the Dash Pot VSV valve or the DP hose,etc. The idle switch must be closed and near 0v running or the timing freezeand many things will fail. Michigan. DC voltage is measured between pins Sensor (+) and Ground (-). From what I have found online, it says it could be the throttle body or the position sensor. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. If the cap is still there, use a small punch to knock it out. case any are present) and reconnect the IAC electrical connector. There's nothing to adjust. (no more Code 44s now !) 3. Icle > IAC Startup > IAC Park Position Using the software - Idle ICF (tachometer icon) > IAC Parked Selection Close the hood of the car. rebuilt or cleaned) or the TPS (throttle position sensor) has been replaced or otherwise disturbed (i.e. 180F+ coolant temperatures. November 11, 2019 by Jason. Turn ignition switch is "ON". neutral (manual trans). Car won't accelerate, lacks power when accelerating, or accelerates itself. the ones on our trucks arent adjustable like say on a fox body mustang or rx7 our basically just get replaced, no adjustments. the K shows up on the LCD display , or omega sign or M for million. This may be .045-.065 volts. Push down on the throttle by hand until it is completely open and check to see if the voltage increases while pushing down on the throttle. The POT side TP SIDE: lean what infinity means by setting meter to 2k (200) ohm scale , with leads held in air. 2. (will cause , engine that loves to flood ,cranked cold) but does make calibration easy, sure (1/2 joking). The ECU watches for legitimate fast throttle angle changes, and when it sees them it BELIEVES them (A.Turing brain,mind set) and that they are DRIVER CAUSED. ( except some 1.3L Carb. The readings should be the same as seen above in the WinALDL testing method. 1985-1992 Firebird 305 and 350 TPI. (cruise , throttle and a/t kick down cables) Adjust the TPS by moving it back and forth until the voltage is between 4.0 and 5.5 volts. With your laptop connected to the ECM Data Plug, open the WinALDL program and turn the car ignition to the on position but DO NOT START THE CAR. Way to go Ford. Pot for short !, This pot is just throttle angle. IDLE SPEED (4-CYLINDER) or potentiometer, or variable resistor. (my comments are on a normal hot running engine). Percentage & Voltage Method using WinALDL. The original tps costs too much. Step 2: Disconnect the negative battery cable. NOTE 1Exceptions: G16a TBI EFI 1989/90 ONLY using these special steps only. Plug in the scan tool to the ECM. provided earlier. maintain a set idle speed. You may cause the throttle to stick open. All steps here: Photo 6: The idle stop screw must never be turned. or hackers messed up my car? If you're unsure how to . This will allow you attach the leads of your Volt Meter to the various pins for testing. But does in LIMPHOME. Any one of the above issues can cause a an IAC fault code to set in the ECM. TheAnglepin only needs to be linear, (foot action to Ohms(volts) It mustnot glitchas you drive. See the schematics here. (if the auto ranger shows 2.01 K that means near 2000 ohms, K means times 1000. TPS was removed, and the internal pins were, The G16a Dashpot fails to ever retract. PinB(TP pin) below, the voltage will very, for near 0v to near 5v, as the throttle is advanced. this would result in it getting wedged/stuck closed in the throttle bore), some (but removing the left steel cable bracket does help on car calibrations) it is a factory calibration for minimum air supply {tiny}. Turn the TPS center shaft and see that the voltages are linear and that they never glitch. It may feel as though the car simply doesn't accelerate as it should, and jerks or hesitates as it picks up speed. Backfiring. valve) closes this DP device (vacuum sent) after say 3 to 15seconds after a start) If not fix this first. Where To Buy The TPS And Save. There are The purpose of this page, is to save you $250 for a new sensor and show the test and calibration steps. Turn your car off by turning the key counterclockwise. special tools available that are designed to test GM IAC valves, but I have (Infinity) Say the 1991 car has a 1989 actual engine, (or parts) and not 1991 . The TPS fails to open , at the correct moment the ECU will be very vary unhappy as the idle controls fight your right foot. Regardless of the side draft carbs being used, you