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Engine Control Module (ECM) X2 (LS4)

Fig 1: Engine Control Module (ECM) X2 (LS4) Connector End View
GM1590596Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) X2 (LS4)

Pin Wire Circuit Function
1 0.5 PU 2121 IC 1 Control
2 0.5 TN 1664 HO2S Low Signal Sensor 1
3 0.5 PU/WH 1665 HO2S High Signal Sensor 1
4 0.5 PU/WH 1668 HO2S High Signal Sensor 2
5 0.5 TN/WH 1669 HO2S Low Signal Sensor 2
6 0.35 L-BU 1876 KS 2 Signal
7 0.35 GY 2303 KS 2 Signal
8 0.35 D-BU 496 KS 1 Signal
9 0.35 GY 1716 KS 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 TN 2752 Low Reference
30-31 - - Not Used
32 0.5 L-GN/BK 1745 Fuel Injector 2 Control
33 0.5 OG 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 OG 631 5-Volt Reference 1
40 0.35 GY 2705 5-Volt Reference 1
41 - - Not Used
42 0.35 TN 2760 Low Reference
43 0.35 L-GN 1867 5-Volt Reference 2
44 0.35 GY 2701 5-Volt Reference 2
45-47 - - Not Used
48 0.5 D-BU/WH 878 Fuel Injector 8 Control
49 0.5 TN/WH 845 Fuel Injector 5 Control
50-51 - - Not Used
52 0.5 YE/BK 846 Fuel Injector 6 Control
53 0.5 OG/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 Sensor Signal
61 - - Not Used
62 0.35 TN/BK 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 GY/WH 3113 HO2S Heater Low Control Sensor 1
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 OG/BK 877 Fuel Injector 7 Control
72 0.5 TN 1744 Fuel Injector 1 Control
73 2 BK/WH 451 Ground
Connector Part Information 
  • OEM: 13574286
  • Service: See Catalog
  • Description: 73-Way F 0.64 2.8 Series, Sealed (BK)
Terminal Part Information 
  • Pins: 2-72
  • Terminal/Tray: 15359541/4
  • Core/Insulation Crimp: M/M
  • Release Tool/Test Probe: 15381651-2/J-35616-64B (L-BU)
  • Pins: 73
  • Terminal/Tray: 15304720/19
  • Core/Insulation Crimp: 4/5
  • Release Tool/Test Probe: 15315247/J-35616-4A (PU)
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