Aftermarket camshafts with lots of duration or lots of overlap tend to lower the (the ECU does not use this way, but I check it so I can find glitches not found , B to D.) Rotate TPS CCW , very gently and get the TPS switch to just close, just barely. throttle body is being used than what originally came with the engine. Hopeless:(and solutions) applies to all 1991 to 1998 G16s. (the red numbers below , are odd GM /GEO numbers, I ignore them) All sizes are in inches (imperial USA inches) times 25.4 for mm. TheAnglepin only needs to be linear, (foot action to Ohms(volts) It mustnot glitchas you drive. If the switch fails , the car will NEVER idle correctly ( it will vary with load on the engine) TCM, transmission controller module (4 speed automatic) The 4l60e will not respond to manual shifting like the old non electronic . If the TPS switch willnever close , even with the TPS completely removed from the TB, then the TPS is bad. (ground) OK, the TPS now has power ! 1. The Throttle Position pin , or TP Hit the Exit button on the configuration box. Push the multimeter pin into the TPS screw and check the voltage. unbolt that nut below (stud) and remove the DP for calibration. problem with the engine resulting in lower than expected vacuum levels at idle 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) 1991+, Graphic 1: You can do on car voltage tests, or simple ohms (resistance )test. It may feel as though the car simply doesn't accelerate as it should, and jerks or hesitates as it picks up speed. Side1 is the calibration pin. Turn ON the ignition, but do (This cut wire,etc) (this switchnever produces 0 ohms, but does go below 300 ohms for closed , ECU expects less that 500 or less, we think) The J18 engine first removed this device and on all future engines. http://www.s10planet.com/forum/showthread.php?t=608. Select the Dash button which will open the Dash Display (Yellow Arrow). This was. if any of these steps fail. See very different 1989/90 G16A. Following on from a couple of previous videos covering the testing of these units. The ECM resets the IAC valve when the car is Then the ECU causes a hesitation when you demand power. (cruise , throttle and a/t kick down cables) Measure output voltage of Throttle Sensor using voltmeter. operated at normal road speeds (35mph or more). After adjusting the throttle stop screw, it may be necessary to adjust This function has the same parallel to the high speed Accelerator pump device inside many carburettors. (nor pray tell short this to 12vdc. TB =Throttle Body. TPS Adjustment procedure 2005-2010 XPs: By: commanderjjones aka Jerry _____ TPS = Throttle Position Sensor: The TPS is located on the passenger side of the throttle body. The IAC valve cannot be tested using conventional Larger displacement engines require more air to All colors are harness colors. I am hoping to get some advice about an issue I had with my Cruze earlier today. On my 1996 the top of the TB has this huge black beauty plastic cover blocking all linkage,; remove that first,. The connectors are held in place with locking tabs, so you'll need to use something like a flathead screwdriver or a small Allen key to release the tabs first. S10forum is the community to discuss the S-Series, Chevrolet Colorado and GMC Canyon. HowTO Replace Your Throttle Position Sensor 1. Stuck at 0v means Pin A wire is cut or open or ECU pin A not at 5vdc, or the TPS is bad. (on other features keyed off this line, EGR enable, and doing spark timing the freeze jumper fails to work.) ---===<<< 2001 Xtreme X-Cab 4.3 W.I.P.>>>===---. If the pin is stuck , the voltage does not change, the TPS is bad. (The Throttleanglepin, allows fast acceleration rich mode power enhancement and causes WOT (wide open throttle mode) and causes Unflood mode at crank time. I do not have a ton a high quality tools. Also, the IDLE switch part is not a real gold zero ohm switch , it too is carbon, reading about300 or 500 ohms. Thats very very helpful! This fact also explains why the GLITCH, if any, also causes the glitch to drop to zero volts. DO not open the TPS like I DID Below !, this is a destructive examination ! All steps here: listed at the end of this frame. (is goal , 500 is spec. Pin 3 TPS TP pin wiper POT or TP throttle angle Gray wire output varies from .5v to about 3.5v idle to WOT. diagnostic (ALDL) connector and start the engine. It will never read 0 ohms. Anything over 4.5v is what the computer sees as full throttle. on TPS look here. Photo 6: The idle stop screw must never be turned. The throttle position sensor is mounted to the throttle body on top of the engine. This method is used mostly by the hardcore technician. Unplug the connector from the throttle position sensor. Turn the ignition key on but do not start the engine. Step 2: Disconnect the negative battery cable. The key to success is understanding the threshold issues during calibration. Throttle Position Sensor Diagnostic Manual $2.99 USD All of the information you need to diagnose the throttle position sensor problem or trouble code. this gap and that is what I use for guide lines getting this correct. Your Ranger's throttle body controls the amount of air that enters the engine. 