AFM question
06-18-2006, 06:26 AM
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AFM question
I'm trying to troubleshoot my 22re, I am looking at the AFM now, everything checks out ok with an ohmmeter but I'm wondering about the resistence between two of the terminals. E2-Vs the resistance should be 20-400 closed, and 20-1000 fully open. the open reading should increase with the amount the throttle opens. mine starts to rise as I open the throttle and rises up to about 2-3rds of the way open then falls all the way back to 300ohms when fully open. Is this part faulty?
06-18-2006, 06:14 PM
#3
if your checking an electrical item dont get to hung up on ohm readings. i would consintrate more on checking the actual voltages to each circuit that will give you a better idea of whats going on. ohm readings can read good and the part still be bad. it happens all the time!!!!
06-18-2006, 07:53 PM
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its a 87 22re 4runner, it sputters really bad when warm and under a load. I can find alot of posts with similar problems but no solutions, I can't seem to figure it out. What should I check for voltage, to make sure it is working properly?
06-18-2006, 08:40 PM
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If you have a factory service manual, you can back probe the computer with the ignition on and test for voltages. I've got an 84 FSM, so I don't think it would be a good comparison. I'm sure 87 is a different setup altogether.
06-19-2006, 05:56 AM
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I've got a service manual from my 85', the ohm numbers look the same, so I measured the volts how the manuals says and some of the AFM volts are low. could someone verify if the 85' and 87' 22re should be the same?
06-19-2006, 06:17 AM
#7
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Originally Posted by mr toytech
if your checking an electrical item dont get to hung up on ohm readings. i would consintrate more on checking the actual voltages to each circuit that will give you a better idea of whats going on. ohm readings can read good and the part still be bad. it happens all the time!!!!
AGREED!! This happens all the time with the OPS (oil pressure sensor) on the chevy 6.5L turbo diesel. Basically the contact become corroded and can only carry a small amount of current. When you test with your DMM almost no current is flowing and as such it appears normal, but when you place a load across those terminals they suddenly cannot transfer the necessary current needed.
This is why the OPS in my truck now will supply 13.8v when the lift pump is unplugged, but the moment I plug in the lift pump the OPS will only supply 7.8v to the lift pump! (Someone remind me to kick someone in the balls at chevy or detriot diesel...)
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