94 Celica GT, Fuel Injected, Man Trans
I have 6+/- sensors that are not receiving the correct voltage. Per specs, with the ignition on most sensors are supposed to receive 9-14 Volts while some are supposed to receive 3-5 Volts. However, the sensors I am reffering to are all receiving millivolts (less than .1 Volt). Some of the sensors include:
-EGR VSV
-ISCV
-TPS
-MAP
-Terminals T1 and T2 of the check connector
All other sensors outside of these few are receiving the correct voltage. Also, the computer (ECM) is brand new. If you have experienced this before, please advise where to begin. I have been to the Toyota dealership twice to no avail as well as two individual mechanics. Any help or starting place that you can offer will be greatly appreciated.
2007-08-21 06:20:26 · 6 answers · asked by Anonymous in Cars & Transportation ➔ Maintenance & Repairs
Also, the computer was changed becuase of this electrical problem.
2007-08-21 06:37:06 · update #1
First have you tried to actually use a scan tool to see what is doing what, usually you can come to a conclusion of what the problem is right off the bat by seeing if the problem is spiratic, my first guess would be a poor ground somewhere if the sensors themselves are getting low voltages esspecially this many at a time.
2007-08-21 06:42:54 · answer #1 · answered by silencetheevil8 6 · 0⤊ 0⤋
This is symptomatic of a bad ECm or the ECM was not installed properly, (connections or plug).
A measurement in millivolts can be taken from thin air when you move a wire though the Earth's magnetic field you will generate X millivolts. This indicates that there is no power going to the sensors you mentioned.
Good Luck!
2007-08-21 06:37:37 · answer #2 · answered by CactiJoe 7 · 0⤊ 0⤋
I had something similar in a Dodge Neon. As I'm not as proficient in this, I'd start by checking on the computer's output first (the voltaje going to the sensors) and then checking each line for misconnections. Most likely, the problem's a missconnection, unless you find your computer's output is failing. Otherwise the electrical harness might be faulty. Although you don't mention why the computer was changed. Luck!
2007-08-21 06:32:18 · answer #3 · answered by Ordisi 4 · 0⤊ 0⤋
Do you have the correct input voltages and grounds to the computer? Check the diagram and see if maybe a power input is shorted. Also the ECM maybe bad again.
2007-08-21 08:01:17 · answer #4 · answered by Airmech 5 · 0⤊ 0⤋
If you already replaced the ECM, then my guess is it's a bad wire or wires. Check your wire bundles to made sure there's no corrision or shorts.
2007-08-21 06:47:14 · answer #5 · answered by Gary V 4 · 0⤊ 0⤋
You either have bad wire or computer check output at computer if good then it's the wire if not the computer is bad new or not.
2007-08-21 06:29:34 · answer #6 · answered by James B 5 · 0⤊ 0⤋