Engine Control Module (ECM) X2 (HV-240) (L79)

Fig 1: Engine Control Module (ECM) X2 Connector End View

Courtesy of GENERAL MOTORS CORP.

Engine Control Module (ECM) X2 Connector Terminal Identification (HV-240) (L79)

Pin	Wire	Circuit	Function
1	0.5 PU/WH	632	Low Reference
2	0.5 OG	440	Battery Positive Voltage
3	0.5 PK/D-BU	539	Ignition 1 Voltage
4-6	-	-	Not Used
7	0.5 L-BU	380	A/C Refrigerant Pressure (ACP) Sensor Signal
8	0.5 L-BU	722	Octane Switch Signal
9	0.5 GY	121	Engine Speed Signal
10	0.5 D-GN/WH	762	A/C Request Signal
11	-	-	Not Used
12	0.5 D-BU	473	High Speed Cooling Fan Relay Control
13	WH/BK	-	Intake Manifold Tuning Valve Solenoid Control
14	0.5 PU	1807	CAN Serial Data High
15	0.5 PU	2000	Keyword Serial Data
16	-	-	Not Used
17	0.5 GY	605	5-Volt Reference
18	0.5 OG	440	Battery Positive Voltage
19	0.5 GY	1936	Fuel Gage
20-21	-	-	Not Used
22	0.5 PU	723	Octane Switch Signal
23	0.5 D-GN/WH	817	Vehicle Speed Signal (Manual Transmission)
24	0.5 D-GN	135	Engine Coolant (ECT) Sensor Gage Signal
25	-	-	Not Used
26	0.5 D-GN/WH	465	Fuel Pump Relay Control
27	0.5 D-GN/WH	335	Low Speed Cooling Fan Relay Control
28	0.5 D-GN	67	A/C Compressor Clutch Coil Supply Voltage
29	-	-	Not Used
30	0.5 YE	710	CAN Serial Data Low
31	0.5 WH	30	Fuel Level Sensor Signal
32	0.5 BN/WH	419	Malfunction Indicator Lamp (MIL) Control

Connector Part Information