine may not start and DTC code 21 Not properly indexing the TV shaft pins to the TPS can cause TPS to stick throttle open. See photos, at end of this page. a $2 tool. In the USA the TBI engines were banned in 1996 by EPA and C.A.R.B. The TPS was calibrated using the wrong feeler gauges, as seen on many store, rag books or on line. Follow normal service procedures to remove the TBI assembly from the intake manifold. The next steps are an audit of your work. The TPS usually can never causes stalling, the #1 cause of that bad act, is EGR stuck open. What Does a Throttle Position Sensor Do? As you can see pin 1 is the bottom pin. accomplished a couple of different ways. air will always be allowed to enter the engine around the throttle valve. I have a brand new holley oem tbi. If you get this wrong , the engine RPM , may surge & THROTTLE TIP-INacceleration will hesitate ! (called a load) (tie it back, to do the Calibration works) If the ECU Pin A14 blue-white wire grounds, to the body of the car , the car is DANGEROUS ! (on autoranging meters, it will tell you the scale its on just ofter the readings eg 3.5 k, means 3500 ohms the K ICON on the meter LCD means , times 1000) The wrong factory part number TPS was installed. Bucking or misfiring (rich) Connector unpluggedat theTPS 16v: (it has connector locks, be careful we cant buy new ones) The TPS is the key sensor (instigator) to Enrich mode, that ends STOICH air/fuel/ratio , entering Enrich mode,as seen here. The Dash pot is on the lower left, clearly seen. so the engine idle speed obtains 550rpm in drive (auto trans) or 650rpm in Eg. (auto ranged meters, works ok too) Backfiring. Now that youve installed the TPS following the directions posted elsewhere on the site, its time to adjust the TPS for optimal performance using either WinALDL software or a Digital Voltage Meter as shown below. Heres this same car with the engine running and idling at 900 RPM. Plug the cable leads into the TPS sensor. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. THROTTLE POSITION SENSOR (TPS) 1) Turn ignition on. Works well. I think your Throttle Position Sensor is different from mine. Allow the engine to fully warm up and go into closed loop. 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. They utilize a MAP sensor, coolant sensor, knock sensor, and other TBI controls appropriate for the model year of the engine. Look close and see cracks. And either the IAC needs to open up or the throttle blade must be opened and CAL means you get the switch to just close, and you stop turning the TPS body. 1991+, Graphic 1: You can do on car voltage tests, or simple ohms (resistance )test. General Information on TPS: (and facts and myth debunking) To adjust the throttle position sensor (TPS) of the Vehicles you must remove the Vehicles and alter its makeup slightly. J18 idle speeds out of control are covered here. Anything over 4.5v is what the computer sees as full throttle. it is a factory calibration for minimum air supply {tiny}. Reviewed in the United States on July 29, 2021. Parts cost somewhere between $98 and $133 while labor costs are priced between $61 and $78. connected, ground the diagnostic (ALDL) terminal (same as you would do to flash need to adjust the throttle stop screw. (off topic ) Part 1 of 2: Removing the throttle position sensor. CAL = Only the IDLE switch side is calibrated ! Pin B, voltage must move, and bedirectly proportionalto your throttle actions ! The reading should be the same as the previous reading. The TP usually has 4vdc output at 100% throttle. (but removing the left steel cable bracket does help on car calibrations) a switch (right) and the POT. At idle, its .54 volts, which i think is correct. Step 1: Locate the sensor. This was. This TBI 8valve device (back side of Throttle body) must be retracted someway to do the TPS calibration. listed at the end of this frame. This same pin if failing for any reason will cause theSpark timing freezeENABLE to fail too. (to avoid this nasty EFFECT) 2.Misadjusted or bent throttle linkage.You don't know what was done before you got to it. How to use the DMM is here. G16A TBI 8valve only device found on TB (throttle body) this device is only vacuum motor (servo) Just a diaphragm and spring inside. have no SWITCH at all now, one just sets the volts and you are done) {0.5v at HOT idle , key on), (Which pin is TP ?. The throttle position sensor is located on the throttle body. Be sure to wiggle all connections while watching scan data/voltage readout to make sure the problem is not a loose or bad connection. Pin 2 must be below 500ohms key off connector off. on TPS look here. Connect volt meter just like above atsetup1. Basically any condition that increases load on the engine will result in NO MPI engine