quick question. what powers the 3J pin at the ecu of an s4 N/A?

 

Stop making countless threads about the same thing. Do you understand?

 

wow dude sorry i just need so help on this. it really stresses me cuz i really need my car running or else the city will tow it away.

 

According to the FSM, the 3J pin is a constant 12V from the battery.

http://i46.tinypic.com/20zrwgz.png

 

Does it not say in the FSM in the pinouts listed? The Room fuse powers this wire. If you have 0 volts then perhaps the Room fuse is blown or the connector FEM-02 is not makiing a good connection.

 

After messing w/the AFM and appearing everything is okay you need to recheck the voltage on the pins mentioned before to see if they are within spec or not.

 

okay sounds good. ill go out there in a few when it gets cooler here in Los Angeles

 

Gets cooler? Its 80 degrees there! Damn, dont come to Texas boy, yeeeehaw!

 

i love texas. i stayed in san antonio for a bit

 

just rechecked it and here are my findings.

1M-.93V
1N-.66V
1P-.66V
1Q-.66V
1T-.66V
1U-4.32V
1V-.01V
1X-0

2B-3.52V
2C-0V BUT RESISTANCE .486???
2D-.08V
2E-3.97V
2F-3.11V
2G-.82V
2H-3.94V
2I-1.45V
2J-1.65V
2L-3.52V
2R-0V RESISTANCE .473????

3A-0V RESISTANCE .487???
3B-1.66V
3C-11.55V
3D-0V ?????
3E-11.45V
3F-11.45V
3G-0V RESISTANCE .497????
3H-11.44V
3I-11.44V
3J- 0V STILL??????

 

The numbers you provided earlier that were wonky are all pretty much in line w/the spec numbers so the wiring/connection to the AFM was likely the cause. If the Room fuse is good then the interior courtesy lights would work such as the spot light located by the rear view mirror. If they work then you need to check the connection at FEM-02. On one side of the connector lies a White/Blue wire and on the other side it mates w/the Blue/Red wire. If the Blue/Red wire has voltage and the W/L does not then there is a poor connection going on.

 

what do you think might have caused the voltage increase on those other pins?

 

Perhaps the wiring to the AFM shorting out against something.

 

will check on it

 

...your TPS is out of adjustment and your battery is weak as *****, it also wouldnt hurt to reground the ECU

 

thank you. im gonna go ahead and do that

 

The engine needs to be as warmed up as possible before setting your TPS. The numbers you provided that were close to spec indicates that your engine was not as warm as it can be thus you cannot use the readings you provided as a cause for having to set your TPS. The TPS pin would read 1 volt w/key to on and the engine completely warmed. Your Water Thermosensor reading would be close to .5 volts w/key to on if your engine was completely warmed up and you didn't have that reading when you posted the updated numbers thus your car was not at an operating temp to cause one to think their TPS was out of spec.

 

^my bad, my TB is stripped of the thermo wax assembly, therefore i set my TPS whenever...usually when it will voluntarily hold a normal idle. Pin 1U does seem kinda jacked up tho, it should be more like 1V and 1X (assuming voltages are taken at KOEO)... but still, there should be batt voltage at 3J during key on

 

The FSM wiring diagram indicates that pin 3J should be fed by the Room fuse so it could easily be a blown fuse that is causing no voltage to be found at that pin.

 

i double checked the room fuse and its good. but still no power to 3J so does that mean there is a break in the wire?

 

You were told to look at FEM-02 if the fuse was good and what to look for.