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Discussion Starter · #1 · (Edited)
Hello guys. So I bought my car with a random orange wire that has been snipped and leads to nowhere. I traced it all the way back to the computer through the looming and realized it is the HEGO ground. Can this be grounded anywhere or is there a specific spot for it? Also I have 2 random green ground wires that attach to the firewall behind the intake. Any idea where these might go? Thanks guys.
171515
171516
171520
 

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Those green ones don't look factory nor have I ever seen a yellow pcm cap. The only orange wire on mine is for the tps, the hegoes use 4 different color wires, I think all black, grey and white.
 

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Charlie don't surf..
'92 Ford Bronco XLT
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definitely doesn't look like a 60 pin connector..need to post up the details about your rig in your profile..year, engine/tranny combo and so forth..I seem to recall there being an orange ground for the Hego on the pre-'90s Broncos that was somewhere near the firewall, but I don't remember for sure..if it is a ground, no reason you couldn't just ground it to another suitable location.
 

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2014 Ford Explorer Sport
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I believe the OP's Bronco is a 1988 model year with a 5.8L engine. I have never seen a yellow capped PCM connector either, but the wires do line up to several of the diagrams I have. Pin 49 (HEGO Ground) is an Orange wire that goes to ground G711, listed as located on the left hand rear of the engine. The green leads the OP posted on the firewall are a mystery to me.
 
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Yo Jc,



EEC IV 60 Pin Connector Pin Diagram by Ryan M

EEC IV Connector Pin LEGEND by Ryan;