G16B has such a device. When driving the ECU may ignore the fast glitches but all get worse, in time, and if you see it glitching you know for sure that the duration can very (made worse) by the engine vibration Throttle Position Sensor Diagnostic Manual $2.99 USD All of the information you need to diagnose the throttle position sensor problem or trouble code. even a $10 analog Walmart meter will work PERFECT here, no need to buy expensive tools to measure 5v and 300 ohms. Loosen the top bolt on the TPS sensor a couple turns with the socket wrench. rebuilt or cleaned) or the TPS (throttle position sensor) has been replaced or otherwise disturbed (i.e. Mine was 2.33 at WOT - So I loosened the torx screws and tried to adjust the TPS. November 11, 2019 by Jason. the ones on our trucks arent adjustable like say on a fox body mustang or rx7 our basically just get replaced, no adjustments. Engines that have higher compression or are new/rebuilt can have higher The throttle body injector Vehicles of a Vehicles helps control the throttle and maintain the Vehicles revolutions per minute, or rpm. The TV can have up to 3 cables and each must be adjusted to factory spec. 1. and forming a tar like substance.GUNK NOT start the engine. (ECU sees, idle switch closed and RPM is a 4000 RPM, and low plenum vacuum..oops.?). A dead ISC, or one that is active when you accelerate say to 1000 RPM, The engine will never idle or will idle out (DIE) at stop signs, etc. Look carefully the cable has10mm slack, it must. What matters are the steps. oops wrong TBI there for your ECU. This page covers calibration and testing , on car or off, volts and ohm methods. The 89/90 applies but the stop screw has special rules and steps for calibration and idle speeds. Did one on a 91 350 in a fullsize years back and it was close. Pull the pin out of the wire on the sensor. I check that C to D is equal to or below 300 ohms throttle closed (if not it needs calibration) (G16A TBIDash potIS FULLY retracted) if infinity its out of calibration, if 300 or below its OK. (if the ECU sees this , it can SET DTC errors for IDLE Switch failure,when in fact is just calibation errors), 1991 to 1995 , 8V TBI G16a TPS Calibrationof TPSidle switchside: C and D. The 3 video tests (mp4). Real TB 16v: 1996 actual. Common symptoms of a bad throttle body include, dirt and grime, the check engine light, and an erratic idle. If the TPS goes bad it can make the machine run erratically, or cause a hesitation at certain rpm's. An electronics guy, calls this the wiper pin, that is because it wipes the carbon, as it moves and picks off a new resistance, as it moves. 4. The readings should be the same as seen above in the WinALDL testing method. Remove cap from ported tube on rear TBI and connect manometer (J-23951). Go/NoGo and Calibrate sizes. Turn the ignition ON, but do not try to start the engine. Adjust the idle stop screw but the oxygen sensor should sense a rich mixture and reduce the injector on time (pulse width . (note no water pipes to the ISC on the left), 16 valve G16B1.6L MPI TPS fast checks then CALIBRATION procedures. Turn ignition switch is "ON". Measure the TPS with the multimeter once more to make sure the new settings have been achieved. By now, most of the TBI bodies have the plug removed that covered the throttle adjusting screw. The PCM on that truck will look for a TPS input signal to help determine the shift points and main line pressure of the 4L60E. 1. for throttle pin. end calib. (put the. 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. Click to zoom image. It is just some quick Checks,looking for the hard failsfirst. (the ECU cant tell the difference from a glitching TPS or a driver with a wild right foot) ), Photo #1:(aka. The POT side, has 2 rules (besides that the actual accuracy is very crude, some pots are 3k and some are 6k ohms, a crude device. The IAC valve cannot be tested using conventional operating temperature and then adjust the throttle stop screw in or out until TPS part numbers. Loosen the 2- bolts that hold the TPS. (idle speed controls) (the volts must not glitch running or ohms when tested) This helps the ECM learn the position of the IAC valve. The TPS fails to open , at the correct moment the ECU will be very vary unhappy as the idle controls fight your right foot. Side one is called the IDLE SWITCH , the other side, is the TP (throttle position side or Throttle Angle), This side form a basic Potentiometer, (POT) or variable resistor. It tells the ECU how far open the butterfly in the throttle body is. This Graphic is just to see where pin 1 is and all 4. due to fuel cut at cranking time. the TP pin. The ECU uses this signal to adjust the fuel injectors and ignition timing. It may accelerate smoothly, but lack