OBD1 FZJ80 93/94 O2 Sensor wiring color

[SKULLGRINDER]

Both my EWD and FSM make it unclear what color wires ( harness side ) match up with the colors on the OEM sensor side ( 4 wires; red,blue,white,gray) Nor can I find NTK literature designating each color wire on the sensor side for heater heater signal and ground. Can someone provide me a photo of a factory harness plug and the wires in each associated number pin out? I recently replaced my sensors with new OEM and relocated to my manifold and now have a code 21&28 something I haven’t had before. Anything helps thanks

 

[Fj80oregon]

Isn’t the pin out in the OEM EWD?

 

[SKULLGRINDER]

Isn’t the pin out in the OEM EWD?

correct pin out for harness side. I am trying to figure out what each color wire on the sensor side indicates so I can confirm my pin out is going to the correct male end

 

[jonheld]

 

[SKULLGRINDER]

View attachment 4164589
View attachment 4164591

appreciate this. this is how I have everything hooked up and yet still have 21&28 codes. Ive triple checked this now. Tested sensors both have good OHM

 

[jonheld]

appreciate this. this is how I have everything hooked up and yet still have 21&28 codes. Ive triple checked this now. Tested sensors both have good OHM

Verify that pins 1, 3, and 4 on both O2 sensors are getting to the proper pins on the ECU according to the schematic.
Verify that pin 2 on both sensors are getting +12.

Pull the 15 amp EFI MAIN fuse out of the relay box on the left fender and allow the ECU to reset and clear all codes. Takes about 5 or 10 minutes.

 

[SKULLGRINDER]

2 ( yellow red) 12V + [ battery power ]
1 ( gray) .007V - [ ground ]
3 (blue white) .75V [ heater circuit ]
4 ( black yellow) 1V [ heater circuit ]

 

[jonheld]

2 ( yellow red) 12V + [ battery power ]
1 ( gray) .007V - [ ground ]
3 (blue white) .75V [ heater circuit ]
4 ( black yellow) 1V [ heater circuit ]

You should be checking continuity from each O2 sensor to the pins on the ECU for pins 1, 3, and 4. Not voltage.
The idea is to make sure the correct pins from the O2 sensors are getting to the correct pins on the ECU according to the schematic. Checking voltage tells you nothing.