Computer Pin outs
Year:
[URL='https://www.fullsizebronco.com/javascript%3Ana_open_window('win',%20'/files/EFI_harness5.gif',%200,%200,%20650,%20850,%200,%200,%201,%201,%201)']87-95
94-95
89-95
89-95
89-95
Engine:
300
300
460
Vehicle:
Truck Van Bronco
Truck Van Bronco
Truck Van Bronco
Truck Van Bronco
Type:
Mass Air
Speed Density​
Mass Air
ALL
Injector:
14lb/Hr
14lb/Hr
19lb/Hr
19lb/Hr
19lb/Hr
24lb/Hr
1
K A PWR​
K A PWR​
K A PWR​
K A PWR​
K A PWR​
K A PWR​
2
BOO​
BOO​
BOO​
3
VSS (+)​
VSS (+)​
VSS (+)​
VSS (+)​
VSS (+)​
VSS (+)​
VSS (+)​
VSS (+)​
4
IDM​
IDM​
IDM​
IDM​
IDM​
IDM​
5
TSS (+)​
6
VSS (-)​
VSS (-)​
VSS (-)​
VSS (-)​
VSS (-)​
VSS (-)​
VSS (-)​
VSS (-)​
7
ECT​
ECT​
ECT​
ECT​
ECT​
ECT​
8
FPM 89-95​
FPM​
FPM 89-95​
FPM​
FPM​
9
Data Bus (-) 90-95​
MAF-RTN​
Data Bus (-) 90-95​
MAF-RTN​
Data Bus (-) 90-95​
10
A/C on​
A/C on​
A/C on​
A/C on​
A/C on​
A/C on​
11
TAD​
TAD​
TAD​
TAD​
CANP​
TAD​
12
INJ 6​
INJ 6​
4LOW input​
13
INJ 7​
14
INJ 8​
15
INJ 5​
INJ 5​
16
IGN-GND​
IGN-GND​
IGN-GND​
IGN-GND​
IGN-GND​
IGN-GND​
17
STO​
STO​
STO​
STO​
STO​
STO​
18
Data Bus (+)​
Data Bus (+)​
19
Data Bus (-)​
Data Bus (-)​
SS2​
20
GND​
GND​
GND​
GND​
GND​
GND​
21
IAB​
IAB​
IAB​
IAB​
IAB​
IAB​
22
FPR​
FPR​
FPR​
FPR​
FPR​
FPR​
23
KS​
KS​
KS​
KS 302 only
KS 302 only
24
PSPS 87-90
PSPS 302 only
25
ACT​
ACT​
ACT​
ACT​
ACT​
ACT​
26
V-REF​
V-REF​
V-REF​
V-REF​
V-REF​
V-REF​
27
EVP​
EVP​
EGR solenoid​
EVP​
EVP​
EVP​
28
Data Bus (+) 90-95
Data Bus (+) 91-95
Data Bus (+) 91-95
29
HEGO​
HEGO​
HEGO​
HEGO​
TSS(-)​
30
NDS​
NDS​
NDS​
NDS​
NDS​
NDS​
MLPS​
MLPS​
MLPS​
31
CANP 90-95
TAB​
CANP​
TAB​
CANP​
32
OD light​
OD light​
OD light​
33
EVR​
EVR​
EVR​
EVR​
EVR​
EVR​
34
TAD​
TAD​
35
INJ 4​
INJ 4​
36
SPOUT​
SPOUT​
SPOUT​
SPOUT​
SPOUT​
SPOUT​
37
V-PWR​
V-PWR​
V-PWR​
V-PWR​
V-PWR​
V-PWR​
38
EPC​
EPC​
EPC​
39
INJ 3​
INJ 3​
40
GND​
GND​
GND​
GND​
GND​
GND​
41
OD switch​
OD switch​
OD switch​
42
TOT​
4LOW input​
4LOW input​
43
A/C demand​
44
HEGO​
HEGO​
45
MAP​
MAP​
MAP​
MAP​
46
SIG-RTN​
SIG-RTN​
SIG-RTN​
SIG-RTN​
SIG-RTN​
SIG-RTN​
47
TPS​
TPS​
TPS​
TPS​
TPS​
TPS​
48
STI​
STI​
STI​
STI​
STI​
STI​
49
HEGO GND​
HEGO GND​
HEGO GND​
HEGO GND​
TOT​
TOT​
50
MAF​
MAF​
51
TAB​
TAB​
TAB​
TAB​
SS1​
SS1​
52
EGR solenoid​
SS1​
SS2​
SS2​
53
TCC​
TCC​
TCC​
54
A/C WOT off​
55
CSS​
CSS​
56
PIP​
PIP​
PIP​
PIP​
PIP​
PIP​
57
V-PWR​
V-PWR​
V-PWR​
V-PWR​
V-PWR​
V-PWR​
58
INJ's 135​
INJ 1​
INJ's 1458​
INJ's 1458​
INJ 1​
INJ's 1458​
59
INJ's 246​
INJ 2​
INJ's 2367​
INJ's 2367​
INJ 2​
INJ's 2367​
60
GND​
GND​
GND​
GND​
GND​
GND​
Need Help with the Abbreviations, go here: Definitions & Abbreviations
[/URL]
 
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Discussion Starter · #6 ·
Thanks everyone. Can anyone tell me how to remove a single wire from the PCM?? I want to replace the orange wire to make it longer to reach the ground but can’t seem to figure out how to get it to release. Also just wanna confirm, 57,36 and 16 all get connected together to the 20 ground right? Thanks.
 

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Thanks everyone. Can anyone tell me how to remove a single wire from the PCM?? I want to replace the orange wire to make it longer to reach the ground but can’t seem to figure out how to get it to release.
How the EEC-IV Computer Connector Comes Apart


Also just wanna confirm, 57,36 and 16 all get connected together to the 20 ground right? Thanks.
Pin 20 and Pin 16 are tied together internal to the computer (PCM/EEC/ECM). Pin 36 and Pin 57 are not ground circuits.
 
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It's easier to splice the wire. You need a small pic, bend a small plastic tang back slightly to pull the wire, then you will have to crimp a new connector on a new wire.
 

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thank u so much For the computer diagram. Sorry I meant to say 56 not 57. The wires that go to the tfi module that have the circle around them in the diagram.
Pin 56 is the PIP signal to the computer. It is not grounded either. The "circle" around the wires between the TFI module and the computer denotes those wires are shielded. Meaning they are in a bundle that also has a foil sheath wrapped around them. One end of the shield is grounded.
 
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