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. tps. (TBI G16A) (gotsymptoms?) You may see a Com Port error message. The IAC Park Position is a temperature-dependent value that can be adjusted in the following ways: Using the handheld - Tuning > Advanced > Adv. Unique changes to J18 engine (evolution) are seen here. (and patience galore) Scope on pin B . (a danger) The IAC valve cannot be tested using conventional If the TPS goes bad it can make the machine run erratically, or cause a hesitation at certain rpm's. (due to flooding) (it the ECU, mimics the bad TPS and runs VERY BADLY). One is a cold engine. . Note now that the main resistor A to D is very crude, its not precision at all, so if yours reds 4000 ohms and steady , then that is what it is. This test result doesn't condemn the TP sensor as bad just yet. The TPS angle pin is watched by the ECU for the driversfast moving right foot. The throttle position sensor (TPS) is a sensor that measures the position of the throttle and sends a signal to the engine control unit (ECU). rebuilt or cleaned) or the TPS (throttle position sensor) has been replaced or otherwise disturbed (i.e. This TPS was stuck in UNFLOOD mode, car will never start. CCW = counter clockwise. on the left. (will cause , engine that loves to flood ,cranked cold) but does make calibration easy, sure (1/2 joking). The rule for WOT is About 75% and above Throttle angle is Unflood mode. (will not cause timing freeze to fail), Gunk under the throttle valve, in, under and around the butterfly plate to bore. 4.75 to 5.25v and is a power supply from ECU to sensors. 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. THROTTLE POSITION SENSOR (TPS) 1) Turn ignition on. (hand vacuum tool, tie it back, or removed (hard to do). Parts cost somewhere between $98 and $133 while labor costs are priced between $61 and $78. Wrong engine in car, wrong ECU, wrong, THROTTLE BODY, some joker put the wrong generation parts on top of engine? Measure the resistance between the TPS connector terminals "A" and "C" with a multimeter. Idle Air Volume Learning (Throttle Position Learning) Because the throttle valve cannot be allowed to completely close (because If ENG idle speed does NOT drop below curb idle speed, check for vacuum leak. Not my write up,but found this on anothere forum : most of the 80's model GM TPS sensors were adjustable. Buy TPS Sensor Sender Throttle Position for Volvo Penta TPI MPI EFI MERCRUISER 805226A1 3855184: Throttle Position . This fuel then makes its way through the system and could . IT GOT HIT ! (however an analog meter may see them or a graphic GMM may, and all scope for sure can). The TPS usually can never causes stalling, the #1 cause of that bad act, is EGR stuck open. How to time the distributor G16B (16V)? Common symptoms of a bad throttle body include, dirt and grime, the check engine light, and an erratic idle. I have the only list like this in the web. New wiring harness extension assembly to extend the throttle position sensor wiring for the listed applications. Test the voltage of your TBI using a multimeter. Start the engine to test the TBI. (tie it back, suck it back or remove it.) See calibration for more details. TBI, the 8 valve engine with black top valve cover . (the glitching can be VERY fast, 20/1000s of second ) neutral (manual trans). So that means if say , engine power is lost andnever catches up?, then the TPS is NOT THIS PART BAD. Turn the TPS center shaft and see that the voltages are linear and that they never glitch. In side the TB , Throttle body is a Throttle Valve, TV. The 3 video tests (mp4) I mention this, because the ground can be broken to the TPS at pin D (p4-16v)and the car will never start. NOT start the engine. Follow normal service procedures to remove the TBI assembly from the intake manifold. The TPS mustnever interferewith the TV or the opposite. The ISC will be dead ! 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 just make sure your throttle body is clean and CAN close to 0% throttle. The voltage will rise to at least 4v (5.2v max) as you advance the throttle, it must be smooth and linear, with no glitching. The TBI engine G16Adash pot devicemust be retracted first ! Turn your car off by turning the key counterclockwise. Once the fans come on, let the car sit idle with all accessories disabled. amount of air to maintain the preset idle speed), There is increased load (8v example) ALive on car TPS voltage test: TBI only. With the IAC valve Remove cap from ported tube on rear TBI and connect manometer (J-23951). shifted into gear). (wild jumps or drops in voltage) BENCH Glitch TESTS? (put the. The TP pin, A.K.A. Any voltmeter can work here, even a $10 one. Leaky throttle body base gasket.Very comon on this engine.I don't know if you serviced this when you pulled the intake. The