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