Powertrain Control Module (PCM) Connectors

WARNING: This page is about a different car, the 2004 GMC Yukon XL, 2004 Chevrolet Suburban, and 2004 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Powertrain Control Module (PCM) - C1

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12191489 80-Way F Micro-Pack 100W Sealed (BLU)
Pin	Wire Color	Circuit No.	Function
1	BLK/WHT	451	Ground
2	LT GRN	1867	12-Volt Reference
3	PNK/BLK	1746	Fuel Injector 3 Control
4	LT GRN/BLK	1745	Fuel Injector 2 Control
5-6	-	-	Not Used
7	GRY	2705	5-Volt Reference
8-10	-	-	Not Used
11	LT BLU	1876	Knock Sensor 2 Signal
12	DK BLU/ WHT	1869	CKP Sensor Signal
13	ORN/BLK	463	Requested Torque Signal
14	ORN/BLK	1061	UART Serial Data
15	DK BLU/ WHT	774	UART Serial Data
16-17	-	-	Not Used
18	DK GRN	1433	Clutch Start Switch Signal (M/T)
19	PNK	439	Ignition 1 Voltage
20	ORN	440	Battery Positive Voltage
21	YEL/BLK	1868	Low Reference
22	LT GRN	488	PTO Enable Switch (w/PTO)
23	BLK	470	Low Reference
24	BLK/WHT	451	Ground
25	TAN	1671	HO2S Low Signal Bank 2 Sensor 2 (w/NC1)
26	TAN	1677	HO2S Low Signal Bank 2 Sensor 1
27	BLK/WHT	451	Ground
28	TAN	1669	HO2S Low Signal Bank 1 Sensor 2 (w/NC1)
29	TAN	1664	HO2S Low Signal Bank 1 Sensor 1
30	LT GRN	1478	Coolant Level Switch Signal
31-32	-	-	Not Used
33	PPL	420	TCC Brake Switch/Cruise Control Release Signal
34	ORN/BLK	1786	Park/Neutral Signal (Allison Transmission Only)
35	GRY	48	CPP Switch Signal (M/T)
36	BLK	1744	Fuel Injector 1 Control
37	YEL/BLK	846	Fuel Injector 6 Control
38	-	-	Not Used
39	YEL/BLK	625	Starter Enable Relay Control
40	BLK/WHT	451	Ground
41	PPL	719	Low Reference
42	-	-	Not Used
43	RED/BLK	877	Fuel Injector 7 Control
44	LT BLU/BLK	844	Fuel Injector 4 Control
45	GRY	2700	5-Volt Reference
46	GRY	474	5-Volt Reference
47	GRY	596	5-Volt Reference
48	GRY	597	5-Volt Reference
49-50	-	-	Not Used
51	DK BLU	496	Knock Sensor 1 Signal
52	YEL	2522	PTO Status (w/PTO)
53	-	-	Not Used
54	ORN/BLK	469	Low Reference
55	BRN	1456	EGR Valve Position Signal
56	-	-	Not Used
57	ORN	440	Battery Positive Voltage
58	DK GRN	1049	PCM Class 2 Serial Data
59	YEL	710	Class 2 Serial Data
60	-	-	Not Used
61	PNK/BLK	632	Low Reference
62	-	-	Not Used
63	BLK	2755	Low Reference
64	BLK/WHT	451	Ground
65	PPL	1670	HO2S High Signal Bank 2 Sensor 2 (w/NC1)
66	PPL	1666	HO2S High Signal Bank 2 Sensor 1
67	BLK/WHT	451	Ground
68	PPL/WHT	1668	HO2S High Signal Bank 1 Sensor 2 (w/NC1)
69	PPL/WHT	1665	HO2S High Signal Bank 1 Sensor 1
70	BRN	1174	Oil Level Switch Signal
71	LT BLU	494	PTO Engine Kill (w/PTO)
72	-	-	Not Used
73	BRN/WHT	633	CMP Sensor Signal
74	YEL	410	ECT Sensor Signal
75	PNK	1020	Off/Run/Crank Voltage
76	BLK/WHT	845	Fuel Injector 5 Control
77	DK BLU/ WHT	878	Fuel Injector 8 Control
78	PPL	2562	PTO Engage (w/PTO)
79	-	-	Not Used
80	BLK	407	Low Reference

