Engine Control Module (ECM) X1

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

Courtesy of GENERAL MOTORS CORP.

Connector Part Information  OEM: 13587097 (4.2L)/13574282 (5.3L) Service: 88988373 Description: 56-Way F 0.64 Series Sealed (BU)

Terminal Part Information  Pins: 1, 2, 4, 9, 12, 13, 16, 18, 20-22, 25, 30-37, 39-40, 44, 46-49, 53, 55, 56 Terminal/Tray: 33467-0003/23 Core/Insulation Crimp: H/H Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU) Pins: 7, 19, 51 Terminal/Tray: 33467-0005/23 Core/Insulation Crimp: J/J Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)

Pin	Wire	Circuit	Function
1	0.35 PU	806	Crank Voltage
2	0.35 PU	420	TCC Brake Switch/Cruise Control Release Signal
3	-	-	Not Available
4	0.35 GY/BK	1694	4WD Low Signal (NP8)
5-6	-	-	Not Available
7	0.35 L-BU	1320	CHMSL Control (K34)
8	-	-	Not Available
9	0.35 BK	2759	Low Reference
10-11	-	-	Not Available
12	0.35 BN/WH	419	MIL Control
13	0.35 D-GN/WH	465	Fuel Pump Relay Control
14	-	-	Not Available
15	-	-	Not Used (4.2L)
	-	-	Not Available (5.3L)
16	0.35 D-GN	1049	Class 2 Serial Data
17	-	-	Not Available
18	0.35 PK	1020	Ignition Voltage
19	0.35 PK	439	Ignition Voltage
20	0.35 OG	240	Battery Positive Voltage
21	0.35 GY/BK	87	Cruise Control Resume/Accel Switch Signal (K34)
22	0.35 D-BU	84	Cruise Control Set/Coast Switch Signal (K34)
23	-	-	Not Available
24	-	-	Not Used (4.2L)
	-	-	Not Available (5.3L)
25	0.35 WH	121	Engine Speed Signal
26-29	-	-	Not Available
30	0.35 GY	397	Cruise Control On Switch Signal (K34)
31	-	-	Not Available (4.2L)
	0.35 BK	452	Low Reference (5.3L)
32	-	-	Not Available (4.2L)
	0.35 GY	416	5-Volt Reference (5.3L)
33	0.35 WH/BK	1164	5-Volt Reference
34	0.35 GY	2709	5-Volt Reference
35	0.35 TN	1274	5-Volt Reference
36	0.35 BN	1271	Low Reference
37	0.35 PU	1272	Low Reference
38	-	-	Not Available
39	0.35 D-GN/WH	817	Vehicle Speed Signal
40	0.35 YE	5991	Powertrain Relay Coil Control
41-43	-	-	Not Available
44	0.35 PU	1589	Fuel Level Sensor Signal
45	-	-	Not Available
46	-	-	Not Available (4.2L)
	0.35 D-BU	1809	Brake Booster Vacuum Sensor (5.3L)
47	0.35 D-BU	1161	APP Sensor 1 Signal
48	0.35 D-GN	890	Fuel Tank Pressure Sensor
49	0.35 L-BU	1162	App Sensor 2 Signal
50	-	-	Not Available
51	0.5 PK/BK	429	Air Injection Reaction Solenoid Relay Coil Control (4.2L)
52	-	-	Not Available
53	0.35 D-GN/WH	459	A/C Compressor Clutch Relay Control
54	-	-	Not Available
55	0.35 WH	1310	EVAP Canister Vent Solenoid Control
56	0.35 YE/BK	625	Starter Enable Relay Control