Engine Control Module (ECM) X1 (LY2, LMG, LC9, LY5, LH6, L76, L20, L9H)

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Engine Control Module (ECM) X1 (LY2, LMG, LC9, LY5, LH6, L76 or L9H)

Courtesy of GENERAL MOTORS CORP.

Engine Control Module (ECM) X1 (LY2, LMG, LC9, LY5, LH6, L76 or L9H)

Pin	Wire	Circuit	Function
1	0.35 OG/BK	1786	Park/Neutral Signal
2	0.5 GY/BK	1694	4WD Low Signal (NQG)
3	0.5 TN/WH	1695	Axle Switch Signal (NQG)
4-8	-	-	Not Used
9	0.5 L-BU/WH	6311	Brake Switch Signal
10	0.5 PU/WH	1668	HO2S High Signal Bank 1 Sensor 2
11	0.5 TN/WH	1669	HO2S Low Signal Bank 1 Sensor 2
12	0.35 OG/BK	380	A/C Refrigerant Pressure Sensor Signal (CJ2 or C67)
13	0.35 TN	5514	Low Reference (CJ2 or C67)
14-15	-	-	Not Used
16	0.35 PU	1589	Fuel Level Sensor Signal - Primary
17	0.35 D-BU/WH	473	High Speed Cooling Fan Relay Control
18	0.5 D-BU	5985	Accessory Wakeup Serial Data
19	0.5 PK	439	Ignition 1 Voltage
20	0.5 RD/WH	440	Battery Positive Voltage
21-22	-	-	Not Used
23	0.35 PU	1272	Low Reference
24	0.35 D-GN	890	Fuel Tank Pressure Sensor Signal
25-26	-	-	Not Used
27	0.5 TN/BK	2501	High Speed GMLAN Serial Data Bus (-)
28	0.5 TN/BK	2500	High Speed GMLAN Serial Data Bus (+)
29	0.35 D-BU	1161	APP Sensor 1 Signal
30	0.35 BN	1271	Low Reference
31	0.35 TN/BK	6049	Low Reference
32	0.35 L-BU	1162	APP Sensor 2 Signal
33	0.35 GY	2709	5-Volt Reference 1
34	0.35 GY/WH	2700	5-Volt Reference 1
35	0.5 TN	2760	Low Reference
36	0.35 TN	1274	5-Volt Reference 1
37	0.5 TN/BK	472	IAT Sensor Signal
38	0.5 TN	2760	Low Reference
39-40	-	-	Not Used
41	0.5 YE	492	MAF Sensor Signal
42-46	-	-	Not Used
47	0.5 PK/BK	1339	Ignition 1 Voltage
48	-	-	Not Used
49	0.5 TN	1671	HO2S Low Signal Bank 2 Sensor 2
50	0.35 D-GN/WH	465	Fuel System Control Module Signal Fuel Pump Relay Control - Primary
51	-	-	Not Used
52	0.5 YE/BK	625	Starter Enable Relay Control
53-55	-	-	Not Used
56	0.35 WH/BK	1164	5-Volt Reference 2
57	-	-	Not Used
58	0.35 D-GN	335	Low Speed Cooling Fan Relay Control
59	0.35 YE	5991	Powertrain Relay Coil Control
60	-	-	Not Used
61	0.5 WH	1310	EVAP Canister Venst Solenoid Control
62	-	-	Not Used
63	0.35 D-GN/WH	459	A/C Compressor Clutch Relay Control (CJ2 or C67)
64	0.5 OG/WH	3223	HO2S Heater Low Control Bank 2 Sensor 2
65	0.5 GY/WH	3122	HO2S Heater Low Control Bank 1 Sensor 2
66-67	-	-	Not Used
68	0.35 BN/WH	419	MIL Control
69	0.5 PU	1670	HO2S High Signal Bank 2 Sensor 2
70	-	-	Not Used
71	0.35 OG/BK	6399	Replicated TOS Signal (except 31 Series without NQF or NQG)
71	0.5 PU/WH	821	Vehicle Speed Sensor (VSS) High Signal (MYC with NQG or NQH)
72	0.5 L-GN/BK	822	Vehicle Speed Sensor (VSS) Low Signal (MYC with NQG or NQH)
73	3 BK/WH	451	Ground

Connector Part Information

Harness: Engine
OEM: 13616079
Service: 88988931
Description: 73-Way F Receptacle 0.64 2.8 Series Sealed (BK)

Terminal Part Information

Pins: 1, 13, 24, 30, 32, 50, 57
Pins: 12, 16, 23, 29, 31, 33-34, 36, 56, 59, 63, 68, 70-71
Terminal/Tray: 33467-0003/23
Core/Insulation Crimp: H/H
Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)

Pins: 2-3, 9-10, 19-20, 37, 70, 72
Pins: 11, 18, 27-28, 38, 41, 47, 49, 52, 61, 64-65, 69, 71
Terminal/Tray: 33467-0005/23
Core/Insulation Crimp: J/J
Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)

Pins: 73
Terminal/Tray: 7116-4152-02/9
Core/Insulation Crimp: A/5
Release Tool/Test Probe: 12094430/J-35616-35 (VT)