Engine Control Module (ECM) X3 Connector End View

WARNING: This page is about a different car, the 2011 GMC Canyon and 2011 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Engine Control Module (ECM) X3 Connector End View

Courtesy of GENERAL MOTORS CORP.

Engine Control Module (ECM) X3

Pin	Wire	Circuit	Function
1-2	-	-	Not Available
3	0.5 TN	1667	HO2S Low Signal - Bank 2 Sensor 1 (LH9)
3	-	-	Not Available (LLR or LLV)
4	0.5 PU	1666	HO2S High Signal - Bank 2 Sensor 1 (LH9)
4	-	-	Not Available (LLR or LLV)
5	0.5 PU	1670	HO2S High Signal - Bank 2 Sensor 2 (LH9)
5	-	-	Not Available (LLR or LLV)
6	0.5 TN	1671	HO2S Low Signal - Bank 2 Sensor 2 (LH9)
6	-	-	Not Available (LLR or LLV)
7	0.5 PU	5428	Generator Regulator Control
8	-	-	Not Available
9	0.5 BN	436	AIR Relay Control (K18)
9	-	-	Not Available (LH9)
10-11	-	-	Not Available
12	0.5 TN/BK	464	Delivered Torque Signal
13-14	-	-	Not Available
15	0.5 L-GN	3212	HO2S Heater Low Control - Bank 2 Sensor 1 (LH9)
15	-	-	Not Available (LLR or LLV)
16	-	-	Not Available
17	0.5 OG/BK	463	Requested Torque Signal
18-20	-	-	Not Available
21	0.5 BK	2751	Low Reference
22	-	-	Not Available
23	0.5 OG/BK	469	Low Reference
24-25	-	-	Not Available
26	0.5 D-BU/WH	6785	Low Reference (K18)
26	-	-	Not Available (LH9)
27	0.5 D-GN/WH	6294	Low Reference (MA5)
27	-	-	Not Available (M30)
28	-	-	Not Available
29	0.5 GY	23	Generator Field Duty Cycle Signal
30-32	-	-	Not Available
33	0.5 TN	2501	High Speed GMLAN Serial Data Bus -
34	-	-	Not Available
35	0.5 BK	2761	Low Reference (LH9)
35	0.35 BK	2761	Low Reference (LLR or LLV)
36	-	-	Not Available
37	0.5 GY	2700	5-Volt Reference
38	-	-	Not Available
39	0.5 GY	2704	5-Volt Reference
40-41	-	-	Not Available
42	0.5 BN/WH	6789	5-Volt Reference (K18)
43	0.5 D-GN	6293	5-Volt Reference (MA5)
43	-	-	Not Available (M30)
44-45	-	-	Not Available
46	0.35 OG/BK	1786	Park/Neutral Signal (M30)
46	-	-	Not Available (MA5)
47	-	-	Not Available
48	0.5 D-GN/WH	428	EVAP Canister Purge Solenoid Control
49	-	-	Not Available
50	0.5 RD/WH	3223	HO2S Heater Low Control - Bank 2 Sensor 2 (LH9)
50	-	-	Not Available (LLR or LLV)
51-52	-	-	Not Available
53	0.5 TN/WH	2500	High Speed GMLAN Serial Data Bus +
54	-	-	Not Available
55	0.5 YE	410	ECT Sensor Signal
56	-	-	Not Available
57	0.5 OG/BK	380	A/C Refrigerant Pressure Sensor Signal (LH9)
57	0.35 OG/BK	380	A/C Refrigerant Pressure Sensor Signal (LLR or LLV)
58	-	-	Not Available
59	0.5 L-GN	432	MAP Sensor Signal
60-61	-	-	Not Available
62	0.5 YE	6787	Air Injection Reaction Control Valve Control (K18)
62	-	-	Not Available (LH9)
63	0.5 D-BU	6306	Clutch Pedal Position Signal (MA5)
63	-	-	Not Available (M30)
64	-	-	Not Available
65	0.35 TN/BK	231	Oil Pressure Switch Signal (LLR or LLV)
65	-	-	Not Available (LH9)
66	0.5 PU/WH	821	VSS High Signal (MA5)
66	-	-	Not Available (M30)
67	0.5 L-GN/BK	822	VSS Low Signal (MA5)
67	-	-	Not Available (M30)
68-72	-	-	Not Available
73	-	-	Not Used

Connector Part Information

Harness: Engine
OEM: 13675624 (LH9)
OEM: 13600012 (LLR or LLV with M30)
OEM: 13597590 (MA5)
Service: 88988372
Description: 73-Way F MX123 34566 Series Sealed (GY) with (BK) Case

Terminal Part Information

Pins: 3-7, 9, 12, 15, 17, 21, 23, 26, 27, 29, 33, 35(LH9), 37, 39, 42, 43, 48, 50, 53, 55, 57(LH9), 59, 62, 63, 66, 67
Terminal/Tray: 33467-0005/23
Core/Insulation Crimp: J/J
Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)

Pins: 35(LLR or LLV), 46, 57(LLR or LLV), 65
Terminal/Tray: 33467-0003/23
Core/insulation Crimp: H/H
Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)