must have 100% throttle rotation prior to installing the TPS. GO = Closed IDLE switch ( less then 300 ohms) (300 ohms is TPS spec, , ECU spec, i think is 500) I use 300 ohms. Connect the voltmeter red lead to this pin and place the black lead on a good engine ground. All pins on allMPI TPS look like this and rules and wire colors ! ( resistance meter){ near 5volts} See hopeless. It may accelerate smoothly, but lack power. At idle, its .54 volts, which i think is correct. The Advance must be smooth. Myth 1: No, the TP side does not set fuel injection rates, that is, the ohms (voltage) does not get scaled directly to injection quantity. (all makers of this part, have rip off prices, its no Toyota, so they can do that) aka, set at threshold of closure. Put back the Dash pot, as you found it. 6) performed. adjustments dont (factory set) (the bracket does come off easy). but at with the pedal to the floor, it only goes to 3.9v (the old sensor did this too, probably didnt need replaced.) Anything over 80% is acceptable and in this example its 92.9% as you can see in both the Dash and Sensor Data display. Common symptoms of a bad throttle body include, dirt and grime, the check engine light, and an erratic idle. Meter to B and D ,(throttle angle) ohms varies from about 1k to 5k ohms (this angle and resistance, is crude!, but it only needs to vary and not glitch. Key off: This program lets you connect your laptop to the ECM to conduct data logging sessions while driving the car. The TPS Angle checks, prevents this hesitation; that is it prime jobEnrich mode. even a $10 analog Walmart meter will work PERFECT here, no need to buy expensive tools to measure 5v and 300 ohms. (it is just a vacuum servo motor, a vacuum actuator Go, & NoGo feeler gauge chart: Suzuki in black ( withoddGM deviances) USA FACTS ! This TBI 8valve device (back side of Throttle body) must be retracted someway to do the TPS calibration. The rule for WOT is About 75% and above Throttle angle is Unflood mode. It doesnt have to be accurate , just consistent and linear. Its a brand new Holley oem style TBI which came with a new tps on it. We must first discount, some the nincompoops reasons to messup (or bad luck) the TV or TPS indexing: See JARGON here If it fails on TB and is good off body, , TPS was mounted WRONG ! TPS switch open, LIMPHOME IS IN EFFECTcar starts, no idle controls, at all , ISC will be dead. I mention this, because the ground can be broken to the TPS at pin D (p4-16v)and the car will never start. TPpin is the Throttle angle pin (wiper) of the TPS, not the idle switch. There are many failures on the EFI system that can seem like a bad TPS and is not. Loosen the throttle position sensor retaining screw with a Phillips-head screwdriver. If they messed up the TV stop screw , here is the easy fix (see my crude solutions here). Start the engine to test the TBI. (all ways) (but the idle switch , yes idle will be wrong if the switch is dead.) The TP Angle pin carbon section inside, is worn as all do , eventually), Last 1991+ 8v TBI, and newer TPS Calibration procedures, packed in GUNK causing TV to not fully close. 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. The ECU now throws, DTC errors for the TPS. Place the TBI assembly in a suitable holding fixture to prevent damage to the throttle plate and injector electrical . The TV must not bepacked in GUNK causing TV to not fully close. 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. (over 75 % is WOT most cars) ,due to, toolateIDLE drop out or tooearlyidle release,. HACKED OPEN! Gray/ yellow 0 Volts. 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. keep your foot off of the pedal You want the TPS reading in both the Dash & Sensor Display to be as close to zero as possible (-0.3 in this example). When you start any TBI car, the Dash Pot must retract before 30 seconds expires or that part is bad. New wiring harness extension assembly to extend the throttle position sensor wiring for the listed applications. If the pin is stuck , the voltage does not change, the TPS is bad. Plug in the scan tool to the ECM. The FSM instructions, are are linked in every section on calibation and does cover this step. (even glowing cherry red) Ensure all vacuum components are functioning properly. NOTE: On (A/T) models, connector terminals are identified by Adjustment is made by rotating the TPS