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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.
 


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