1G Sourcing the MAF idle position switch

[slow4dr]

The GVR4 has two green/yellow wires that run to the MAF. My Maf plug is cut off so I need to figure out which Green/yellow wire is which. The #1 & #7 wire from the 1G plug from the Vfaq are the wires I am referencing. The #1(green/white on the T/E/L) wire is the idle position switch. The #7(green/yellow on the T/E/L) is barometric pressure.

How can I tell these two wires apart with a voltage tester?

TIA Jason

 

[BOOstGhost]

i know this is off topic but are you the guy selling the galant on SRTforums?? I have a friend that might be interested for the right price!

 

[slow4dr]

Yep, That is me unfortunately. At present time it is spoken for. If this deal were to fall through I would post it for sale here.

 

[steve]

The GVR4 has two green/yellow wires that run to the MAF. My Maf plug is cut off so I need to figure out which Green/yellow wire is which. The #1 & #7 wire from the 1G plug from the Vfaq are the wires I am referencing. The #1(green/white on the T/E/L) wire is the idle position switch. The #7(green/yellow on the T/E/L) is barometric pressure.

How can I tell these two wires apart with a voltage tester?

TIA Jason

There is no Idle Position Switch wire to the MAF, There is a MAF reset line on pin 1.
The GVR4 circuit diagram I have, is clearly wrong because it shows two pin 1s, both with Green w/Blue wires running to them.

The quickest way to test would be to disconnect the ECU and jumper one of the two questionable wires to ground and then measure continuity to ground in the engine bay.

Steve

 

[slow4dr]

green/yellow and green/white on the T/E/L are the ones I am after. I was hoping someone could just check voltage while key/on engine off and key on and engine/on on the the two mentioned wires. As long as there is a difference of voltage I am golden. Yes, I am lazy and I dont feel like pulling the ECU.

 

[steve]

I was hoping someone could just check voltage while key/on engine off and key on and engine/on on the the two mentioned wires. As long as there is a difference of voltage I am golden.

I don't think there is a difference but I'll check when I power up the next ECU on the bench.

Steve

 

[steve]

How can I tell these two wires apart with a voltage tester?

I just powered up a '90 ECU to check since that was on the bench right now.

The MAF reset line is pulled up to 5v by the ECU. (The IPS line in contrast is pulled up to battery voltage) The Baro sensor line was low without the MAF plugged in.

Steve

 

[slow4dr]

I just powered up a '90 ECU to check since that was on the bench right now.

The MAF reset line is pulled up to 5v by the ECU. (The IPS line in contrast is pulled up to battery voltage) The Baro sensor line was low without the MAF plugged in.

Steve

Thank you sir. I will confirm it once I get home. BAH!!!!! Friday night so-cal traffic.

 

[slow4dr]

Thanks again Steve! Open wastegate jaunts through the neighborhood last night.