I tested the TPS with an ohm meter and these are the readings I got: Terminals 1 and 2 2.88; Terminals 1 and 3 throttle valve fully closed 2.79; Terminals 1 and 3 throttle valve fully open 0.88. According to the repair manual terminals 1 and 2 should be between 2.5--5.9. 1 and 3 should be between 0.2--5.7 with throttle valve fully closed. So both those readings seem good, but with the throttle valve fully open it says it should be between 2.0--10.2. And my reading the number actually goes down from 2.79 fully closed to 0.88 with the throttle valve fully opened. So is the TPS bad or does it just need adjusting if that's even possible?
You back probe the sensor,then turn on with the key, engine off
& take voltage readings.
Ohm meter is a waste of time.
All automotive work involves looking for voltage drops
You need your vehicles wiring diagrams
Your going to have two sensors on any TPS,
one 0 to 5V & one 5 to 0V when you open & close it
If not close to that, then it is either adjustable or worn out
SOURCE: Adjust valve clearances 1987 toyota corolla
Im assuming its an 4AGE!?
http://www.ae92gts.com/ae92gts_valve_adj.html
And here one of my favorites...;)
http://www.billzilla.org/4agstock.htm
SOURCE: I have a 1999 Toyota
It could either be the speed control switch or the resister pack near the blower.
SOURCE: 1984 toyota corolla 1.6 engine. How do i adjust
Carbureted models have a fast idle cam on the throttle,It is a screw that sets against a movable part,called the cam,when the engine heats up,the cam will drop upon tapping the gas pedal.Set the carb,while the engine is cold,by tapping the gas pedal,then adjust the fast idle cam screw by turning it in,with the engine running.Start out by turning the screw in a full turn before starting engine so it will run,then adjust the screw as the engine runs.
SOURCE: po401 and po420 (95 toyota previa Van super charged engine)
Check for air leak into system after MAF.
Check for
vacuum leaks on intake manifold,
the air tube between the air filter.
intake manifold vacuum hose.
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clean throttle plate with Berryman carburator cleaner
SEE sample picture HERE
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Check for loose or no connected vacuum hose(s).
Take it for a test drive.
Please rate my answer if it's useful to you.
Cheers,
Mustgo
SOURCE: Corolla 1.6 VVTI motor the
With engine Crankshaft on TDC and cam timing set correctly this is the position where No. 1 cylinder is firing at the start of the power stroke. At this point No. 4 cylinder is also at TDC but is just at the end of the exhaust stroke and starting the intake stroke so the exhaust valve will be almost finished closing and the inlet valve will just be starting to open. This is referred to as the inlet and exhaust valves rocking.
You should get an advanced obd reader to be sure that the TPS is not getting worn out in that spot. You can also use a VOM to check the TPS is you have a recording MIN/MAX feature on the meter. To test this you need to unhook the TPS (throttle position sensor) and hook up the meter to it. Then you SLOWLY press down on the pedal for the accellerator. The meter should be set to read OHMS and have min/max recording enabled. You can also have someone sit and watch the meter. The meter should go from infinty to near 0 at full throttle. You are not running the motor during this test by the way. If the meter suddenly drops out to 0 or starts showing readings that are sponeous and not in linear progression to what you are doing, the TPS is bad.
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