driver slightly clockwise to increase (counter clockwise to decrease) percentage & voltage. Never hot wire or ground out the ECU +5vdc(Ref) pin. Then rotate the TPS CCW, then rotate CW it until the TPS (pin1 and 2 )just barely(at the threshold) go toInfinityon, Remove Feeler gage, note the Ohm meter (Resistance meter) shows continuity (less than 300ohms) (ECU expects less than 500 ) (do not expect zero ohms! Graphic #2 This is not calibration yet, this is just checking throttle angle. (<<>>===---. the 2 (not shown) wipers short the inner and outer rings as they wipe. (not indexed to the body correctly, per the FSM) The feeler gauge goes here above , to set the TPS calibration. Replace the TBI by placing it back in the engine. In side the TB , Throttle body is a Throttle Valve, TV. 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. BEGIN TESTING the G16A, TBI engine 1991- 1995: (8 valve , engine only) The 3 video tests (mp4) The Dash Display TPS reading is almost Zero and the voltage reading has moved into the 0.50 volt range. The ECU uses this signal to adjust the fuel injectors and ignition timing. Theangleside never sets idle speeds, ever. Tighten mounting bolts. Basics Of The Throttle Position Sensor (TPS). You must leave the connector connected,andus a back probe technique, to read the voltages. This was. (Throttle Position Sensor, Switch) See above graphic 1, for pin assignments. 4. Buzz words: Did one on a 91 350 in a fullsize years back and it was close. the TPS is out of adjustment or the sensor has failed. The TPS angle pin is watched by the ECU for the driversfast moving right foot. close all of the way, There is carbon buildup If this pin fails, for any reason, TV cables (up to 3 cables) not set at10mm play, or TV boreblocked in carbon,these faults must be cleared first or theCalibration steps will all be wrong. This method is called GO, NOGO and CAL. MPI92 -98 1.6L only USA. diagnostic (ALDL) connector and start the engine. a switch (right) and the POT. The TPS should read between 4.0 and 5.5 volts. This is just to show the guts and how it can crack inside. Any voltmeter can work here, even a $10 one. Tighten the two bolts in the sensor so it will no longer move. (but can if the ISC goes dead and other failures, prevent air flow to the engine or very weak fueling as this idle switch will shut down, the ISC) Photo 2: TPS (TBI G16A only) This TPS connector shares the injector connector. Trouble code definitions. The pin 3 throttle angle varies from about 1v to 4v (non critical) but must be linear in action (foot throttle) and not glitch. might be able to bend the gold tab a bit, usually on the adjustable tps you loosen the two screws holding it on and twist the unit then tighten the screws. Push the multimeter pin into the TPS screw and check the voltage. It should be mounted to your throttle body, which is on top of your engine. The TPS can crack inside (see photo just above) or wear out inside and give totally random symptoms. As you can see, there are many issues other than a faulty IAC valve that Click to zoom image. (blocking it open). NORMAL. Voltage Method using a Voltage Multi-Meter (VOM). Remove the key from the ignition. year ECM, you should be able to adjust the minimum air setting by doing the f The TPS was mounted wrong to TB side, and not indexing to the internal tabs , thus jamming the TV at idle and making TPS calibration . TBI, the 8 valve engine with black top valve cover . Your multimeter should read 0.42 to 0.45 Volts DC with the throttle plate closed. Move the safety pin and positive wire to the 3F connector and repeat the process, checking the increase in voltage. 500 or less) up to a max of (3000 to 6500 ohms), as you move throttle from min to max. G13 engines, do not have EFI , so hit the back button) Hint watch for drop outs.! If you get this wrong , the engine RPM , may surge & THROTTLE TIP-INacceleration will hesitate ! Open the hood of your car and locate the TBI. whats wrong with it? side called by Suzuki TP pin, is theThrottle anglepin, and allows for the ECU to enrich fuel with a fast right foot. loosen the TPS screws until just a tad loose. (IAC counts = 0), thus closing off the idle air passage. Figure1 It can also be used with the cars ignition turned on but the car NOT running to check other data relative to the TPS. 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