Electrical Gremlin On My Back! HELP!!

I just unplugged all connectors on drivers side kick panel or whatever it's called and plugged them all back in...they all went back together good seemingly for whatever it's worth

 

Factory security/Immobilizer or whatever light doesn't blink when i remove key out of ignition like it used to if that has anything to do with anything

 

Did you ever check pin 12 of IC4 connector? (blue wire)
We need to see if we are getting power in to the connector, and out of the connector.

 

IC4 Connector Map Out


1. Blue/Black - Mag Clutch Relay
2. Black/Yellow - Power from ECM to STA Relay
3.
4. Black/Blue 10a Heater fuse
5. Yellow/Black - Ground to Fuel Pump Relay
6. Grey - To Alternator
7.
8.
9. White - Power from Air Fuel Relay
10. Red - 10A Dome fuse
11. Black - Power from EFI Relay
12. Blue - EFI fuse
13. Grey - Power to ECM from 10a ETCS Fuse.
14. Blue/Black - Wiper motor
15.
16. Blue/White - Wiper
17. Blue/Red - Wiper
18. Yellow/Green - 30A Defog Fuse
19. White - Ground Headlight Relay
20. Black/Yellow - 15A Turn/Haz Fuse
21. Purple - Power from 110v Relay
22. Head Hi Left
23. Head Hi Right
24. Light Green - 25A Heater
25. Black - 30A Tow Brake
26. Black/Yellow - Accelerator Pedal
27. White/Blue - 20A Radio #2
28. Blue/Yellow - 20A Radio #1
29. Light Green / Black - Accelerator Pedal
30. Grey - Power from Acc. Cut Relay
31. Red/Black - Accelerator Pedal
32. Orange - 7.5A OBD Fuse
33. Grey/Black - Ground from ECM to C/Open Relay
34. White/Red - Accelerator Pedal
35. White/Green - ECM power to EFI Relay (Control)
36. Black/Yellow - Power from Heater Relay
37. Blue - Ground to Heater Relay
38. Pink - 7.5A Acc Fuse
39. Grey - A/C Temp Sensor
40. Green/Yellow - 7.5A Heater Fuse
41. Blue - Ground for 110v Relay
42. Red/Black - Front Turn - Left
43. Brown/Yellow - Ground Mag Clutch Relay

 

Ran to grocery store will check soon as I get back home here directly
Pin 12 blue wire on IC4 correct?

 

Yes

 

Excuse the late response if you will everyone. Jus busy with work and frustrated with this truck issue.

I can't make out what pins are what on that dang "funky oblong" whatever IC4 connector. I do however have power on 2 pins there but no clue what # they are due to the awkward shape/layout of it but I don't think either of them are #12 but I could be completely mistaken on that.
I know this isn't much help to yall and apologize. Idk. Really missing my Fluke meter at this point. Sux not being able to test continuity

 

Pinout for that connector is in Post #50

I'd rather use a test light anyway.

 

Any idea what colors the wires are?
Just to give me something to "think about".
I always try to think ahead. That helps me put together a response "faster".

Below is the pinout.

 

UPDATE!

FWIW I do have power to EFI # 2 fuse now (key on)

Will get back with you on wire colors or pin #'s at IC4 connector that have power.

Continued gratitude for you guys.

 

Still no CEL tho of course at any point

 

That’s a start in the right direction.
Now see if you have power to E8 pins 1 , 2 and 3.

We still need to address the grounds. But let’s get power first.

 

E8 pins 1, 2 and 3 all go through IC4.
Pins 1 & 2 get power form the EFI No2 fuse. The only way the EFI No2 fuse can get power is if the ECM controls the EFI relay. And the control wire for the relay goes through the IC4.

Something you did worked.
Keep doing what ever your doing.

 

The EFI relay pin #2 (ground) was loose so I just twisted a wire around the corresponding terminal on the relay itself and ran it straight to ground is all I did...thereafter EFI #2 has power...if that makes sense.

Headed to check those E8 pins 1,2,3 now.

 

Ok lads n gents here is what I learned today...spoiler alert, it ain't good.

E8-1, E8-2, IC4-11 are straight up GROUNDED! How the .... is this even possible?

E8-8, E8-9 have power FWIW

@TnShooter

 

Grounded as in it's blowing the fuse or your checking with a meter?

If your checking with a meter or test light yes they will show a path to ground because the EFI Relay powers up alot of stuff.

 

As @Dm93 said, they will show a path to ground.
The easiest example would be “through a relay” on the control side.
But let’s not get off course. That’s a a discussion for a different time.

 

Did we ever figure out those 3 grounds that were missing? The PCM can't turn on the EFI relay or power up if it's missing grounds.

 

Not yet.

 

I posted the location. Looks like back side of passenger head.
Or possibly under back of intake.?