1st Gen OBD2 Communication Error

If I can please get a PDF link or photo to the data link connector , the OBD2 scanner is not getting a signal from ONE of the wires.
If anyone has a PDF copy of the color code for the wires and which pin they should be connected to that would really help me out , both my scan tools are giving me a communication error.

 

Assuming the 03 in your profile:

Pin 4 (White/Black) Chassis Ground
Pin 5 (Brown) Signal Ground
Pin 7 (White) SIL terminal (K-Line) (Communication/Data Line)
Pin 13 (Yellow/Black) TC Terminal (Used for certain diagnostic/reset procedures)
Pin 16 (Violet) Battery Power from OBD Fuse (7.5A)

 

Thank you so much ! You my friend are a life saver , I really appreciate this info !

 

Does anyone know the Data Link OBD2 protocol for the 1st Gen ? Is it ISO , KWE CAN ?

 

Sorry , let me rephrase that:
I meant to say that which protocol is used for the OBD2 scan diagnostics for the 1st Gen Tacomas ?
1. KWP2000
2. ISO9141-2
3. CAN BUS
4. ISO15765-4
5. ISO14230-4
I am trying to pinpoint which wire is NOT getting a signal when I put my scan tool onto the OBD2 port ?

The previous owner had CUT the OBD2 connector off , I was able to trace and locate all wires ( Thanks to Dm93 ) and I soldered a new connector. But , I am getting a connection error , unable to communicate with vehicle.

 

It's ISO9141 on early models but it changes on later ones

 

Thanks !


This is a generic image and not from a Tacoma as a reference.
Thanks again appreciate your information knowledge.

 

It communicates on Pin 7 which according to the standard OBDII connector layout should be ISO9141 also known as K-Line.

I belive it rests at 12v when it's not communicating but I'm not 100% on that.

 

Aaaahhhhhh ! That makes sense now !

 

Thanks !

 

I got a feeling it’s the WHITE wire
(pin 7) that is not making contact. When I get home from work I will double check the connections.

 

I have to trace pin 7 White wire to J11 connector , I think that is where it’s not making contact

 

I don't have 03 on my phone but here's for 02, I would think it would be in the same place.

 

This helps a lot ! Thanks again

 

Dm93 do you have the before and after page of this circuit in PDF ?

 

Srry been really busy this morning, I can look later.
What exactly are you looking for?

 

The D7 connector page