ECU wire taps/hooking up WB

[Calan]

I'm hooking up my Zeitronix WBO2.... can I just splice the controller signals into the wires at the ECU connectors, or will it cause some input loading or impedance problems at the ECU?

The wires I'm looking at tapping into are:

Pin 101: Ground
Pin 4: Stock O2 sensor (cut this and hook up the Zeitronix narrowband signal?)
Pin 15: EGR temp - Connecting WB signal out to this, to use with MMCd for logging WBO2 through it's EGRT input.
Pin 19: TPS
Pin 21: CAS (RPM) - is this a correct place to tap RPM?

I'd like to tap into switched ignition power here as well (since I'm already tapping wires), but I can't see a switched 12v ignition pin on the ECU diagram. Is there one? If not, I'll just run off the fusebox.

Thanks for any help....

 

[freshlane]

For Engine RPM, Ground and switched 12v I would use the pins used for the SAFC ( http://www.apexi-usa.com/pdfInstallation/4.pdf )-use diagram m4

I used the diagram for my safc and never had problems.

 

[Calan]

I have the 1G ECU pinout diagram... but which is the ignition only 12v?

Pin 103: "Battery backup"
Pin 102: "Power Supply"
Pin 110: "Ignition switch - 1G" (12v supply or some sensor level saying the ignition is on?)
Pin 108: "Ignition switch - ST" (What is ST?)

I just need to know which pin of the ECU sees constant 12vdc only when the ignition is on.

 

[selmerguy]

I am to lazy to look up pin numbers tonight but use the power wire for the safc install. There is a good pis of the connector and everything. It also shows tps and rpm wires too. Good luck.
http://www.vfaq.com/index-main.html

 

[Calan]

Ummm.. don't see the SAFC install on the vfaq Selmer... which cat/title is it under?

Thanks

 

[steve]

Pin 101 (and 106) is ground.
Pin 102 (and 107) is the MPI power circuit. It gets 12v when the ignition is turned on.
Pin 103 is backup power. It's on all the time to maintain the setting in the radio and ECU.
Pin 108 is the signal from the ignition switch START position.
Pin 110 is the signal from the ignition switch START and RUN positions.

Steve

 

[Calan]

Pin 101 (and 106) is ground.
Pin 102 (and 107) is the MPI power circuit. It gets 12v when the ignition is turned on.
Pin 103 is backup power. It's on all the time to maintain the setting in the radio and ECU.
Pin 108 is the signal from the ignition switch START position.
Pin 110 is the signal from the ignition switch START and RUN positions.

Steve

Thanks Steve... so I guess powering the WB from 102 or 107 would work just fine?

 

[steve]

I guess powering the WB from 102 or 107 would work just fine?

Yes.

Steve

 

[Calan]

Cool beans... thanks

BTW - what does "MPI" stand for?

 

[steve]

Multi-Point fuel Injection

 

[Calan]

ahhh....

Do you happen to know if the RPM and TPS signals at the ECU will work as the inputs to the WB? I'm guessing it's just somehwat linear voltages sitting there, so it seems like it should work as expected... but ya never know.

I wish the Zeitronix instructions were a bit more detailed.

 

[steve]

I don't know jack about the Zeitronix. The signal from the CAS is a 5v square wave pulled high by the ECU and low by the CAS. The TPS is a 0-5v analog voltage.

 

[Jiggalude]

Ok, so looking at this diagram from vfaq.com Finding the O2 Sensor Wire what do I have to do specifically. Do I just tap the white wire into this one and then plug it back into the ECU?