checking resistance
04-12-2007, 10:35 AM
#1
checking resistance
i just got a sr20det fsm and it said how to check sensors and all that **** it said my coil packs should have 1ohm resistance, my injectors should have 10-14ohms and my o2 sensor should have 3-1000 ohms. i checked them all with an electrical tester and they all had 0 resistance is that good or bad. sorry about the newb *** question but ive never done this stuff before
04-12-2007, 07:18 PM
#4
1. are you sure you are measuring resistance ( 
)and not voltage.
2. also the tps has variable voltages.. make sure that you are hooking up to the right points bro.. carefully look through the fsm and they will tell you what points to probe.
there are so many variables such as loose contacts etc that affects voltage and resistance figures
Duran knows alot about the SR's he will chime in or pm him.
)and not voltage.2. also the tps has variable voltages.. make sure that you are hooking up to the right points bro.. carefully look through the fsm and they will tell you what points to probe.
there are so many variables such as loose contacts etc that affects voltage and resistance figures
Duran knows alot about the SR's he will chime in or pm him.
04-12-2007, 07:24 PM
#5
yea i was checkin that and it says wide open the tps should be at 5 and closed at 0.7 it went from 8 closed to about 13 open from wut this manual says i was doin the right thing do u think i should replaced the tps my idles jumpin fro 1k to like 2.3k
04-13-2007, 07:52 AM
#8
theres alot that matters, but im not so sure you have a problem first off. dont worry about checking Ohms on all these sensors. SR's can be fixed using very little technique, and alot of just common sense.
your tps sensor should have 3 wires (if its a manual TPS).
the green/red wire should be your 5v source
the white wire is signal
the black wire is ground
check voltage between the white wire and the black wire. key on, motor OFF. withouth touching the throttle wheel, the voltage should read at about
.45v and at wide open throttle be above 4.0v
On SR's, typically, coilpacks dont get weak, they just go bad. they split, crack, and ooze goo everywhere. i would say that if your car is running on all four cylinders, then your coilpacks are fine.
If you have an idling problem, remove the hose that goes from the intercooler pipe to right above the throttle body (big fat hose). put vacuum caps over both left over ports. now where the throttle wheel is (throttle cable attaches to it) there is a little screw that provides a stop for the wheel. loosen the lock nut and turn the screw about 2 full turns to raise the throttle wheel. this should be a good starting point. start the engine and adjust that screw until you get to your desired idle speed. tighten back down the lock nut.
SR IACV's go bad. they get dirty. people 'F' up the wiring to them and they dont work properly. the best way to deal with them is to bypass them in the manner i listed above.
your tps sensor should have 3 wires (if its a manual TPS).
the green/red wire should be your 5v source
the white wire is signal
the black wire is ground
check voltage between the white wire and the black wire. key on, motor OFF. withouth touching the throttle wheel, the voltage should read at about
.45v and at wide open throttle be above 4.0v
On SR's, typically, coilpacks dont get weak, they just go bad. they split, crack, and ooze goo everywhere. i would say that if your car is running on all four cylinders, then your coilpacks are fine.
If you have an idling problem, remove the hose that goes from the intercooler pipe to right above the throttle body (big fat hose). put vacuum caps over both left over ports. now where the throttle wheel is (throttle cable attaches to it) there is a little screw that provides a stop for the wheel. loosen the lock nut and turn the screw about 2 full turns to raise the throttle wheel. this should be a good starting point. start the engine and adjust that screw until you get to your desired idle speed. tighten back down the lock nut.
SR IACV's go bad. they get dirty. people 'F' up the wiring to them and they dont work properly. the best way to deal with them is to bypass them in the manner i listed above.
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