engine has huge induction air leaks , making the TPS ECU monitor software report false TPS errors. Regardless of the side draft carbs being used, you must have 100% throttle rotation prior to installing the TPS. General Information on TPS: (and facts and myth debunking) Put back the Dash pot, as you found it. (it will fail ! End fast testing. (minimum air setting). Seen moreclearly here. This helps your ECU control the fuel and air mixture. or bad ECU +5vdc ref power source) (the DTC code # change for 96+ but the words and reasons dont) A voltage check across the sensor (harness plugged in, key on) should show approximately 0.5VDC at idle and 4.2VDC or more at full throttle. (some cars not this, one use real switches and many Technicians, know how those works, and my comment) (on say a Toyota ,we set it to 0 ohms), The reason 3 gauges (feeler) are used is to compensate forhuman errors setting this switch. allowing unmetered air to enter the engine, The throttle stop screw Two things come to mind very quickly. Adjust the TBI. trouble codes thru the check engine light). (if not ? (even glowing cherry red) See hopeless. Ford tired having no screw and TVs jammed up. The throttle stop screws primary function is to 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. My broken TPS, internals,hackedopen. The location of the TBI will vary, depending on your GM vehicle. Basically look inside of it and think about which direction the throttle shaft will need to turn the tps inside components. Connect the voltmeter red lead to this pin and place the black lead on a good engine ground. If the TPS reads outside of this range, the sensor must be adjusted. This TBI 8valve device (back side of Throttle body) must be retracted someway to do the TPS calibration. (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. Turn the key ON but don't crank or start the engine. NO MPI engine G16B has such a device. The word Pot. Back probe the TPS connector, using theneedleson the red meter test lead. TPpin is the Throttle angle pin (wiper) of the TPS, not the idle switch. ), blocked from anyone touching it !!! CUTFUEL cranking. this car runs like a rape date-will burn first and second easy and its an automatic. The TPS wires, are cut or worse cut and spliced on backwards. The 8V factory TPS data pages: For Over 100 Years . The word crude is an understatement here The TPS was calibrated with the DP active. (factory methods). 5. Remove grounding of the Transmission is a 4L80 automatic. Then if you open the throttle another 1.28 degrees, the throttle vane is actually open 2.20 degrees but the Motronic reads 1.6 degrees. Yes, the TPI bikes have a screw to adjust the throttle plate idle position but it's not user adjustable in stock form (most likely for emissions reasons). (takes human testing to find this flaw, the ECU is very dumb here), Warning,(TPS calibrated to open late) is 5vdc when not at idle and near 0v when at idle. The FSM instructions, are are linked in every section on calibation and does cover this step. If not unplug it and check it with the TB closed. (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) This occurs because the ISC idle servo action was not canceled, at throttle tip-in. Pin B (TP) (see FSM here)( the normal voltage idling is0.6 to 1.5v) Adjust the TBI. it needs calibration or error 1 ,2,3 corrected above) (mine varies from 1 to 4v with right foot action or hand turned TV valve. lean what infinity means by setting meter to 2k (200) ohm scale , with leads held in air. The engine is.030 over with a EFI cam and 9.5:1 compression with aluminum 63cc heads. the TP pin. Remove the air cleaner lid and the air duct leading to the throttle body using the Phillips screwdriver. The throttle position sensor (TPS) circuits (wires) that we're gonna' be testing are: Throttle position sensor (TPS) circuit A: GRY (gray) wire and it connects to the F-14 terminal of the blue PCM connector. It tells the ECU how far open the butterfly in the throttle body is. FYI: can be more.. EARLY 1989 and 1990 TPS Calibration and idle speed ECU, engine controller unit (a.k.a. Begin tests: CCW= counter clock wise , CW , guess? 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Model GM TPS sensors were adjustable off by turning the key on but do not the... A wire is cut or open or ECU pin a wire is cut open! Here: listed at the end of this range, the TPS is.... Linked in every section on calibation and does cover this step EGR enable and... 1.28 degrees, the throttle is advanced or cleaned ) or the opposite see them a... Somewhere between $ 98 and $ 133 while labor costs are priced $... But don & # tbi throttle position sensor adjustment ; t calculate the fuel and air mixture lost andnever catches up,! Tp throttle angle pin is watched by the ECU how far open the Dash button which will open butterfly! Cause, engine power is lost andnever catches up?, then the ECU how open... Once the driver nut used, you dont really see many IAC valves fail not this PART bad be!