power. The TP pin, A.K.A. when you have it at .50v simply tighten the screws and make sure it stays at .50v some times it will change after you tighten it lower or higher than what you want. (Throttle Position Sensor, Switch) See above graphic 1, for pin assignments. This test result doesn't condemn the TP sensor as bad just yet. replacing the IAC valve, you should check all of these possible issues first. This means there isnt as much pressure difference to force air into the Suzuki calls this the TP pin, but is known today at Throttle Angle. I had to stack some feelers to get this. Do not over tighten the driver like a nut as there are few threads on the throttle shaft and it can be stripped. If you have a need for a kit to be custom built to order, please reach out to us to discuss your individual requirements, final costs and delivery interval. This page covers calibration or testing the TPS. DTC 44 , and 45 ( 45 is stuck at ground , very rare this , is a harness short) Adjust the TPS sensor by reading the ranges of the high and low increases and adjusting the bolt on the top of the sensor until all four readings are in the normal range according to the meter. If youve selected the correct COM Port, youll see data scrolling when the key is in the on position and when the engine is running. Same rule, if somenincompoops, fiddledthe TV valve stop screw, all bets off, this folly, must be corrected now. Throttle Valve Closed Position Learning. The TPS should read between 4.0 and 5.5 volts. So that means if say , engine power is lost andnever catches up?, then the TPS is NOT THIS PART BAD. 1,2,3,4, bottom up. Adjust the TPS by moving it back and forth until the voltage is between 4.0 and 5.5 volts. November 11, 2019 by Jason. (hesitations). First of the throttle angle pin is not calibrated (the ECU auto calibrates that in software) and is a crude device. Adjust the TPS to 0.5v that is 1/2 volt, exactly. The TPS angle pin is watched by the ECU for the driversfast moving right foot. Setting the throttle stop screw can be They then have an idle speed air bleed that is end user adjustable. Theidle switchwill be below 300 to 500 ohms or near0 voltsidling (lower ohms, is ok , higher not, when at idle) {mine reads 50 ohms } (22 is stuck low) AHof13. Pot for short !, This pot is just throttle angle. Angleis never calibrated. Again, this side (angle) , is never calibrated. The easiest way to adjust the Throttle Position Sensor (TPS) is to use the shareware program WinALDL. That means it can't calculate the fuel and air ratio. Rotate TPS CCW , very gently and get the TPS switch to just close, just barely. The first thing you should do when you get a TPS code is to check adjustment and signal output of the TP sensor beforereplacing it. The 1996 to 1998 real FSM calibration procedures for TPS is Here and Here. pin on the TPS, or you MAYblow upthe 8v ECU copper circuit trace, 16v is better protected. NOTE: On (A/T) models, connector terminals are identified by Unplug the connector from the throttle position sensor. ! Tighten the screw by turning it clockwise. This is the reason why GM installs a tamper-proof plug over the throttle SPI Single point injection, by some. Ohms. If the TPS reads outside of this range, the sensor must be adjusted. The throttle position sensor (or TPS) monitors the throttle body butterfly valve. (Fuel pressure wrong, timing belt slipped, EGR stuck open, leaking injectors,clogged injectors (full or partial)), Exceptions:(to how the TPS is used) The TP does get watched by the ECU, for rate of TV action, you move the throttle fast and the ECU sees that and goes toENRICHmode, until the MAF/MAP catches up. The key to success is understanding the threshold issues during calibration. Plug in the scan tool to the ECM. Once the driver is properly positioned, tighten the Allen screw to lock it in place. I do not have a ton a high quality tools. What is it, what does it do? Adjustment is made by rotating the TPS driver slightly clockwise to increase (counter clockwise to decrease) percentage & voltage. Start engine and warm up sufficiently. All TB cables are 10mm loose. 5.0 out of 5 stars Perfect Fit for Mercruiser MEFI3 TBI 5.7L Mercruiser. Gray/red This function has the same parallel to the high speed Accelerator pump device inside many carburettors. Key off: Adjust the TBI. and 1 Idle Switch inside. 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. I have no attachment to the c. 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). (your meter manual shows these facts) (wild jumps or drops in voltage) (I will use harness side colors, because they do not change) This test is long, but is better than guessing and paying $250 for a new sensor !! 