Hummer H1 (2006+). Manual — part 394
12-252
Electrical System
______________________________________________________
C76/ 72 WAY ECM J2 (BLACK) LOCATION: DRIVERSIDE COWL TOP UNDER ECM
PIN
CKT
COLOR
DESCRIPTION
1
2
507
OR/BK
Fuel rail pressure signal
3
--
--
--
4
--
--
--
5
232
BR
CAN shield
6
--
--
--
7
784
DB
T-case range switch input to the ECM (-)
8
107
BK
EGR stepper motor
9
--
--
--
10
--
--
--
11
--
--
--
12
--
--
--
13
--
--
--
14
624
GY
Coolant temperature sensor
15
--
--
--
16
--
--
--
17
--
--
--
18
--
--
--
19
718
DB
APP sensor 1 signal
20
--
--
--
21
661
GN
Transmission control module MIL request
22
--
--
--
23
615
LG
MAP sensor signal
24
724
DG
APP sensor 3 signal
25
619
TN/WH
Oil pressure sensor signal
_____________________________________________________
Electrical System 12-253
26
27
324
YL
Fuel temperature sensor signal
28
257
LG
Crank shaft sensor signal
29
251
BK
MAF sensor ground
30
616
OR/BK
MAP
31
368
WH
VNT valve position
32
--
--
--
33
108
OR/BK
EGR valve high control
34
244
BK
Ground
35
109
LG/BK
EGR valve low control
36
244
BK
Ground
37
--
--
--
38
--
--
--
39
618
BK
Engine oil pressure
40
719
BR
APP 1
41
--
--
--
42
509
YL
Fuel pressure regulator sensor signal
43
--
--
--
44
369
BR
VNT position sensor
45
46
613
GY/BK
Baro sensor signal
47
--
--
--
48
--
--
--
49
362
DB
Turbocharger vane position control solenoid valve high
50
363
WH
Turbocharger vane position control solenoid valve low
51
--
--
--
52
632
PK/BK
Injector 3 request
53
110
OR/BK
EGR valve, high control
54
722
PP
APP 2
55
111
LG/BK
EGR valve, low control
56
725
GY
APP 3
PIN
CKT
COLOR
DESCRIPTION
12-254
Electrical System
______________________________________________________
C77/ 56 WAY ECM (GRAY) LOCATION: DRIVERSIDE COWL TOP UNDER ECM
PIN
CKT
COLOR
DESCRIPTION
1
--
--
--
2
--
--
--
3
--
--
--
4
--
--
--
5
--
--
--
6
--
--
--
7
--
--
--
8
243
PK
+12v Ignition input
9
--
--
--
10
514
PK
Ignition 1 Voltage
11
--
--
--
12
497
YL
Vehicle speed sensor high
13
--
--
--
14
514
PK
Ignition 1 Voltage
15
--
--
--
16
--
--
--
17
--
--
--
18
331
WH
Crank request
19
152
DB
Cruise control SET/COAST switch signal
20
439
YL
A\C request
21
--
--
--
22
153
LG
Cruise RESUME\ACCELERATE
23
498
DG
Vehicle speed sensor low
24
653
YL
Intake air temperature signal
25
--
--
--
26
--
--
--
_____________________________________________________
Electrical System 12-255
27
--
--
--
28
714
DB
Check throttle lamp activation
29
30
151
GY
Cruise control “ON” switch signal
31
330
PP
PRNDL switch
32
--
--
--
33
--
--
--
34
--
--
--
35
332
BK
Starter relay
36
--
--
--
37
644
YL
Tach signal
38
--
--
--
39
--
--
--
40
658
BR
Malfunction indicator lamp
41
410
LG
A\C clutch relay
42
43
258
YL/BK
Crank sensor
44
244
BK
Ground
45
140
OR
Transmission reverse switch
46
--
--
--
47
--
--
--
48
252
BR
Fuel temperature sensor
49
--
--
--
50
--
--
--
51
253
BR/WH
Cam sensor signal
52
266
DB/WH
Crank sensor signal
53
--
--
--
54
--
--
--
55
--
--
--
56
--
--
--
PIN
CKT
COLOR
DESCRIPTION
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