Engine Control Module (ECM) X1 (4.3L)

Fig 1: Engine Control Module (ECM) X1 (4.3L) Connector End View

Courtesy of GENERAL MOTORS CORP.

Pin	Wire	Circuit	Function
1	0.35 D-BU	1161	Accelerator Pedal Position (APP) Sensor 1 Signal
2	0.8 PU	1670	Heated Oxygen Sensor (HO2S) High Signal - Bank 2 Sensor 2
3	0.5 D-BU	5985	Accessory Wakeup Serial Data
4-5	-	-	Not Used
6	0.35 D-GN/WH	465	Fuel Pump Relay Control - Primary
7	-	-	Not Used
8	0.35 TN	5514	Low Reference (C60)
9	0.8 TN/WH	1669	Heated Oxygen Sensor (HO2S) Low Signal - Bank 1 Sensor X
10	0.8 TN	1671	Heated Oxygen Sensor (HO2S) Low Signal - Bank 2 Sensor 2
11-12	-	-	Not Used
13	0.5 YE	5991	Powertrain Relay Control
14	-	-	Not Used
15	0.8 GY/WH	3122	Heated Oxygen Sensor (HO2S) Heater Low Control - Bank 2 Sensor 1
16	0.8 OG/WH	3223	Heated Oxygen Sensor (HO2S) Heater Low Control - Bank 2 Sensor 2
17	0.8 PU/WH	1668	Heated Oxygen Sensor (HO2S) High Signal - Bank 1 Sensor X
18	0.35 L-BU	1162	Accelerator Pedal Position (APP) Sensor 2 Signal
19	0.5 PK	439	Ignition Voltage
20	0.5 RD/WH	440	Battery Positive Voltage
21	0.35 PU	1272	Low Reference
22-23	-	-	Not Used
24	0.5 TN	2759	Low Reference
25	0.35 OG/BK	380	A/C Refrigerant Pressure Sensor Signal (C60)
26	-	-	Not Used
27	0.35 BN/WH	419	MIL Control
28-29	-	-	Not Used
30	0.35 D-GN/WH	459	A/C Compressor Clutch Relay Control (C60)
31	-	-	Not Used
32	0.35 YE/BK	625	Starter Enable Relay Control
33-34	-	-	Not Used
35	0.5 TN	470	Low Reference
36	-	-	Not Used
37	0.5 YE	492	Mass Air Flow (MAF) Sensor Signal
38	-	-	Not Used
39	0.5 PU	1589	Fuel Level Sensor Signal - Primary
40	-	-	Not Used
41	0.35 BN	1271	Low Reference
42	0.5 D-GN	890	Fuel Tank Pressure Sensor Signal
43	0.5 TN/BK	2500	High Speed GMLAN Serial Data Bus (+)
44	0.5 TN	2501	High Speed GMLAN Serial Data Bus (-)
45-46	-	-	Not Used
47	0.35 WH/BK	1164	5-Volt Reference
48-49	-	-	Not Used
50	0.35 YE/BK	1827	Vehicle Speed Signal
51-53	-	-	Not Used
54	0.5 OG/BK	6399	Replicated TOS Signal
55	0.5 L-BU/WH	6311	Torque Converter Clutch (TCC) Brake Signal
56	-	-	Not Used
57	0.35 OG/BK	1786	Ignition Lock Cylinder Control Actuator Signal
58	0.5 TN	472	Intake Air Temperature (IAT) Sensor Signal
59-64	-	-	Not Used
65	0.35 GY	2700	5-Volt Reference (C60)
66	0.5 GY	2709	5-Volt Reference
67	0.35 TN	1274	5-Volt Reference
68-69	-	-	Not Used
70	0.5 WH	1310	Evaporative Emission (EVAP) Canister Vent Solenoid Control
71-72	-	-	Not Used
73	0.5 PK	1339	Ignition Voltage

Connector Part Information

OEM: 15499466
Service: 88988931
Description: 73-Way F MX123 Series, Sealed (BK)

Terminal Part Information

Pins: 73
Terminal/Tray: 7116-4150-02/9
Core/Insulation Crimp: E/1
Release Tool/Test Probe: 12094430/J-35616-4A (PU)

Pins: 1, 6, 8, 18, 21, 25, 27, 30, 32, 41, 47, 50, 57, 65, 67
Terminal/Tray: 33467-0003/23
Core/Insulation Crimp: H/H
Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)

Pins: 2, 9, 10, 15-17, 3, 13, 19, 20, 24, 35, 37, 39, 42-44, 54, 55, 58, 66, 70
Terminal/Tray: 33467-0005/23
Core/Insulation Crimp: Pins 2, 9, 10, 15-17 - K/K
Core/Insulation Crimp: Pins 3, 13, 19, 20, 24, 35, 37, 39, 42, 43, 44, 54, 55, 58, 66, 70 - J/J
Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)