Firewall Routing
There are two groups of wires which can be ganged and routed as one wire for rewiring purposes. The +12V supply wires to ECM Terminals B-1 and C-16 can be routed as one wire from Fuse #1. The wires from terminals A-12, D-1, D-3, D-6 and D-10, can be routed as one wire to a secure engine ground, (we strongly recommend attaching this common ground wire directly to the engine block, or cylinder head, to eliminate any possibility of a voltage drop in the ground connection.). The wires which must be run through the firewall are listed below by ECM terminal location, colour code, circuit number, and application with any additional information that may be necessary. As previously mentioned, there may be some variation in the colour codes involved in some of the circuits, depending on model and year.
Table 6 - Harness Wiring - Firewall
|
ecm
|
color
|
circuit
|
description
|
remarks
|
|
C-14
|
Gray
|
416
|
+5 volt reference signal
|
|
|
C-13
|
Dark Blue
|
417
|
TPS signal TPS Conn.
|
|
|
D-2
|
Black
|
452
|
+5 volt ground return Connector
|
|
|
C-1 0
|
Yellow
|
410
|
Coolant temperature signal
|
|
|
C-12
|
Tan
|
472
|
MAT sensor signal
|
|
|
D-4
|
White
|
423
|
EST
|
To 4-wire HEI distributor plug
|
|
B-5
|
Purple/White
|
430
|
Reference
|
|
|
D-5
|
Tan/Black
|
424
|
Bypass
|
|
|
B-3
|
Black/Red
|
453
|
ground
|
|
|
c-3
|
Lt.Green/black
|
444
|
IAC coil B lo
|
To IAC connector
|
|
C-4
|
Lt.Green/White
|
443
|
IAC coil B Hi
|
|
|
C-5
|
Lt.Blue/White
|
441
|
IAC coil A Hi
|
|
|
C-6
|
Lt.Blue/black
|
442
|
IAC coil A lo
|
|
|
D-15
|
Light Blue or Black/Pink
|
467
|
1-3-5-7 injector drive
|
|
|
D-16
|
Light Green or black/green
|
468
|
2-4-6-8 injector drive
|
|
| |
Pink/Black (+12V from Fuse #4)
|
639
|
1-3-5-7 injector power
|
|
| |
Pink/Black (+1 2V from Fuse #5)
|
839
|
2-4-6-8 injector power
|
|
|
D-7
|
Purple
|
412
|
Oxygen sensor signal
|
|
|
A-11
|
Black or Black/Pink
|
452
|
Analog ground
|
|
Table 7: Wire Harness for MAF Sensor, MAF Burnoff Relay, MAF Burnoff Control Relay
|
ecm
|
colour
|
circuit
|
description
|
remarks
|
|
B-12
|
Dark Green
|
998
|
MAF signal input
|
|
|
D-12
|
Black
|
900
|
Burn-off control (from MAF Sensor Burnoff Relay)
|
|
| |
Red or Purple
|
993
|
Runs from terminal A ( design 1) or E (design 2) of MAF power relay to term sensor E of MAF sensor
|
|
| |
Dark Blue
|
994
|
Runs from terminal A (design 1) or E (design 2) of MAF Burn-off relay and term. D (design 1) or C (design 2) of MAF Power relay to term. D of MAF sensor.
|
|
|
B-1
|
Orange
|
340
|
+12V supply from
battery via Fuse #1
|
|
|
C-16
|
Orange
|
340
|
|
|
|
A-12
|
Black/White
|
450
|
power ground
power ground
8 cyl select
o2 sensor low
ecm ground
|
c
o
m
m
o
n
g
n
d
|
|
D-1
|
Black/White
|
450
|
|
|
|
D-3
|
Black/White
|
450
|
|
|
|
D-6
|
Tan
|
413
|
|
|
|
D-10
|
Black/White
|
450
|
|
|
|
B-8
|
Green or Green/Yellow
|
59
|
AC signal - should be spliced into AC Comp. +12V supply wire
|
|
|
C-1
|
Dark Grn/White
|
335
|
Must be included if cooling fan relay control is desired.
|
|
|
b-2
|
Tan/White or red
|
120
|
To oil pressure activated
fuel pump back-up switch
|
|
| |
Blue or White
|
496
|
Knock Sensor Wire
|
|
| |
Purple
|
806
|
Cold start circuit (a fused supply wire from the starter solenoid circuit, page refers).
|
|
The following wires should be added to the harness going forward to the engine compartment as necessary if any of these systems are being utilised.
Table 8 - Optional Routings
|
ecm
|
colour
|
circuit number
|
description
|
remarks
|
|
c15
|
Dark Green
|
999
|
EGR Diagnostic temp switch
|
|
|
a3
|
Green/Yellow
|
428
|
canister purge control (CCP)
|
|
|
c3
|
Black/Pink
|
429
|
AIR Divert Solenoid (Air control valve)
|
|
|
a4
|
Gray
|
435
|
EGR control
|
|
|
a2
|
Brown
|
436
|
AIR Port Solenoid (air switch solonoid)
|
|
| |
Pink/Black
|
39
|
+12V supply to components controlled by circuits #428, 429, 439, 435, as necessary.
|
|
