I did my research and having trouble with the wiring diagram on installing the PLX500. has anyone installed this wideband unit through their power FC? if anyone has some details it would be really appreciated.

 

I have the R300 with PFC & Datalogit. What are you having trouble with?

 

http://www.plxdevices.com/ECUDatabas..._RX7_93_95.pdf

the diagram in this pic that i attached and the link of the ecu pin-out where does each the wire goes? do you have a detailed wiring diagram on how you installed your r300? is should be the same pin-outs as the powerFC right? when i bought the car from the previous owner, the PFC was already installed and no instruction manual/ wiring manual from the PFC included when i bought the car. im having trouble of looking for the PFC wiring diagram so im trying to use the stock ECU pin-outs but i might damage something, so before i do that i just wanted to make sure if anyone can help me out on the wiring of the r500 to the powerFC. thanks for replying.

note: Ive also included this link from the plx devices on R500.
http://www.plxdevices.com/products/r500/

 

you need the datalogit to run a wideband with the power fc.

EDIT: You dont need to access any of the ecu wiring to wire in a wideband. If you want to be able to log and tune with the power fc and a wideband you will need the dataloggit as i originally posted. If you just want to wire the wideband up to monitor your AFR's that can be done.

I am not familiar with the PLX 500 specfically but im sure most wideband controllers are the same. The power FC wiring is the same as the stock ECU. they use the same wires.

I noticed that the PLX 500 accepts a knock signal, which you would need to tie into the ECU harness for that. the speed inputs can be either RPMs or actual speed which are showin on the ECU pinout, im guessing the PLX 500 has additional features im unfamiliar with, and for those maybe you need to wire into the ECU wiring. The map sensor would be an analog input.

im sure you can figure out 12 v and ground. 12v should be a switched source with the ignition key on. you can get the from the ecu or several other places your choice.
Im guessing the PLX 500 display shows the afr without needing to run an input from the controller to the display. The afr output would go to the dataloggit if you had that, or some other form of datalogger/external display, the EGT probe is self explanatory, the EGT output could also go to the datalogger or external logger/display as well.

It looks like you would be able to use the PLX for a type of datalogger, but really the dataloggit is a much better way to go. The ECU pinout you have will work just fine to get it connected, just follow the pins and decide what inputs you want to monitor.

if its just EGT and A/F you dont need to mess with the ecu wiring at all.

 

+1 to that post.

I don't have a wiring diagram for my install, but the basic setup is easy. The most difficult part of the job was working upside-down in the footwells.

I tapped a fused lead into the extra switched +12V port in the driver's-side fuse box. Ground wires connect the PFC, DL & R300 to minimize voltage offsets.

NB output can run to the stock O2 sensor wiring. I'm not using closed-loop on the PFC, so I have not bothered with this.

You can use the PLX's extra inputs for TPS, RPM, etc. by tapping into the appropriate harness wire and configuring the R500 as needed.

WB output is useless with the PFC unless you have a DL. If you're going to use the R500 to log, you'll definitely want to connect RPM & MAP to the PLX.

 

I dont have a DL as of now but will purchase one in the future when the budget is good. right now i just wanted to monitor my AFR's and EGT readings to avoid detonation. I really appriciate your replies guys, i am now in the process of installing the unit and probably wiring later. thanks again for a great input.

 

i found another diagram when i was searching for color codes on the harness of the R500 and here they are:

R-500 Connection Diagram
Main Harness Wire Colors
+12V – Red (18 gauge)
GND – Black (18 gauge)
Speed 1 – Brown/Black
Speed 2 – Orange
Analog 1 – Red/Black
Analog2 – Orange/Black
Analog3 – Purple
Analog 4 – Blue
AFR Configurable Output – Light Green
AFR M-Series Linear Wideband Output – White
Knock Raw Analog Output – Yellow
EGT Analog Output – Sky Blue
AFR M-Series Narrowband 0-1V - Gray
Knock Input – Pink
Audible Knock Output – Audio connector
Thermal Coupler Wire Colors
+CH - Yellow
-AL - Red/Yellow

what confuses me is on the main AFR wiring, do i need to tap the lightgreen wire which is AFR CONFIGURABLE OUTPUT to the primary O2 sensor which is on the ECU pinout diagram (3C) on the connector 2 of the ECU pinout diagram? or do I tap the white wire which is the M-SERIES LINEAR WIDEBAND OUTPUT on the 3C?

I would also like to monitor my tachometer output signal and vehicle speed sensor signal i understand there is 2 speed lines on the R500 harness which is color coded brown/black for speed1 and orange for speed2?

I will also tap the knock input which is color coded pink to the ECU pinout connector 3 (3M) for knock readings.

again thanks for helping me out guys.

john

 

NVM guys i figured out the wiring, simply commonsense got it working good, ill just purchase a datalogger in the future. thanks alot again.