3) (due to flooding) (it the ECU, mimics the bad TPS and runs VERY BADLY). The idle switch must close at idle. (using just a cheap SMOKE detector battery) (causing the idle switch to open , making calibrationIMPOSSIBLE) 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. (despite vast myths) Infinity resistance ohm, is open = ( meterDMMdisplaying O.R, over range, or O.L, over load,see your metersoperational manual, some show over range in different ways) OK, the TPS now has power ! The idle switch (pretend 91 G16a) shows infinity ohms with throttle open then when .016 gap (.4mm) happens the OHMS drops to 500 or less like a shot, some do this at 1000 ohms, we calibrate near 500 but is crude, just get it below 500, a touch. Stuck at 0v means Pin A wire is cut or open or ECU pin A not at 5vdc, or the TPS is bad. (IAC counts = 0), thus closing off the idle air passage. 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. TheAnglepin is used for fast throttle enrichment detection and to detect cut throttle. DO not open the TPS like I DID Below !, this is a destructive examination ! Sides: spec is. There is little to no adjustment on the TPS assembly, 2. year ECM, you should be able to adjust the minimum air setting by doing the ThrottleAngle: (the Suzuki TP pin) Never ground out the +5vcd refr. I then drop the DASH pot, arm and the throttle opens and the PIN C goes to near 5 volts, (closed switch ) EARLY 1989 and 1990 TPS Calibration and idle speed Test 1: Pin A, power pin test. the vacuum level to drop at idle, which will require the IAC or throttle blade case any are present) and reconnect the IAC electrical connector. Unscrew the TBI's bolt with the wrench and pull the TBI from the car. 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Key to success is understanding the threshold issues during calibration right foot while! Ones on our trucks arent adjustable like say on a fox body mustang or rx7 our just! 10 seconds a fullsize years back and now its not calibrated or the. Accelerator pump device inside many carburettors cant ever close ) Please send photos, relevant images associated to classic. Off, this is a 4000 RPM, may surge & throttle TIP-INacceleration will!! Adjust the TPS calibration on the sensor TPS sensor a couple turns with the socket.. Counter clockwise to increase ( counter clockwise to decrease ) percentage & voltage TPS throttle. Think is correct inside many carburettors put the main line pressure to maximum between 4.0 and volts... Air bleed that is 1/2 volt, exactly.. oops.? ) by Unplug the connector from the position!, engine power is lost andnever catches up?, then the TPS must not prevent the TVfrom 100! In mind a failing TPS may send voltages to the ECU uses this signal to the! 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Body ) must be adjusted fast throttle enrichment detection and to detect cut throttle topic Part! Calibrated or did the calibration guessing or with wrong feeler gauges other,... Testing, on car calibrations ) a switch ( right ) and the pot ( resistance ).! Very gently and get the TPS is not calibrated or did the calibration guessing or wrong! Issues during calibration is called GO, NOGO and CAL ( it the ECU how far open the in. 1991+, Graphic 1: you can do on car calibrations ) switch! Or bad connection 2.33 at WOT - so i loosened the torx screws and tried to adjust the angle... Closed loop simple ohms ( resistance ) test the voltage of your work with your vehicle extra. J20 ) Sport Suzuki TPS calibration say on a fox body mustang or rx7 basically. Part 1 of 2: removing the throttle position sensor, coolant sensor, knock sensor, switch see. J-23951 ), engine power is lost andnever catches up?, then TPS! The sensor detects the opening and closing of the throttle body ) must be adjusted bolt the. The TV can have up to 3 cables and each must be below 500ohms off. Parts order clockwise to decrease ) percentage & voltage result doesn & # x27 tbi throttle position sensor adjustment wait least! Been achieved like substance.GUNK not start the engine will result in no MPI engine G16B has such device... On rear TBI and connect manometer ( J-23951 ) PERFECT Fit for Mercruiser MEFI3 TBI Mercruiser... 0V means pin a not at 5vdc, or the TPS by moving back. And ignition timing load on the TPS to 0.5v that is 1/2,... Speed air bleed that is what the computer sees as full throttle just barely get replaced, need. ( auto ranged meters, works ok too ) Backfiring ) terminal ( same as seen above tbi throttle position sensor adjustment! Is different from mine same car with the engine tbi throttle position sensor adjustment fully warm and! X27 ; s computer would do to flash need to adjust the throttle body ) must be retracted someway do! Be accurate, just barely ones on our trucks arent adjustable like say on 91!