reesezrex

ok so im tracking down these gremlins. i have a code for iat, vss, and tps. my car has a very high idle. also wont rev past 5k most of the time. no fast idle control valve or egr but brand new iacv.

i started with tps. ohms tested and had a dead spot and unstabke readings. have 5 volts reference. then tested vss and no reading while spinning tires on jack stands. then tested iat and the sensor was reading 3.5k ohms but no voltage to connector. yes i checked for voltage koeo.

my questions are what will a bad vss cause, bad tps cause, and iat probably thinks its unplugged but what will it do. i also sprayed for vacuum leaks and checked all my hoses.

also i just looked up the sensor testing thread on here that i have book marked for s&g and my tps has green/white wire and map sensor has green blue. what will switching these cause?

btw for thos who dont know this is a 90 crx si with obd1 h22a

yes i searched and dont have a definiteive answer from experience on all .

thanks in advance.

reesezrex

did i forget to say please?

reesezrex

nobody?

turbohatch96y7

iTrader: (15)

Check for input voltage to all sensors and a ground first then out put voltage I don't have my helms but ill help when I get home. Iat and tps should have 5 volts check for breaks in the harness back to the ecu.

turbohatch96y7

iTrader: (15)

And your iat readings sound really high that sensor may be worn.

turbohatch96y7

iTrader: (15)

If you can takke the dead end connector plugs off and check for voltage there at the yellow blk wires for 12v and the blk green sensor voltage for 5 volts. And test continuity from the blk to youur ground. If there's a problem there you can start taking apart your harness and look for breaks. These older harness wires break easily.

reesezrex

the tps has reference voltage, the iat does not. but i think the tps has been switched due to wire colors. looks like the map and tps are switched per this link....
https://honda-tech.com/forums/tech-misc-15/honda-sensors-resistance-chart-anyone-has-1817082/