Engine Control Module Connector End Views

Engine Control Module (ECM) A (HV-240)

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		PED 12129231 32-Way Retainer Lock (GY)
Pin	Wire Color	Circuit Number	Function
1	BK/WH	51	Ground
2	BK/WH	51	Ground
3	YE/BK	496	Knock Sensor Signal
4	D-GN	411	Exhaust Gas Recirculation (EGR) Valve Control
5	-	-	Not Used
6	YE/BK	1868	Low Reference
7	D-BU	417	Throttle Position (TP) Sensor Signal
8	PK/BK	1746	Fuel Injector 3 Control
9	BK	1744	Fuel Injector 1 Control
10	BK/WH	252	Low Reference
11	YE	410	Engine Coolant Temperature (ECT) Sensor Signal
12	D-GN/RD	1665	Oxygen (O2) Sensor 1 Low Reference (Unleaded Only)
13	PU/WH	1749	Idle Air Control (IAC) Coil B High Control
14	-	-	Not Used
15	GY	416	5-Volt Reference
16	OG/BK	469	Low Reference
17	BK/WH	51	Ground
18	L-BU	406	Ignition Coil (IC) 1 and 4 Control
19	D-GN/WH	423	Ignition Coil (IC) 2 and 3 Control
20	D-GN/WH	428	Evaporative Emissions (EVAP) Canister Purge Solenoid Control
21	D-BU/WH	1869	Crankshaft Position (CKP) Sensor Signal
22	L-GN/BK	1745	Fuel Injector 2 Control
23	BN	472	Intake Air Temperature (IAT) Sensor 5-Volt Reference
24	L-GN	432	Manifold Absolute Pressure (MAP) Sensor Signal
25	BN/WH	633	Camshaft Position (CMP) Sensor Signal
26	L-BU/BK	844	Fuel Injector 4 Control
27	GY	1653	Oxygen (O2) Sensor 1 Signal (Unleaded Only)
28	BN	1747	Idle Air Control (IAC) Coil A High Control
29	WH	444	Idle Air Control (IAC) B Low Control
30	YE/WH	1748	Idle Air Control (IAC) A Low Control
31	L-BU/BK	1688	5-Volt Reference Voltage
32	BK/YE	808	Low Reference

Engine Control Module (ECM) B (HV-240)

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		PED 12129232 32-Way Retainer Lock (WH)
Pin	Wire Color	Circuit Number	Function
1	PU/WH	632	Low Reference
2	OG	440	Battery Positive Voltage
3	PK/D-BU	539	Ignition 1 Voltage
4-6	-	-	Not Used
7	L-BU	380	A/C Refrigerant Pressure (ACP) Sensor Signal
8	L-BU	722	Octane Switch Signal
9	GY	121	Engine Speed Signal
10	D-GN/WH	762	A/C Request Signal
11	-	-	Not Used
12	D-BU	473	High Speed Cooling Fan Relay Control
13	WH/BK	-	Intake Manifold Tuning Valve Solenoid Control
14	PU	1807	CAN Serial Data High
15	PU	2000	Keyword Serial Data
16	-	-	Not Used
17	GY	605	5-Volt Reference
18	OG	440	Battery Positive Voltage
19	GY	1936	Fuel Gage
20-21	-	-	Not Used
22	PU	723	Octane Switch Signal
23	D-GN/WH	817	Vehicle Speed Signal (Manual Transmission)
24	D-GN	135	Engine Coolant (ECT) Sensor Gage Signal
25	-	-	Not Used
26	D-GN/WH	465	Fuel Pump Relay Control
27	D-GN/WH	335	Low Speed Cooling Fan Relay Control
28	D-GN	67	A/C Compressor Clutch Coil Supply Voltage
29	-	-	Not Used
30	YE	710	CAN Serial Data Low
31	WH	30	Fuel Level Sensor Signal
32	BN/WH	419	Malfunction Indicator Lamp (MIL) Control