1968 Shelby GT500

4.6L harness

This page is about 1996-2004 Mustang 4.6L Air EFI systems.

If you would like to learn how to build your own EFI harness you will need to know:
How to Solder
What Wire Sizes to Use
How Relays Work
How the EEC Computer Connector Comes Apart
Then study the wiring diagrams, computer pin out charts, and assemble your own harness.

If you want to purchase a BRAND NEW EFI harness or buy parts for your harness project;
Please visit our PRODUCTS PAGE


PIN 1996-98 4.6L 1999-04 4.6L
1   Coil on Plug #6
2 MIL  
3   GND
13 DLC PWR pin 13 DLC PWR pin 13
15 DLC (-) pin 10 DLC (-) pin 10
16 DLC (+) pin 2 DLC (+) pin 2
21 Crank Sensor (+) Crank Sensor (+)
22 Crank Sensor (-) Crank Sensor (-)
23   L Knock Sensor (-) (DOHC only)
24 GND  
25 GND GND
26 Coil #1 (cyl 1 & 6) Coil on Plug #1
27   Coil on Plug #5
32 L Knock Sensor (DOHC only) R Knock Sensor (-) (DOHC only)
33 GND  
36 MAF RTN MAF RTN
38 ECT ECT
39 ACT ACT
40 FPM FPM
46 E-Fan High E-Fan High
48 Tach  
51 GND GND
52 Coil #2 (cyl 3 & 5) Coil on Plug #3
53   Coil on Plug #4
55 KAM PWR KAM PWR
57 R Knock Sensor (DOHC only) R Knock Sensor (+) (DOHC only)
58 VSS  
60 R HEGO R HEGO
68   VSS
71 PWR PWR
72 Injector #7 Injector #7
73 Injector #5 Injector #5
74 Injector #3 Injector #3
75 Injector #1 Injector #1
76 GND  
77 GND GND
78 Coil #3 (cyl 4 & 7) Coil on Plug #7
79   Coil on Plug #8
80 FP Relay FP Driver
83 IAB IAB
85 CAM Sensor CAM Sensor
87 L HEGO L HEGO
88 MAF MAF
89 TPS TPS
90 V-REF V-REF
91 SIG-RTN SIG-RTN
93 RF HEGO Heater GND RF HEGO Heater GND
94 LF HEGO Heater GND LF HEGO Heater GND
97 PWR PWR
98 Injector #8 Injector #8
99 Injector #6 Injector #6
100 Injector #4 Injector #4
101 Injector #2 Injector #2
102   L Knock Sensor (+) (DOHC only)
103 GND GND
104 Coil #4 (cyl 2 & 8 ) Coil on Plug #2

4.6L EFI Ingition Circuits:

4.6L EFI Harness Power circuit:

 
EFI Relay 1
EFI Relay 2
Fuel Pump Relay
Fan Relay
WOT Relay
Pin 30
Constant +12 Volts from Battery protected by Fuse
Pin 85
Ground Ground EEC Pin 80 EEC Pin 46 EEC Pin 69
Pin 86
+12 Volts from Ignition Switch (Hot in Run and Start)
Pin 87
EEC 71/97
Ck Engine Light
Fuel Injectors
Idle Air Bypass
Ignition Coils
MAF Sensor
HEGO Sensors
Alternator
Fuel Pump
FPM (EEC Pin 40)
Electric Fan
-
Pin 87a
-
A/C Compressor

Data Link Connector:

Automatic Transmission:

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