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Engine Control Module (ECM) X2 (LS4)

Fig 1: Engine Control Module (ECM) X2 (LS4) Connector End View
GM1673472Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) X2 (LS4)

Pin Wire Color Circuit No. Function
1 0.5 PU 2121 IC 1 Control
2 0.5 TN 1664 HO2S Low Signal
3 0.5 PU/WH 1665 HO2S High Signal
4 0.5 PU/WH 1668 HO2S High Signal
5 0.5 TN/WH 1669 HO2S Low Signal
6 0.35 L-BU 1876 Knock Sensor 2 Signal
7 0.35 GY 2303 Knock Sensor 2 Signal
8 0.35 D-BU 496 Knock Sensor 1 Signal
9 0.35 GY 1716 Knock Sensor 1 Signal
10 - - Not Used
11 0.5 YE 581 TAC Motor Control 1
12 0.5 BN 582 TAC Motor Control 2
13 0.5 PK/BK 5290 Ignition 1 Voltage
14-15 - - Not Used
16 0.5 PK/BK 1746 Fuel Injector 3 Control
17 0.5 PU/WH 2128 IC 8 Control
18 0.5 D-GN/WH 2124 IC 4 Control
19 0.5 BN/WH 2130 Low Reference
20-22 - - Not Used
23 0.35 PK/BK 632 Low Reference
24 0.35 BK 2755 Low Reference
25-26 - - Not Used
27 0.35 YE/BK 1868 Low Reference
28 - - Not Used
29 0.35 BK/WH 1704 Low Reference
30-31 - - Not Used
32 0.5 L-GN/BK 1745 Fuel Injector 2 Control
33 0.5 RD 2127 IC 7 Control
34 0.5 D-GN 2125 IC 5 Control
35 0.5 BN 2129 Low Reference
36-38 - - Not Used
39 0.35 RD 631 12-Volt Reference
40 0.35 GY 2705 5-Volt Reference 1
41 - - Not Used
42 0.35 BK 2760 Low Reference
43 0.35 L-GN 1867 12-Volt Reference
44 0.35 L-BU/BK 1688 5-Volt Reference 2
45-47 - - Not Used
48 0.5 D-BU/WH 878 Fuel Injector 8 Control
49 0.5 BK/WH 845 Fuel Injector 5 Control
50-51 - - Not Used
52 0.5 YE/BK 846 Fuel Injector 6 Control
53 0.5 RD/WH 2122 IC 2 Control
54 0.5 L-BU/WH 2126 IC 6 Control
55 0.5 L-BU 2123 IC 3 Control
56-58 - - Not Used
59 0.35 BN/WH 633 CMP Sensor Signal
60 0.35 TN/WH 331 Oil Pressure Switch Signal
61 - - Not Used
62 0.35 TN 472 IAT Sensor Signal
63 0.35 D-BU/WH 1869 CKP Sensor Signal
64 0.35 D-GN 485 TP Sensor 1 Signal
65 - - Not Used
66 0.35 PU 486 TP Sensor 2 Signal
67 0.35 YE 492 MAF Sensor Signal
68 0.5 BK/WH 3113 HO2S Heater Low Control Sensor
69 0.5 BN 2391 HO2S Heater Low Control - Sensor 2
70 0.5 L-BU/BK 844 Fuel Injector 4 Control
71 0.5 RD/BK 877 Fuel Injector 7 Control
72 0.5 BK 1744 Fuel Injector 1 Control
73 2 BK/WH 451 Ground
Connector Part Information 
  • OEM: 13574286
  • Service: See Catalog
  • Description: 73-Way F MX123 34566 Series (BK)
Terminal Part Information 
  • Pins: 1-9, 11-13, 16-19, 23, 24, 27, 29, 32-35, 39, 40, 42-44, 48, 49, 52-55, 59, 60, 62-64, 66-73
  • Terminal/Tray: See Terminal Repair Kit
  • Core/Insulation Crimp: See Terminal Repair Kit
  • Release Tool/Test Probe: See Terminal Repair Kit
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