Explorer OBD2 Harness Re-work

[EFI Guy]

Am I close? Lol

Yes, you've got it. Just remember that the grey/red changes to orange at the splice for the O2 sensors.

 

[Papa Turdly]

Ok, one more question now that I am back home and going to start back on my truck. Does the Ford computer need to recognize the inertia switch to make the fuel pump work? I am integrating this harness into a ‘99 Jeep Cherokee and am planning on using the Jeep factory relay center, which I don’t believe uses the inertia switch.

 

[garberz]

Ok, one more question now that I am back home and going to start back on my truck. Does the Ford computer need to recognize the inertia switch to make the fuel pump work? I am integrating this harness into a ‘99 Jeep Cherokee and am planning on using the Jeep factory relay center, which I don’t believe uses the inertia switch.

Nope, the PCM provides a ground signal to energize the fuel pump relay. Once the relay closes, the load is sent through the inertia switch then on to the fuel pump. The PCM only sends ground to the relay, it has no idea what the relay operates. This is when using our simplified harnesses.

Mark

 

[EFI Guy]

The inertia switch is just an inline switch between the relay and the pump. I recommend adding it in for safety reasons but the PCM doesn't need to see one. However, the PCM does monitor the fuel pump circuit for power, so the output of your relay should feed pin 40 as well as your pump.

 

[Rocko1012]

O2/wire

I believe i am on the right track for wire another from O2 Sensor
Pleas look at pictures and let me know. Do in splice into yellow and red from the other o2 sensor. Can I Delete other plugs in those pics. EGR Stuff

 

[EFI Guy]

The plugs in red are EGR. You don't splice into the other o2 on those colors though. They only share orange, and blue/orange.

 

[Rocko1012]

O2 Sensor

After sleeping on it, I have to say my last post was not to bright. I was not thinking of left and right side sensors. 2 separate circuits. I have to go back and ensure I did not remove wires completely from PCM. Used the above to get my 02's wired up correctly, Had to add wires back into PCM plug.
Thanks Gary for picture

Cut off trans plug from engine harness and removed all wires that were cut from pcm & C115. Will i need to do anything to engine harness, for High Idle/no A/c (41, 69, 86) off of C115

Ron

 

[bigmuddy]

Admin is there an award for selfless helping of fellow bronco travelers? If so, EFI guy deserves one for the information he has provided...

 

[onpier55]

Absolutely! I agree with you Bigmuddy.

 

[wsager]

Are the videos down, or is there something wrong with my computer and phone?

 

[TTownEP]

Are the videos down, or is there something wrong with my computer and phone?

The links are broken, but the videos are still up on YouTube.

 

[wsager]

The links are broken, but the videos are still up on YouTube.

Awesome, thank you!

 

[EFI Guy]

The videos are still there, it's some sort of problem with mixed content being blocked on HTTPS sites by both Chrome and Firefox and possibly others. The quick fix is to just enable it in the browser for the webpage you are on if it's trusted.

 

[wsager]

Thanks Gary, I'll check that out.

 

[78cumminscrew]

Sent you a pm. Interested in a harness and ecm flash.

 

[Stefan]

Looks challenging for people that are partially colorblind like myself. I am trying to figure out how to fit the AC in the classic bronco.

 

[ngsd]

Sent PM, still doing these?

 

[Joker11]

I may have asked this before so I apologize.

If I have a complete explorer as a donor, and I transfer everything over to the bronco, why do I need to modify the harness?

 

[904Bronco]

I may have asked this before so I apologize.

If I have a complete explorer as a donor, and I transfer everything over to the bronco, why do I need to modify the harness?

Because not everyone wants to keep all the smog equipment, then there is the fuel evap circuit that briefly pressurizes the fuel tank looking for leaks, I am a little slow this morning, so I don't have the name, but there is also a key security system that needs to be disabled on the later models...

 

[ngsd]

Airbags, rollover, alarm, ignition, seat/seat belt sensors, smog, and more. Why would you want to transfer all of this to an EB?