Powertrain Control Module (PCM) - C2

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12191488 80-Way F Micro-Pack 100W Sealed (RED)
Pin	Wire Color	Circuit No.	Function
1	BLK/WHT	451	Ground
2	WHT	2467	Torque Response Reply Signal (Allison Trans Only)
3	TAN	1465	Fuel Pump Relay Control - Secondary
4	-	-	Not Used
5	TAN/BLK	464	Delivered Torque Signal (Allison Trans Only)
6	-	-	Not Used
7	RED	1676	EGR Valve Supply Voltage
8	-	-	Not Used
9	DK GRN/ WHT	465	Fuel Pump Relay Control
10	WHT	121	Engine Speed Signal
11	-	-	Not Used
12	DK BLU	2466	Trans MIL Request Signal (Allison Trans Only)
13	-	-	Not Used
14	RED/BLK	380	A/C Refrigerant Pressure Sensor Signal
15	BRN	25	Charge Indicator Control
16	GRY/BLK	1694	4WD Low Signal (w/4WD)
17-18	-	-	Not Used
19	BLK/WHT	1695	Axle Switch Signal (w/NP2)
20	LT GRN/BLK	822	VSS Low Signal
21	PPL/WHT	821	VSS High Signal (Except Allison Transmission
21	YEL	400	Signal High - Front (Allison Trans Only)
22-24	-	-	Not Used
25	TAN	472	IAT Sensor Signal
26	PPL	2121	IC 1 Control
27	RED	2127	IC 7 Control
28	LT BLU/WHT	2126	IC 6 Control
29	DK GRN/ WHT	2124	IC 4 Control
30	-	-	Not Used
31	YEL	492	MAF Sensor Signal
32	LT GRN	432	MAP Sensor Signal
33	-	-	Not Used
34	DK GRN/ WHT	428	EVAP Canister Purge Solenoid Control
35-38	-	-	Not Used
39	RED	631	12-Volt Reference
40	BLK/WHT	451	Ground
41	WHT	257	EGR Solenoid Control
42	-	-	Not Used
43	DK GRN/ WHT	459	A/C Compressor Clutch Relay Control
44	-	-	Not Used
45	WHT	1310	EVAP Canister Vent Solenoid Control
46	BRN/WHT	419	MIL Control
47-48	-	-	Not Used
49	YEL/BLK	1827	Vehicle Speed Signal
50	DK GRN/ WHT	817	Vehicle Speed Signal
51	-	-	Not Used
52	BRN	2391	HO2S Heater Low Control Bank 1 Sensor 2 (W/NC1)
53	RED/WHT	3223	HO2S Heater Low Control Bank 2 Sensor 2 (W/NC1)
54	PPL	1589	Fuel Level Sensor Signal
55-56	-	-	Not Used
57	BLK	552	Low Reference
58	TAN/WHT	332	Oil Pressure Sensor Signal
59	PPL	806	Crank Voltage
60	BRN	2129	Low Reference
61	BRN/WHT	2130	Low Reference
62-63	-	-	Not Used
64	DK GRN	890	Fuel Tank Pressure Sensor Signal
65	-	-	Not Used
66	PPL/WHT	2128	IC 8 Control
67	RED/WHT	2122	IC 2 Control
68	DK GRN	2125	IC 5 Control
69	LT BLU	2123	IC 3 Control
70-71	-	-	Not Used
72	BLK/WHT	3122	HO2S Heater Low Control Bank 1 Sensor 2 (w/NC1)
73	DK BLU	1936	Fuel Level Sensor Signal - Secondary
74	LT GRN/WHT	3213	HO2S Heater Low Control Bank 2 Sensor 1
75-79	-	-	Not Used
80	BLK	2751	Low Reference