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ECM Connector Identification

Table 11 - ECM Terminal Rows A and C
CIRCUIT
PIN
WIRE COLOUR
fuel pump relay control
a1
grn/wht
air switch (port)
a2
brn
canister purge control
a3
grn/yel
egr control
a4
gry
service engine soon
a5
brn/wht
ign
a6
pnk/blk
m/t overdrive or a/t tcc control
a7
tan/blk
serial data
a8
orn/wht
diag. term
a9
wht/blk
speed sensor sig.
a10
brn
analog gnd
   
maf 5v return
a11
blk/pnk
system gnd
a12
blk/wht
fan relay control
c1
dk grn/wht
(converter) air control
c2
blk/pnk
iac b low
c3
lt grn/blk
iac b hi
c4
lt grn/wht
iac a hi
c5
lt blu/wht
iac a lo
c6
lt blu/blk
a/t overdrive switch signal
c7
blk/blu
m/t o.d. request
c8
blk/blu
not used
c9
 
coolant temp sig.
c10
yel
not used
c11
 
mat signal
c12
tan
tps signal
c13
dk blu
tps 5 volt
c14
gry
egr diag switch
c15
dk grn
battery
c16
orn

Terminals a-7, c-7, c-8, b-6 are not used in all factory installations, so depending on which vehicle the harness came from, there may not be wires in these terminals. One combination of color codes is shown. Depending on the year/model there may be some differences.

Table 12 - ECM Terminal Rows B and D
Wire Color
Pin
Circuit
orn
b1
batt 12 volts
red
b2
fuel pump signal
blk/red
b3
est ref low
 
b4
not used
ppl/wht
b5
distributor ref.
wht
b6
vats
blk
b7
esc signal
grn/yel
b8
a/c signal off (on) 60
 
b9
not used
orn/blk
b10
park/neut. p/n sw. signal
 
b11
not used
dk. grn
b12
maf sensor (i/p)
blk/wht
d1
system gnd
blk
d2
tps,cts,mat 5v return
blk/wht
d3
system gnd
wht
d4
est control
tan/blk
d5
bypass
tan
d6
grnd (o2)
ppl
d7
02 sensor signal
 
d8
not used
blk/wht
d10
system gnd
dk grn
d11
a/c pressure fan switch
blk
d12
maf burn off relay cont.
 
d13
not used
 
d14
not used
lt blu
d15
inj. 1357
lt grn
d16
inj. 2,4,6,8

Figure 5 - ECM Connector

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